[PATCH v3 1/3] drm/format-helper: Add conversion from XRGB8888 to BGR888

[PATCH v3 1/3] drm/format-helper: Add conversion from XRGB8888 to BGR888

[Aditya Garg]

From: Kerem Karabay <kekrby@gmail.com>

Add XRGB8888 emulation helper for devices that only support BGR888.

Signed-off-by: Kerem Karabay <kekrby@gmail.com>
Signed-off-by: Aditya Garg <gargaditya08@live.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
---
v2 -> Fix incorrect description
v3 -> No change in this patch
 drivers/gpu/drm/drm_format_helper.c           | 54 +++++++++++++
 .../gpu/drm/tests/drm_format_helper_test.c    | 81 +++++++++++++++++++
 include/drm/drm_format_helper.h               |  3 +
 3 files changed, 138 insertions(+)

diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c
index b1be458ed..4f60c8d8f 100644
--- a/drivers/gpu/drm/drm_format_helper.c
+++ b/drivers/gpu/drm/drm_format_helper.c
@@ -702,6 +702,57 @@ void drm_fb_xrgb8888_to_rgb888(struct iosys_map *dst, const unsigned int *dst_pi
 }
 EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb888);
 
+static void drm_fb_xrgb8888_to_bgr888_line(void *dbuf, const void *sbuf, unsigned int pixels)
+{
+	u8 *dbuf8 = dbuf;
+	const __le32 *sbuf32 = sbuf;
+	unsigned int x;
+	u32 pix;
+
+	for (x = 0; x < pixels; x++) {
+		pix = le32_to_cpu(sbuf32[x]);
+		/* write red-green-blue to output in little endianness */
+		*dbuf8++ = (pix & 0x00ff0000) >> 16;
+		*dbuf8++ = (pix & 0x0000ff00) >> 8;
+		*dbuf8++ = (pix & 0x000000ff) >> 0;
+	}
+}
+
+/**
+ * drm_fb_xrgb8888_to_bgr888 - Convert XRGB8888 to BGR888 clip buffer
+ * @dst: Array of BGR888 destination buffers
+ * @dst_pitch: Array of numbers of bytes between the start of two consecutive scanlines
+ *             within @dst; can be NULL if scanlines are stored next to each other.
+ * @src: Array of XRGB8888 source buffers
+ * @fb: DRM framebuffer
+ * @clip: Clip rectangle area to copy
+ * @state: Transform and conversion state
+ *
+ * This function copies parts of a framebuffer to display memory and converts the
+ * color format during the process. Destination and framebuffer formats must match. The
+ * parameters @dst, @dst_pitch and @src refer to arrays. Each array must have at
+ * least as many entries as there are planes in @fb's format. Each entry stores the
+ * value for the format's respective color plane at the same index.
+ *
+ * This function does not apply clipping on @dst (i.e. the destination is at the
+ * top-left corner).
+ *
+ * Drivers can use this function for BGR888 devices that don't natively
+ * support XRGB8888.
+ */
+void drm_fb_xrgb8888_to_bgr888(struct iosys_map *dst, const unsigned int *dst_pitch,
+			       const struct iosys_map *src, const struct drm_framebuffer *fb,
+			       const struct drm_rect *clip, struct drm_format_conv_state *state)
+{
+	static const u8 dst_pixsize[DRM_FORMAT_MAX_PLANES] = {
+		3,
+	};
+
+	drm_fb_xfrm(dst, dst_pitch, dst_pixsize, src, fb, clip, false, state,
+		    drm_fb_xrgb8888_to_bgr888_line);
+}
+EXPORT_SYMBOL(drm_fb_xrgb8888_to_bgr888);
+
 static void drm_fb_xrgb8888_to_argb8888_line(void *dbuf, const void *sbuf, unsigned int pixels)
 {
 	__le32 *dbuf32 = dbuf;
@@ -1035,6 +1086,9 @@ int drm_fb_blit(struct iosys_map *dst, const unsigned int *dst_pitch, uint32_t d
 		} else if (dst_format == DRM_FORMAT_RGB888) {
 			drm_fb_xrgb8888_to_rgb888(dst, dst_pitch, src, fb, clip, state);
 			return 0;
+		} else if (dst_format == DRM_FORMAT_BGR888) {
+			drm_fb_xrgb8888_to_bgr888(dst, dst_pitch, src, fb, clip, state);
+			return 0;
 		} else if (dst_format == DRM_FORMAT_ARGB8888) {
 			drm_fb_xrgb8888_to_argb8888(dst, dst_pitch, src, fb, clip, state);
 			return 0;
diff --git a/drivers/gpu/drm/tests/drm_format_helper_test.c b/drivers/gpu/drm/tests/drm_format_helper_test.c
index 08992636e..35cd3405d 100644
--- a/drivers/gpu/drm/tests/drm_format_helper_test.c
+++ b/drivers/gpu/drm/tests/drm_format_helper_test.c
@@ -60,6 +60,11 @@ struct convert_to_rgb888_result {
 	const u8 expected[TEST_BUF_SIZE];
 };
 
+struct convert_to_bgr888_result {
+	unsigned int dst_pitch;
+	const u8 expected[TEST_BUF_SIZE];
+};
+
 struct convert_to_argb8888_result {
 	unsigned int dst_pitch;
 	const u32 expected[TEST_BUF_SIZE];
@@ -107,6 +112,7 @@ struct convert_xrgb8888_case {
 	struct convert_to_argb1555_result argb1555_result;
 	struct convert_to_rgba5551_result rgba5551_result;
 	struct convert_to_rgb888_result rgb888_result;
+	struct convert_to_bgr888_result bgr888_result;
 	struct convert_to_argb8888_result argb8888_result;
 	struct convert_to_xrgb2101010_result xrgb2101010_result;
 	struct convert_to_argb2101010_result argb2101010_result;
@@ -151,6 +157,10 @@ static struct convert_xrgb8888_case convert_xrgb8888_cases[] = {
 			.dst_pitch = TEST_USE_DEFAULT_PITCH,
 			.expected = { 0x00, 0x00, 0xFF },
 		},
+		.bgr888_result = {
+			.dst_pitch = TEST_USE_DEFAULT_PITCH,
+			.expected = { 0xFF, 0x00, 0x00 },
+		},
 		.argb8888_result = {
 			.dst_pitch = TEST_USE_DEFAULT_PITCH,
 			.expected = { 0xFFFF0000 },
@@ -217,6 +227,10 @@ static struct convert_xrgb8888_case convert_xrgb8888_cases[] = {
 			.dst_pitch = TEST_USE_DEFAULT_PITCH,
 			.expected = { 0x00, 0x00, 0xFF },
 		},
+		.bgr888_result = {
+			.dst_pitch = TEST_USE_DEFAULT_PITCH,
+			.expected = { 0xFF, 0x00, 0x00 },
+		},
 		.argb8888_result = {
 			.dst_pitch = TEST_USE_DEFAULT_PITCH,
 			.expected = { 0xFFFF0000 },
@@ -330,6 +344,15 @@ static struct convert_xrgb8888_case convert_xrgb8888_cases[] = {
 				0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0x00,
 			},
 		},
+		.bgr888_result = {
+			.dst_pitch = TEST_USE_DEFAULT_PITCH,
+			.expected = {
+				0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00,
+				0xFF, 0x00, 0x00, 0x00, 0xFF, 0x00,
+				0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF,
+				0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF,
+			},
+		},
 		.argb8888_result = {
 			.dst_pitch = TEST_USE_DEFAULT_PITCH,
 			.expected = {
@@ -468,6 +491,17 @@ static struct convert_xrgb8888_case convert_xrgb8888_cases[] = {
 				0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 			},
 		},
+		.bgr888_result = {
+			.dst_pitch = 15,
+			.expected = {
+				0x0E, 0x44, 0x9C, 0x11, 0x4D, 0x05, 0xA8, 0xF3, 0x03,
+				0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+				0x6C, 0xF0, 0x73, 0x0E, 0x44, 0x9C, 0x11, 0x4D, 0x05,
+				0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+				0xA8, 0x03, 0x03, 0x6C, 0xF0, 0x73, 0x0E, 0x44, 0x9C,
+				0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+			},
+		},
 		.argb8888_result = {
 			.dst_pitch = 20,
 			.expected = {
@@ -914,6 +948,52 @@ static void drm_test_fb_xrgb8888_to_rgb888(struct kunit *test)
 	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
 }
 
+static void drm_test_fb_xrgb8888_to_bgr888(struct kunit *test)
+{
+	const struct convert_xrgb8888_case *params = test->param_value;
+	const struct convert_to_bgr888_result *result = &params->bgr888_result;
+	size_t dst_size;
+	u8 *buf = NULL;
+	__le32 *xrgb8888 = NULL;
+	struct iosys_map dst, src;
+
+	struct drm_framebuffer fb = {
+		.format = drm_format_info(DRM_FORMAT_XRGB8888),
+		.pitches = { params->pitch, 0, 0 },
+	};
+
+	dst_size = conversion_buf_size(DRM_FORMAT_BGR888, result->dst_pitch,
+				       &params->clip, 0);
+	KUNIT_ASSERT_GT(test, dst_size, 0);
+
+	buf = kunit_kzalloc(test, dst_size, GFP_KERNEL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, buf);
+	iosys_map_set_vaddr(&dst, buf);
+
+	xrgb8888 = cpubuf_to_le32(test, params->xrgb8888, TEST_BUF_SIZE);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, xrgb8888);
+	iosys_map_set_vaddr(&src, xrgb8888);
+
+	/*
+	 * BGR888 expected results are already in little-endian
+	 * order, so there's no need to convert the test output.
+	 */
+	drm_fb_xrgb8888_to_bgr888(&dst, &result->dst_pitch, &src, &fb, &params->clip,
+				  &fmtcnv_state);
+	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
+
+	buf = dst.vaddr; /* restore original value of buf */
+	memset(buf, 0, dst_size);
+
+	int blit_result = 0;
+
+	blit_result = drm_fb_blit(&dst, &result->dst_pitch, DRM_FORMAT_BGR888, &src, &fb, &params->clip,
+				  &fmtcnv_state);
+
+	KUNIT_EXPECT_FALSE(test, blit_result);
+	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
+}
+
 static void drm_test_fb_xrgb8888_to_argb8888(struct kunit *test)
 {
 	const struct convert_xrgb8888_case *params = test->param_value;
@@ -1851,6 +1931,7 @@ static struct kunit_case drm_format_helper_test_cases[] = {
 	KUNIT_CASE_PARAM(drm_test_fb_xrgb8888_to_argb1555, convert_xrgb8888_gen_params),
 	KUNIT_CASE_PARAM(drm_test_fb_xrgb8888_to_rgba5551, convert_xrgb8888_gen_params),
 	KUNIT_CASE_PARAM(drm_test_fb_xrgb8888_to_rgb888, convert_xrgb8888_gen_params),
+	KUNIT_CASE_PARAM(drm_test_fb_xrgb8888_to_bgr888, convert_xrgb8888_gen_params),
 	KUNIT_CASE_PARAM(drm_test_fb_xrgb8888_to_argb8888, convert_xrgb8888_gen_params),
 	KUNIT_CASE_PARAM(drm_test_fb_xrgb8888_to_xrgb2101010, convert_xrgb8888_gen_params),
 	KUNIT_CASE_PARAM(drm_test_fb_xrgb8888_to_argb2101010, convert_xrgb8888_gen_params),
diff --git a/include/drm/drm_format_helper.h b/include/drm/drm_format_helper.h
index 428d81afe..aa1604d92 100644
--- a/include/drm/drm_format_helper.h
+++ b/include/drm/drm_format_helper.h
@@ -96,6 +96,9 @@ void drm_fb_xrgb8888_to_rgba5551(struct iosys_map *dst, const unsigned int *dst_
 void drm_fb_xrgb8888_to_rgb888(struct iosys_map *dst, const unsigned int *dst_pitch,
 			       const struct iosys_map *src, const struct drm_framebuffer *fb,
 			       const struct drm_rect *clip, struct drm_format_conv_state *state);
+void drm_fb_xrgb8888_to_bgr888(struct iosys_map *dst, const unsigned int *dst_pitch,
+			       const struct iosys_map *src, const struct drm_framebuffer *fb,
+			       const struct drm_rect *clip, struct drm_format_conv_state *state);
 void drm_fb_xrgb8888_to_argb8888(struct iosys_map *dst, const unsigned int *dst_pitch,
 				 const struct iosys_map *src, const struct drm_framebuffer *fb,
 				 const struct drm_rect *clip, struct drm_format_conv_state *state);
-- 
2.43.0

[PATCH v3 2/3] lib/vsprintf: Add support for generic FOURCCs by extending %p4cc

[Aditya Garg]

From: Hector Martin <marcan@marcan.st>

%p4cc is designed for DRM/V4L2 FOURCCs with their specific quirks, but
it's useful to be able to print generic 4-character codes formatted as
an integer. Extend it to add format specifiers for printing generic
32-bit FOURCCs with various endian semantics:

%p4ch   Host-endian
%p4cl	Little-endian
%p4cb	Big-endian
%p4cr	Reverse-endian

The endianness determines how bytes are interpreted as a u32, and the
FOURCC is then always printed MSByte-first (this is the opposite of
V4L/DRM FOURCCs). This covers most practical cases, e.g. %p4cr would
allow printing LSByte-first FOURCCs stored in host endian order
(other than the hex form being in character order, not the integer
value).

Signed-off-by: Hector Martin <marcan@marcan.st>
Signed-off-by: Aditya Garg <gargaditya08@live.com>
---
v2 -> Add this patch
v3 -> Make array static
 Documentation/core-api/printk-formats.rst | 32 +++++++++++++++++++
 lib/test_printf.c                         | 39 +++++++++++++++++++----
 lib/vsprintf.c                            | 38 ++++++++++++++++++----
 scripts/checkpatch.pl                     |  2 +-
 4 files changed, 97 insertions(+), 14 deletions(-)

diff --git a/Documentation/core-api/printk-formats.rst b/Documentation/core-api/printk-formats.rst
index ecccc0473..9982861fa 100644
--- a/Documentation/core-api/printk-formats.rst
+++ b/Documentation/core-api/printk-formats.rst
@@ -648,6 +648,38 @@ Examples::
 	%p4cc	Y10  little-endian (0x20303159)
 	%p4cc	NV12 big-endian (0xb231564e)
 
+Generic FourCC code
+-------------------
+
+::
+	%p4c[hrbl]	gP00 (0x67503030)
+
+Print a generic FourCC code, as both ASCII characters and its numerical
+value as hexadecimal.
+
+The additional ``h``, ``r``, ``b``, and ``l`` specifiers are used to specify
+host, reversed, big or little endian order data respectively. Host endian
+order means the data is interpreted as a 32-bit integer and the most
+significant byte is printed first; that is, the character code as printed
+matches the byte order stored in memory on big-endian systems, and is reversed
+on little-endian systems.
+
+Passed by reference.
+
+Examples for a little-endian machine, given &(u32)0x67503030::
+
+	%p4ch	gP00 (0x67503030)
+	%p4cr	00Pg (0x30305067)
+	%p4cb	00Pg (0x30305067)
+	%p4cl	gP00 (0x67503030)
+
+Examples for a big-endian machine, given &(u32)0x67503030::
+
+	%p4ch	gP00 (0x67503030)
+	%p4cr	00Pg (0x30305067)
+	%p4cb	gP00 (0x67503030)
+	%p4cl	00Pg (0x30305067)
+
 Rust
 ----
 
diff --git a/lib/test_printf.c b/lib/test_printf.c
index 59dbe4f9a..4bde40822 100644
--- a/lib/test_printf.c
+++ b/lib/test_printf.c
@@ -776,21 +776,46 @@ static void __init fwnode_pointer(void)
 	software_node_unregister_node_group(group);
 }
 
+struct fourcc_struct {
+	u32 code;
+	const char *str;
+};
+
+static void __init fourcc_pointer_test(const struct fourcc_struct *fc, size_t n,
+				       const char *fmt)
+{
+	size_t i;
+
+	for (i = 0; i < n; i++)
+		test(fc[i].str, fmt, &fc[i].code);
+}
+
 static void __init fourcc_pointer(void)
 {
-	struct {
-		u32 code;
-		char *str;
-	} const try[] = {
+	static const struct fourcc_struct try_cc[] = {
 		{ 0x3231564e, "NV12 little-endian (0x3231564e)", },
 		{ 0xb231564e, "NV12 big-endian (0xb231564e)", },
 		{ 0x10111213, ".... little-endian (0x10111213)", },
 		{ 0x20303159, "Y10  little-endian (0x20303159)", },
 	};
-	unsigned int i;
+	static const struct fourcc_struct try_ch = {
+		0x41424344, "ABCD (0x41424344)",
+	};
+	struct const struct fourcc_struct try_cr = {
+		0x41424344, "DCBA (0x44434241)",
+	};
+	static const struct fourcc_struct try_cl = {
+		le32_to_cpu(0x41424344), "ABCD (0x41424344)",
+	};
+	struct const struct fourcc_struct try_cb = {
+		be32_to_cpu(0x41424344), "ABCD (0x41424344)",
+	};
 
-	for (i = 0; i < ARRAY_SIZE(try); i++)
-		test(try[i].str, "%p4cc", &try[i].code);
+	fourcc_pointer_test(try_cc, ARRAY_SIZE(try_cc), "%p4cc");
+	fourcc_pointer_test(&try_ch, 1, "%p4ch");
+	fourcc_pointer_test(&try_cr, 1, "%p4cr");
+	fourcc_pointer_test(&try_cl, 1, "%p4cl");
+	fourcc_pointer_test(&try_cb, 1, "%p4cb");
 }
 
 static void __init
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 56fe96319..13733a4da 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1781,27 +1781,53 @@ char *fourcc_string(char *buf, char *end, const u32 *fourcc,
 	char output[sizeof("0123 little-endian (0x01234567)")];
 	char *p = output;
 	unsigned int i;
+	bool pixel_fmt = false;
 	u32 orig, val;
 
-	if (fmt[1] != 'c' || fmt[2] != 'c')
+	if (fmt[1] != 'c')
 		return error_string(buf, end, "(%p4?)", spec);
 
 	if (check_pointer(&buf, end, fourcc, spec))
 		return buf;
 
 	orig = get_unaligned(fourcc);
-	val = orig & ~BIT(31);
+	switch (fmt[2]) {
+	case 'h':
+		val = orig;
+		break;
+	case 'r':
+		orig = swab32(orig);
+		val = orig;
+		break;
+	case 'l':
+		orig = le32_to_cpu(orig);
+		val = orig;
+		break;
+	case 'b':
+		orig = be32_to_cpu(orig);
+		val = orig;
+		break;
+	case 'c':
+		/* Pixel formats are printed LSB-first */
+		val = swab32(orig & ~BIT(31));
+		pixel_fmt = true;
+		break;
+	default:
+		return error_string(buf, end, "(%p4?)", spec);
+	}
 
 	for (i = 0; i < sizeof(u32); i++) {
-		unsigned char c = val >> (i * 8);
+		unsigned char c = val >> ((3 - i) * 8);
 
 		/* Print non-control ASCII characters as-is, dot otherwise */
 		*p++ = isascii(c) && isprint(c) ? c : '.';
 	}
 
-	*p++ = ' ';
-	strcpy(p, orig & BIT(31) ? "big-endian" : "little-endian");
-	p += strlen(p);
+	if (pixel_fmt) {
+		*p++ = ' ';
+		strcpy(p, orig & BIT(31) ? "big-endian" : "little-endian");
+		p += strlen(p);
+	}
 
 	*p++ = ' ';
 	*p++ = '(';
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 7b28ad331..21516f753 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -6904,7 +6904,7 @@ sub process {
 					    ($extension eq "f" &&
 					     defined $qualifier && $qualifier !~ /^w/) ||
 					    ($extension eq "4" &&
-					     defined $qualifier && $qualifier !~ /^cc/)) {
+					     defined $qualifier && $qualifier !~ /^c[chlbr]/)) {
 						$bad_specifier = $specifier;
 						last;
 					}
-- 
2.43.0

Re: [PATCH v3 2/3] lib/vsprintf: Add support for generic FOURCCs by extending %p4cc

[Rasmus Villemoes]

On Fri, 21 Feb 2025 at 12:37, Aditya Garg <gargaditya08@live.com> wrote:
>
> From: Hector Martin <marcan@marcan.st>
>
> %p4cc is designed for DRM/V4L2 FOURCCs with their specific quirks, but
> it's useful to be able to print generic 4-character codes formatted as
> an integer. Extend it to add format specifiers for printing generic
> 32-bit FOURCCs with various endian semantics:
>
> %p4ch   Host-endian
> %p4cl   Little-endian
> %p4cb   Big-endian
> %p4cr   Reverse-endian
>
> The endianness determines how bytes are interpreted as a u32, and the
> FOURCC is then always printed MSByte-first (this is the opposite of
> V4L/DRM FOURCCs). This covers most practical cases, e.g. %p4cr would
> allow printing LSByte-first FOURCCs stored in host endian order
> (other than the hex form being in character order, not the integer
> value).
>
> Signed-off-by: Hector Martin <marcan@marcan.st>
> Signed-off-by: Aditya Garg <gargaditya08@live.com>

Acked-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>

Re: [PATCH v3 2/3] lib/vsprintf: Add support for generic FOURCCs by extending %p4cc

[andriy.shevchenko]

On Fri, Feb 21, 2025 at 11:37:13AM +0000, Aditya Garg wrote:
> From: Hector Martin <marcan@marcan.st>

First of all, I do not see the cover letter. Is it only an issue on my side?

> %p4cc is designed for DRM/V4L2 FOURCCs with their specific quirks, but
> it's useful to be able to print generic 4-character codes formatted as
> an integer. Extend it to add format specifiers for printing generic
> 32-bit FOURCCs with various endian semantics:
> 
> %p4ch   Host-endian
> %p4cl	Little-endian
> %p4cb	Big-endian
> %p4cr	Reverse-endian
> 
> The endianness determines how bytes are interpreted as a u32, and the
> FOURCC is then always printed MSByte-first (this is the opposite of
> V4L/DRM FOURCCs). This covers most practical cases, e.g. %p4cr would
> allow printing LSByte-first FOURCCs stored in host endian order
> (other than the hex form being in character order, not the integer
> value).

Second, don't issue versions too fast, give at least a few days for the
reviewers to have a chance on looking into it.

Due to above this inherits the same issues as v2, please refer to my comments
there.

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v3 2/3] lib/vsprintf: Add support for generic FOURCCs by extending %p4cc

[Aditya Garg]

> On 21 Feb 2025, at 8:59 PM, andriy.shevchenko@linux.intel.com wrote:
> 
> On Fri, Feb 21, 2025 at 11:37:13AM +0000, Aditya Garg wrote:
>> From: Hector Martin <marcan@marcan.st>
> 
> First of all, I do not see the cover letter. Is it only an issue on my side?

These are literally 3 patches that are self explanatory. Is this a hard and fast rule that a cover letter MUST be there?

> 
>> %p4cc is designed for DRM/V4L2 FOURCCs with their specific quirks, but
>> it's useful to be able to print generic 4-character codes formatted as
>> an integer. Extend it to add format specifiers for printing generic
>> 32-bit FOURCCs with various endian semantics:
>> 
>> %p4ch   Host-endian
>> %p4cl Little-endian
>> %p4cb Big-endian
>> %p4cr Reverse-endian
>> 
>> The endianness determines how bytes are interpreted as a u32, and the
>> FOURCC is then always printed MSByte-first (this is the opposite of
>> V4L/DRM FOURCCs). This covers most practical cases, e.g. %p4cr would
>> allow printing LSByte-first FOURCCs stored in host endian order
>> (other than the hex form being in character order, not the integer
>> value).
> 
> Second, don't issue versions too fast, give at least a few days for the
> reviewers to have a chance on looking into it.

Sure, I’ll take care of that.

BTW, a found a typo:

+ static const struct fourcc_struct try_ch = {
+ 0x41424344, "ABCD (0x41424344)",
+ };
+ struct const struct fourcc_struct try_cr = {
+ 0x41424344, "DCBA (0x44434241)",
+ };
+ static const struct fourcc_struct try_cl = {
+ le32_to_cpu(0x41424344), "ABCD (0x41424344)",
+ };
+ struct const struct fourcc_struct try_cb = {
+ be32_to_cpu(0x41424344), "ABCD (0x41424344)",
+ };

Mistyped struct instead of static. Will fix in v4.

Re: [PATCH v3 2/3] lib/vsprintf: Add support for generic FOURCCs by extending %p4cc

[andriy.shevchenko]

On Fri, Feb 21, 2025 at 07:37:17PM +0000, Aditya Garg wrote:
> > On 21 Feb 2025, at 8:59 PM, andriy.shevchenko@linux.intel.com wrote:
> > On Fri, Feb 21, 2025 at 11:37:13AM +0000, Aditya Garg wrote:

> > First of all, I do not see the cover letter. Is it only an issue on my side?
> 
> These are literally 3 patches that are self explanatory.

So what? Anybody will be puzzled with the simple question (and probably not the
only one): Why are these in the series? Do they dependent or independent? What's
the goal and how they should be routed? (You see, there are already 4).

> Is this a hard and fast rule that a cover letter MUST be there?

Cover letter SHOULD be there if there are more than one patch.
Yes, there are exceptions, but this is the idea for the series.

Use your common sense, if there is no documented thingy.

...

> > Second, don't issue versions too fast, give at least a few days for the
> > reviewers to have a chance on looking into it.
> 
> Sure, I’ll take care of that.

Btw, _this_ is very clearly documented.

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v3 2/3] lib/vsprintf: Add support for generic FOURCCs by extending %p4cc

[andriy.shevchenko]

On Fri, Feb 21, 2025 at 10:18:16PM +0200, andriy.shevchenko@linux.intel.com wrote:
> On Fri, Feb 21, 2025 at 07:37:17PM +0000, Aditya Garg wrote:
> > > On 21 Feb 2025, at 8:59 PM, andriy.shevchenko@linux.intel.com wrote:
> > > On Fri, Feb 21, 2025 at 11:37:13AM +0000, Aditya Garg wrote:
> 
> > > First of all, I do not see the cover letter. Is it only an issue on my side?
> > 
> > These are literally 3 patches that are self explanatory.
> 
> So what? Anybody will be puzzled with the simple question (and probably not the
> only one): Why are these in the series? Do they dependent or independent? What's
> the goal and how they should be routed? (You see, there are already 4).
> 
> > Is this a hard and fast rule that a cover letter MUST be there?
> 
> Cover letter SHOULD be there if there are more than one patch.
> Yes, there are exceptions, but this is the idea for the series.

FWIW, two more points:
1) yes, it's a MUST for some subsystems (BPF has this even documented);
2) there are tools (`b4`) that rely on the cover letter (shazam feature
or multiplying trailers if it/they was/were given against the cover letter).

> Use your common sense, if there is no documented thingy.

-- 
With Best Regards,
Andy Shevchenko

[PATCH v3 3/3] drm/tiny: add driver for Apple Touch Bars in x86 Macs

[Aditya Garg]

From: Kerem Karabay <kekrby@gmail.com>

The Touch Bars found on x86 Macs support two USB configurations: one
where the device presents itself as a HID keyboard and can display
predefined sets of keys, and one where the operating system has full
control over what is displayed.

This commit adds support for the display functionality of the second
configuration. Functionality for the first configuration has been
merged in the HID tree.

Note that this driver has only been tested on T2 Macs, and only includes
the USB device ID for these devices. Testing on T1 Macs would be
appreciated.

Credit goes to Ben (Bingxing) Wang on GitHub [1] for reverse engineering
most of the protocol.

[1]: https://github.com/imbushuo/DFRDisplayKm

Signed-off-by: Kerem Karabay <kekrby@gmail.com>
Co-developed-by: Atharva Tiwari <evepolonium@gmail.com>
Signed-off-by: Atharva Tiwari <evepolonium@gmail.com>
Co-developed-by: Aditya Garg <gargaditya08@live.com>
Signed-off-by: Aditya Garg <gargaditya08@live.com>
Signed-off-by: Aun-Ali Zaidi <admin@kodeit.net>
---
v2 ->
- Add the driver to MAINTAINERS.
- Allocate memory for request and response in plane's atomic-check helper
- Void the use of drm_fb_blit()
- Implement atomic_disable
- Make PRIME work
- Remove the date field from struct drm_driver 
- intersect damage with dst_clip
- Register DRM device in appletbdrm_probe
- Clear the display as the final call in probe
- Select hid_multitouch as well in kconfig

v3 ->
- Change commit message to credit Ben (Bingxing) Wang
 MAINTAINERS                       |   7 +
 drivers/gpu/drm/tiny/Kconfig      |  14 +
 drivers/gpu/drm/tiny/Makefile     |   1 +
 drivers/gpu/drm/tiny/appletbdrm.c | 806 ++++++++++++++++++++++++++++++
 4 files changed, 828 insertions(+)
 create mode 100644 drivers/gpu/drm/tiny/appletbdrm.c

diff --git a/MAINTAINERS b/MAINTAINERS
index efee40ea5..43fafaab3 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -7148,6 +7148,13 @@ S:	Supported
 T:	git https://gitlab.freedesktop.org/drm/misc/kernel.git
 F:	drivers/gpu/drm/sun4i/sun8i*
 
+DRM DRIVER FOR APPLE TOUCH BARS
+M:	Aun-Ali Zaidi <admin@kodeit.net>
+L:	dri-devel@lists.freedesktop.org
+S:	Maintained
+T:	git https://gitlab.freedesktop.org/drm/misc/kernel.git
+F:	drivers/gpu/drm/tiny/appletbdrm.c
+
 DRM DRIVER FOR ARM PL111 CLCD
 M:	Linus Walleij <linus.walleij@linaro.org>
 S:	Maintained
diff --git a/drivers/gpu/drm/tiny/Kconfig b/drivers/gpu/drm/tiny/Kconfig
index 94cbdb133..25471791c 100644
--- a/drivers/gpu/drm/tiny/Kconfig
+++ b/drivers/gpu/drm/tiny/Kconfig
@@ -1,5 +1,19 @@
 # SPDX-License-Identifier: GPL-2.0-only
 
+config DRM_APPLETBDRM
+	tristate "DRM support for Apple Touch Bars"
+	depends on DRM && USB && MMU
+	select DRM_GEM_SHMEM_HELPER
+	select DRM_KMS_HELPER
+	select HID_APPLETB_BL
+	select HID_MULTITOUCH
+	help
+	  Say Y here if you want support for the display of Touch Bars on x86
+	  MacBook Pros.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called appletbdrm.
+
 config DRM_ARCPGU
 	tristate "ARC PGU"
 	depends on DRM && OF
diff --git a/drivers/gpu/drm/tiny/Makefile b/drivers/gpu/drm/tiny/Makefile
index 60816d2eb..0a3a7837a 100644
--- a/drivers/gpu/drm/tiny/Makefile
+++ b/drivers/gpu/drm/tiny/Makefile
@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0-only
 
+obj-$(CONFIG_DRM_APPLETBDRM)		+= appletbdrm.o
 obj-$(CONFIG_DRM_ARCPGU)		+= arcpgu.o
 obj-$(CONFIG_DRM_BOCHS)			+= bochs.o
 obj-$(CONFIG_DRM_CIRRUS_QEMU)		+= cirrus-qemu.o
diff --git a/drivers/gpu/drm/tiny/appletbdrm.c b/drivers/gpu/drm/tiny/appletbdrm.c
new file mode 100644
index 000000000..a17a3ecc3
--- /dev/null
+++ b/drivers/gpu/drm/tiny/appletbdrm.c
@@ -0,0 +1,806 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Apple Touch Bar DRM Driver
+ *
+ * Copyright (c) 2023 Kerem Karabay <kekrby@gmail.com>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/unaligned.h>
+#include <linux/usb.h>
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_damage_helper.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_encoder.h>
+#include <drm/drm_format_helper.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_framebuffer.h>
+#include <drm/drm_gem_atomic_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_gem_shmem_helper.h>
+#include <drm/drm_plane.h>
+#include <drm/drm_probe_helper.h>
+
+#define __APPLETBDRM_MSG_STR4(str4)	((__le32 __force)((str4[0] << 24) | (str4[1] << 16) | (str4[2] << 8) | str4[3]))
+#define __APPLETBDRM_MSG_TOK4(tok4)	__APPLETBDRM_MSG_STR4(#tok4)
+
+#define APPLETBDRM_PIXEL_FORMAT		__APPLETBDRM_MSG_TOK4(RGBA) /* The actual format is BGR888 */
+#define APPLETBDRM_BITS_PER_PIXEL	24
+
+#define APPLETBDRM_MSG_CLEAR_DISPLAY	__APPLETBDRM_MSG_TOK4(CLRD)
+#define APPLETBDRM_MSG_GET_INFORMATION	__APPLETBDRM_MSG_TOK4(GINF)
+#define APPLETBDRM_MSG_UPDATE_COMPLETE	__APPLETBDRM_MSG_TOK4(UDCL)
+#define APPLETBDRM_MSG_SIGNAL_READINESS	__APPLETBDRM_MSG_TOK4(REDY)
+
+#define APPLETBDRM_BULK_MSG_TIMEOUT	1000
+
+#define drm_to_adev(_drm)		container_of(_drm, struct appletbdrm_device, drm)
+#define adev_to_udev(adev)		interface_to_usbdev(to_usb_interface(adev->dev))
+
+struct appletbdrm_msg_request_header {
+	__le16 unk_00;
+	__le16 unk_02;
+	__le32 unk_04;
+	__le32 unk_08;
+	__le32 size;
+} __packed;
+
+struct appletbdrm_msg_response_header {
+	u8 unk_00[16];
+	__le32 msg;
+} __packed;
+
+struct appletbdrm_msg_simple_request {
+	struct appletbdrm_msg_request_header header;
+	__le32 msg;
+	u8 unk_14[8];
+	__le32 size;
+} __packed;
+
+struct appletbdrm_msg_information {
+	struct appletbdrm_msg_response_header header;
+	u8 unk_14[12];
+	__le32 width;
+	__le32 height;
+	u8 bits_per_pixel;
+	__le32 bytes_per_row;
+	__le32 orientation;
+	__le32 bitmap_info;
+	__le32 pixel_format;
+	__le32 width_inches;	/* floating point */
+	__le32 height_inches;	/* floating point */
+} __packed;
+
+struct appletbdrm_frame {
+	__le16 begin_x;
+	__le16 begin_y;
+	__le16 width;
+	__le16 height;
+	__le32 buf_size;
+	u8 buf[];
+} __packed;
+
+struct appletbdrm_fb_request_footer {
+	u8 unk_00[12];
+	__le32 unk_0c;
+	u8 unk_10[12];
+	__le32 unk_1c;
+	__le64 timestamp;
+	u8 unk_28[12];
+	__le32 unk_34;
+	u8 unk_38[20];
+	__le32 unk_4c;
+} __packed;
+
+struct appletbdrm_fb_request {
+	struct appletbdrm_msg_request_header header;
+	__le16 unk_10;
+	u8 msg_id;
+	u8 unk_13[29];
+	/*
+	 * Contents of `data`:
+	 * - struct appletbdrm_frame frames[];
+	 * - struct appletbdrm_fb_request_footer footer;
+	 * - padding to make the total size a multiple of 16
+	 */
+	u8 data[];
+} __packed;
+
+struct appletbdrm_fb_request_response {
+	struct appletbdrm_msg_response_header header;
+	u8 unk_14[12];
+	__le64 timestamp;
+} __packed;
+
+struct appletbdrm_device {
+	struct device *dev;
+	struct device *dmadev;
+
+	unsigned int in_ep;
+	unsigned int out_ep;
+
+	unsigned int width;
+	unsigned int height;
+
+	struct drm_device drm;
+	struct drm_display_mode mode;
+	struct drm_connector connector;
+	struct drm_plane primary_plane;
+	struct drm_crtc crtc;
+	struct drm_encoder encoder;
+};
+
+struct appletbdrm_plane_state {
+	struct drm_shadow_plane_state base;
+	struct appletbdrm_fb_request *request;
+	struct appletbdrm_fb_request_response *response;
+	size_t request_size;
+	size_t frames_size;
+};
+
+static inline struct appletbdrm_plane_state *to_appletbdrm_plane_state(struct drm_plane_state *state)
+{
+	return container_of(state, struct appletbdrm_plane_state, base.base);
+}
+
+static int appletbdrm_send_request(struct appletbdrm_device *adev,
+				   struct appletbdrm_msg_request_header *request, size_t size)
+{
+	struct usb_device *udev = adev_to_udev(adev);
+	struct drm_device *drm = &adev->drm;
+	int ret, actual_size;
+
+	ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, adev->out_ep),
+			   request, size, &actual_size, APPLETBDRM_BULK_MSG_TIMEOUT);
+	if (ret) {
+		drm_err(drm, "Failed to send message (%d)\n", ret);
+		return ret;
+	}
+
+	if (actual_size != size) {
+		drm_err(drm, "Actual size (%d) doesn't match expected size (%lu)\n",
+			actual_size, size);
+		return -EIO;
+	}
+
+	return ret;
+}
+
+static int appletbdrm_read_response(struct appletbdrm_device *adev,
+				    struct appletbdrm_msg_response_header *response,
+				    size_t size, u32 expected_response)
+{
+	struct usb_device *udev = adev_to_udev(adev);
+	struct drm_device *drm = &adev->drm;
+	int ret, actual_size;
+	bool readiness_signal_received = false;
+
+retry:
+	ret = usb_bulk_msg(udev, usb_rcvbulkpipe(udev, adev->in_ep),
+			   response, size, &actual_size, APPLETBDRM_BULK_MSG_TIMEOUT);
+	if (ret) {
+		drm_err(drm, "Failed to read response (%d)\n", ret);
+		return ret;
+	}
+
+	/*
+	 * The device responds to the first request sent in a particular
+	 * timeframe after the USB device configuration is set with a readiness
+	 * signal, in which case the response should be read again
+	 */
+	if (response->msg == APPLETBDRM_MSG_SIGNAL_READINESS) {
+		if (!readiness_signal_received) {
+			readiness_signal_received = true;
+			goto retry;
+		}
+
+		drm_err(drm, "Encountered unexpected readiness signal\n");
+		return -EIO;
+	}
+
+	if (actual_size != size) {
+		drm_err(drm, "Actual size (%d) doesn't match expected size (%lu)\n",
+			actual_size, size);
+		return -EIO;
+	}
+
+	if (response->msg != expected_response) {
+		drm_err(drm, "Unexpected response from device (expected %p4ch found %p4ch)\n",
+			&expected_response, &response->msg);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static int appletbdrm_send_msg(struct appletbdrm_device *adev, u32 msg)
+{
+	struct appletbdrm_msg_simple_request *request;
+	int ret;
+
+	request = kzalloc(sizeof(*request), GFP_KERNEL);
+	if (!request)
+		return -ENOMEM;
+
+	request->header.unk_00 = cpu_to_le16(2);
+	request->header.unk_02 = cpu_to_le16(0x1512);
+	request->header.size = cpu_to_le32(sizeof(*request) - sizeof(request->header));
+	request->msg = msg;
+	request->size = request->header.size;
+
+	ret = appletbdrm_send_request(adev, &request->header, sizeof(*request));
+
+	kfree(request);
+
+	return ret;
+}
+
+static int appletbdrm_clear_display(struct appletbdrm_device *adev)
+{
+	return appletbdrm_send_msg(adev, APPLETBDRM_MSG_CLEAR_DISPLAY);
+}
+
+static int appletbdrm_signal_readiness(struct appletbdrm_device *adev)
+{
+	return appletbdrm_send_msg(adev, APPLETBDRM_MSG_SIGNAL_READINESS);
+}
+
+static int appletbdrm_get_information(struct appletbdrm_device *adev)
+{
+	struct appletbdrm_msg_information *info;
+	struct drm_device *drm = &adev->drm;
+	u8 bits_per_pixel;
+	u32 pixel_format;
+	int ret;
+
+	info = kzalloc(sizeof(*info), GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	ret = appletbdrm_send_msg(adev, APPLETBDRM_MSG_GET_INFORMATION);
+	if (ret)
+		return ret;
+
+	ret = appletbdrm_read_response(adev, &info->header, sizeof(*info),
+				       APPLETBDRM_MSG_GET_INFORMATION);
+	if (ret)
+		goto free_info;
+
+	bits_per_pixel = info->bits_per_pixel;
+	pixel_format = get_unaligned(&info->pixel_format);
+
+	adev->width = get_unaligned_le32(&info->width);
+	adev->height = get_unaligned_le32(&info->height);
+
+	if (bits_per_pixel != APPLETBDRM_BITS_PER_PIXEL) {
+		drm_err(drm, "Encountered unexpected bits per pixel value (%d)\n", bits_per_pixel);
+		ret = -EINVAL;
+		goto free_info;
+	}
+
+	if (pixel_format != APPLETBDRM_PIXEL_FORMAT) {
+		drm_err(drm, "Encountered unknown pixel format (%p4ch)\n", &pixel_format);
+		ret = -EINVAL;
+		goto free_info;
+	}
+
+free_info:
+	kfree(info);
+
+	return ret;
+}
+
+static u32 rect_size(struct drm_rect *rect)
+{
+	return drm_rect_width(rect) * drm_rect_height(rect) * (APPLETBDRM_BITS_PER_PIXEL / 8);
+}
+
+static int appletbdrm_connector_helper_get_modes(struct drm_connector *connector)
+{
+	struct appletbdrm_device *adev = drm_to_adev(connector->dev);
+
+	return drm_connector_helper_get_modes_fixed(connector, &adev->mode);
+}
+
+static const u32 appletbdrm_primary_plane_formats[] = {
+	DRM_FORMAT_BGR888,
+	DRM_FORMAT_XRGB8888, /* emulated */
+};
+
+static int appletbdrm_primary_plane_helper_atomic_check(struct drm_plane *plane,
+						   struct drm_atomic_state *state)
+{
+	struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, plane);
+	struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane);
+	struct drm_crtc *new_crtc = new_plane_state->crtc;
+	struct drm_crtc_state *new_crtc_state = NULL;
+	struct appletbdrm_plane_state *appletbdrm_state = to_appletbdrm_plane_state(new_plane_state);
+	struct drm_atomic_helper_damage_iter iter;
+	struct drm_rect damage;
+	size_t frames_size = 0;
+	size_t request_size;
+	int ret;
+
+	if (new_crtc)
+		new_crtc_state = drm_atomic_get_new_crtc_state(state, new_crtc);
+
+	ret = drm_atomic_helper_check_plane_state(new_plane_state, new_crtc_state,
+						  DRM_PLANE_NO_SCALING,
+						  DRM_PLANE_NO_SCALING,
+						  false, false);
+	if (ret)
+		return ret;
+	else if (!new_plane_state->visible)
+		return 0;
+
+	drm_atomic_helper_damage_iter_init(&iter, old_plane_state, new_plane_state);
+	drm_atomic_for_each_plane_damage(&iter, &damage) {
+		frames_size += struct_size((struct appletbdrm_frame *)0, buf, rect_size(&damage));
+	}
+
+	if (!frames_size)
+		return 0;
+
+	request_size = ALIGN(sizeof(struct appletbdrm_fb_request) +
+		       frames_size +
+		       sizeof(struct appletbdrm_fb_request_footer), 16);
+
+	appletbdrm_state->request = kzalloc(request_size, GFP_KERNEL);
+
+	if (!appletbdrm_state->request)
+		return -ENOMEM;
+
+	appletbdrm_state->response = kzalloc(sizeof(*appletbdrm_state->response), GFP_KERNEL);
+
+	if (!appletbdrm_state->response)
+		return -ENOMEM;
+
+	appletbdrm_state->request_size = request_size;
+	appletbdrm_state->frames_size = frames_size;
+
+	return 0;
+}
+
+static int appletbdrm_flush_damage(struct appletbdrm_device *adev,
+				   struct drm_plane_state *old_state,
+				   struct drm_plane_state *state)
+{
+	struct appletbdrm_plane_state *appletbdrm_state = to_appletbdrm_plane_state(state);
+	struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(state);
+	struct appletbdrm_fb_request_response *response = appletbdrm_state->response;
+	struct appletbdrm_fb_request_footer *footer;
+	struct drm_atomic_helper_damage_iter iter;
+	struct drm_framebuffer *fb = state->fb;
+	struct appletbdrm_fb_request *request = appletbdrm_state->request;
+	struct drm_device *drm = &adev->drm;
+	struct appletbdrm_frame *frame;
+	u64 timestamp = ktime_get_ns();
+	struct drm_rect damage;
+	size_t frames_size = appletbdrm_state->frames_size;
+	size_t request_size = appletbdrm_state->request_size;
+	int ret;
+
+	if (!frames_size)
+		return 0;
+
+	ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
+	if (ret) {
+		drm_err(drm, "Failed to start CPU framebuffer access (%d)\n", ret);
+		goto end_fb_cpu_access;
+	}
+
+	request->header.unk_00 = cpu_to_le16(2);
+	request->header.unk_02 = cpu_to_le16(0x12);
+	request->header.unk_04 = cpu_to_le32(9);
+	request->header.size = cpu_to_le32(request_size - sizeof(request->header));
+	request->unk_10 = cpu_to_le16(1);
+	request->msg_id = timestamp & 0xff;
+
+	frame = (struct appletbdrm_frame *)request->data;
+
+	drm_atomic_helper_damage_iter_init(&iter, old_state, state);
+	drm_atomic_for_each_plane_damage(&iter, &damage) {
+		struct drm_rect dst_clip = state->dst;
+		struct iosys_map dst = IOSYS_MAP_INIT_VADDR(frame->buf);
+		u32 buf_size = rect_size(&damage);
+
+		if (!drm_rect_intersect(&dst_clip, &damage))
+			continue;
+
+		/*
+		 * The coordinates need to be translated to the coordinate
+		 * system the device expects, see the comment in
+		 * appletbdrm_setup_mode_config
+		 */
+		frame->begin_x = cpu_to_le16(damage.y1);
+		frame->begin_y = cpu_to_le16(adev->height - damage.x2);
+		frame->width = cpu_to_le16(drm_rect_height(&damage));
+		frame->height = cpu_to_le16(drm_rect_width(&damage));
+		frame->buf_size = cpu_to_le32(buf_size);
+
+		switch (fb->format->format) {
+		case DRM_FORMAT_XRGB8888:
+			drm_fb_xrgb8888_to_bgr888(&dst, NULL, &shadow_plane_state->data[0], fb, &damage, &shadow_plane_state->fmtcnv_state);
+			break;
+		default:
+			drm_fb_memcpy(&dst, NULL, &shadow_plane_state->data[0], fb, &damage);
+			break;
+		}
+
+		frame = (void *)frame + struct_size(frame, buf, buf_size);
+	}
+
+	footer = (struct appletbdrm_fb_request_footer *)&request->data[frames_size];
+
+	footer->unk_0c = cpu_to_le32(0xfffe);
+	footer->unk_1c = cpu_to_le32(0x80001);
+	footer->unk_34 = cpu_to_le32(0x80002);
+	footer->unk_4c = cpu_to_le32(0xffff);
+	footer->timestamp = cpu_to_le64(timestamp);
+
+	ret = appletbdrm_send_request(adev, &request->header, request_size);
+	if (ret)
+		goto end_fb_cpu_access;
+
+	ret = appletbdrm_read_response(adev, &response->header, sizeof(*response),
+				       APPLETBDRM_MSG_UPDATE_COMPLETE);
+	if (ret)
+		goto end_fb_cpu_access;
+
+	if (response->timestamp != footer->timestamp) {
+		drm_err(drm, "Response timestamp (%llu) doesn't match request timestamp (%llu)\n",
+			le64_to_cpu(response->timestamp), timestamp);
+		goto end_fb_cpu_access;
+	}
+
+end_fb_cpu_access:
+	drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
+
+	return ret;
+}
+
+static void appletbdrm_primary_plane_helper_atomic_update(struct drm_plane *plane,
+						     struct drm_atomic_state *old_state)
+{
+	struct appletbdrm_device *adev = drm_to_adev(plane->dev);
+	struct drm_device *drm = plane->dev;
+	struct drm_plane_state *plane_state = plane->state;
+	struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(old_state, plane);
+	int idx;
+
+	if (!drm_dev_enter(drm, &idx))
+		return;
+
+	appletbdrm_flush_damage(adev, old_plane_state, plane_state);
+
+	drm_dev_exit(idx);
+}
+
+static void appletbdrm_primary_plane_helper_atomic_disable(struct drm_plane *plane,
+							   struct drm_atomic_state *state)
+{
+	struct drm_device *dev = plane->dev;
+	struct appletbdrm_device *adev = drm_to_adev(dev);
+	int idx;
+
+	if (!drm_dev_enter(dev, &idx))
+		return;
+
+	appletbdrm_clear_display(adev);
+
+	drm_dev_exit(idx);
+}
+
+static void appletbdrm_primary_plane_reset(struct drm_plane *plane)
+{
+	struct appletbdrm_plane_state *appletbdrm_state;
+
+	WARN_ON(plane->state);
+
+	appletbdrm_state = kzalloc(sizeof(*appletbdrm_state), GFP_KERNEL);
+	if (!appletbdrm_state)
+		return;
+
+	__drm_gem_reset_shadow_plane(plane, &appletbdrm_state->base);
+}
+
+static struct drm_plane_state *appletbdrm_primary_plane_duplicate_state(struct drm_plane *plane)
+{
+	struct drm_shadow_plane_state *new_shadow_plane_state;
+	struct appletbdrm_plane_state *old_appletbdrm_state;
+	struct appletbdrm_plane_state *appletbdrm_state;
+
+	if (WARN_ON(!plane->state))
+		return NULL;
+
+	old_appletbdrm_state = to_appletbdrm_plane_state(plane->state);
+	appletbdrm_state = kmemdup(old_appletbdrm_state, sizeof(*appletbdrm_state), GFP_KERNEL);
+	if (!appletbdrm_state)
+		return NULL;
+
+	/* Request and response are not duplicated and are allocated in .atomic_check */
+	appletbdrm_state->request = NULL;
+	appletbdrm_state->response = NULL;
+
+	new_shadow_plane_state = &appletbdrm_state->base;
+
+	__drm_gem_duplicate_shadow_plane_state(plane, new_shadow_plane_state);
+
+	return &new_shadow_plane_state->base;
+}
+
+static void appletbdrm_primary_plane_destroy_state(struct drm_plane *plane,
+						   struct drm_plane_state *state)
+{
+	struct appletbdrm_plane_state *appletbdrm_state = to_appletbdrm_plane_state(state);
+
+	kfree(appletbdrm_state->request);
+	kfree(appletbdrm_state->response);
+
+	__drm_gem_destroy_shadow_plane_state(&appletbdrm_state->base);
+
+	kfree(appletbdrm_state);
+}
+
+static const struct drm_plane_helper_funcs appletbdrm_primary_plane_helper_funcs = {
+	DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
+	.atomic_check = appletbdrm_primary_plane_helper_atomic_check,
+	.atomic_update = appletbdrm_primary_plane_helper_atomic_update,
+	.atomic_disable = appletbdrm_primary_plane_helper_atomic_disable,
+};
+
+static const struct drm_plane_funcs appletbdrm_primary_plane_funcs = {
+	.update_plane = drm_atomic_helper_update_plane,
+	.disable_plane = drm_atomic_helper_disable_plane,
+	.reset = appletbdrm_primary_plane_reset,
+	.atomic_duplicate_state = appletbdrm_primary_plane_duplicate_state,
+	.atomic_destroy_state = appletbdrm_primary_plane_destroy_state,
+	.destroy = drm_plane_cleanup,
+};
+
+static enum drm_mode_status appletbdrm_crtc_helper_mode_valid(struct drm_crtc *crtc,
+							  const struct drm_display_mode *mode)
+{
+	struct appletbdrm_device *adev = drm_to_adev(crtc->dev);
+
+	return drm_crtc_helper_mode_valid_fixed(crtc, mode, &adev->mode);
+}
+
+static const struct drm_mode_config_funcs appletbdrm_mode_config_funcs = {
+	.fb_create = drm_gem_fb_create_with_dirty,
+	.atomic_check = drm_atomic_helper_check,
+	.atomic_commit = drm_atomic_helper_commit,
+};
+
+static const struct drm_connector_funcs appletbdrm_connector_funcs = {
+	.reset = drm_atomic_helper_connector_reset,
+	.destroy = drm_connector_cleanup,
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+};
+
+static const struct drm_connector_helper_funcs appletbdrm_connector_helper_funcs = {
+	.get_modes = appletbdrm_connector_helper_get_modes,
+};
+
+static const struct drm_crtc_helper_funcs appletbdrm_crtc_helper_funcs = {
+	.mode_valid = appletbdrm_crtc_helper_mode_valid,
+};
+
+static const struct drm_crtc_funcs appletbdrm_crtc_funcs = {
+	.reset = drm_atomic_helper_crtc_reset,
+	.destroy = drm_crtc_cleanup,
+	.set_config = drm_atomic_helper_set_config,
+	.page_flip = drm_atomic_helper_page_flip,
+	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
+};
+
+static const struct drm_encoder_funcs appletbdrm_encoder_funcs = {
+	.destroy = drm_encoder_cleanup,
+};
+
+static struct drm_gem_object *appletbdrm_driver_gem_prime_import(struct drm_device *dev,
+								 struct dma_buf *dma_buf)
+{
+	struct appletbdrm_device *adev = drm_to_adev(dev);
+
+	if (!adev->dmadev)
+		return ERR_PTR(-ENODEV);
+
+	return drm_gem_prime_import_dev(dev, dma_buf, adev->dmadev);
+}
+
+DEFINE_DRM_GEM_FOPS(appletbdrm_drm_fops);
+
+static const struct drm_driver appletbdrm_drm_driver = {
+	DRM_GEM_SHMEM_DRIVER_OPS,
+	.gem_prime_import	= appletbdrm_driver_gem_prime_import,
+	.name			= "appletbdrm",
+	.desc			= "Apple Touch Bar DRM Driver",
+	.major			= 1,
+	.minor			= 0,
+	.driver_features	= DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
+	.fops			= &appletbdrm_drm_fops,
+};
+
+static int appletbdrm_setup_mode_config(struct appletbdrm_device *adev)
+{
+	struct drm_connector *connector = &adev->connector;
+	struct drm_plane *primary_plane;
+	struct drm_crtc *crtc;
+	struct drm_encoder *encoder;
+	struct drm_device *drm = &adev->drm;
+	struct device *dev = adev->dev;
+	int ret;
+
+	ret = drmm_mode_config_init(drm);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to initialize mode configuration\n");
+
+	primary_plane = &adev->primary_plane;
+	ret = drm_universal_plane_init(drm, primary_plane, 0,
+				       &appletbdrm_primary_plane_funcs,
+				       appletbdrm_primary_plane_formats,
+				       ARRAY_SIZE(appletbdrm_primary_plane_formats),
+				       NULL,
+				       DRM_PLANE_TYPE_PRIMARY, NULL);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to initialize universal plane object\n");
+	drm_plane_helper_add(primary_plane, &appletbdrm_primary_plane_helper_funcs);
+	drm_plane_enable_fb_damage_clips(primary_plane);
+
+	crtc = &adev->crtc;
+	ret = drm_crtc_init_with_planes(drm, crtc, primary_plane, NULL,
+					&appletbdrm_crtc_funcs, NULL);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to initialize CRTC object\n");
+	drm_crtc_helper_add(crtc, &appletbdrm_crtc_helper_funcs);
+
+	encoder = &adev->encoder;
+	ret = drm_encoder_init(drm, encoder, &appletbdrm_encoder_funcs,
+			       DRM_MODE_ENCODER_DAC, NULL);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to initialize encoder\n");
+	encoder->possible_crtcs = drm_crtc_mask(crtc);
+
+	/*
+	 * The coordinate system used by the device is different from the
+	 * coordinate system of the framebuffer in that the x and y axes are
+	 * swapped, and that the y axis is inverted; so what the device reports
+	 * as the height is actually the width of the framebuffer and vice
+	 * versa
+	 */
+	drm->mode_config.min_width = 0;
+	drm->mode_config.min_height = 0;
+	drm->mode_config.max_width = max(adev->height, DRM_SHADOW_PLANE_MAX_WIDTH);
+	drm->mode_config.max_height = max(adev->width, DRM_SHADOW_PLANE_MAX_HEIGHT);
+	drm->mode_config.preferred_depth = APPLETBDRM_BITS_PER_PIXEL;
+	drm->mode_config.funcs = &appletbdrm_mode_config_funcs;
+
+	adev->mode = (struct drm_display_mode) {
+		DRM_MODE_INIT(60, adev->height, adev->width,
+			      DRM_MODE_RES_MM(adev->height, 218),
+			      DRM_MODE_RES_MM(adev->width, 218))
+	};
+
+	ret = drm_connector_init(drm, connector,
+				 &appletbdrm_connector_funcs, DRM_MODE_CONNECTOR_USB);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to initialize connector\n");
+
+	drm_connector_helper_add(connector, &appletbdrm_connector_helper_funcs);
+
+	ret = drm_connector_set_panel_orientation(connector,
+						  DRM_MODE_PANEL_ORIENTATION_RIGHT_UP);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to set panel orientation\n");
+
+	connector->display_info.non_desktop = true;
+	ret = drm_object_property_set_value(&connector->base,
+					    drm->mode_config.non_desktop_property, true);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to set non-desktop property\n");
+
+	ret = drm_connector_attach_encoder(connector, encoder);
+
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to initialize simple display pipe\n");
+
+	drm_mode_config_reset(drm);
+
+	return 0;
+}
+
+static int appletbdrm_probe(struct usb_interface *intf,
+			    const struct usb_device_id *id)
+{
+	struct usb_endpoint_descriptor *bulk_in, *bulk_out;
+	struct device *dev = &intf->dev;
+	struct appletbdrm_device *adev;
+	struct drm_device *drm;
+	int ret;
+
+	ret = usb_find_common_endpoints(intf->cur_altsetting, &bulk_in, &bulk_out, NULL, NULL);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to find bulk endpoints\n");
+
+	adev = devm_drm_dev_alloc(dev, &appletbdrm_drm_driver, struct appletbdrm_device, drm);
+	if (IS_ERR(adev))
+		return PTR_ERR(adev);
+
+	adev->dev = dev;
+	adev->in_ep = bulk_in->bEndpointAddress;
+	adev->out_ep = bulk_out->bEndpointAddress;
+
+	drm = &adev->drm;
+
+	usb_set_intfdata(intf, adev);
+
+	ret = appletbdrm_get_information(adev);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to get display information\n");
+
+	ret = appletbdrm_signal_readiness(adev);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to signal readiness\n");
+
+	ret = appletbdrm_setup_mode_config(adev);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to setup mode config\n");
+
+	ret = drm_dev_register(drm, 0);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to register DRM device\n");
+
+	ret = appletbdrm_clear_display(adev);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to clear display\n");
+
+	return 0;
+}
+
+static void appletbdrm_disconnect(struct usb_interface *intf)
+{
+	struct appletbdrm_device *adev = usb_get_intfdata(intf);
+	struct drm_device *drm = &adev->drm;
+
+	drm_dev_unplug(drm);
+	drm_atomic_helper_shutdown(drm);
+}
+
+static void appletbdrm_shutdown(struct usb_interface *intf)
+{
+	struct appletbdrm_device *adev = usb_get_intfdata(intf);
+
+	/*
+	 * The framebuffer needs to be cleared on shutdown since its content
+	 * persists across boots
+	 */
+	drm_atomic_helper_shutdown(&adev->drm);
+}
+
+static const struct usb_device_id appletbdrm_usb_id_table[] = {
+	{ USB_DEVICE_INTERFACE_CLASS(0x05ac, 0x8302, USB_CLASS_AUDIO_VIDEO) },
+	{}
+};
+MODULE_DEVICE_TABLE(usb, appletbdrm_usb_id_table);
+
+static struct usb_driver appletbdrm_usb_driver = {
+	.name		= "appletbdrm",
+	.probe		= appletbdrm_probe,
+	.disconnect	= appletbdrm_disconnect,
+	.shutdown	= appletbdrm_shutdown,
+	.id_table	= appletbdrm_usb_id_table,
+};
+module_usb_driver(appletbdrm_usb_driver);
+
+MODULE_AUTHOR("Kerem Karabay <kekrby@gmail.com>");
+MODULE_DESCRIPTION("Apple Touch Bar DRM Driver");
+MODULE_LICENSE("GPL");
-- 
2.43.0

Re: [PATCH v3 3/3] drm/tiny: add driver for Apple Touch Bars in x86 Macs

[andriy.shevchenko]

On Fri, Feb 21, 2025 at 11:37:57AM +0000, Aditya Garg wrote:
> From: Kerem Karabay <kekrby@gmail.com>
> 
> The Touch Bars found on x86 Macs support two USB configurations: one
> where the device presents itself as a HID keyboard and can display
> predefined sets of keys, and one where the operating system has full
> control over what is displayed.
> 
> This commit adds support for the display functionality of the second
> configuration. Functionality for the first configuration has been
> merged in the HID tree.
> 
> Note that this driver has only been tested on T2 Macs, and only includes
> the USB device ID for these devices. Testing on T1 Macs would be
> appreciated.
> 
> Credit goes to Ben (Bingxing) Wang on GitHub [1] for reverse engineering
> most of the protocol.
> 
> [1]: https://github.com/imbushuo/DFRDisplayKm

Use Link tag for this.

> +config DRM_APPLETBDRM
> +	tristate "DRM support for Apple Touch Bars"
> +	depends on DRM && USB && MMU

I dunno if tiny is not only about SPI panels, would be nice to hear somebody
from DRM to confirm that USB ones are okay to have.

> +	select DRM_GEM_SHMEM_HELPER
> +	select DRM_KMS_HELPER
> +	select HID_APPLETB_BL
> +	select HID_MULTITOUCH
> +	help
> +	  Say Y here if you want support for the display of Touch Bars on x86
> +	  MacBook Pros.
> +
> +	  To compile this driver as a module, choose M here: the
> +	  module will be called appletbdrm.

...

> +/*
> + * Apple Touch Bar DRM Driver
> + *
> + * Copyright (c) 2023 Kerem Karabay <kekrby@gmail.com>

No changes in 2024/2025?

> + */

...

> +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

Why? Don't you have a struct device available?

...

> +#include <linux/module.h>
> +#include <linux/unaligned.h>
> +#include <linux/usb.h>

This is way too little list of what you are actually using, please consider
IWYU principle in place.

...

> +#define __APPLETBDRM_MSG_STR4(str4)	((__le32 __force)((str4[0] << 24) | (str4[1] << 16) | (str4[2] << 8) | str4[3]))

Reinventing a wheel from get_unaligned_be32() AFAICS.

...

> +#define drm_to_adev(_drm)		container_of(_drm, struct appletbdrm_device, drm)

+ container_of.h

...

> +struct appletbdrm_msg_request_header {
> +	__le16 unk_00;

+ types.h

> +	__le16 unk_02;
> +	__le32 unk_04;
> +	__le32 unk_08;
> +	__le32 size;
> +} __packed;

Why __packed? Please explain and justify for all the data types that are marked
with this attribute.

...

> +static int appletbdrm_send_request(struct appletbdrm_device *adev,
> +				   struct appletbdrm_msg_request_header *request, size_t size)
> +{
> +	struct usb_device *udev = adev_to_udev(adev);
> +	struct drm_device *drm = &adev->drm;
> +	int ret, actual_size;
> +
> +	ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, adev->out_ep),
> +			   request, size, &actual_size, APPLETBDRM_BULK_MSG_TIMEOUT);
> +	if (ret) {
> +		drm_err(drm, "Failed to send message (%d)\n", ret);
> +		return ret;
> +	}
> +
> +	if (actual_size != size) {
> +		drm_err(drm, "Actual size (%d) doesn't match expected size (%lu)\n",
> +			actual_size, size);
> +		return -EIO;
> +	}
> +
> +	return ret;

	return 0;

Or you are expecting something else here?

> +}

...

> +static int appletbdrm_read_response(struct appletbdrm_device *adev,
> +				    struct appletbdrm_msg_response_header *response,
> +				    size_t size, u32 expected_response)
> +{
> +	struct usb_device *udev = adev_to_udev(adev);
> +	struct drm_device *drm = &adev->drm;
> +	int ret, actual_size;
> +	bool readiness_signal_received = false;
> +
> +retry:
> +	ret = usb_bulk_msg(udev, usb_rcvbulkpipe(udev, adev->in_ep),
> +			   response, size, &actual_size, APPLETBDRM_BULK_MSG_TIMEOUT);
> +	if (ret) {
> +		drm_err(drm, "Failed to read response (%d)\n", ret);
> +		return ret;
> +	}
> +
> +	/*
> +	 * The device responds to the first request sent in a particular
> +	 * timeframe after the USB device configuration is set with a readiness
> +	 * signal, in which case the response should be read again
> +	 */
> +	if (response->msg == APPLETBDRM_MSG_SIGNAL_READINESS) {
> +		if (!readiness_signal_received) {
> +			readiness_signal_received = true;
> +			goto retry;
> +		}
> +
> +		drm_err(drm, "Encountered unexpected readiness signal\n");
> +		return -EIO;
> +	}
> +
> +	if (actual_size != size) {
> +		drm_err(drm, "Actual size (%d) doesn't match expected size (%lu)\n",
> +			actual_size, size);
> +		return -EIO;
> +	}
> +
> +	if (response->msg != expected_response) {
> +		drm_err(drm, "Unexpected response from device (expected %p4ch found %p4ch)\n",
> +			&expected_response, &response->msg);
> +		return -EIO;

For three different cases the same error code, can it be adjusted more to the
situation?

> +	}
> +
> +	return 0;
> +}

> +static int appletbdrm_send_msg(struct appletbdrm_device *adev, u32 msg)
> +{
> +	struct appletbdrm_msg_simple_request *request;
> +	int ret;
> +
> +	request = kzalloc(sizeof(*request), GFP_KERNEL);

+ slab.h

> +	if (!request)
> +		return -ENOMEM;

+ err.h

> +
> +	request->header.unk_00 = cpu_to_le16(2);
> +	request->header.unk_02 = cpu_to_le16(0x1512);
> +	request->header.size = cpu_to_le32(sizeof(*request) - sizeof(request->header));
> +	request->msg = msg;
> +	request->size = request->header.size;
> +
> +	ret = appletbdrm_send_request(adev, &request->header, sizeof(*request));
> +
> +	kfree(request);
> +
> +	return ret;
> +}

...

> +	return drm_rect_width(rect) * drm_rect_height(rect) * (APPLETBDRM_BITS_PER_PIXEL / 8);

BITS_TO_BYTES() ? Will need bits.h IIRC.

...

> +static int appletbdrm_primary_plane_helper_atomic_check(struct drm_plane *plane,
> +						   struct drm_atomic_state *state)
> +{
> +	struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, plane);
> +	struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane);
> +	struct drm_crtc *new_crtc = new_plane_state->crtc;
> +	struct drm_crtc_state *new_crtc_state = NULL;
> +	struct appletbdrm_plane_state *appletbdrm_state = to_appletbdrm_plane_state(new_plane_state);
> +	struct drm_atomic_helper_damage_iter iter;
> +	struct drm_rect damage;
> +	size_t frames_size = 0;
> +	size_t request_size;
> +	int ret;
> +
> +	if (new_crtc)
> +		new_crtc_state = drm_atomic_get_new_crtc_state(state, new_crtc);
> +
> +	ret = drm_atomic_helper_check_plane_state(new_plane_state, new_crtc_state,
> +						  DRM_PLANE_NO_SCALING,
> +						  DRM_PLANE_NO_SCALING,
> +						  false, false);
> +	if (ret)
> +		return ret;

> +	else if (!new_plane_state->visible)

Why 'else'? It's redundant.

> +		return 0;
> +
> +	drm_atomic_helper_damage_iter_init(&iter, old_plane_state, new_plane_state);
> +	drm_atomic_for_each_plane_damage(&iter, &damage) {
> +		frames_size += struct_size((struct appletbdrm_frame *)0, buf, rect_size(&damage));
> +	}
> +
> +	if (!frames_size)
> +		return 0;
> +
> +	request_size = ALIGN(sizeof(struct appletbdrm_fb_request) +
> +		       frames_size +
> +		       sizeof(struct appletbdrm_fb_request_footer), 16);

Missing header for ALIGN().

But have you checked overflow.h for the possibility of using some helper macros
from there? This is what should be usually done for k*alloc() in the kernel.

> +	appletbdrm_state->request = kzalloc(request_size, GFP_KERNEL);
> +
> +	if (!appletbdrm_state->request)
> +		return -ENOMEM;
> +
> +	appletbdrm_state->response = kzalloc(sizeof(*appletbdrm_state->response), GFP_KERNEL);
> +
> +	if (!appletbdrm_state->response)
> +		return -ENOMEM;
> +
> +	appletbdrm_state->request_size = request_size;
> +	appletbdrm_state->frames_size = frames_size;
> +
> +	return 0;
> +}

...

> +static int appletbdrm_flush_damage(struct appletbdrm_device *adev,
> +				   struct drm_plane_state *old_state,
> +				   struct drm_plane_state *state)
> +{
> +	struct appletbdrm_plane_state *appletbdrm_state = to_appletbdrm_plane_state(state);
> +	struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(state);
> +	struct appletbdrm_fb_request_response *response = appletbdrm_state->response;
> +	struct appletbdrm_fb_request_footer *footer;
> +	struct drm_atomic_helper_damage_iter iter;
> +	struct drm_framebuffer *fb = state->fb;
> +	struct appletbdrm_fb_request *request = appletbdrm_state->request;
> +	struct drm_device *drm = &adev->drm;
> +	struct appletbdrm_frame *frame;
> +	u64 timestamp = ktime_get_ns();
> +	struct drm_rect damage;
> +	size_t frames_size = appletbdrm_state->frames_size;
> +	size_t request_size = appletbdrm_state->request_size;
> +	int ret;
> +
> +	if (!frames_size)
> +		return 0;
> +
> +	ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
> +	if (ret) {
> +		drm_err(drm, "Failed to start CPU framebuffer access (%d)\n", ret);

> +		goto end_fb_cpu_access;

Strange. Is it for real that this API requires to be called in both cases for
success and for an error?

> +	}
> +
> +	request->header.unk_00 = cpu_to_le16(2);
> +	request->header.unk_02 = cpu_to_le16(0x12);
> +	request->header.unk_04 = cpu_to_le32(9);
> +	request->header.size = cpu_to_le32(request_size - sizeof(request->header));
> +	request->unk_10 = cpu_to_le16(1);

> +	request->msg_id = timestamp & 0xff;

Why ' & 0xff'?

> +	frame = (struct appletbdrm_frame *)request->data;
> +
> +	drm_atomic_helper_damage_iter_init(&iter, old_state, state);
> +	drm_atomic_for_each_plane_damage(&iter, &damage) {
> +		struct drm_rect dst_clip = state->dst;
> +		struct iosys_map dst = IOSYS_MAP_INIT_VADDR(frame->buf);
> +		u32 buf_size = rect_size(&damage);
> +
> +		if (!drm_rect_intersect(&dst_clip, &damage))
> +			continue;
> +
> +		/*
> +		 * The coordinates need to be translated to the coordinate
> +		 * system the device expects, see the comment in
> +		 * appletbdrm_setup_mode_config
> +		 */
> +		frame->begin_x = cpu_to_le16(damage.y1);
> +		frame->begin_y = cpu_to_le16(adev->height - damage.x2);
> +		frame->width = cpu_to_le16(drm_rect_height(&damage));
> +		frame->height = cpu_to_le16(drm_rect_width(&damage));
> +		frame->buf_size = cpu_to_le32(buf_size);
> +
> +		switch (fb->format->format) {
> +		case DRM_FORMAT_XRGB8888:
> +			drm_fb_xrgb8888_to_bgr888(&dst, NULL, &shadow_plane_state->data[0], fb, &damage, &shadow_plane_state->fmtcnv_state);
> +			break;
> +		default:
> +			drm_fb_memcpy(&dst, NULL, &shadow_plane_state->data[0], fb, &damage);
> +			break;
> +		}
> +
> +		frame = (void *)frame + struct_size(frame, buf, buf_size);

+ overflow.h

> +	}
> +
> +	footer = (struct appletbdrm_fb_request_footer *)&request->data[frames_size];
> +
> +	footer->unk_0c = cpu_to_le32(0xfffe);
> +	footer->unk_1c = cpu_to_le32(0x80001);
> +	footer->unk_34 = cpu_to_le32(0x80002);
> +	footer->unk_4c = cpu_to_le32(0xffff);
> +	footer->timestamp = cpu_to_le64(timestamp);
> +
> +	ret = appletbdrm_send_request(adev, &request->header, request_size);
> +	if (ret)
> +		goto end_fb_cpu_access;
> +
> +	ret = appletbdrm_read_response(adev, &response->header, sizeof(*response),
> +				       APPLETBDRM_MSG_UPDATE_COMPLETE);
> +	if (ret)
> +		goto end_fb_cpu_access;
> +
> +	if (response->timestamp != footer->timestamp) {
> +		drm_err(drm, "Response timestamp (%llu) doesn't match request timestamp (%llu)\n",
> +			le64_to_cpu(response->timestamp), timestamp);
> +		goto end_fb_cpu_access;
> +	}
> +
> +end_fb_cpu_access:
> +	drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
> +
> +	return ret;
> +}

...

> +static void appletbdrm_primary_plane_reset(struct drm_plane *plane)
> +{
> +	struct appletbdrm_plane_state *appletbdrm_state;
> +
> +	WARN_ON(plane->state);

+ bug.h

> +	appletbdrm_state = kzalloc(sizeof(*appletbdrm_state), GFP_KERNEL);
> +	if (!appletbdrm_state)
> +		return;
> +
> +	__drm_gem_reset_shadow_plane(plane, &appletbdrm_state->base);
> +}

...

> +static int appletbdrm_setup_mode_config(struct appletbdrm_device *adev)
> +{
> +	struct drm_connector *connector = &adev->connector;
> +	struct drm_plane *primary_plane;
> +	struct drm_crtc *crtc;
> +	struct drm_encoder *encoder;
> +	struct drm_device *drm = &adev->drm;
> +	struct device *dev = adev->dev;
> +	int ret;
> +
> +	ret = drmm_mode_config_init(drm);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to initialize mode configuration\n");

+ dev_printk.h

> +	primary_plane = &adev->primary_plane;
> +	ret = drm_universal_plane_init(drm, primary_plane, 0,
> +				       &appletbdrm_primary_plane_funcs,
> +				       appletbdrm_primary_plane_formats,
> +				       ARRAY_SIZE(appletbdrm_primary_plane_formats),

+ array_size.h

> +				       NULL,
> +				       DRM_PLANE_TYPE_PRIMARY, NULL);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to initialize universal plane object\n");
> +	drm_plane_helper_add(primary_plane, &appletbdrm_primary_plane_helper_funcs);
> +	drm_plane_enable_fb_damage_clips(primary_plane);
> +
> +	crtc = &adev->crtc;
> +	ret = drm_crtc_init_with_planes(drm, crtc, primary_plane, NULL,
> +					&appletbdrm_crtc_funcs, NULL);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to initialize CRTC object\n");
> +	drm_crtc_helper_add(crtc, &appletbdrm_crtc_helper_funcs);
> +
> +	encoder = &adev->encoder;
> +	ret = drm_encoder_init(drm, encoder, &appletbdrm_encoder_funcs,
> +			       DRM_MODE_ENCODER_DAC, NULL);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to initialize encoder\n");
> +	encoder->possible_crtcs = drm_crtc_mask(crtc);
> +
> +	/*
> +	 * The coordinate system used by the device is different from the
> +	 * coordinate system of the framebuffer in that the x and y axes are
> +	 * swapped, and that the y axis is inverted; so what the device reports
> +	 * as the height is actually the width of the framebuffer and vice
> +	 * versa
> +	 */
> +	drm->mode_config.min_width = 0;
> +	drm->mode_config.min_height = 0;
> +	drm->mode_config.max_width = max(adev->height, DRM_SHADOW_PLANE_MAX_WIDTH);
> +	drm->mode_config.max_height = max(adev->width, DRM_SHADOW_PLANE_MAX_HEIGHT);
> +	drm->mode_config.preferred_depth = APPLETBDRM_BITS_PER_PIXEL;
> +	drm->mode_config.funcs = &appletbdrm_mode_config_funcs;
> +
> +	adev->mode = (struct drm_display_mode) {

Why do you need a compound literal here? Perhaps you want to have that to be
done directly in DRM_MODE_INIT()?

> +		DRM_MODE_INIT(60, adev->height, adev->width,
> +			      DRM_MODE_RES_MM(adev->height, 218),
> +			      DRM_MODE_RES_MM(adev->width, 218))
> +	};
> +
> +	ret = drm_connector_init(drm, connector,
> +				 &appletbdrm_connector_funcs, DRM_MODE_CONNECTOR_USB);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to initialize connector\n");
> +
> +	drm_connector_helper_add(connector, &appletbdrm_connector_helper_funcs);
> +
> +	ret = drm_connector_set_panel_orientation(connector,
> +						  DRM_MODE_PANEL_ORIENTATION_RIGHT_UP);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to set panel orientation\n");
> +
> +	connector->display_info.non_desktop = true;
> +	ret = drm_object_property_set_value(&connector->base,
> +					    drm->mode_config.non_desktop_property, true);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to set non-desktop property\n");
> +
> +	ret = drm_connector_attach_encoder(connector, encoder);
> +
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to initialize simple display pipe\n");
> +
> +	drm_mode_config_reset(drm);
> +
> +	return 0;
> +}

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v3 3/3] drm/tiny: add driver for Apple Touch Bars in x86 Macs

[Aditya Garg]

Hi

> 
> On Fri, Feb 21, 2025 at 11:37:57AM +0000, Aditya Garg wrote:
>> From: Kerem Karabay <kekrby@gmail.com>
>> 
>> The Touch Bars found on x86 Macs support two USB configurations: one
>> where the device presents itself as a HID keyboard and can display
>> predefined sets of keys, and one where the operating system has full
>> control over what is displayed.
>> 
>> This commit adds support for the display functionality of the second
>> configuration. Functionality for the first configuration has been
>> merged in the HID tree.
>> 
>> Note that this driver has only been tested on T2 Macs, and only includes
>> the USB device ID for these devices. Testing on T1 Macs would be
>> appreciated.
>> 
>> Credit goes to Ben (Bingxing) Wang on GitHub [1] for reverse engineering
>> most of the protocol.
>> 
>> [1]: https://github.com/imbushuo/DFRDisplayKm
> 
> Use Link tag for this.
> 
>> +config DRM_APPLETBDRM
>> + tristate "DRM support for Apple Touch Bars"
>> + depends on DRM && USB && MMU
> 
> I dunno if tiny is not only about SPI panels, would be nice to hear somebody
> from DRM to confirm that USB ones are okay to have.
> 
>> + select DRM_GEM_SHMEM_HELPER
>> + select DRM_KMS_HELPER
>> + select HID_APPLETB_BL
>> + select HID_MULTITOUCH
>> + help
>> +   Say Y here if you want support for the display of Touch Bars on x86
>> +   MacBook Pros.
>> +
>> +   To compile this driver as a module, choose M here: the
>> +   module will be called appletbdrm.
> 
> ...
> 
>> +/*
>> + * Apple Touch Bar DRM Driver
>> + *
>> + * Copyright (c) 2023 Kerem Karabay <kekrby@gmail.com>
> 
> No changes in 2024/2025?

From the original author, no. The only changes were the ones requested by Thomas, and they were done by me. I don’t think that qualifies for a copyright here.

> 
>> + */
> 
> ...
> 
>> +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> 
> Why? Don't you have a struct device available?

I’ll remove this
> 
> ...
> 
>> +#include <linux/module.h>
>> +#include <linux/unaligned.h>
>> +#include <linux/usb.h>
> 
> This is way too little list of what you are actually using, please consider
> IWYU principle in place.

Alright (and thanks for pointing out the missing headers below).
> 
> ...
> 
>> +#define __APPLETBDRM_MSG_STR4(str4) ((__le32 __force)((str4[0] << 24) | (str4[1] << 16) | (str4[2] << 8) | str4[3]))
> 
> Reinventing a wheel from get_unaligned_be32() AFAICS.
> 
> ...
> 
>> +#define drm_to_adev(_drm) container_of(_drm, struct appletbdrm_device, drm)
> 
> + container_of.h
> 
> ...
> 
>> +struct appletbdrm_msg_request_header {
>> + __le16 unk_00;
> 
> + types.h
> 
>> + __le16 unk_02;
>> + __le32 unk_04;
>> + __le32 unk_08;
>> + __le32 size;
>> +} __packed;
> 
> Why __packed? Please explain and justify for all the data types that are marked
> with this attribute.

Just following the original Windows driver here (#pragma pack) :

https://github.com/imbushuo/DFRDisplayKm/blob/master/src/DFRDisplayKm/include/DFRHostIo.h

IMO these structures are used for communication with the Touch Bar over USB. The hardware expects a very specific layout for the data it receives and sends. If the compiler were to insert padding for alignment, it would break the communication protocol because the fields would not be in the expected positions.

I tried removing __packed btw and driver no longer works.
> 
> ...
> 
>> +static int appletbdrm_send_request(struct appletbdrm_device *adev,
>> +    struct appletbdrm_msg_request_header *request, size_t size)
>> +{
>> + struct usb_device *udev = adev_to_udev(adev);
>> + struct drm_device *drm = &adev->drm;
>> + int ret, actual_size;
>> +
>> + ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, adev->out_ep),
>> +    request, size, &actual_size, APPLETBDRM_BULK_MSG_TIMEOUT);
>> + if (ret) {
>> + drm_err(drm, "Failed to send message (%d)\n", ret);
>> + return ret;
>> + }
>> +
>> + if (actual_size != size) {
>> + drm_err(drm, "Actual size (%d) doesn't match expected size (%lu)\n",
>> + actual_size, size);
>> + return -EIO;
>> + }
>> +
>> + return ret;
> 
> return 0;
> 
> Or you are expecting something else here?

Will change to return 0;
> 
>> +}
> 
> ...
> 
>> +static int appletbdrm_read_response(struct appletbdrm_device *adev,
>> +     struct appletbdrm_msg_response_header *response,
>> +     size_t size, u32 expected_response)
>> +{
>> + struct usb_device *udev = adev_to_udev(adev);
>> + struct drm_device *drm = &adev->drm;
>> + int ret, actual_size;
>> + bool readiness_signal_received = false;
>> +
>> +retry:
>> + ret = usb_bulk_msg(udev, usb_rcvbulkpipe(udev, adev->in_ep),
>> +    response, size, &actual_size, APPLETBDRM_BULK_MSG_TIMEOUT);
>> + if (ret) {
>> + drm_err(drm, "Failed to read response (%d)\n", ret);
>> + return ret;
>> + }
>> +
>> + /*
>> +  * The device responds to the first request sent in a particular
>> +  * timeframe after the USB device configuration is set with a readiness
>> +  * signal, in which case the response should be read again
>> +  */
>> + if (response->msg == APPLETBDRM_MSG_SIGNAL_READINESS) {
>> + if (!readiness_signal_received) {
>> + readiness_signal_received = true;
>> + goto retry;
>> + }
>> +
>> + drm_err(drm, "Encountered unexpected readiness signal\n");
>> + return -EIO;
>> + }
>> +
>> + if (actual_size != size) {
>> + drm_err(drm, "Actual size (%d) doesn't match expected size (%lu)\n",
>> + actual_size, size);
>> + return -EIO;
>> + }
>> +
>> + if (response->msg != expected_response) {
>> + drm_err(drm, "Unexpected response from device (expected %p4ch found %p4ch)\n",
>> + &expected_response, &response->msg);
>> + return -EIO;
> 
> For three different cases the same error code, can it be adjusted more to the
> situation?

All these are I/O errors, you got any suggestion?
> 
>> + }
>> +
>> + return 0;
>> +}
> 
>> +static int appletbdrm_send_msg(struct appletbdrm_device *adev, u32 msg)
>> +{
>> + struct appletbdrm_msg_simple_request *request;
>> + int ret;
>> +
>> + request = kzalloc(sizeof(*request), GFP_KERNEL);
> 
> + slab.h
> 
>> + if (!request)
>> + return -ENOMEM;
> 
> + err.h
> 
>> +
>> + request->header.unk_00 = cpu_to_le16(2);
>> + request->header.unk_02 = cpu_to_le16(0x1512);
>> + request->header.size = cpu_to_le32(sizeof(*request) - sizeof(request->header));
>> + request->msg = msg;
>> + request->size = request->header.size;
>> +
>> + ret = appletbdrm_send_request(adev, &request->header, sizeof(*request));
>> +
>> + kfree(request);
>> +
>> + return ret;
>> +}
> 
> ...
> 
>> + return drm_rect_width(rect) * drm_rect_height(rect) * (APPLETBDRM_BITS_PER_PIXEL / 8);
> 
> BITS_TO_BYTES() ? Will need bits.h IIRC.

bitops.h (will add)

https://github.com/torvalds/linux/blob/master/include/linux/bitops.h#L15
> 
> ...
> 
>> +static int appletbdrm_primary_plane_helper_atomic_check(struct drm_plane *plane,
>> +    struct drm_atomic_state *state)
>> +{
>> + struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, plane);
>> + struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane);
>> + struct drm_crtc *new_crtc = new_plane_state->crtc;
>> + struct drm_crtc_state *new_crtc_state = NULL;
>> + struct appletbdrm_plane_state *appletbdrm_state = to_appletbdrm_plane_state(new_plane_state);
>> + struct drm_atomic_helper_damage_iter iter;
>> + struct drm_rect damage;
>> + size_t frames_size = 0;
>> + size_t request_size;
>> + int ret;
>> +
>> + if (new_crtc)
>> + new_crtc_state = drm_atomic_get_new_crtc_state(state, new_crtc);
>> +
>> + ret = drm_atomic_helper_check_plane_state(new_plane_state, new_crtc_state,
>> +   DRM_PLANE_NO_SCALING,
>> +   DRM_PLANE_NO_SCALING,
>> +   false, false);
>> + if (ret)
>> + return ret;
> 
>> + else if (!new_plane_state->visible)
> 
> Why 'else'? It's redundant.

I’ve just followed what other drm drivers are doing here:

https://elixir.bootlin.com/linux/v6.13.3/source/drivers/gpu/drm/tiny/bochs.c#L436
https://elixir.bootlin.com/linux/v6.13.3/source/drivers/gpu/drm/tiny/cirrus.c#L363

And plenty more

I won’t mind removing else. You want that?
> 
>> + return 0;
>> +
>> + drm_atomic_helper_damage_iter_init(&iter, old_plane_state, new_plane_state);
>> + drm_atomic_for_each_plane_damage(&iter, &damage) {
>> + frames_size += struct_size((struct appletbdrm_frame *)0, buf, rect_size(&damage));
>> + }
>> +
>> + if (!frames_size)
>> + return 0;
>> +
>> + request_size = ALIGN(sizeof(struct appletbdrm_fb_request) +
>> +        frames_size +
>> +        sizeof(struct appletbdrm_fb_request_footer), 16);
> 
> Missing header for ALIGN().
> 
> But have you checked overflow.h for the possibility of using some helper macros
> from there? This is what should be usually done for k*alloc() in the kernel.

I don’t really think we need a macro here.
> 
>> + appletbdrm_state->request = kzalloc(request_size, GFP_KERNEL);
>> +
>> + if (!appletbdrm_state->request)
>> + return -ENOMEM;
>> +
>> + appletbdrm_state->response = kzalloc(sizeof(*appletbdrm_state->response), GFP_KERNEL);
>> +
>> + if (!appletbdrm_state->response)
>> + return -ENOMEM;
>> +
>> + appletbdrm_state->request_size = request_size;
>> + appletbdrm_state->frames_size = frames_size;
>> +
>> + return 0;
>> +}
> 
> ...
> 
>> +static int appletbdrm_flush_damage(struct appletbdrm_device *adev,
>> +    struct drm_plane_state *old_state,
>> +    struct drm_plane_state *state)
>> +{
>> + struct appletbdrm_plane_state *appletbdrm_state = to_appletbdrm_plane_state(state);
>> + struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(state);
>> + struct appletbdrm_fb_request_response *response = appletbdrm_state->response;
>> + struct appletbdrm_fb_request_footer *footer;
>> + struct drm_atomic_helper_damage_iter iter;
>> + struct drm_framebuffer *fb = state->fb;
>> + struct appletbdrm_fb_request *request = appletbdrm_state->request;
>> + struct drm_device *drm = &adev->drm;
>> + struct appletbdrm_frame *frame;
>> + u64 timestamp = ktime_get_ns();
>> + struct drm_rect damage;
>> + size_t frames_size = appletbdrm_state->frames_size;
>> + size_t request_size = appletbdrm_state->request_size;
>> + int ret;
>> +
>> + if (!frames_size)
>> + return 0;
>> +
>> + ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
>> + if (ret) {
>> + drm_err(drm, "Failed to start CPU framebuffer access (%d)\n", ret);
> 
>> + goto end_fb_cpu_access;
> 
> Strange. Is it for real that this API requires to be called in both cases for
> success and for an error?

Yes

https://elixir.bootlin.com/linux/v6.13.3/source/drivers/gpu/drm/tiny/ofdrm.c#L839
> 
>> + }
>> +
>> + request->header.unk_00 = cpu_to_le16(2);
>> + request->header.unk_02 = cpu_to_le16(0x12);
>> + request->header.unk_04 = cpu_to_le32(9);
>> + request->header.size = cpu_to_le32(request_size - sizeof(request->header));
>> + request->unk_10 = cpu_to_le16(1);
> 
>> + request->msg_id = timestamp & 0xff;
> 
> Why ' & 0xff'?

https://github.com/imbushuo/DFRDisplayKm/blob/master/src/DFRDisplayKm/DfrDisplay.c#L147

> 
>> + frame = (struct appletbdrm_frame *)request->data;
>> +
>> + drm_atomic_helper_damage_iter_init(&iter, old_state, state);
>> + drm_atomic_for_each_plane_damage(&iter, &damage) {
>> + struct drm_rect dst_clip = state->dst;
>> + struct iosys_map dst = IOSYS_MAP_INIT_VADDR(frame->buf);
>> + u32 buf_size = rect_size(&damage);
>> +
>> + if (!drm_rect_intersect(&dst_clip, &damage))
>> + continue;
>> +
>> + /*
>> +  * The coordinates need to be translated to the coordinate
>> +  * system the device expects, see the comment in
>> +  * appletbdrm_setup_mode_config
>> +  */
>> + frame->begin_x = cpu_to_le16(damage.y1);
>> + frame->begin_y = cpu_to_le16(adev->height - damage.x2);
>> + frame->width = cpu_to_le16(drm_rect_height(&damage));
>> + frame->height = cpu_to_le16(drm_rect_width(&damage));
>> + frame->buf_size = cpu_to_le32(buf_size);
>> +
>> + switch (fb->format->format) {
>> + case DRM_FORMAT_XRGB8888:
>> + drm_fb_xrgb8888_to_bgr888(&dst, NULL, &shadow_plane_state->data[0], fb, &damage, &shadow_plane_state->fmtcnv_state);
>> + break;
>> + default:
>> + drm_fb_memcpy(&dst, NULL, &shadow_plane_state->data[0], fb, &damage);
>> + break;
>> + }
>> +
>> + frame = (void *)frame + struct_size(frame, buf, buf_size);
> 
> + overflow.h
> 
>> + }
>> +
>> + footer = (struct appletbdrm_fb_request_footer *)&request->data[frames_size];
>> +
>> + footer->unk_0c = cpu_to_le32(0xfffe);
>> + footer->unk_1c = cpu_to_le32(0x80001);
>> + footer->unk_34 = cpu_to_le32(0x80002);
>> + footer->unk_4c = cpu_to_le32(0xffff);
>> + footer->timestamp = cpu_to_le64(timestamp);
>> +
>> + ret = appletbdrm_send_request(adev, &request->header, request_size);
>> + if (ret)
>> + goto end_fb_cpu_access;
>> +
>> + ret = appletbdrm_read_response(adev, &response->header, sizeof(*response),
>> +        APPLETBDRM_MSG_UPDATE_COMPLETE);
>> + if (ret)
>> + goto end_fb_cpu_access;
>> +
>> + if (response->timestamp != footer->timestamp) {
>> + drm_err(drm, "Response timestamp (%llu) doesn't match request timestamp (%llu)\n",
>> + le64_to_cpu(response->timestamp), timestamp);
>> + goto end_fb_cpu_access;
>> + }
>> +
>> +end_fb_cpu_access:
>> + drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
>> +
>> + return ret;
>> +}
> 
> ...
> 
>> +static void appletbdrm_primary_plane_reset(struct drm_plane *plane)
>> +{
>> + struct appletbdrm_plane_state *appletbdrm_state;
>> +
>> + WARN_ON(plane->state);
> 
> + bug.h
> 
>> + appletbdrm_state = kzalloc(sizeof(*appletbdrm_state), GFP_KERNEL);
>> + if (!appletbdrm_state)
>> + return;
>> +
>> + __drm_gem_reset_shadow_plane(plane, &appletbdrm_state->base);
>> +}
> 
> ...
> 
>> +static int appletbdrm_setup_mode_config(struct appletbdrm_device *adev)
>> +{
>> + struct drm_connector *connector = &adev->connector;
>> + struct drm_plane *primary_plane;
>> + struct drm_crtc *crtc;
>> + struct drm_encoder *encoder;
>> + struct drm_device *drm = &adev->drm;
>> + struct device *dev = adev->dev;
>> + int ret;
>> +
>> + ret = drmm_mode_config_init(drm);
>> + if (ret)
>> + return dev_err_probe(dev, ret, "Failed to initialize mode configuration\n");
> 
> + dev_printk.h
> 
>> + primary_plane = &adev->primary_plane;
>> + ret = drm_universal_plane_init(drm, primary_plane, 0,
>> +        &appletbdrm_primary_plane_funcs,
>> +        appletbdrm_primary_plane_formats,
>> +        ARRAY_SIZE(appletbdrm_primary_plane_formats),
> 
> + array_size.h
> 
>> +        NULL,
>> +        DRM_PLANE_TYPE_PRIMARY, NULL);
>> + if (ret)
>> + return dev_err_probe(dev, ret, "Failed to initialize universal plane object\n");
>> + drm_plane_helper_add(primary_plane, &appletbdrm_primary_plane_helper_funcs);
>> + drm_plane_enable_fb_damage_clips(primary_plane);
>> +
>> + crtc = &adev->crtc;
>> + ret = drm_crtc_init_with_planes(drm, crtc, primary_plane, NULL,
>> + &appletbdrm_crtc_funcs, NULL);
>> + if (ret)
>> + return dev_err_probe(dev, ret, "Failed to initialize CRTC object\n");
>> + drm_crtc_helper_add(crtc, &appletbdrm_crtc_helper_funcs);
>> +
>> + encoder = &adev->encoder;
>> + ret = drm_encoder_init(drm, encoder, &appletbdrm_encoder_funcs,
>> +        DRM_MODE_ENCODER_DAC, NULL);
>> + if (ret)
>> + return dev_err_probe(dev, ret, "Failed to initialize encoder\n");
>> + encoder->possible_crtcs = drm_crtc_mask(crtc);
>> +
>> + /*
>> +  * The coordinate system used by the device is different from the
>> +  * coordinate system of the framebuffer in that the x and y axes are
>> +  * swapped, and that the y axis is inverted; so what the device reports
>> +  * as the height is actually the width of the framebuffer and vice
>> +  * versa
>> +  */
>> + drm->mode_config.min_width = 0;
>> + drm->mode_config.min_height = 0;
>> + drm->mode_config.max_width = max(adev->height, DRM_SHADOW_PLANE_MAX_WIDTH);
>> + drm->mode_config.max_height = max(adev->width, DRM_SHADOW_PLANE_MAX_HEIGHT);
>> + drm->mode_config.preferred_depth = APPLETBDRM_BITS_PER_PIXEL;
>> + drm->mode_config.funcs = &appletbdrm_mode_config_funcs;
>> +
>> + adev->mode = (struct drm_display_mode) {
> 
> Why do you need a compound literal here? Perhaps you want to have that to be
> done directly in DRM_MODE_INIT()?

I really don’t find this as an issue. You want me to declare another structure, basically this?:

struct drm_display_mode mode = {
DRM_MODE_INIT(60, adev->height, adev->width,
DRM_MODE_RES_MM(adev->height, 218),
DRM_MODE_RES_MM(adev->width, 218))
};
adev->mode = mode;

> 
>> + DRM_MODE_INIT(60, adev->height, adev->width,
>> +       DRM_MODE_RES_MM(adev->height, 218),
>> +       DRM_MODE_RES_MM(adev->width, 218))
>> + };
>> +
>> + ret = drm_connector_init(drm, connector,
>> +  &appletbdrm_connector_funcs, DRM_MODE_CONNECTOR_USB);
>> + if (ret)
>> + return dev_err_probe(dev, ret, "Failed to initialize connector\n");
>> +
>> + drm_connector_helper_add(connector, &appletbdrm_connector_helper_funcs);
>> +
>> + ret = drm_connector_set_panel_orientation(connector,
>> +   DRM_MODE_PANEL_ORIENTATION_RIGHT_UP);
>> + if (ret)
>> + return dev_err_probe(dev, ret, "Failed to set panel orientation\n");
>> +
>> + connector->display_info.non_desktop = true;
>> + ret = drm_object_property_set_value(&connector->base,
>> +     drm->mode_config.non_desktop_property, true);
>> + if (ret)
>> + return dev_err_probe(dev, ret, "Failed to set non-desktop property\n");
>> +
>> + ret = drm_connector_attach_encoder(connector, encoder);
>> +
>> + if (ret)
>> + return dev_err_probe(dev, ret, "Failed to initialize simple display pipe\n");
>> +
>> + drm_mode_config_reset(drm);
>> +
>> + return 0;
>> +}

Thanks
Aditya

Re: [PATCH v3 3/3] drm/tiny: add driver for Apple Touch Bars in x86 Macs

[andriy.shevchenko]

On Fri, Feb 21, 2025 at 07:13:06PM +0000, Aditya Garg wrote:
> > On Fri, Feb 21, 2025 at 11:37:57AM +0000, Aditya Garg wrote:

...

> >> +} __packed;
> > 
> > Why __packed? Please explain and justify for all the data types that are marked
> > with this attribute.
> 
> Just following the original Windows driver here (#pragma pack) :
> 
> https://github.com/imbushuo/DFRDisplayKm/blob/master/src/DFRDisplayKm/include/DFRHostIo.h
> 
> IMO these structures are used for communication with the Touch Bar over USB.
> The hardware expects a very specific layout for the data it receives and
> sends. If the compiler were to insert padding for alignment, it would break
> the communication protocol because the fields would not be in the expected
> positions.

What padding, please? Why TCP UAPI headers do not have these attributes?
Think about it, and think about what actually __packed does and how it affects
(badly) the code generation. Otherwise it looks like a cargo cult.

> I tried removing __packed btw and driver no longer works.

So, you need to find a justification why. But definitely not due to padding in
many of them. They can go without __packed as they are naturally aligned.

...

> >> + if (response->msg == APPLETBDRM_MSG_SIGNAL_READINESS) {
> >> + if (!readiness_signal_received) {
> >> + readiness_signal_received = true;
> >> + goto retry;
> >> + }
> >> +
> >> + drm_err(drm, "Encountered unexpected readiness signal\n");
> >> + return -EIO;
> >> + }
> >> +
> >> + if (actual_size != size) {
> >> + drm_err(drm, "Actual size (%d) doesn't match expected size (%lu)\n",
> >> + actual_size, size);
> >> + return -EIO;
> >> + }
> >> +
> >> + if (response->msg != expected_response) {
> >> + drm_err(drm, "Unexpected response from device (expected %p4ch found %p4ch)\n",
> >> + &expected_response, &response->msg);
> >> + return -EIO;
> > 
> > For three different cases the same error code, can it be adjusted more to the
> > situation?
> 
> All these are I/O errors, you got any suggestion?

Your email client mangled the code so badly that it's hard to read. But I would
suggest to use -EINTR in the first case, and -EBADMSG. But also you may consider
-EPROTO.

> >> + }

...

> >> + if (ret)
> >> + return ret;
> > 
> >> + else if (!new_plane_state->visible)
> > 
> > Why 'else'? It's redundant.
> 
> I’ve just followed what other drm drivers are doing here:
> 
> https://elixir.bootlin.com/linux/v6.13.3/source/drivers/gpu/drm/tiny/bochs.c#L436
> https://elixir.bootlin.com/linux/v6.13.3/source/drivers/gpu/drm/tiny/cirrus.c#L363
> 
> And plenty more

A bad example is still a bad example. 'else' is simply redundant in this
case and add a noisy to the code.

> I won’t mind removing else. You want that?

Sure.

...

> >> + request_size = ALIGN(sizeof(struct appletbdrm_fb_request) +
> >> +        frames_size +
> >> +        sizeof(struct appletbdrm_fb_request_footer), 16);
> > 
> > Missing header for ALIGN().
> > 
> > But have you checked overflow.h for the possibility of using some helper macros
> > from there? This is what should be usually done for k*alloc() in the kernel.
> 
> I don’t really think we need a macro here.

Hmm... is frames_size known to be in a guaranteed range to make sure no
potential overflow happens?

> >> + appletbdrm_state->request = kzalloc(request_size, GFP_KERNEL);
> >> +
> >> + if (!appletbdrm_state->request)
> >> + return -ENOMEM;

...

> >> + request->msg_id = timestamp & 0xff;
> > 
> > Why ' & 0xff'?
> 
> https://github.com/imbushuo/DFRDisplayKm/blob/master/src/DFRDisplayKm/DfrDisplay.c#L147

This is not an answer.
Why do you need this here? Isn't the type of msg_id enough?

...

> >> + adev->mode = (struct drm_display_mode) {
> > 
> > Why do you need a compound literal here? Perhaps you want to have that to be
> > done directly in DRM_MODE_INIT()?
> 
> I really don’t find this as an issue. You want me to declare another structure, basically this?:

Nope, I'm asking if the DRM_MODE_INIT() is done in a way that it only can be
used for the static data. Seems like the case. Have you tried to convert
DRM_MODE_INIT() to be always a compound literal? Does it break things?

> struct drm_display_mode mode = {
> DRM_MODE_INIT(60, adev->height, adev->width,
> DRM_MODE_RES_MM(adev->height, 218),
> DRM_MODE_RES_MM(adev->width, 218))
> };
> adev->mode = mode;
> 
> >> + DRM_MODE_INIT(60, adev->height, adev->width,
> >> +       DRM_MODE_RES_MM(adev->height, 218),
> >> +       DRM_MODE_RES_MM(adev->width, 218))
> >> + };

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v3 3/3] drm/tiny: add driver for Apple Touch Bars in x86 Macs

[Aditya Garg]

> What padding, please? Why TCP UAPI headers do not have these attributes?
> Think about it, and think about what actually __packed does and how it affects
> (badly) the code generation. Otherwise it looks like a cargo cult.
> 
>> I tried removing __packed btw and driver no longer works.
> 
> So, you need to find a justification why. But definitely not due to padding in
> many of them. They can go without __packed as they are naturally aligned.

Alright, I did some debugging, basically printk sizeof(struct). Did it for both packed and unpacked with the following results:

Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_request_header is 16
Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_request_header_unpacked is 16

Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_response_header is 20
Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_response_header_unpacked is 20

Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_simple_request is 32
Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_simple_request_unpacked is 32

Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_information is 65
Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_information_unpacked is 68

Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_frame is 12
Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_frame_unpacked is 12

Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_fb_request_footer is 80
Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_fb_request_footer_unpacked is 80

Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_fb_request is 48
Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_fb_request_unpacked is 48

Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_fb_request_response is 40
Feb 22 13:02:04 MacBook kernel: size of struct appletbdrm_fb_request_response_unpacked is 40

So, the difference in sizeof in unpacked and packed is only in appletbdrm_msg_information. So, I kept this packed, and removed it from others. The Touch Bar still works.

So maybe keep just this packed?
> 
> 
> 
> ...
> 
>>>> + if (response->msg == APPLETBDRM_MSG_SIGNAL_READINESS) {
>>>> + if (!readiness_signal_received) {
>>>> + readiness_signal_received = true;
>>>> + goto retry;
>>>> + }
>>>> +
>>>> + drm_err(drm, "Encountered unexpected readiness signal\n");
>>>> + return -EIO;
>>>> + }
>>>> +
>>>> + if (actual_size != size) {
>>>> + drm_err(drm, "Actual size (%d) doesn't match expected size (%lu)\n",
>>>> + actual_size, size);
>>>> + return -EIO;
>>>> + }
>>>> +
>>>> + if (response->msg != expected_response) {
>>>> + drm_err(drm, "Unexpected response from device (expected %p4ch found %p4ch)\n",
>>>> + &expected_response, &response->msg);
>>>> + return -EIO;
>>> 
>>> For three different cases the same error code, can it be adjusted more to the
>>> situation?
>> 
>> All these are I/O errors, you got any suggestion?
> 
> Your email client mangled the code so badly that it's hard to read. But I would
> suggest to use -EINTR in the first case, and -EBADMSG. But also you may consider
> -EPROTO.
Thanks
> 
>>>> + }
> 
> ...
> 
>>>> + if (ret)
>>>> + return ret;
>>> 
>>>> + else if (!new_plane_state->visible)
>>> 
>>> Why 'else'? It's redundant.
>> 
>> I’ve just followed what other drm drivers are doing here:
>> 
>> https://elixir.bootlin.com/linux/v6.13.3/source/drivers/gpu/drm/tiny/bochs.c#L436
>> https://elixir.bootlin.com/linux/v6.13.3/source/drivers/gpu/drm/tiny/cirrus.c#L363
>> 
>> And plenty more
> 
> A bad example is still a bad example. 'else' is simply redundant in this
> case and add a noisy to the code.
> 
>> I won’t mind removing else. You want that?
> 
> Sure.
> 
> ...
> 
>>>> + request_size = ALIGN(sizeof(struct appletbdrm_fb_request) +
>>>> +        frames_size +
>>>> +        sizeof(struct appletbdrm_fb_request_footer), 16);
>>> 
>>> Missing header for ALIGN().
>>> 
>>> But have you checked overflow.h for the possibility of using some helper macros
>>> from there? This is what should be usually done for k*alloc() in the kernel.
>> 
>> I don’t really think we need a macro here.
> 
> Hmm... is frames_size known to be in a guaranteed range to make sure no
> potential overflow happens?

I don’t really find any cause of potential overflow.


> 
>>>> + appletbdrm_state->request = kzalloc(request_size, GFP_KERNEL);
>>>> +
>>>> + if (!appletbdrm_state->request)
>>>> + return -ENOMEM;
> 
> ...
> 
>>>> + request->msg_id = timestamp & 0xff;
>>> 
>>> Why ' & 0xff'?
>> 
>> https://github.com/imbushuo/DFRDisplayKm/blob/master/src/DFRDisplayKm/DfrDisplay.c#L147
> 
> This is not an answer.
> Why do you need this here? Isn't the type of msg_id enough?

Hmm, I double checked this. msg_id is u8 in the Linux port so would anyways never exceed 0xff. I’ll remove this.
Its different in the Windows driver.
> 
> ...
> 
>>>> + adev->mode = (struct drm_display_mode) {
>>> 
>>> Why do you need a compound literal here? Perhaps you want to have that to be
>>> done directly in DRM_MODE_INIT()?
>> 
>> I really don’t find this as an issue. You want me to declare another structure, basically this?:
> 
> Nope, I'm asking if the DRM_MODE_INIT() is done in a way that it only can be
> used for the static data. Seems like the case. Have you tried to convert
> DRM_MODE_INIT() to be always a compound literal? Does it break things?

Seems to be breaking things.
> 
>> struct drm_display_mode mode = {
>> DRM_MODE_INIT(60, adev->height, adev->width,
>> DRM_MODE_RES_MM(adev->height, 218),
>> DRM_MODE_RES_MM(adev->width, 218))
>> };
>> adev->mode = mode;
>> 
>>>> + DRM_MODE_INIT(60, adev->height, adev->width,
>>>> +       DRM_MODE_RES_MM(adev->height, 218),
>>>> +       DRM_MODE_RES_MM(adev->width, 218))
>>>> + };
> 
> -- 
> With Best Regards,
> Andy Shevchenko
> 
> 

Re: [PATCH v3 3/3] drm/tiny: add driver for Apple Touch Bars in x86 Macs

[Aditya Garg]

> On 22 Feb 2025, at 2:37 PM, Aditya Garg <gargaditya08@live.com> wrote:
> 
>> 
>> What padding, please? Why TCP UAPI headers do not have these attributes?
>> Think about it, and think about what actually __packed does and how it affects
>> (badly) the code generation. Otherwise it looks like a cargo cult.
>> 
>>> I tried removing __packed btw and driver no longer works.
>> 
>> So, you need to find a justification why. But definitely not due to padding in
>> many of them. They can go without __packed as they are naturally aligned.
> 
> Alright, I did some debugging, basically printk sizeof(struct). Did it for both packed and unpacked with the following results:
> 
> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_request_header is 16
> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_request_header_unpacked is 16
> 
> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_response_header is 20
> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_response_header_unpacked is 20
> 
> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_simple_request is 32
> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_simple_request_unpacked is 32
> 
> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_information is 65
> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_information_unpacked is 68
> 
> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_frame is 12
> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_frame_unpacked is 12
> 
> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_fb_request_footer is 80
> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_fb_request_footer_unpacked is 80
> 
> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_fb_request is 48
> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_fb_request_unpacked is 48
> 
> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_fb_request_response is 40
> Feb 22 13:02:04 MacBook kernel: size of struct appletbdrm_fb_request_response_unpacked is 40
> 
> So, the difference in sizeof in unpacked and packed is only in appletbdrm_msg_information. So, I kept this packed, and removed it from others. The Touch Bar still works.
> 
> So maybe keep just this packed?

And for justification why driver was not working, with appletbdrm_msg_information not packed is because sizeof(struct appletbdrm_msg_information) is being used in kzalloc in the driver. Similar is the case for most other __packed structs.

Maybe the author wanted to keep this value consistent across various compiler options? I don’t think CPU architecture really matters here though since this driver is exclusively for x86_64 Intel Macs.

Re: [PATCH v3 3/3] drm/tiny: add driver for Apple Touch Bars in x86 Macs

[Aditya Garg]

> On 22 Feb 2025, at 5:52 PM, Aditya Garg <gargaditya08@live.com> wrote:
> 
> 
> 
>> On 22 Feb 2025, at 2:37 PM, Aditya Garg <gargaditya08@live.com> wrote:
>> 
>>> 
>>> What padding, please? Why TCP UAPI headers do not have these attributes?
>>> Think about it, and think about what actually __packed does and how it affects
>>> (badly) the code generation. Otherwise it looks like a cargo cult.
>>> 
>>>> I tried removing __packed btw and driver no longer works.
>>> 
>>> So, you need to find a justification why. But definitely not due to padding in
>>> many of them. They can go without __packed as they are naturally aligned.
>> 
>> Alright, I did some debugging, basically printk sizeof(struct). Did it for both packed and unpacked with the following results:
>> 
>> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_request_header is 16
>> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_request_header_unpacked is 16
>> 
>> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_response_header is 20
>> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_response_header_unpacked is 20
>> 
>> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_simple_request is 32
>> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_simple_request_unpacked is 32
>> 
>> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_information is 65
>> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_information_unpacked is 68
>> 
>> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_frame is 12
>> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_frame_unpacked is 12
>> 
>> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_fb_request_footer is 80
>> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_fb_request_footer_unpacked is 80
>> 
>> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_fb_request is 48
>> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_fb_request_unpacked is 48
>> 
>> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_fb_request_response is 40
>> Feb 22 13:02:04 MacBook kernel: size of struct appletbdrm_fb_request_response_unpacked is 40
>> 
>> So, the difference in sizeof in unpacked and packed is only in appletbdrm_msg_information. So, I kept this packed, and removed it from others. The Touch Bar still works.
>> 
>> So maybe keep just this packed?
> 
> And for justification why driver was not working, with appletbdrm_msg_information not packed is because sizeof(struct appletbdrm_msg_information) is being used in kzalloc in the driver. Similar is the case for most other __packed structs.

I tried to debug a bit more and its not really the kzalloc logic, rather its the USB bit that’s causing the issue:

Code:

static int appletbdrm_read_response(struct appletbdrm_device *adev,
				    struct appletbdrm_msg_response_header *response,
				    size_t size, __le32 expected_response)
{
	struct usb_device *udev = adev_to_udev(adev);
	struct drm_device *drm = &adev->drm;
	int ret, actual_size;
	bool readiness_signal_received = false;

retry:
	ret = usb_bulk_msg(udev, usb_rcvbulkpipe(udev, adev->in_ep),
			   response, size, &actual_size, APPLETBDRM_BULK_MSG_TIMEOUT);
	if (ret) {
		drm_err(drm, "Failed to read response (%d)\n", ret);
		return ret;
	}

	/*
	 * The device responds to the first request sent in a particular
	 * timeframe after the USB device configuration is set with a readiness
	 * signal, in which case the response should be read again
	 */
	if (response->msg == APPLETBDRM_MSG_SIGNAL_READINESS) {
		if (!readiness_signal_received) {
			readiness_signal_received = true;
			goto retry;
		}

		drm_err(drm, "Encountered unexpected readiness signal\n");
		return -EIO;
	}

	if (actual_size != size) {
		drm_err(drm, "Actual size (%d) doesn't match expected size (%lu)\n",
			actual_size, size);
		return -EIO;
	}

	if (response->msg != expected_response) {
		drm_err(drm, "Unexpected response from device (expected %p4ch found %p4ch)\n",
			&expected_response, &response->msg);
		return -EIO;
	}

	return 0;
}

Error:

Feb 23 20:00:29 MacBook kernel: appletbdrm 7-6:2.1: [drm] *ERROR* Actual size (65) doesn't match expected size (68)

So IMO, we still need this struct to remain packed.

> 
> Maybe the author wanted to keep this value consistent across various compiler options? I don’t think CPU architecture really matters here though since this driver is exclusively for x86_64 Intel Macs.

Re: [PATCH v3 3/3] drm/tiny: add driver for Apple Touch Bars in x86 Macs

[Thomas Zimmermann]

Hi

Am 22.02.25 um 10:07 schrieb Aditya Garg:
>> What padding, please? Why TCP UAPI headers do not have these attributes?
>> Think about it, and think about what actually __packed does and how it affects
>> (badly) the code generation. Otherwise it looks like a cargo cult.
>>
>>> I tried removing __packed btw and driver no longer works.
>> So, you need to find a justification why. But definitely not due to padding in
>> many of them. They can go without __packed as they are naturally aligned.
> Alright, I did some debugging, basically printk sizeof(struct). Did it for both packed and unpacked with the following results:
>
> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_request_header is 16
> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_request_header_unpacked is 16
>
> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_response_header is 20
> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_response_header_unpacked is 20
>
> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_simple_request is 32
> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_simple_request_unpacked is 32
>
> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_information is 65
> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_information_unpacked is 68

In the unpacked version, there is a 3-byte gap after the 
'bits_per_pixel' to align the next field. Using __packed removes those 
gaps at the expense of runtime overhead.
>
> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_frame is 12
> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_frame_unpacked is 12
>
> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_fb_request_footer is 80
> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_fb_request_footer_unpacked is 80
>
> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_fb_request is 48
> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_fb_request_unpacked is 48
>
> Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_fb_request_response is 40
> Feb 22 13:02:04 MacBook kernel: size of struct appletbdrm_fb_request_response_unpacked is 40
>
> So, the difference in sizeof in unpacked and packed is only in appletbdrm_msg_information. So, I kept this packed, and removed it from others. The Touch Bar still works.
>
> So maybe keep just this packed?

The fields in the TCP header are aligned by design. Unfortunately, this 
hardware's protocol is not. And there's no way of fixing this now. Just 
keep all of them packed if you want. At least it's clear then what 
happens. And if your hardware requires this, you can't do much anyway.

Best regards
Thomas


>>
>>
>> ...
>>
>>>>> + if (response->msg == APPLETBDRM_MSG_SIGNAL_READINESS) {
>>>>> + if (!readiness_signal_received) {
>>>>> + readiness_signal_received = true;
>>>>> + goto retry;
>>>>> + }
>>>>> +
>>>>> + drm_err(drm, "Encountered unexpected readiness signal\n");
>>>>> + return -EIO;
>>>>> + }
>>>>> +
>>>>> + if (actual_size != size) {
>>>>> + drm_err(drm, "Actual size (%d) doesn't match expected size (%lu)\n",
>>>>> + actual_size, size);
>>>>> + return -EIO;
>>>>> + }
>>>>> +
>>>>> + if (response->msg != expected_response) {
>>>>> + drm_err(drm, "Unexpected response from device (expected %p4ch found %p4ch)\n",
>>>>> + &expected_response, &response->msg);
>>>>> + return -EIO;
>>>> For three different cases the same error code, can it be adjusted more to the
>>>> situation?
>>> All these are I/O errors, you got any suggestion?
>> Your email client mangled the code so badly that it's hard to read. But I would
>> suggest to use -EINTR in the first case, and -EBADMSG. But also you may consider
>> -EPROTO.
> Thanks
>>>>> + }
>> ...
>>
>>>>> + if (ret)
>>>>> + return ret;
>>>>> + else if (!new_plane_state->visible)
>>>> Why 'else'? It's redundant.
>>> I’ve just followed what other drm drivers are doing here:
>>>
>>> https://elixir.bootlin.com/linux/v6.13.3/source/drivers/gpu/drm/tiny/bochs.c#L436
>>> https://elixir.bootlin.com/linux/v6.13.3/source/drivers/gpu/drm/tiny/cirrus.c#L363
>>>
>>> And plenty more
>> A bad example is still a bad example. 'else' is simply redundant in this
>> case and add a noisy to the code.
>>
>>> I won’t mind removing else. You want that?
>> Sure.
>>
>> ...
>>
>>>>> + request_size = ALIGN(sizeof(struct appletbdrm_fb_request) +
>>>>> +        frames_size +
>>>>> +        sizeof(struct appletbdrm_fb_request_footer), 16);
>>>> Missing header for ALIGN().
>>>>
>>>> But have you checked overflow.h for the possibility of using some helper macros
>>>> from there? This is what should be usually done for k*alloc() in the kernel.
>>> I don’t really think we need a macro here.
>> Hmm... is frames_size known to be in a guaranteed range to make sure no
>> potential overflow happens?
> I don’t really find any cause of potential overflow.
>
>
>>>>> + appletbdrm_state->request = kzalloc(request_size, GFP_KERNEL);
>>>>> +
>>>>> + if (!appletbdrm_state->request)
>>>>> + return -ENOMEM;
>> ...
>>
>>>>> + request->msg_id = timestamp & 0xff;
>>>> Why ' & 0xff'?
>>> https://github.com/imbushuo/DFRDisplayKm/blob/master/src/DFRDisplayKm/DfrDisplay.c#L147
>> This is not an answer.
>> Why do you need this here? Isn't the type of msg_id enough?
> Hmm, I double checked this. msg_id is u8 in the Linux port so would anyways never exceed 0xff. I’ll remove this.
> Its different in the Windows driver.
>> ...
>>
>>>>> + adev->mode = (struct drm_display_mode) {
>>>> Why do you need a compound literal here? Perhaps you want to have that to be
>>>> done directly in DRM_MODE_INIT()?
>>> I really don’t find this as an issue. You want me to declare another structure, basically this?:
>> Nope, I'm asking if the DRM_MODE_INIT() is done in a way that it only can be
>> used for the static data. Seems like the case. Have you tried to convert
>> DRM_MODE_INIT() to be always a compound literal? Does it break things?
> Seems to be breaking things.
>>> struct drm_display_mode mode = {
>>> DRM_MODE_INIT(60, adev->height, adev->width,
>>> DRM_MODE_RES_MM(adev->height, 218),
>>> DRM_MODE_RES_MM(adev->width, 218))
>>> };
>>> adev->mode = mode;
>>>
>>>>> + DRM_MODE_INIT(60, adev->height, adev->width,
>>>>> +       DRM_MODE_RES_MM(adev->height, 218),
>>>>> +       DRM_MODE_RES_MM(adev->width, 218))
>>>>> + };
>> -- 
>> With Best Regards,
>> Andy Shevchenko
>>
>>

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)

Re: [PATCH v3 3/3] drm/tiny: add driver for Apple Touch Bars in x86 Macs

[andriy.shevchenko]

On Mon, Feb 24, 2025 at 09:41:43AM +0100, Thomas Zimmermann wrote:
> Am 22.02.25 um 10:07 schrieb Aditya Garg:

...

> > > What padding, please? Why TCP UAPI headers do not have these attributes?
> > > Think about it, and think about what actually __packed does and how it affects
> > > (badly) the code generation. Otherwise it looks like a cargo cult.
> > > 
> > > > I tried removing __packed btw and driver no longer works.
> > > So, you need to find a justification why. But definitely not due to padding in
> > > many of them. They can go without __packed as they are naturally aligned.
> > Alright, I did some debugging, basically printk sizeof(struct). Did it for both packed and unpacked with the following results:
> > 
> > Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_request_header is 16
> > Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_request_header_unpacked is 16
> > 
> > Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_response_header is 20
> > Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_response_header_unpacked is 20
> > 
> > Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_simple_request is 32
> > Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_simple_request_unpacked is 32
> > 
> > Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_information is 65
> > Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_msg_information_unpacked is 68
> 
> In the unpacked version, there is a 3-byte gap after the 'bits_per_pixel' to
> align the next field. Using __packed removes those gaps at the expense of
> runtime overhead.
> > 
> > Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_frame is 12
> > Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_frame_unpacked is 12
> > 
> > Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_fb_request_footer is 80
> > Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_fb_request_footer_unpacked is 80
> > 
> > Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_fb_request is 48
> > Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_fb_request_unpacked is 48
> > 
> > Feb 22 13:02:03 MacBook kernel: size of struct appletbdrm_fb_request_response is 40
> > Feb 22 13:02:04 MacBook kernel: size of struct appletbdrm_fb_request_response_unpacked is 40
> > 
> > So, the difference in sizeof in unpacked and packed is only in appletbdrm_msg_information. So, I kept this packed, and removed it from others. The Touch Bar still works.
> > 
> > So maybe keep just this packed?
> 
> The fields in the TCP header are aligned by design.

> Unfortunately, this hardware's protocol is not. And there's no way of fixing
> this now. Just keep all of them packed if you want.

It would be nice to see the difference in the code generation for the all
__packed vs. only those that require it.

> At least it's clear then
> what happens. And if your hardware requires this, you can't do much anyway.

One aspect (member level alignment) is clear but the other is not
(object level alignment). I dunno if it makes sense to be pedantic about this,
but would like to see the binary outcome asked for.

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v3 3/3] drm/tiny: add driver for Apple Touch Bars in x86 Macs

[Aditya Garg]

> 
> It would be nice to see the difference in the code generation for the all
> __packed vs. only those that require it.
> 
>> At least it's clear then
>> what happens. And if your hardware requires this, you can't do much anyway.
> 
> One aspect (member level alignment) is clear but the other is not
> (object level alignment). I dunno if it makes sense to be pedantic about this,
> but would like to see the binary outcome asked for.

Hex dump of the compiled binary:

1. All packed:

00000000: 7f45 4c46 0201 0100 0000 0000 0000 0000  .ELF............
00000010: 0100 3e00 0100 0000 0000 0000 0000 0000  ..>.............
00000020: 0000 0000 0000 0000 e084 0000 0000 0000  ................
00000030: 0000 0000 4000 0000 0000 4000 2a00 2900  ....@.....@.*.).
00000040: 0400 0000 1400 0000 0300 0000 474e 5500  ............GNU.
00000050: aa4c 98f4 a8d5 30bc e50a 9478 fcb1 bcf0  .L....0....x....
00000060: bc77 dd31 0600 0000 0400 0000 0101 0000  .w.1............
00000070: 4c69 6e75 7800 0000 0000 0000 0600 0000  Linux...........
00000080: 0100 0000 0001 0000 4c69 6e75 7800 0000  ........Linux...
00000090: 0000 0000 0000 0000 0000 0000 0000 0000  ................
000000a0: 9090 9090 9090 9090 9090 9090 9090 9090  ................
000000b0: e800 0000 0055 488b bfc8 0000 0048 83c7  .....UH......H..
000000c0: 2048 89e5 e800 0000 005d 31ff e900 0000   H.......]1.....
000000d0: 0066 662e 0f1f 8400 0000 0000 0f1f 4000  .ff...........@.
000000e0: 9090 9090 9090 9090 9090 9090 9090 9090  ................
000000f0: e800 0000 0055 4889 e553 488b 9fc8 0000  .....UH..SH.....
00000100: 0048 83c3 2048 89df e800 0000 0048 89df  .H.. H.......H..
00000110: e800 0000 0048 8b5d f8c9 31ff e900 0000  .....H.]..1.....
00000120: 0066 662e 0f1f 8400 0000 0000 0f1f 4000  .ff...........@.
00000130: 9090 9090 9090 9090 9090 9090 9090 9090  ................
00000140: e800 0000 0048 8b57 e848 85d2 7415 5548  .....H.W.H..t.UH
00000150: 89e5 e800 0000 005d 31d2 31f6 31ff e900  .......]1.1.1...
00000160: 0000 0048 c7c0 edff ffff 31d2 31f6 31ff  ...H......1.1.1.
00000170: e900 0000 0066 662e 0f1f 8400 0000 0000  .....ff.........
00000180: 9090 9090 9090 9090 9090 9090 9090 9090  ................
00000190: e800 0000 0055 4889 f041 b9e8 0300 0048  .....UH..A.....H
000001a0: 89e5 4156 4989 d641 554c 8d45 d444 89f1  ..AVI..AUL.E.D..
000001b0: 4154 5348 89fb 4c8d 6320 4883 ec10 6548  ATSH..L.c H...eH
000001c0: 8b14 2528 0000 0048 8955 d848 8b17 c745  ..%(...H.U.H...E
000001d0: d400 0000 0048 8b7a 408b 5314 8bb7 58ff  .....H.z@.S...X.
000001e0: ffff c1e2 0f48 81ef a800 0000 c1e6 0809  .....H..........
000001f0: d648 89c2 81ce 0000 00c0 e800 0000 0041  .H.............A
00000200: 89c5 85c0 753d 4863 45d4 4889 c24c 39f0  ....u=HcE.H..L9.
00000210: 754e 488b 45d8 6548 2b04 2528 0000 0075  uNH.E.eH+.%(...u
00000220: 6248 83c4 1044 89e8 5b41 5c41 5d41 5e5d  bH...D..[A\A]A^]
00000230: 31d2 31c9 31f6 31ff 4531 c045 31c9 e900  1.1.1.1.E1.E1...
00000240: 0000 004d 85e4 7404 4c8b 6328 4489 ea48  ...M..t.L.c(D..H
00000250: c7c6 0000 0000 4c89 e7e8 0000 0000 ebb2  ......L.........
00000260: 4d85 e474 044c 8b63 284c 89f1 48c7 c600  M..t.L.c(L..H...
00000270: 0000 004c 89e7 41bd fbff ffff e800 0000  ...L..A.........
00000280: 00eb 8fe8 0000 0000 0f1f 8400 0000 0000  ................
00000290: 9090 9090 9090 9090 9090 9090 9090 9090  ................
000002a0: e800 0000 0055 4889 e541 5741 5649 89f6  .....UH..AWAVI..
000002b0: 4155 4c8d 6f20 4154 41bc 0200 0000 5348  AUL.o ATA.....SH
000002c0: 89fb 4883 ec28 4889 55b0 894d c465 488b  ..H..(H.U..M.eH.
000002d0: 0425 2800 0000 4889 45d0 488b 07c7 45cc  .%(...H.E.H...E.
000002e0: 0000 0000 8955 c04c 8b78 4049 8d87 58ff  .....U.L.x@I..X.
000002f0: ffff 4889 45b8 8b43 108b 4dc0 41b9 e803  ..H.E..C..M.A...
00000300: 0000 4c8d 45cc 418b b758 ffff ff48 8b7d  ..L.E.A..X...H.}
00000310: b84c 89f2 c1e0 0fc1 e608 09c6 81ce 8000  .L..............
00000320: 00c0 e800 0000 0085 c075 7241 8b56 1081  .........urA.V..
00000330: fa59 4445 520f 8584 0000 0041 83fc 0175  .YDER......A...u
00000340: 514d 85ed 7404 4c8b 6b28 48c7 c600 0000  QM..t.L.k(H.....
00000350: 004c 89ef e800 0000 00b8 fbff ffff 488b  .L............H.
00000360: 55d0 6548 2b14 2528 0000 000f 85ab 0000  U.eH+.%(........
00000370: 0048 83c4 285b 415c 415d 415e 415f 5d31  .H..([A\A]A^A_]1
00000380: d231 c931 f631 ff45 31c0 4531 c9e9 0000  .1.1.1.E1.E1....
00000390: 0000 41bc 0100 0000 e959 ffff ff4d 85ed  ..A......Y...M..
000003a0: 7404 4c8b 6b28 89c2 48c7 c600 0000 004c  t.L.k(..H......L
000003b0: 89ef 8945 b8e8 0000 0000 8b45 b8eb 9f48  ...E.......E...H
000003c0: 634d cc48 8b7d b048 89ce 4839 f975 2a3b  cM.H.}.H..H9.u*;
000003d0: 55c4 748a 498d 4e10 4d85 ed74 044c 8b6b  U.t.I.N.M..t.L.k
000003e0: 2848 8d55 c448 c7c6 0000 0000 4c89 efe8  (H.U.H......L...
000003f0: 0000 0000 e960 ffff ff4d 85ed 7404 4c8b  .....`...M..t.L.
00000400: 6b28 488b 4db0 89f2 4c89 ef48 c7c6 0000  k(H.M...L..H....
00000410: 0000 e800 0000 00e9 3dff ffff e800 0000  ........=.......
00000420: 0066 662e 0f1f 8400 0000 0000 0f1f 4000  .ff...........@.
00000430: 9090 9090 9090 9090 9090 9090 9090 9090  ................
00000440: e800 0000 0055 488b 0748 8db0 1806 0000  .....UH..H......
00000450: 4889 e5e8 0000 0000 5d31 f631 ffe9 0000  H.......]1.1....
00000460: 0000 6666 2e0f 1f84 0000 0000 000f 1f00  ..ff............
00000470: 9090 9090 9090 9090 9090 9090 9090 9090  ................
00000480: e800 0000 0055 488b 0748 8d90 1806 0000  .....UH..H......
00000490: 4889 e5e8 0000 0000 5d31 d231 f631 ffe9  H.......]1.1.1..
000004a0: 0000 0000 6666 2e0f 1f84 0000 0000 0090  ....ff..........
000004b0: 9090 9090 9090 9090 9090 9090 9090 9090  ................
000004c0: e800 0000 0055 488b be48 0100 0048 89e5  .....UH..H...H..
000004d0: 5348 89f3 e800 0000 0048 8bbb 5001 0000  SH.......H..P...
000004e0: e800 0000 0048 89df e800 0000 0048 89df  .....H.......H..
000004f0: e800 0000 0048 8b5d f8c9 31f6 31ff e900  .....H.]..1.1...
00000500: 0000 0066 662e 0f1f 8400 0000 0000 6690  ...ff.........f.
00000510: 9090 9090 9090 9090 9090 9090 9090 9090  ................
00000520: e800 0000 0055 4889 e541 5453 488b 9fd8  .....UH..ATSH...
00000530: 0400 0048 85db 7450 4989 fcba c00c 0000  ...H..tPI.......
00000540: 4889 dfbe 6801 0000 e800 0000 0048 89c3  H...h........H..
00000550: 4885 c074 2148 c780 4801 0000 0000 0000  H..t!H..H.......
00000560: 4889 c64c 89e7 48c7 8050 0100 0000 0000  H..L..H..P......
00000570: 00e8 0000 0000 4889 d85b 415c 5d31 d231  ......H..[A\]1.1
00000580: f631 ffe9 0000 0000 0f0b 4889 d85b 415c  .1........H..[A\
00000590: 5d31 d231 f631 ffe9 0000 0000 0f1f 4000  ]1.1.1........@.
000005a0: 9090 9090 9090 9090 9090 9090 9090 9090  ................
000005b0: e800 0000 0055 4889 e541 5741 5641 5541  .....UH..AWAVAUA
000005c0: 5453 4883 e4f0 4881 ecb0 0000 004c 8b2f  TSH...H......L./
000005d0: 488b 9fd8 0400 0065 488b 0425 2800 0000  H......eH..%(...
000005e0: 4889 8424 a800 0000 31c0 8b87 cc04 0000  H..$....1.......
000005f0: c744 244c 0000 0000 4c89 ef48 c1e0 0548  .D$L....L..H...H
00000600: 0346 1848 8d74 244c 4c8b 7810 e800 0000  .F.H.t$LL.x.....
00000610: 0084 c075 3a48 8b84 24a8 0000 0065 482b  ...u:H..$....eH+
00000620: 0425 2800 0000 0f85 0803 0000 488d 65d8  .%(.........H.e.
00000630: 5b41 5c41 5d41 5e41 5f5d 31c0 31d2 31c9  [A\A]A^A_]1.1.1.
00000640: 31f6 31ff 4531 c045 31c9 e900 0000 0048  1.1.E1.E1......H
00000650: 8b83 5001 0000 48c7 8424 8000 0000 0000  ..P...H..$......
00000660: 0000 48c7 8424 8800 0000 0000 0000 4889  ..H..$........H.
00000670: 4424 1848 8b83 4801 0000 48c7 8424 9000  D$.H..H...H..$..
00000680: 0000 0000 0000 48c7 8424 9800 0000 0000  ......H..$......
00000690: 0000 48c7 8424 a000 0000 0000 0000 4c8b  ..H..$........L.
000006a0: 7310 4889 4424 28e8 0000 0000 4889 4424  s.H.D$(.....H.D$
000006b0: 3048 8b83 6001 0000 48c7 4424 6000 0000  0H..`...H.D$`...
000006c0: 0048 c744 2468 0000 0000 4889 4424 2048  .H.D$h....H.D$ H
000006d0: 85c0 7450 488b 8358 0100 00be 0200 0000  ..tPH..X........
000006e0: 4c89 f74c 896c 2410 4889 4424 08e8 0000  L..L.l$.H.D$....
000006f0: 0000 85c0 743c 4d85 ed74 0949 8b5d 0848  ....t<M..t.I.].H
00000700: 895c 2410 488b 7c24 1089 c248 c7c6 0000  .\$.H.|$...H....
00000710: 0000 e800 0000 00be 0200 0000 4c89 f7e8  ............L...
00000720: 0000 0000 8b7c 244c e800 0000 00e9 e3fe  .....|$L........
00000730: ffff 488b 4c24 284c 89fe 4889 da48 b802  ..H.L$(L..H..H..
00000740: 0012 0009 0000 0048 8dbc 2480 0000 0048  .......H..$....H
00000750: 8901 8b44 2408 4c8d 6130 4d89 e783 e810  ...D$.L.a0M.....
00000760: 8941 0cb8 0100 0000 6689 4110 0fb6 4424  .A......f.A...D$
00000770: 3088 4112 e800 0000 0048 8d74 2460 488d  0.A......H.t$`H.
00000780: bc24 8000 0000 e800 0000 0084 c00f 84f1  .$..............
00000790: 0000 0048 8b43 7c8b 4c24 6448 8d74 2460  ...H.C|.L$dH.t$`
000007a0: 488d 7c24 7048 8b93 8400 0000 448b 6424  H.|$pH......D.d$
000007b0: 6048 c744 2458 0000 0000 4889 4424 7049  `H.D$X....H.D$pI
000007c0: 8d47 0c48 8954 2478 8b54 246c 4889 4424  .G.H.T$x.T$lH.D$
000007d0: 508b 4424 6889 5424 4089 4424 4489 4c24  P.D$h.T$@.D$D.L$
000007e0: 3ce8 0000 0000 84c0 748f 8b44 2444 8b54  <.......t..D$D.T
000007f0: 2440 8b4c 243c 4429 e029 ca0f afc2 488d  $@.L$<D).)....H.
00000800: 9308 0100 0044 8d24 408b 4424 6466 4189  .....D.$@.D$dfA.
00000810: 0741 8b45 fc66 2b44 2468 6641 8947 028b  .A.E.f+D$hfA.G..
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00000e50: 0000 39c2 4c89 55b0 41c7 87a0 0500 0018  ..9.L.U.A.......
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00000ea0: 8997 3e06 0000 48b9 f11f 3c80 0fff c103  ..>...H...<.....
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00001300: 8985 5001 0000 4885 c074 184d 89b5 5801  ..P...H..t.M..X.
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00001340: e800 0000 0055 48c7 c200 0000 0048 c7c6  .....UH......H..
00001350: 0000 0000 48c7 c700 0000 0048 89e5 e800  ....H......H....
00001360: 0000 005d 31d2 31f6 31ff e900 0000 0000  ...]1.1.1.......
00001370: 9090 9090 9090 9090 9090 9090 9090 9090  ................
00001380: 5548 c7c7 0000 0000 4889 e5e8 0000 0000  UH......H.......
00001390: 5d31 ffe9 0000 0000 89ca be01 0000 0048  ]1.............H
000013a0: c7c7 0000 0000 894d b0e8 0000 0000 8b4d  .......M.......M
000013b0: b0e9 0000 0000 410f b6f6 48c7 c700 0000  ......A...H.....
000013c0: 00e8 0000 0000 e900 0000 0061 7070 6c65  ...........apple
000013d0: 7462 6472 6d00 6170 706c 6574 6264 726d  tbdrm.appletbdrm
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00001460: 6172 2044 524d 2044 7269 7665 7200 0000  ar DRM Driver...
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00001480: 0000 0000 0000 0000 0000 0000 0000 0000  ................
00001490: 0000 0000 0000 0000 0000 0000 0000 0000  ................
000014a0: 0000 0000 0000 0000 0000 0000 0000 0000  ................
000014b0: 0000 0000 0000 0000 0000 0000 0000 0000  ................
000014c0: 0000 0000 0000 0000 0000 0000 0000 0000  ................
000014d0: 0000 0000 0000 0000 0000 0000 0000 0000  ................
000014e0: 0000 0000 0000 0000 0000 0000 0000 0000  ................
000014f0: 5b64 726d 5d20 2a45 5252 4f52 2a20 4661  [drm] *ERROR* Fa
00001500: 696c 6564 2074 6f20 7365 6e64 206d 6573  iled to send mes
00001510: 7361 6765 2028 2564 290a 0000 0000 0000  sage (%d).......
00001520: 5b64 726d 5d20 2a45 5252 4f52 2a20 4163  [drm] *ERROR* Ac
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00001560: 0a00 0000 0000 0000 5b64 726d 5d20 2a45  ........[drm] *E
00001570: 5252 4f52 2a20 4661 696c 6564 2074 6f20  RROR* Failed to 
00001580: 7265 6164 2072 6573 706f 6e73 6520 2825  read response (%
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000015a0: 5252 4f52 2a20 456e 636f 756e 7465 7265  RROR* Encountere
000015b0: 6420 756e 6578 7065 6374 6564 2072 6561  d unexpected rea
000015c0: 6469 6e65 7373 2073 6967 6e61 6c0a 0000  diness signal...
000015d0: 5b64 726d 5d20 2a45 5252 4f52 2a20 556e  [drm] *ERROR* Un
000015e0: 6578 7065 6374 6564 2072 6573 706f 6e73  expected respons
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00001600: 7870 6563 7465 6420 2570 3463 6820 666f  xpected %p4ch fo
00001610: 756e 6420 2570 3463 6829 0a00 0000 0000  und %p4ch)......
00001620: 5b64 726d 5d20 2a45 5252 4f52 2a20 4661  [drm] *ERROR* Fa
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00001640: 5520 6672 616d 6562 7566 6665 7220 6163  U framebuffer ac
00001650: 6365 7373 2028 2564 290a 0000 0000 0000  cess (%d).......
00001660: 5b64 726d 5d20 2a45 5252 4f52 2a20 5265  [drm] *ERROR* Re
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000016b0: 4661 696c 6564 2074 6f20 6669 6e64 2062  Failed to find b
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000016d0: 5b64 726d 5d20 2a45 5252 4f52 2a20 456e  [drm] *ERROR* En
000016e0: 636f 756e 7465 7265 6420 756e 6578 7065  countered unexpe
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00001700: 7865 6c20 7661 6c75 6520 2825 6429 0a00  xel value (%d)..
00001710: 5b64 726d 5d20 2a45 5252 4f52 2a20 456e  [drm] *ERROR* En
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00001760: 666f 726d 6174 696f 6e0a 0000 0000 0000  formation.......
00001770: 4661 696c 6564 2074 6f20 696e 6974 6961  Failed to initia
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00001790: 7572 6174 696f 6e0a 0000 0000 0000 0000  uration.........
000017a0: 4661 696c 6564 2074 6f20 696e 6974 6961  Failed to initia
000017b0: 6c69 7a65 2075 6e69 7665 7273 616c 2070  lize universal p
000017c0: 6c61 6e65 206f 626a 6563 740a 0000 0000  lane object.....
000017d0: 4661 696c 6564 2074 6f20 696e 6974 6961  Failed to initia
000017e0: 6c69 7a65 2043 5254 4320 6f62 6a65 6374  lize CRTC object
000017f0: 0a00 0000 0000 0000 4661 696c 6564 2074  ........Failed t
00001800: 6f20 696e 6974 6961 6c69 7a65 2063 6f6e  o initialize con
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00001820: 6f20 7365 7420 7061 6e65 6c20 6f72 6965  o set panel orie
00001830: 6e74 6174 696f 6e0a 0000 0000 0000 0000  ntation.........
00001840: 4661 696c 6564 2074 6f20 7365 7420 6e6f  Failed to set no
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00005bb0: 6772 3838 3800 6465 765f 6572 725f 7072  gr888.dev_err_pr
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00005bd0: 6669 675f 7265 7365 7400 5f5f 6472 6d5f  fig_reset.__drm_
00005be0: 6765 6d5f 6475 706c 6963 6174 655f 7368  gem_duplicate_sh
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00005c00: 005f 5f75 6273 616e 5f68 616e 646c 655f  .__ubsan_handle_
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00005c50: 6963 5f68 656c 7065 725f 6372 7463 5f64  ic_helper_crtc_d
00005c60: 7570 6c69 6361 7465 5f73 7461 7465 0064  uplicate_state.d
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00005ca0: 726d 5f64 6576 5f72 6567 6973 7465 7200  rm_dev_register.
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000084c0: 6e75 2e6c 696e 6b6f 6e63 652e 7468 6973  nu.linkonce.this
000084d0: 5f6d 6f64 756c 6500 2e62 7373 0000 0000  _module..bss....
000084e0: 0000 0000 0000 0000 0000 0000 0000 0000  ................
000084f0: 0000 0000 0000 0000 0000 0000 0000 0000  ................
00008500: 0000 0000 0000 0000 0000 0000 0000 0000  ................
00008510: 0000 0000 0000 0000 0000 0000 0000 0000  ................
00008520: 1b00 0000 0700 0000 0200 0000 0000 0000  ................
00008530: 0000 0000 0000 0000 4000 0000 0000 0000  ........@.......
00008540: 2400 0000 0000 0000 0000 0000 0000 0000  $...............
00008550: 0400 0000 0000 0000 0000 0000 0000 0000  ................
00008560: 2e00 0000 0700 0000 0200 0000 0000 0000  ................
00008570: 0000 0000 0000 0000 6400 0000 0000 0000  ........d.......
00008580: 3000 0000 0000 0000 0000 0000 0000 0000  0...............
00008590: 0400 0000 0000 0000 0000 0000 0000 0000  ................
000085a0: 3f00 0000 0100 0000 0600 0000 0000 0000  ?...............
000085b0: 0000 0000 0000 0000 a000 0000 0000 0000  ................
000085c0: 8e12 0000 0000 0000 0000 0000 0000 0000  ................
000085d0: 1000 0000 0000 0000 0000 0000 0000 0000  ................
000085e0: 3a00 0000 0400 0000 4000 0000 0000 0000  :.......@.......
000085f0: 0000 0000 0000 0000 d05c 0000 0000 0000  .........\......
00008600: e80e 0000 0000 0000 2700 0000 0300 0000  ........'.......
00008610: 0800 0000 0000 0000 1800 0000 0000 0000  ................
00008620: 4a00 0000 0100 0000 0600 0000 0000 0000  J...............
00008630: 0000 0000 0000 0000 3013 0000 0000 0000  ........0.......
00008640: 3f00 0000 0000 0000 0000 0000 0000 0000  ?...............
00008650: 1000 0000 0000 0000 0000 0000 0000 0000  ................
00008660: 4500 0000 0400 0000 4000 0000 0000 0000  E.......@.......
00008670: 0000 0000 0000 0000 b86b 0000 0000 0000  .........k......
00008680: 9000 0000 0000 0000 2700 0000 0500 0000  ........'.......
00008690: 0800 0000 0000 0000 1800 0000 0000 0000  ................
000086a0: 5a00 0000 0100 0000 0600 0000 0000 0000  Z...............
000086b0: 0000 0000 0000 0000 7013 0000 0000 0000  ........p.......
000086c0: 2800 0000 0000 0000 0000 0000 0000 0000  (...............
000086d0: 1000 0000 0000 0000 0000 0000 0000 0000  ................
000086e0: 5500 0000 0400 0000 4000 0000 0000 0000  U.......@.......
000086f0: 0000 0000 0000 0000 486c 0000 0000 0000  ........Hl......
00008700: 4800 0000 0000 0000 2700 0000 0700 0000  H.......'.......
00008710: 0800 0000 0000 0000 1800 0000 0000 0000  ................
00008720: 6a00 0000 0100 0000 0600 0000 0000 0000  j...............
00008730: 0000 0000 0000 0000 9813 0000 0000 0000  ................
00008740: 3300 0000 0000 0000 0000 0000 0000 0000  3...............
00008750: 0100 0000 0000 0000 0000 0000 0000 0000  ................
00008760: 6500 0000 0400 0000 4000 0000 0000 0000  e.......@.......
00008770: 0000 0000 0000 0000 906c 0000 0000 0000  .........l......
00008780: 9000 0000 0000 0000 2700 0000 0900 0000  ........'.......
00008790: 0800 0000 0000 0000 1800 0000 0000 0000  ................
000087a0: 7900 0000 0100 0000 3200 0000 0000 0000  y.......2.......
000087b0: 0000 0000 0000 0000 cb13 0000 0000 0000  ................
000087c0: a300 0000 0000 0000 0000 0000 0000 0000  ................
000087d0: 0100 0000 0000 0000 0100 0000 0000 0000  ................
000087e0: 8d00 0000 0100 0000 0200 0000 0000 0000  ................
000087f0: 0000 0000 0000 0000 6e14 0000 0000 0000  ........n.......
00008800: 8000 0000 0000 0000 0000 0000 0000 0000  ................
00008810: 0100 0000 0000 0000 0000 0000 0000 0000  ................
00008820: 8800 0000 0400 0000 4000 0000 0000 0000  ........@.......
00008830: 0000 0000 0000 0000 206d 0000 0000 0000  ........ m......
00008840: 8001 0000 0000 0000 2700 0000 0c00 0000  ........'.......
00008850: 0800 0000 0000 0000 1800 0000 0000 0000  ................
00008860: 9a00 0000 0100 0000 3200 0000 0000 0000  ........2.......
00008870: 0000 0000 0000 0000 f014 0000 0000 0000  ................
00008880: 4804 0000 0000 0000 0000 0000 0000 0000  H...............
00008890: 0800 0000 0000 0000 0100 0000 0000 0000  ................
000088a0: a900 0000 0100 0000 0200 0000 0000 0000  ................
000088b0: 0000 0000 0000 0000 3819 0000 0000 0000  ........8.......
000088c0: 1101 0000 0000 0000 0000 0000 0000 0000  ................
000088d0: 0100 0000 0000 0000 0000 0000 0000 0000  ................
000088e0: b700 0000 0100 0000 0200 0000 0000 0000  ................
000088f0: 0000 0000 0000 0000 601a 0000 0000 0000  ........`.......
00008900: c805 0000 0000 0000 0000 0000 0000 0000  ................
00008910: 2000 0000 0000 0000 0000 0000 0000 0000   ...............
00008920: b200 0000 0400 0000 4000 0000 0000 0000  ........@.......
00008930: 0000 0000 0000 0000 a06e 0000 0000 0000  .........n......
00008940: 0804 0000 0000 0000 2700 0000 1000 0000  ........'.......
00008950: 0800 0000 0000 0000 1800 0000 0000 0000  ................
00008960: c400 0000 0100 0000 0200 0000 0000 0000  ................
00008970: 0000 0000 0000 0000 2820 0000 0000 0000  ........( ......
00008980: 4c00 0000 0000 0000 0000 0000 0000 0000  L...............
00008990: 0100 0000 0000 0000 0000 0000 0000 0000  ................
000089a0: bf00 0000 0400 0000 4000 0000 0000 0000  ........@.......
000089b0: 0000 0000 0000 0000 a872 0000 0000 0000  .........r......
000089c0: c801 0000 0000 0000 2700 0000 1200 0000  ........'.......
000089d0: 0800 0000 0000 0000 1800 0000 0000 0000  ................
000089e0: d700 0000 0100 0000 0200 0000 0000 0000  ................
000089f0: 0000 0000 0000 0000 7420 0000 0000 0000  ........t ......
00008a00: bc01 0000 0000 0000 0000 0000 0000 0000  ................
00008a10: 0100 0000 0000 0000 0000 0000 0000 0000  ................
00008a20: d200 0000 0400 0000 4000 0000 0000 0000  ........@.......
00008a30: 0000 0000 0000 0000 7074 0000 0000 0000  ........pt......
00008a40: 680a 0000 0000 0000 2700 0000 1400 0000  h.......'.......
00008a50: 0800 0000 0000 0000 1800 0000 0000 0000  ................
00008a60: e300 0000 0100 0000 0200 0000 0000 0000  ................
00008a70: 0000 0000 0000 0000 4022 0000 0000 0000  ........@"......
00008a80: c013 0000 0000 0000 0000 0000 0000 0000  ................
00008a90: 2000 0000 0000 0000 0000 0000 0000 0000   ...............
00008aa0: f300 0000 0100 0000 0300 0000 0000 0000  ................
00008ab0: 0000 0000 0000 0000 0036 0000 0000 0000  .........6......
00008ac0: 1800 0000 0000 0000 0000 0000 0000 0000  ................
00008ad0: 0800 0000 0000 0000 0000 0000 0000 0000  ................
00008ae0: ee00 0000 0400 0000 4000 0000 0000 0000  ........@.......
00008af0: 0000 0000 0000 0000 d87e 0000 0000 0000  .........~......
00008b00: 6000 0000 0000 0000 2700 0000 1700 0000  `.......'.......
00008b10: 0800 0000 0000 0000 1800 0000 0000 0000  ................
00008b20: 0401 0000 0100 0000 8300 0000 0000 0000  ................
00008b30: 1800 0000 0000 0000 1836 0000 0000 0000  .........6......
00008b40: 8800 0000 0000 0000 0500 0000 0000 0000  ................
00008b50: 0800 0000 0000 0000 0000 0000 0000 0000  ................
00008b60: ff00 0000 0400 0000 4000 0000 0000 0000  ........@.......
00008b70: 0000 0000 0000 0000 387f 0000 0000 0000  ........8.......
00008b80: 9801 0000 0000 0000 2700 0000 1900 0000  ........'.......
00008b90: 0800 0000 0000 0000 1800 0000 0000 0000  ................
00008ba0: 2101 0000 0100 0000 0100 0000 0000 0000  !...............
00008bb0: 0000 0000 0000 0000 a036 0000 0000 0000  .........6......
00008bc0: 0000 0000 0000 0000 0000 0000 0000 0000  ................
00008bd0: 0100 0000 0000 0000 0000 0000 0000 0000  ................
00008be0: 3501 0000 0100 0000 3000 0000 0000 0000  5.......0.......
00008bf0: 0000 0000 0000 0000 a036 0000 0000 0000  .........6......
00008c00: 8400 0000 0000 0000 0000 0000 0000 0000  ................
00008c10: 0100 0000 0000 0000 0100 0000 0000 0000  ................
00008c20: 3e01 0000 0100 0000 0000 0000 0000 0000  >...............
00008c30: 0000 0000 0000 0000 2437 0000 0000 0000  ........$7......
00008c40: 0000 0000 0000 0000 0000 0000 0000 0000  ................
00008c50: 0100 0000 0000 0000 0000 0000 0000 0000  ................
00008c60: 5301 0000 0100 0000 0300 0000 0000 0000  S...............
00008c70: a000 0000 0000 0000 4037 0000 0000 0000  ........@7......
00008c80: 3e02 0000 0000 0000 0000 0000 0000 0000  >...............
00008c90: 2000 0000 0000 0000 0000 0000 0000 0000   ...............
00008ca0: 4e01 0000 0400 0000 4000 0000 0000 0000  N.......@.......
00008cb0: 0000 0000 0000 0000 d080 0000 0000 0000  ................
00008cc0: 1002 0000 0000 0000 2700 0000 1e00 0000  ........'.......
00008cd0: 0800 0000 0000 0000 1800 0000 0000 0000  ................
00008ce0: 5e01 0000 0100 0000 0300 0000 0000 0000  ^...............
00008cf0: 0000 0000 0000 0000 8039 0000 0000 0000  .........9......
00008d00: 0800 0000 0000 0000 0000 0000 0000 0000  ................
00008d10: 0800 0000 0000 0000 0000 0000 0000 0000  ................
00008d20: 5901 0000 0400 0000 4000 0000 0000 0000  Y.......@.......
00008d30: 0000 0000 0000 0000 e082 0000 0000 0000  ................
00008d40: 1800 0000 0000 0000 2700 0000 2000 0000  ........'... ...
00008d50: 0800 0000 0000 0000 1800 0000 0000 0000  ................
00008d60: 6e01 0000 0100 0000 0300 0000 0000 0000  n...............
00008d70: 0000 0000 0000 0000 8839 0000 0000 0000  .........9......
00008d80: 0800 0000 0000 0000 0000 0000 0000 0000  ................
00008d90: 0800 0000 0000 0000 0000 0000 0000 0000  ................
00008da0: 6901 0000 0400 0000 4000 0000 0000 0000  i.......@.......
00008db0: 0000 0000 0000 0000 f882 0000 0000 0000  ................
00008dc0: 1800 0000 0000 0000 2700 0000 2200 0000  ........'..."...
00008dd0: 0800 0000 0000 0000 1800 0000 0000 0000  ................
00008de0: 7e01 0000 0100 0000 0300 0000 0000 0000  ~...............
00008df0: 0000 0000 0000 0000 c039 0000 0000 0000  .........9......
00008e00: 0005 0000 0000 0000 0000 0000 0000 0000  ................
00008e10: 4000 0000 0000 0000 0000 0000 0000 0000  @...............
00008e20: 7901 0000 0400 0000 4000 0000 0000 0000  y.......@.......
00008e30: 0000 0000 0000 0000 1083 0000 0000 0000  ................
00008e40: 3000 0000 0000 0000 2700 0000 2400 0000  0.......'...$...
00008e50: 0800 0000 0000 0000 1800 0000 0000 0000  ................
00008e60: 9801 0000 0800 0000 0300 0000 0000 0000  ................
00008e70: 0000 0000 0000 0000 c03e 0000 0000 0000  .........>......
00008e80: 0000 0000 0000 0000 0000 0000 0000 0000  ................
00008e90: 0100 0000 0000 0000 0000 0000 0000 0000  ................
00008ea0: 0100 0000 0200 0000 0000 0000 0000 0000  ................
00008eb0: 0000 0000 0000 0000 c03e 0000 0000 0000  .........>......
00008ec0: b010 0000 0000 0000 2800 0000 5c00 0000  ........(...\...
00008ed0: 0800 0000 0000 0000 1800 0000 0000 0000  ................
00008ee0: 0900 0000 0300 0000 0000 0000 0000 0000  ................
00008ef0: 0000 0000 0000 0000 704f 0000 0000 0000  ........pO......
00008f00: 5b0d 0000 0000 0000 0000 0000 0000 0000  [...............
00008f10: 0100 0000 0000 0000 0000 0000 0000 0000  ................
00008f20: 1100 0000 0300 0000 0000 0000 0000 0000  ................
00008f30: 0000 0000 0000 0000 4083 0000 0000 0000  ........@.......
00008f40: 9d01 0000 0000 0000 0000 0000 0000 0000  ................
00008f50: 0100 0000 0000 0000 0000 0000 0000 0000  ................


2. Only the trouble maker packed:

00000000: 7f45 4c46 0201 0100 0000 0000 0000 0000  .ELF............
00000010: 0100 3e00 0100 0000 0000 0000 0000 0000  ..>.............
00000020: 0000 0000 0000 0000 e084 0000 0000 0000  ................
00000030: 0000 0000 4000 0000 0000 4000 2a00 2900  ....@.....@.*.).
00000040: 0400 0000 1400 0000 0300 0000 474e 5500  ............GNU.
00000050: 271f 25d4 d21a cffc c669 b501 12b0 d98f  '.%......i......
00000060: b2a7 f71c 0600 0000 0400 0000 0101 0000  ................
00000070: 4c69 6e75 7800 0000 0000 0000 0600 0000  Linux...........
00000080: 0100 0000 0001 0000 4c69 6e75 7800 0000  ........Linux...
00000090: 0000 0000 0000 0000 0000 0000 0000 0000  ................
000000a0: 9090 9090 9090 9090 9090 9090 9090 9090  ................
000000b0: e800 0000 0055 488b bfc8 0000 0048 83c7  .....UH......H..
000000c0: 2048 89e5 e800 0000 005d 31ff e900 0000   H.......]1.....
000000d0: 0066 662e 0f1f 8400 0000 0000 0f1f 4000  .ff...........@.
000000e0: 9090 9090 9090 9090 9090 9090 9090 9090  ................
000000f0: e800 0000 0055 4889 e553 488b 9fc8 0000  .....UH..SH.....
00000100: 0048 83c3 2048 89df e800 0000 0048 89df  .H.. H.......H..
00000110: e800 0000 0048 8b5d f8c9 31ff e900 0000  .....H.]..1.....
00000120: 0066 662e 0f1f 8400 0000 0000 0f1f 4000  .ff...........@.
00000130: 9090 9090 9090 9090 9090 9090 9090 9090  ................
00000140: e800 0000 0048 8b57 e848 85d2 7415 5548  .....H.W.H..t.UH
00000150: 89e5 e800 0000 005d 31d2 31f6 31ff e900  .......]1.1.1...
00000160: 0000 0048 c7c0 edff ffff 31d2 31f6 31ff  ...H......1.1.1.
00000170: e900 0000 0066 662e 0f1f 8400 0000 0000  .....ff.........
00000180: 9090 9090 9090 9090 9090 9090 9090 9090  ................
00000190: e800 0000 0055 4889 f041 b9e8 0300 0048  .....UH..A.....H
000001a0: 89e5 4156 4989 d641 554c 8d45 d444 89f1  ..AVI..AUL.E.D..
000001b0: 4154 5348 89fb 4c8d 6320 4883 ec10 6548  ATSH..L.c H...eH
000001c0: 8b14 2528 0000 0048 8955 d848 8b17 c745  ..%(...H.U.H...E
000001d0: d400 0000 0048 8b7a 408b 5314 8bb7 58ff  .....H.z@.S...X.
000001e0: ffff c1e2 0f48 81ef a800 0000 c1e6 0809  .....H..........
000001f0: d648 89c2 81ce 0000 00c0 e800 0000 0041  .H.............A
00000200: 89c5 85c0 753d 4863 45d4 4889 c24c 39f0  ....u=HcE.H..L9.
00000210: 754e 488b 45d8 6548 2b04 2528 0000 0075  uNH.E.eH+.%(...u
00000220: 6248 83c4 1044 89e8 5b41 5c41 5d41 5e5d  bH...D..[A\A]A^]
00000230: 31d2 31c9 31f6 31ff 4531 c045 31c9 e900  1.1.1.1.E1.E1...
00000240: 0000 004d 85e4 7404 4c8b 6328 4489 ea48  ...M..t.L.c(D..H
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00000270: 0000 004c 89e7 41bd fbff ffff e800 0000  ...L..A.........
00000280: 00eb 8fe8 0000 0000 0f1f 8400 0000 0000  ................
00000290: 9090 9090 9090 9090 9090 9090 9090 9090  ................
000002a0: e800 0000 0055 4889 e541 5741 5649 89f6  .....UH..AWAVI..
000002b0: 4155 4c8d 6f20 4154 41bc 0200 0000 5348  AUL.o ATA.....SH
000002c0: 89fb 4883 ec28 4889 55b0 894d c465 488b  ..H..(H.U..M.eH.
000002d0: 0425 2800 0000 4889 45d0 488b 07c7 45cc  .%(...H.E.H...E.
000002e0: 0000 0000 8955 c04c 8b78 4049 8d87 58ff  .....U.L.x@I..X.
000002f0: ffff 4889 45b8 8b43 108b 4dc0 41b9 e803  ..H.E..C..M.A...
00000300: 0000 4c8d 45cc 418b b758 ffff ff48 8b7d  ..L.E.A..X...H.}
00000310: b84c 89f2 c1e0 0fc1 e608 09c6 81ce 8000  .L..............
00000320: 00c0 e800 0000 0085 c075 7241 8b56 1081  .........urA.V..
00000330: fa59 4445 520f 8584 0000 0041 83fc 0175  .YDER......A...u
00000340: 514d 85ed 7404 4c8b 6b28 48c7 c600 0000  QM..t.L.k(H.....
00000350: 004c 89ef e800 0000 00b8 fbff ffff 488b  .L............H.
00000360: 55d0 6548 2b14 2528 0000 000f 85ab 0000  U.eH+.%(........
00000370: 0048 83c4 285b 415c 415d 415e 415f 5d31  .H..([A\A]A^A_]1
00000380: d231 c931 f631 ff45 31c0 4531 c9e9 0000  .1.1.1.E1.E1....
00000390: 0000 41bc 0100 0000 e959 ffff ff4d 85ed  ..A......Y...M..
000003a0: 7404 4c8b 6b28 89c2 48c7 c600 0000 004c  t.L.k(..H......L
000003b0: 89ef 8945 b8e8 0000 0000 8b45 b8eb 9f48  ...E.......E...H
000003c0: 634d cc48 8b7d b048 89ce 4839 f975 2a3b  cM.H.}.H..H9.u*;
000003d0: 55c4 748a 498d 4e10 4d85 ed74 044c 8b6b  U.t.I.N.M..t.L.k
000003e0: 2848 8d55 c448 c7c6 0000 0000 4c89 efe8  (H.U.H......L...
000003f0: 0000 0000 e960 ffff ff4d 85ed 7404 4c8b  .....`...M..t.L.
00000400: 6b28 488b 4db0 89f2 4c89 ef48 c7c6 0000  k(H.M...L..H....
00000410: 0000 e800 0000 00e9 3dff ffff e800 0000  ........=.......
00000420: 0066 662e 0f1f 8400 0000 0000 0f1f 4000  .ff...........@.
00000430: 9090 9090 9090 9090 9090 9090 9090 9090  ................
00000440: e800 0000 0055 488b 0748 8db0 1806 0000  .....UH..H......
00000450: 4889 e5e8 0000 0000 5d31 f631 ffe9 0000  H.......]1.1....
00000460: 0000 6666 2e0f 1f84 0000 0000 000f 1f00  ..ff............
00000470: 9090 9090 9090 9090 9090 9090 9090 9090  ................
00000480: e800 0000 0055 488b 0748 8d90 1806 0000  .....UH..H......
00000490: 4889 e5e8 0000 0000 5d31 d231 f631 ffe9  H.......]1.1.1..
000004a0: 0000 0000 6666 2e0f 1f84 0000 0000 0090  ....ff..........
000004b0: 9090 9090 9090 9090 9090 9090 9090 9090  ................
000004c0: e800 0000 0055 488b be48 0100 0048 89e5  .....UH..H...H..
000004d0: 5348 89f3 e800 0000 0048 8bbb 5001 0000  SH.......H..P...
000004e0: e800 0000 0048 89df e800 0000 0048 89df  .....H.......H..
000004f0: e800 0000 0048 8b5d f8c9 31f6 31ff e900  .....H.]..1.1...
00000500: 0000 0066 662e 0f1f 8400 0000 0000 6690  ...ff.........f.
00000510: 9090 9090 9090 9090 9090 9090 9090 9090  ................
00000520: e800 0000 0055 4889 e541 5453 488b 9fd8  .....UH..ATSH...
00000530: 0400 0048 85db 7450 4989 fcba c00c 0000  ...H..tPI.......
00000540: 4889 dfbe 6801 0000 e800 0000 0048 89c3  H...h........H..
00000550: 4885 c074 2148 c780 4801 0000 0000 0000  H..t!H..H.......
00000560: 4889 c64c 89e7 48c7 8050 0100 0000 0000  H..L..H..P......
00000570: 00e8 0000 0000 4889 d85b 415c 5d31 d231  ......H..[A\]1.1
00000580: f631 ffe9 0000 0000 0f0b 4889 d85b 415c  .1........H..[A\
00000590: 5d31 d231 f631 ffe9 0000 0000 0f1f 4000  ]1.1.1........@.
000005a0: 9090 9090 9090 9090 9090 9090 9090 9090  ................
000005b0: e800 0000 0055 4889 e541 5741 5641 5541  .....UH..AWAVAUA
000005c0: 5453 4883 e4f0 4881 ecb0 0000 004c 8b2f  TSH...H......L./
000005d0: 488b 9fd8 0400 0065 488b 0425 2800 0000  H......eH..%(...
000005e0: 4889 8424 a800 0000 31c0 8b87 cc04 0000  H..$....1.......
000005f0: c744 244c 0000 0000 4c89 ef48 c1e0 0548  .D$L....L..H...H
00000600: 0346 1848 8d74 244c 4c8b 7810 e800 0000  .F.H.t$LL.x.....
00000610: 0084 c075 3a48 8b84 24a8 0000 0065 482b  ...u:H..$....eH+
00000620: 0425 2800 0000 0f85 0803 0000 488d 65d8  .%(.........H.e.
00000630: 5b41 5c41 5d41 5e41 5f5d 31c0 31d2 31c9  [A\A]A^A_]1.1.1.
00000640: 31f6 31ff 4531 c045 31c9 e900 0000 0048  1.1.E1.E1......H
00000650: 8b83 5001 0000 48c7 8424 8000 0000 0000  ..P...H..$......
00000660: 0000 48c7 8424 8800 0000 0000 0000 4889  ..H..$........H.
00000670: 4424 1848 8b83 4801 0000 48c7 8424 9000  D$.H..H...H..$..
00000680: 0000 0000 0000 48c7 8424 9800 0000 0000  ......H..$......
00000690: 0000 48c7 8424 a000 0000 0000 0000 4c8b  ..H..$........L.
000006a0: 7310 4889 4424 28e8 0000 0000 4889 4424  s.H.D$(.....H.D$
000006b0: 3048 8b83 6001 0000 48c7 4424 6000 0000  0H..`...H.D$`...
000006c0: 0048 c744 2468 0000 0000 4889 4424 2048  .H.D$h....H.D$ H
000006d0: 85c0 7450 488b 8358 0100 00be 0200 0000  ..tPH..X........
000006e0: 4c89 f74c 896c 2410 4889 4424 08e8 0000  L..L.l$.H.D$....
000006f0: 0000 85c0 743c 4d85 ed74 0949 8b5d 0848  ....t<M..t.I.].H
00000700: 895c 2410 488b 7c24 1089 c248 c7c6 0000  .\$.H.|$...H....
00000710: 0000 e800 0000 00be 0200 0000 4c89 f7e8  ............L...
00000720: 0000 0000 8b7c 244c e800 0000 00e9 e3fe  .....|$L........
00000730: ffff 488b 4c24 284c 89fe 4889 da48 b802  ..H.L$(L..H..H..
00000740: 0012 0009 0000 0048 8dbc 2480 0000 0048  .......H..$....H
00000750: 8901 8b44 2408 4c8d 6130 4d89 e783 e810  ...D$.L.a0M.....
00000760: 8941 0cb8 0100 0000 6689 4110 0fb6 4424  .A......f.A...D$
00000770: 3088 4112 e800 0000 0048 8d74 2460 488d  0.A......H.t$`H.
00000780: bc24 8000 0000 e800 0000 0084 c00f 84f1  .$..............
00000790: 0000 0048 8b43 7c8b 4c24 6448 8d74 2460  ...H.C|.L$dH.t$`
000007a0: 488d 7c24 7048 8b93 8400 0000 448b 6424  H.|$pH......D.d$
000007b0: 6048 c744 2458 0000 0000 4889 4424 7049  `H.D$X....H.D$pI
000007c0: 8d47 0c48 8954 2478 8b54 246c 4889 4424  .G.H.T$x.T$lH.D$
000007d0: 508b 4424 6889 5424 4089 4424 4489 4c24  P.D$h.T$@.D$D.L$
000007e0: 3ce8 0000 0000 84c0 748f 8b44 2444 8b54  <.......t..D$D.T
000007f0: 2440 8b4c 243c 4429 e029 ca0f afc2 488d  $@.L$<D).)....H.
00000800: 9308 0100 0044 8d24 408b 4424 6466 4189  .....D.$@.D$dfA.
00000810: 0741 8b45 fc66 2b44 2468 6641 8947 028b  .A.E.f+D$hfA.G..
00000820: 4424 6c2b 4424 6466 4189 4704 8b44 2468  D$l+D$dfA.G..D$h
00000830: 2b44 2460 4589 6708 6641 8947 0649 8b46  +D$`E.g.fA.G.I.F
00000840: 4881 3858 5232 3474 1e4c 8d44 2460 4c89  H.8XR24t.L.D$`L.
00000850: f148 8d7c 2450 31f6 e800 0000 004f 8d7c  .H.|$P1......O.|
00000860: 270c e912 ffff ff4c 8d44 2460 4c89 f148  '......L.D$`L..H
00000870: 8d7c 2450 31f6 4c8d 8bb0 0000 00e8 0000  .|$P1.L.........
00000880: 0000 ebd9 488b 4424 2048 8b74 2428 498d  ....H.D$ H.t$(I.
00000890: 5de0 488b 5424 0848 89df 4c8d 6406 3048  ].H.T$.H..L.d.0H
000008a0: 8b44 2430 41c7 4424 0cfe ff00 0041 c744  .D$0A.D$.....A.D
000008b0: 241c 0100 0800 41c7 4424 3402 0008 0041  $.....A.D$4....A
000008c0: c744 244c ffff 0000 4989 4424 20e8 bef8  .D$L....I.D$ ...
000008d0: ffff 85c0 0f85 3dfe ffff 4c8b 7c24 18b9  ......=...L.|$..
000008e0: 4c43 4455 ba28 0000 0048 89df 4c89 fee8  LCDU.(...H..L...
000008f0: acf9 ffff 85c0 0f85 1bfe ffff 498b 5720  ............I.W 
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00001340: e800 0000 0055 48c7 c200 0000 0048 c7c6  .....UH......H..
00001350: 0000 0000 48c7 c700 0000 0048 89e5 e800  ....H......H....
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00001380: 5548 c7c7 0000 0000 4889 e5e8 0000 0000  UH......H.......
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000013c0: 00e8 0000 0000 e900 0000 0061 7070 6c65  ...........apple
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00001460: 6172 2044 524d 2044 7269 7665 7200 0000  ar DRM Driver...
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000014b0: 0000 0000 0000 0000 0000 0000 0000 0000  ................
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000014d0: 0000 0000 0000 0000 0000 0000 0000 0000  ................
000014e0: 0000 0000 0000 0000 0000 0000 0000 0000  ................
000014f0: 5b64 726d 5d20 2a45 5252 4f52 2a20 4661  [drm] *ERROR* Fa
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00001520: 5b64 726d 5d20 2a45 5252 4f52 2a20 4163  [drm] *ERROR* Ac
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000015a0: 5252 4f52 2a20 456e 636f 756e 7465 7265  RROR* Encountere
000015b0: 6420 756e 6578 7065 6374 6564 2072 6561  d unexpected rea
000015c0: 6469 6e65 7373 2073 6967 6e61 6c0a 0000  diness signal...
000015d0: 5b64 726d 5d20 2a45 5252 4f52 2a20 556e  [drm] *ERROR* Un
000015e0: 6578 7065 6374 6564 2072 6573 706f 6e73  expected respons
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00001600: 7870 6563 7465 6420 2570 3463 6820 666f  xpected %p4ch fo
00001610: 756e 6420 2570 3463 6829 0a00 0000 0000  und %p4ch)......
00001620: 5b64 726d 5d20 2a45 5252 4f52 2a20 4661  [drm] *ERROR* Fa
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00001650: 6365 7373 2028 2564 290a 0000 0000 0000  cess (%d).......
00001660: 5b64 726d 5d20 2a45 5252 4f52 2a20 5265  [drm] *ERROR* Re
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000016d0: 5b64 726d 5d20 2a45 5252 4f52 2a20 456e  [drm] *ERROR* En
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00001710: 5b64 726d 5d20 2a45 5252 4f52 2a20 456e  [drm] *ERROR* En
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00001760: 666f 726d 6174 696f 6e0a 0000 0000 0000  formation.......
00001770: 4661 696c 6564 2074 6f20 696e 6974 6961  Failed to initia
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00001790: 7572 6174 696f 6e0a 0000 0000 0000 0000  uration.........
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00001800: 6f20 696e 6974 6961 6c69 7a65 2063 6f6e  o initialize con
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00001830: 6e74 6174 696f 6e0a 0000 0000 0000 0000  ntation.........
00001840: 4661 696c 6564 2074 6f20 7365 7420 6e6f  Failed to set no
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000018a0: 6f20 7265 6769 7374 6572 2044 524d 2064  o register DRM d
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00001900: 2f6c 696e 7578 2d68 6561 6465 7273 2d36  /linux-headers-6
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00008680: 9000 0000 0000 0000 2700 0000 0500 0000  ........'.......
00008690: 0800 0000 0000 0000 1800 0000 0000 0000  ................
000086a0: 5a00 0000 0100 0000 0600 0000 0000 0000  Z...............
000086b0: 0000 0000 0000 0000 7013 0000 0000 0000  ........p.......
000086c0: 2800 0000 0000 0000 0000 0000 0000 0000  (...............
000086d0: 1000 0000 0000 0000 0000 0000 0000 0000  ................
000086e0: 5500 0000 0400 0000 4000 0000 0000 0000  U.......@.......
000086f0: 0000 0000 0000 0000 486c 0000 0000 0000  ........Hl......
00008700: 4800 0000 0000 0000 2700 0000 0700 0000  H.......'.......
00008710: 0800 0000 0000 0000 1800 0000 0000 0000  ................
00008720: 6a00 0000 0100 0000 0600 0000 0000 0000  j...............
00008730: 0000 0000 0000 0000 9813 0000 0000 0000  ................
00008740: 3300 0000 0000 0000 0000 0000 0000 0000  3...............
00008750: 0100 0000 0000 0000 0000 0000 0000 0000  ................
00008760: 6500 0000 0400 0000 4000 0000 0000 0000  e.......@.......
00008770: 0000 0000 0000 0000 906c 0000 0000 0000  .........l......
00008780: 9000 0000 0000 0000 2700 0000 0900 0000  ........'.......
00008790: 0800 0000 0000 0000 1800 0000 0000 0000  ................
000087a0: 7900 0000 0100 0000 3200 0000 0000 0000  y.......2.......
000087b0: 0000 0000 0000 0000 cb13 0000 0000 0000  ................
000087c0: a300 0000 0000 0000 0000 0000 0000 0000  ................
000087d0: 0100 0000 0000 0000 0100 0000 0000 0000  ................
000087e0: 8d00 0000 0100 0000 0200 0000 0000 0000  ................
000087f0: 0000 0000 0000 0000 6e14 0000 0000 0000  ........n.......
00008800: 8000 0000 0000 0000 0000 0000 0000 0000  ................
00008810: 0100 0000 0000 0000 0000 0000 0000 0000  ................
00008820: 8800 0000 0400 0000 4000 0000 0000 0000  ........@.......
00008830: 0000 0000 0000 0000 206d 0000 0000 0000  ........ m......
00008840: 8001 0000 0000 0000 2700 0000 0c00 0000  ........'.......
00008850: 0800 0000 0000 0000 1800 0000 0000 0000  ................
00008860: 9a00 0000 0100 0000 3200 0000 0000 0000  ........2.......
00008870: 0000 0000 0000 0000 f014 0000 0000 0000  ................
00008880: 4804 0000 0000 0000 0000 0000 0000 0000  H...............
00008890: 0800 0000 0000 0000 0100 0000 0000 0000  ................
000088a0: a900 0000 0100 0000 0200 0000 0000 0000  ................
000088b0: 0000 0000 0000 0000 3819 0000 0000 0000  ........8.......
000088c0: 1101 0000 0000 0000 0000 0000 0000 0000  ................
000088d0: 0100 0000 0000 0000 0000 0000 0000 0000  ................
000088e0: b700 0000 0100 0000 0200 0000 0000 0000  ................
000088f0: 0000 0000 0000 0000 601a 0000 0000 0000  ........`.......
00008900: c805 0000 0000 0000 0000 0000 0000 0000  ................
00008910: 2000 0000 0000 0000 0000 0000 0000 0000   ...............
00008920: b200 0000 0400 0000 4000 0000 0000 0000  ........@.......
00008930: 0000 0000 0000 0000 a06e 0000 0000 0000  .........n......
00008940: 0804 0000 0000 0000 2700 0000 1000 0000  ........'.......
00008950: 0800 0000 0000 0000 1800 0000 0000 0000  ................
00008960: c400 0000 0100 0000 0200 0000 0000 0000  ................
00008970: 0000 0000 0000 0000 2820 0000 0000 0000  ........( ......
00008980: 4c00 0000 0000 0000 0000 0000 0000 0000  L...............
00008990: 0100 0000 0000 0000 0000 0000 0000 0000  ................
000089a0: bf00 0000 0400 0000 4000 0000 0000 0000  ........@.......
000089b0: 0000 0000 0000 0000 a872 0000 0000 0000  .........r......
000089c0: c801 0000 0000 0000 2700 0000 1200 0000  ........'.......
000089d0: 0800 0000 0000 0000 1800 0000 0000 0000  ................
000089e0: d700 0000 0100 0000 0200 0000 0000 0000  ................
000089f0: 0000 0000 0000 0000 7420 0000 0000 0000  ........t ......
00008a00: bc01 0000 0000 0000 0000 0000 0000 0000  ................
00008a10: 0100 0000 0000 0000 0000 0000 0000 0000  ................
00008a20: d200 0000 0400 0000 4000 0000 0000 0000  ........@.......
00008a30: 0000 0000 0000 0000 7074 0000 0000 0000  ........pt......
00008a40: 680a 0000 0000 0000 2700 0000 1400 0000  h.......'.......
00008a50: 0800 0000 0000 0000 1800 0000 0000 0000  ................
00008a60: e300 0000 0100 0000 0200 0000 0000 0000  ................
00008a70: 0000 0000 0000 0000 4022 0000 0000 0000  ........@"......
00008a80: c013 0000 0000 0000 0000 0000 0000 0000  ................
00008a90: 2000 0000 0000 0000 0000 0000 0000 0000   ...............
00008aa0: f300 0000 0100 0000 0300 0000 0000 0000  ................
00008ab0: 0000 0000 0000 0000 0036 0000 0000 0000  .........6......
00008ac0: 1800 0000 0000 0000 0000 0000 0000 0000  ................
00008ad0: 0800 0000 0000 0000 0000 0000 0000 0000  ................
00008ae0: ee00 0000 0400 0000 4000 0000 0000 0000  ........@.......
00008af0: 0000 0000 0000 0000 d87e 0000 0000 0000  .........~......
00008b00: 6000 0000 0000 0000 2700 0000 1700 0000  `.......'.......
00008b10: 0800 0000 0000 0000 1800 0000 0000 0000  ................
00008b20: 0401 0000 0100 0000 8300 0000 0000 0000  ................
00008b30: 1800 0000 0000 0000 1836 0000 0000 0000  .........6......
00008b40: 8800 0000 0000 0000 0500 0000 0000 0000  ................
00008b50: 0800 0000 0000 0000 0000 0000 0000 0000  ................
00008b60: ff00 0000 0400 0000 4000 0000 0000 0000  ........@.......
00008b70: 0000 0000 0000 0000 387f 0000 0000 0000  ........8.......
00008b80: 9801 0000 0000 0000 2700 0000 1900 0000  ........'.......
00008b90: 0800 0000 0000 0000 1800 0000 0000 0000  ................
00008ba0: 2101 0000 0100 0000 0100 0000 0000 0000  !...............
00008bb0: 0000 0000 0000 0000 a036 0000 0000 0000  .........6......
00008bc0: 0000 0000 0000 0000 0000 0000 0000 0000  ................
00008bd0: 0100 0000 0000 0000 0000 0000 0000 0000  ................
00008be0: 3501 0000 0100 0000 3000 0000 0000 0000  5.......0.......
00008bf0: 0000 0000 0000 0000 a036 0000 0000 0000  .........6......
00008c00: 8400 0000 0000 0000 0000 0000 0000 0000  ................
00008c10: 0100 0000 0000 0000 0100 0000 0000 0000  ................
00008c20: 3e01 0000 0100 0000 0000 0000 0000 0000  >...............
00008c30: 0000 0000 0000 0000 2437 0000 0000 0000  ........$7......
00008c40: 0000 0000 0000 0000 0000 0000 0000 0000  ................
00008c50: 0100 0000 0000 0000 0000 0000 0000 0000  ................
00008c60: 5301 0000 0100 0000 0300 0000 0000 0000  S...............
00008c70: a000 0000 0000 0000 4037 0000 0000 0000  ........@7......
00008c80: 3e02 0000 0000 0000 0000 0000 0000 0000  >...............
00008c90: 2000 0000 0000 0000 0000 0000 0000 0000   ...............
00008ca0: 4e01 0000 0400 0000 4000 0000 0000 0000  N.......@.......
00008cb0: 0000 0000 0000 0000 d080 0000 0000 0000  ................
00008cc0: 1002 0000 0000 0000 2700 0000 1e00 0000  ........'.......
00008cd0: 0800 0000 0000 0000 1800 0000 0000 0000  ................
00008ce0: 5e01 0000 0100 0000 0300 0000 0000 0000  ^...............
00008cf0: 0000 0000 0000 0000 8039 0000 0000 0000  .........9......
00008d00: 0800 0000 0000 0000 0000 0000 0000 0000  ................
00008d10: 0800 0000 0000 0000 0000 0000 0000 0000  ................
00008d20: 5901 0000 0400 0000 4000 0000 0000 0000  Y.......@.......
00008d30: 0000 0000 0000 0000 e082 0000 0000 0000  ................
00008d40: 1800 0000 0000 0000 2700 0000 2000 0000  ........'... ...
00008d50: 0800 0000 0000 0000 1800 0000 0000 0000  ................
00008d60: 6e01 0000 0100 0000 0300 0000 0000 0000  n...............
00008d70: 0000 0000 0000 0000 8839 0000 0000 0000  .........9......
00008d80: 0800 0000 0000 0000 0000 0000 0000 0000  ................
00008d90: 0800 0000 0000 0000 0000 0000 0000 0000  ................
00008da0: 6901 0000 0400 0000 4000 0000 0000 0000  i.......@.......
00008db0: 0000 0000 0000 0000 f882 0000 0000 0000  ................
00008dc0: 1800 0000 0000 0000 2700 0000 2200 0000  ........'..."...
00008dd0: 0800 0000 0000 0000 1800 0000 0000 0000  ................
00008de0: 7e01 0000 0100 0000 0300 0000 0000 0000  ~...............
00008df0: 0000 0000 0000 0000 c039 0000 0000 0000  .........9......
00008e00: 0005 0000 0000 0000 0000 0000 0000 0000  ................
00008e10: 4000 0000 0000 0000 0000 0000 0000 0000  @...............
00008e20: 7901 0000 0400 0000 4000 0000 0000 0000  y.......@.......
00008e30: 0000 0000 0000 0000 1083 0000 0000 0000  ................
00008e40: 3000 0000 0000 0000 2700 0000 2400 0000  0.......'...$...
00008e50: 0800 0000 0000 0000 1800 0000 0000 0000  ................
00008e60: 9801 0000 0800 0000 0300 0000 0000 0000  ................
00008e70: 0000 0000 0000 0000 c03e 0000 0000 0000  .........>......
00008e80: 0000 0000 0000 0000 0000 0000 0000 0000  ................
00008e90: 0100 0000 0000 0000 0000 0000 0000 0000  ................
00008ea0: 0100 0000 0200 0000 0000 0000 0000 0000  ................
00008eb0: 0000 0000 0000 0000 c03e 0000 0000 0000  .........>......
00008ec0: b010 0000 0000 0000 2800 0000 5c00 0000  ........(...\...
00008ed0: 0800 0000 0000 0000 1800 0000 0000 0000  ................
00008ee0: 0900 0000 0300 0000 0000 0000 0000 0000  ................
00008ef0: 0000 0000 0000 0000 704f 0000 0000 0000  ........pO......
00008f00: 5b0d 0000 0000 0000 0000 0000 0000 0000  [...............
00008f10: 0100 0000 0000 0000 0000 0000 0000 0000  ................
00008f20: 1100 0000 0300 0000 0000 0000 0000 0000  ................
00008f30: 0000 0000 0000 0000 4083 0000 0000 0000  ........@.......
00008f40: 9d01 0000 0000 0000 0000 0000 0000 0000  ................
00008f50: 0100 0000 0000 0000 0000 0000 0000 0000  ................

Re: [PATCH v3 3/3] drm/tiny: add driver for Apple Touch Bars in x86 Macs

[andriy.shevchenko]

On Mon, Feb 24, 2025 at 11:20:12AM +0000, Aditya Garg wrote:
> 
> > 
> > It would be nice to see the difference in the code generation for the all
> > __packed vs. only those that require it.
> > 
> >> At least it's clear then
> >> what happens. And if your hardware requires this, you can't do much anyway.
> > 
> > One aspect (member level alignment) is clear but the other is not
> > (object level alignment). I dunno if it makes sense to be pedantic about this,
> > but would like to see the binary outcome asked for.
> 
> Hex dump of the compiled binary:

Oh, sorry I wasn't clear. We have a script called bloat-o-meter for these
purposes. Please, run it with old and new binaries as parameters and share the
output.

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v3 3/3] drm/tiny: add driver for Apple Touch Bars in x86 Macs

[Aditya Garg]

> On 24 Feb 2025, at 5:13 PM, andriy.shevchenko@linux.intel.com wrote:
> 
> On Mon, Feb 24, 2025 at 11:20:12AM +0000, Aditya Garg wrote:
>> 
>>> 
>>> It would be nice to see the difference in the code generation for the all
>>> __packed vs. only those that require it.
>>> 
>>>> At least it's clear then
>>>> what happens. And if your hardware requires this, you can't do much anyway.
>>> 
>>> One aspect (member level alignment) is clear but the other is not
>>> (object level alignment). I dunno if it makes sense to be pedantic about this,
>>> but would like to see the binary outcome asked for.
>> 
>> Hex dump of the compiled binary:
> 
> Oh, sorry I wasn't clear. We have a script called bloat-o-meter for these
> purposes. Please, run it with old and new binaries as parameters and share the
> output.

aditya@MacBook:~/linux$ ./scripts/bloat-o-meter $PACKED $UNPACKED
add/remove: 0/0 grow/shrink: 0/0 up/down: 0/0 (0)
Function                                     old     new   delta
Total: Before=13286, After=13286, chg +0.00%

aditya@MacBook:~/linux$ ./scripts/bloat-o-meter $PACKED $UNPACKED -c
add/remove: 0/0 grow/shrink: 0/0 up/down: 0/0 (0)
Function                                     old     new   delta
Total: Before=4957, After=4957, chg +0.00%
add/remove: 0/0 grow/shrink: 0/0 up/down: 0/0 (0)
Data                                         old     new   delta
Total: Before=1560, After=1560, chg +0.00%
add/remove: 0/0 grow/shrink: 0/0 up/down: 0/0 (0)
RO Data                                      old     new   delta
Total: Before=6769, After=6769, chg +0.00%

aditya@MacBook:~/linux$ ./scripts/bloat-o-meter $PACKED $UNPACKED -d
add/remove: 0/0 grow/shrink: 0/0 up/down: 0/0 (0)
Data                                         old     new   delta
Total: Before=8329, After=8329, chg +0.00%

aditya@MacBook:~/linux$ ./scripts/bloat-o-meter $PACKED $UNPACKED -t
add/remove: 0/0 grow/shrink: 0/0 up/down: 0/0 (0)
Function                                     old     new   delta
Total: Before=4957, After=4957, chg +0.00%

> 
> --
> With Best Regards,
> Andy Shevchenko
> 
> 

Re: [PATCH v3 3/3] drm/tiny: add driver for Apple Touch Bars in x86 Macs

[andriy.shevchenko]

On Mon, Feb 24, 2025 at 11:57:47AM +0000, Aditya Garg wrote:
> > On 24 Feb 2025, at 5:13 PM, andriy.shevchenko@linux.intel.com wrote:
> > On Mon, Feb 24, 2025 at 11:20:12AM +0000, Aditya Garg wrote:
> >> 
> >>> It would be nice to see the difference in the code generation for the all
> >>> __packed vs. only those that require it.
> >>> 
> >>>> At least it's clear then
> >>>> what happens. And if your hardware requires this, you can't do much anyway.
> >>> 
> >>> One aspect (member level alignment) is clear but the other is not
> >>> (object level alignment). I dunno if it makes sense to be pedantic about this,
> >>> but would like to see the binary outcome asked for.
> >> 
> >> Hex dump of the compiled binary:
> > 
> > Oh, sorry I wasn't clear. We have a script called bloat-o-meter for these
> > purposes. Please, run it with old and new binaries as parameters and share the
> > output.

> aditya@MacBook:~/linux$ ./scripts/bloat-o-meter $PACKED $UNPACKED
> add/remove: 0/0 grow/shrink: 0/0 up/down: 0/0 (0)
> Function                                     old     new   delta
> Total: Before=13286, After=13286, chg +0.00%

Thanks! That shows that __packed can be used for all protocol related data
types. Just mention in the commit message that the __packed, even if not
needed, is: a) for the consistency, b) not affecting code generation in
accordance with bloat-o-meter.

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v3 3/3] drm/tiny: add driver for Apple Touch Bars in x86 Macs

[Thomas Zimmermann]

Hi

Am 21.02.25 um 12:37 schrieb Aditya Garg:
> From: Kerem Karabay <kekrby@gmail.com>
>
> The Touch Bars found on x86 Macs support two USB configurations: one
> where the device presents itself as a HID keyboard and can display
> predefined sets of keys, and one where the operating system has full
> control over what is displayed.
>
> This commit adds support for the display functionality of the second
> configuration. Functionality for the first configuration has been
> merged in the HID tree.
>
> Note that this driver has only been tested on T2 Macs, and only includes
> the USB device ID for these devices. Testing on T1 Macs would be
> appreciated.
>
> Credit goes to Ben (Bingxing) Wang on GitHub [1] for reverse engineering
> most of the protocol.
>
> [1]: https://github.com/imbushuo/DFRDisplayKm
>
> Signed-off-by: Kerem Karabay <kekrby@gmail.com>
> Co-developed-by: Atharva Tiwari <evepolonium@gmail.com>
> Signed-off-by: Atharva Tiwari <evepolonium@gmail.com>
> Co-developed-by: Aditya Garg <gargaditya08@live.com>
> Signed-off-by: Aditya Garg <gargaditya08@live.com>
> Signed-off-by: Aun-Ali Zaidi <admin@kodeit.net>
> ---
> v2 ->
> - Add the driver to MAINTAINERS.
> - Allocate memory for request and response in plane's atomic-check helper
> - Void the use of drm_fb_blit()
> - Implement atomic_disable
> - Make PRIME work
> - Remove the date field from struct drm_driver
> - intersect damage with dst_clip
> - Register DRM device in appletbdrm_probe
> - Clear the display as the final call in probe
> - Select hid_multitouch as well in kconfig
>
> v3 ->
> - Change commit message to credit Ben (Bingxing) Wang
>   MAINTAINERS                       |   7 +
>   drivers/gpu/drm/tiny/Kconfig      |  14 +
>   drivers/gpu/drm/tiny/Makefile     |   1 +
>   drivers/gpu/drm/tiny/appletbdrm.c | 806 ++++++++++++++++++++++++++++++
>   4 files changed, 828 insertions(+)
>   create mode 100644 drivers/gpu/drm/tiny/appletbdrm.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index efee40ea5..43fafaab3 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -7148,6 +7148,13 @@ S:	Supported
>   T:	git https://gitlab.freedesktop.org/drm/misc/kernel.git
>   F:	drivers/gpu/drm/sun4i/sun8i*
>   
> +DRM DRIVER FOR APPLE TOUCH BARS
> +M:	Aun-Ali Zaidi <admin@kodeit.net>

You cannot put someone else here. Who is that?

> +L:	dri-devel@lists.freedesktop.org
> +S:	Maintained
> +T:	git https://gitlab.freedesktop.org/drm/misc/kernel.git
> +F:	drivers/gpu/drm/tiny/appletbdrm.c
> +
>   DRM DRIVER FOR ARM PL111 CLCD
>   M:	Linus Walleij <linus.walleij@linaro.org>
>   S:	Maintained
> diff --git a/drivers/gpu/drm/tiny/Kconfig b/drivers/gpu/drm/tiny/Kconfig
> index 94cbdb133..25471791c 100644
> --- a/drivers/gpu/drm/tiny/Kconfig
> +++ b/drivers/gpu/drm/tiny/Kconfig
> @@ -1,5 +1,19 @@
>   # SPDX-License-Identifier: GPL-2.0-only
>   
> +config DRM_APPLETBDRM
> +	tristate "DRM support for Apple Touch Bars"
> +	depends on DRM && USB && MMU
> +	select DRM_GEM_SHMEM_HELPER
> +	select DRM_KMS_HELPER
> +	select HID_APPLETB_BL
> +	select HID_MULTITOUCH
> +	help
> +	  Say Y here if you want support for the display of Touch Bars on x86
> +	  MacBook Pros.
> +
> +	  To compile this driver as a module, choose M here: the
> +	  module will be called appletbdrm.
> +
>   config DRM_ARCPGU
>   	tristate "ARC PGU"
>   	depends on DRM && OF
> diff --git a/drivers/gpu/drm/tiny/Makefile b/drivers/gpu/drm/tiny/Makefile
> index 60816d2eb..0a3a7837a 100644
> --- a/drivers/gpu/drm/tiny/Makefile
> +++ b/drivers/gpu/drm/tiny/Makefile
> @@ -1,5 +1,6 @@
>   # SPDX-License-Identifier: GPL-2.0-only
>   
> +obj-$(CONFIG_DRM_APPLETBDRM)		+= appletbdrm.o
>   obj-$(CONFIG_DRM_ARCPGU)		+= arcpgu.o
>   obj-$(CONFIG_DRM_BOCHS)			+= bochs.o
>   obj-$(CONFIG_DRM_CIRRUS_QEMU)		+= cirrus-qemu.o
> diff --git a/drivers/gpu/drm/tiny/appletbdrm.c b/drivers/gpu/drm/tiny/appletbdrm.c

Putting this driver into tiny is ok. It's the preferred place for 
single-file DRM drivers like this one.

> new file mode 100644
> index 000000000..a17a3ecc3
> --- /dev/null
> +++ b/drivers/gpu/drm/tiny/appletbdrm.c
> @@ -0,0 +1,806 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Apple Touch Bar DRM Driver
> + *
> + * Copyright (c) 2023 Kerem Karabay <kekrby@gmail.com>
> + */
> +
> +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> +
> +#include <linux/module.h>
> +#include <linux/unaligned.h>
> +#include <linux/usb.h>
> +
> +#include <drm/drm_atomic.h>
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_crtc.h>
> +#include <drm/drm_damage_helper.h>
> +#include <drm/drm_drv.h>
> +#include <drm/drm_encoder.h>
> +#include <drm/drm_format_helper.h>
> +#include <drm/drm_fourcc.h>
> +#include <drm/drm_framebuffer.h>
> +#include <drm/drm_gem_atomic_helper.h>
> +#include <drm/drm_gem_framebuffer_helper.h>
> +#include <drm/drm_gem_shmem_helper.h>
> +#include <drm/drm_plane.h>
> +#include <drm/drm_probe_helper.h>
> +
> +#define __APPLETBDRM_MSG_STR4(str4)	((__le32 __force)((str4[0] << 24) | (str4[1] << 16) | (str4[2] << 8) | str4[3]))
> +#define __APPLETBDRM_MSG_TOK4(tok4)	__APPLETBDRM_MSG_STR4(#tok4)
> +
> +#define APPLETBDRM_PIXEL_FORMAT		__APPLETBDRM_MSG_TOK4(RGBA) /* The actual format is BGR888 */
> +#define APPLETBDRM_BITS_PER_PIXEL	24
> +
> +#define APPLETBDRM_MSG_CLEAR_DISPLAY	__APPLETBDRM_MSG_TOK4(CLRD)
> +#define APPLETBDRM_MSG_GET_INFORMATION	__APPLETBDRM_MSG_TOK4(GINF)
> +#define APPLETBDRM_MSG_UPDATE_COMPLETE	__APPLETBDRM_MSG_TOK4(UDCL)
> +#define APPLETBDRM_MSG_SIGNAL_READINESS	__APPLETBDRM_MSG_TOK4(REDY)
> +
> +#define APPLETBDRM_BULK_MSG_TIMEOUT	1000
> +
> +#define drm_to_adev(_drm)		container_of(_drm, struct appletbdrm_device, drm)
> +#define adev_to_udev(adev)		interface_to_usbdev(to_usb_interface(adev->dev))
> +
> +struct appletbdrm_msg_request_header {
> +	__le16 unk_00;
> +	__le16 unk_02;
> +	__le32 unk_04;
> +	__le32 unk_08;
> +	__le32 size;
> +} __packed;
> +
> +struct appletbdrm_msg_response_header {
> +	u8 unk_00[16];
> +	__le32 msg;
> +} __packed;
> +
> +struct appletbdrm_msg_simple_request {
> +	struct appletbdrm_msg_request_header header;
> +	__le32 msg;
> +	u8 unk_14[8];
> +	__le32 size;
> +} __packed;
> +
> +struct appletbdrm_msg_information {
> +	struct appletbdrm_msg_response_header header;
> +	u8 unk_14[12];
> +	__le32 width;
> +	__le32 height;
> +	u8 bits_per_pixel;
> +	__le32 bytes_per_row;
> +	__le32 orientation;
> +	__le32 bitmap_info;
> +	__le32 pixel_format;
> +	__le32 width_inches;	/* floating point */
> +	__le32 height_inches;	/* floating point */
> +} __packed;
> +
> +struct appletbdrm_frame {
> +	__le16 begin_x;
> +	__le16 begin_y;
> +	__le16 width;
> +	__le16 height;
> +	__le32 buf_size;
> +	u8 buf[];
> +} __packed;
> +
> +struct appletbdrm_fb_request_footer {
> +	u8 unk_00[12];
> +	__le32 unk_0c;
> +	u8 unk_10[12];
> +	__le32 unk_1c;
> +	__le64 timestamp;
> +	u8 unk_28[12];
> +	__le32 unk_34;
> +	u8 unk_38[20];
> +	__le32 unk_4c;
> +} __packed;
> +
> +struct appletbdrm_fb_request {
> +	struct appletbdrm_msg_request_header header;
> +	__le16 unk_10;
> +	u8 msg_id;
> +	u8 unk_13[29];
> +	/*
> +	 * Contents of `data`:
> +	 * - struct appletbdrm_frame frames[];
> +	 * - struct appletbdrm_fb_request_footer footer;
> +	 * - padding to make the total size a multiple of 16
> +	 */
> +	u8 data[];
> +} __packed;
> +
> +struct appletbdrm_fb_request_response {
> +	struct appletbdrm_msg_response_header header;
> +	u8 unk_14[12];
> +	__le64 timestamp;
> +} __packed;
> +
> +struct appletbdrm_device {
> +	struct device *dev;

This field should not be here. The Linux device is already available at 
drm.dev.

> +	struct device *dmadev;
> +
> +	unsigned int in_ep;
> +	unsigned int out_ep;
> +
> +	unsigned int width;
> +	unsigned int height;
> +
> +	struct drm_device drm;
> +	struct drm_display_mode mode;
> +	struct drm_connector connector;
> +	struct drm_plane primary_plane;
> +	struct drm_crtc crtc;
> +	struct drm_encoder encoder;
> +};
> +
> +struct appletbdrm_plane_state {
> +	struct drm_shadow_plane_state base;
> +	struct appletbdrm_fb_request *request;
> +	struct appletbdrm_fb_request_response *response;
> +	size_t request_size;
> +	size_t frames_size;
> +};
> +
> +static inline struct appletbdrm_plane_state *to_appletbdrm_plane_state(struct drm_plane_state *state)
> +{
> +	return container_of(state, struct appletbdrm_plane_state, base.base);
> +}
> +
> +static int appletbdrm_send_request(struct appletbdrm_device *adev,
> +				   struct appletbdrm_msg_request_header *request, size_t size)
> +{
> +	struct usb_device *udev = adev_to_udev(adev);
> +	struct drm_device *drm = &adev->drm;
> +	int ret, actual_size;
> +
> +	ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, adev->out_ep),
> +			   request, size, &actual_size, APPLETBDRM_BULK_MSG_TIMEOUT);
> +	if (ret) {
> +		drm_err(drm, "Failed to send message (%d)\n", ret);
> +		return ret;
> +	}
> +
> +	if (actual_size != size) {
> +		drm_err(drm, "Actual size (%d) doesn't match expected size (%lu)\n",
> +			actual_size, size);
> +		return -EIO;
> +	}
> +
> +	return ret;
> +}
> +
> +static int appletbdrm_read_response(struct appletbdrm_device *adev,
> +				    struct appletbdrm_msg_response_header *response,
> +				    size_t size, u32 expected_response)
> +{
> +	struct usb_device *udev = adev_to_udev(adev);
> +	struct drm_device *drm = &adev->drm;
> +	int ret, actual_size;
> +	bool readiness_signal_received = false;
> +
> +retry:
> +	ret = usb_bulk_msg(udev, usb_rcvbulkpipe(udev, adev->in_ep),
> +			   response, size, &actual_size, APPLETBDRM_BULK_MSG_TIMEOUT);
> +	if (ret) {
> +		drm_err(drm, "Failed to read response (%d)\n", ret);
> +		return ret;
> +	}
> +
> +	/*
> +	 * The device responds to the first request sent in a particular
> +	 * timeframe after the USB device configuration is set with a readiness
> +	 * signal, in which case the response should be read again
> +	 */
> +	if (response->msg == APPLETBDRM_MSG_SIGNAL_READINESS) {
> +		if (!readiness_signal_received) {
> +			readiness_signal_received = true;
> +			goto retry;
> +		}
> +
> +		drm_err(drm, "Encountered unexpected readiness signal\n");
> +		return -EIO;
> +	}
> +
> +	if (actual_size != size) {
> +		drm_err(drm, "Actual size (%d) doesn't match expected size (%lu)\n",
> +			actual_size, size);
> +		return -EIO;
> +	}
> +
> +	if (response->msg != expected_response) {
> +		drm_err(drm, "Unexpected response from device (expected %p4ch found %p4ch)\n",
> +			&expected_response, &response->msg);
> +		return -EIO;
> +	}
> +
> +	return 0;
> +}
> +
> +static int appletbdrm_send_msg(struct appletbdrm_device *adev, u32 msg)
> +{
> +	struct appletbdrm_msg_simple_request *request;
> +	int ret;
> +
> +	request = kzalloc(sizeof(*request), GFP_KERNEL);
> +	if (!request)
> +		return -ENOMEM;
> +
> +	request->header.unk_00 = cpu_to_le16(2);
> +	request->header.unk_02 = cpu_to_le16(0x1512);
> +	request->header.size = cpu_to_le32(sizeof(*request) - sizeof(request->header));
> +	request->msg = msg;
> +	request->size = request->header.size;
> +
> +	ret = appletbdrm_send_request(adev, &request->header, sizeof(*request));
> +
> +	kfree(request);
> +
> +	return ret;
> +}
> +
> +static int appletbdrm_clear_display(struct appletbdrm_device *adev)
> +{
> +	return appletbdrm_send_msg(adev, APPLETBDRM_MSG_CLEAR_DISPLAY);
> +}
> +
> +static int appletbdrm_signal_readiness(struct appletbdrm_device *adev)
> +{
> +	return appletbdrm_send_msg(adev, APPLETBDRM_MSG_SIGNAL_READINESS);
> +}
> +
> +static int appletbdrm_get_information(struct appletbdrm_device *adev)
> +{
> +	struct appletbdrm_msg_information *info;
> +	struct drm_device *drm = &adev->drm;
> +	u8 bits_per_pixel;
> +	u32 pixel_format;
> +	int ret;
> +
> +	info = kzalloc(sizeof(*info), GFP_KERNEL);
> +	if (!info)
> +		return -ENOMEM;
> +
> +	ret = appletbdrm_send_msg(adev, APPLETBDRM_MSG_GET_INFORMATION);
> +	if (ret)
> +		return ret;
> +
> +	ret = appletbdrm_read_response(adev, &info->header, sizeof(*info),
> +				       APPLETBDRM_MSG_GET_INFORMATION);
> +	if (ret)
> +		goto free_info;
> +
> +	bits_per_pixel = info->bits_per_pixel;
> +	pixel_format = get_unaligned(&info->pixel_format);
> +
> +	adev->width = get_unaligned_le32(&info->width);
> +	adev->height = get_unaligned_le32(&info->height);
> +
> +	if (bits_per_pixel != APPLETBDRM_BITS_PER_PIXEL) {
> +		drm_err(drm, "Encountered unexpected bits per pixel value (%d)\n", bits_per_pixel);
> +		ret = -EINVAL;
> +		goto free_info;
> +	}
> +
> +	if (pixel_format != APPLETBDRM_PIXEL_FORMAT) {
> +		drm_err(drm, "Encountered unknown pixel format (%p4ch)\n", &pixel_format);
> +		ret = -EINVAL;
> +		goto free_info;
> +	}
> +
> +free_info:
> +	kfree(info);
> +
> +	return ret;
> +}
> +
> +static u32 rect_size(struct drm_rect *rect)
> +{
> +	return drm_rect_width(rect) * drm_rect_height(rect) * (APPLETBDRM_BITS_PER_PIXEL / 8);
> +}
> +
> +static int appletbdrm_connector_helper_get_modes(struct drm_connector *connector)
> +{
> +	struct appletbdrm_device *adev = drm_to_adev(connector->dev);
> +
> +	return drm_connector_helper_get_modes_fixed(connector, &adev->mode);
> +}
> +
> +static const u32 appletbdrm_primary_plane_formats[] = {
> +	DRM_FORMAT_BGR888,
> +	DRM_FORMAT_XRGB8888, /* emulated */
> +};
> +
> +static int appletbdrm_primary_plane_helper_atomic_check(struct drm_plane *plane,
> +						   struct drm_atomic_state *state)
> +{
> +	struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, plane);
> +	struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane);
> +	struct drm_crtc *new_crtc = new_plane_state->crtc;
> +	struct drm_crtc_state *new_crtc_state = NULL;
> +	struct appletbdrm_plane_state *appletbdrm_state = to_appletbdrm_plane_state(new_plane_state);
> +	struct drm_atomic_helper_damage_iter iter;
> +	struct drm_rect damage;
> +	size_t frames_size = 0;
> +	size_t request_size;
> +	int ret;
> +
> +	if (new_crtc)
> +		new_crtc_state = drm_atomic_get_new_crtc_state(state, new_crtc);
> +
> +	ret = drm_atomic_helper_check_plane_state(new_plane_state, new_crtc_state,
> +						  DRM_PLANE_NO_SCALING,
> +						  DRM_PLANE_NO_SCALING,
> +						  false, false);
> +	if (ret)
> +		return ret;
> +	else if (!new_plane_state->visible)
> +		return 0;
> +
> +	drm_atomic_helper_damage_iter_init(&iter, old_plane_state, new_plane_state);
> +	drm_atomic_for_each_plane_damage(&iter, &damage) {
> +		frames_size += struct_size((struct appletbdrm_frame *)0, buf, rect_size(&damage));
> +	}
> +
> +	if (!frames_size)
> +		return 0;
> +
> +	request_size = ALIGN(sizeof(struct appletbdrm_fb_request) +
> +		       frames_size +
> +		       sizeof(struct appletbdrm_fb_request_footer), 16);
> +
> +	appletbdrm_state->request = kzalloc(request_size, GFP_KERNEL);
> +
> +	if (!appletbdrm_state->request)
> +		return -ENOMEM;
> +
> +	appletbdrm_state->response = kzalloc(sizeof(*appletbdrm_state->response), GFP_KERNEL);
> +
> +	if (!appletbdrm_state->response)
> +		return -ENOMEM;
> +
> +	appletbdrm_state->request_size = request_size;
> +	appletbdrm_state->frames_size = frames_size;

AFAIU you're preallocating the memory for the drawing commands. Makes 
sense to me.

> +
> +	return 0;
> +}
> +
> +static int appletbdrm_flush_damage(struct appletbdrm_device *adev,
> +				   struct drm_plane_state *old_state,
> +				   struct drm_plane_state *state)
> +{
> +	struct appletbdrm_plane_state *appletbdrm_state = to_appletbdrm_plane_state(state);
> +	struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(state);
> +	struct appletbdrm_fb_request_response *response = appletbdrm_state->response;
> +	struct appletbdrm_fb_request_footer *footer;
> +	struct drm_atomic_helper_damage_iter iter;
> +	struct drm_framebuffer *fb = state->fb;
> +	struct appletbdrm_fb_request *request = appletbdrm_state->request;
> +	struct drm_device *drm = &adev->drm;
> +	struct appletbdrm_frame *frame;
> +	u64 timestamp = ktime_get_ns();
> +	struct drm_rect damage;
> +	size_t frames_size = appletbdrm_state->frames_size;
> +	size_t request_size = appletbdrm_state->request_size;
> +	int ret;
> +
> +	if (!frames_size)
> +		return 0;
> +
> +	ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
> +	if (ret) {
> +		drm_err(drm, "Failed to start CPU framebuffer access (%d)\n", ret);
> +		goto end_fb_cpu_access;
> +	}
> +
> +	request->header.unk_00 = cpu_to_le16(2);
> +	request->header.unk_02 = cpu_to_le16(0x12);
> +	request->header.unk_04 = cpu_to_le32(9);
> +	request->header.size = cpu_to_le32(request_size - sizeof(request->header));
> +	request->unk_10 = cpu_to_le16(1);
> +	request->msg_id = timestamp & 0xff;
> +
> +	frame = (struct appletbdrm_frame *)request->data;
> +
> +	drm_atomic_helper_damage_iter_init(&iter, old_state, state);
> +	drm_atomic_for_each_plane_damage(&iter, &damage) {
> +		struct drm_rect dst_clip = state->dst;
> +		struct iosys_map dst = IOSYS_MAP_INIT_VADDR(frame->buf);
> +		u32 buf_size = rect_size(&damage);
> +
> +		if (!drm_rect_intersect(&dst_clip, &damage))
> +			continue;
> +
> +		/*
> +		 * The coordinates need to be translated to the coordinate
> +		 * system the device expects, see the comment in
> +		 * appletbdrm_setup_mode_config
> +		 */
> +		frame->begin_x = cpu_to_le16(damage.y1);
> +		frame->begin_y = cpu_to_le16(adev->height - damage.x2);
> +		frame->width = cpu_to_le16(drm_rect_height(&damage));
> +		frame->height = cpu_to_le16(drm_rect_width(&damage));
> +		frame->buf_size = cpu_to_le32(buf_size);
> +
> +		switch (fb->format->format) {
> +		case DRM_FORMAT_XRGB8888:
> +			drm_fb_xrgb8888_to_bgr888(&dst, NULL, &shadow_plane_state->data[0], fb, &damage, &shadow_plane_state->fmtcnv_state);
> +			break;
> +		default:
> +			drm_fb_memcpy(&dst, NULL, &shadow_plane_state->data[0], fb, &damage);
> +			break;
> +		}
> +
> +		frame = (void *)frame + struct_size(frame, buf, buf_size);
> +	}
> +
> +	footer = (struct appletbdrm_fb_request_footer *)&request->data[frames_size];
> +
> +	footer->unk_0c = cpu_to_le32(0xfffe);
> +	footer->unk_1c = cpu_to_le32(0x80001);
> +	footer->unk_34 = cpu_to_le32(0x80002);
> +	footer->unk_4c = cpu_to_le32(0xffff);
> +	footer->timestamp = cpu_to_le64(timestamp);

And here you're building the drawing commands from the allocated frame 
memory. Also makes sense.

> +
> +	ret = appletbdrm_send_request(adev, &request->header, request_size);
> +	if (ret)
> +		goto end_fb_cpu_access;
> +
> +	ret = appletbdrm_read_response(adev, &response->header, sizeof(*response),
> +				       APPLETBDRM_MSG_UPDATE_COMPLETE);
> +	if (ret)
> +		goto end_fb_cpu_access;
> +
> +	if (response->timestamp != footer->timestamp) {
> +		drm_err(drm, "Response timestamp (%llu) doesn't match request timestamp (%llu)\n",
> +			le64_to_cpu(response->timestamp), timestamp);
> +		goto end_fb_cpu_access;
> +	}
> +
> +end_fb_cpu_access:
> +	drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
> +
> +	return ret;
> +}
> +
> +static void appletbdrm_primary_plane_helper_atomic_update(struct drm_plane *plane,
> +						     struct drm_atomic_state *old_state)
> +{
> +	struct appletbdrm_device *adev = drm_to_adev(plane->dev);
> +	struct drm_device *drm = plane->dev;
> +	struct drm_plane_state *plane_state = plane->state;
> +	struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(old_state, plane);
> +	int idx;
> +
> +	if (!drm_dev_enter(drm, &idx))
> +		return;
> +
> +	appletbdrm_flush_damage(adev, old_plane_state, plane_state);
> +
> +	drm_dev_exit(idx);
> +}
> +
> +static void appletbdrm_primary_plane_helper_atomic_disable(struct drm_plane *plane,
> +							   struct drm_atomic_state *state)
> +{
> +	struct drm_device *dev = plane->dev;
> +	struct appletbdrm_device *adev = drm_to_adev(dev);
> +	int idx;
> +
> +	if (!drm_dev_enter(dev, &idx))
> +		return;
> +
> +	appletbdrm_clear_display(adev);
> +
> +	drm_dev_exit(idx);
> +}
> +
> +static void appletbdrm_primary_plane_reset(struct drm_plane *plane)
> +{
> +	struct appletbdrm_plane_state *appletbdrm_state;
> +
> +	WARN_ON(plane->state);
> +
> +	appletbdrm_state = kzalloc(sizeof(*appletbdrm_state), GFP_KERNEL);
> +	if (!appletbdrm_state)
> +		return;
> +
> +	__drm_gem_reset_shadow_plane(plane, &appletbdrm_state->base);
> +}
> +
> +static struct drm_plane_state *appletbdrm_primary_plane_duplicate_state(struct drm_plane *plane)
> +{
> +	struct drm_shadow_plane_state *new_shadow_plane_state;
> +	struct appletbdrm_plane_state *old_appletbdrm_state;
> +	struct appletbdrm_plane_state *appletbdrm_state;
> +
> +	if (WARN_ON(!plane->state))
> +		return NULL;
> +
> +	old_appletbdrm_state = to_appletbdrm_plane_state(plane->state);
> +	appletbdrm_state = kmemdup(old_appletbdrm_state, sizeof(*appletbdrm_state), GFP_KERNEL);
> +	if (!appletbdrm_state)
> +		return NULL;
> +
> +	/* Request and response are not duplicated and are allocated in .atomic_check */
> +	appletbdrm_state->request = NULL;
> +	appletbdrm_state->response = NULL;

You also have to clear the frame and request size, I think.

Duplicated state will be processed by the atomic_check before being 
used. So you'll have a chance of recomputing these temporary buffers.

Simply allocate with kzalloc instead of kmemdup() and you'll be fine.

> +
> +	new_shadow_plane_state = &appletbdrm_state->base;
> +
> +	__drm_gem_duplicate_shadow_plane_state(plane, new_shadow_plane_state);

This call is important to do.

> +
> +	return &new_shadow_plane_state->base;
> +}
> +
> +static void appletbdrm_primary_plane_destroy_state(struct drm_plane *plane,
> +						   struct drm_plane_state *state)
> +{
> +	struct appletbdrm_plane_state *appletbdrm_state = to_appletbdrm_plane_state(state);
> +
> +	kfree(appletbdrm_state->request);
> +	kfree(appletbdrm_state->response);
> +
> +	__drm_gem_destroy_shadow_plane_state(&appletbdrm_state->base);
> +
> +	kfree(appletbdrm_state);
> +}
> +
> +static const struct drm_plane_helper_funcs appletbdrm_primary_plane_helper_funcs = {
> +	DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
> +	.atomic_check = appletbdrm_primary_plane_helper_atomic_check,
> +	.atomic_update = appletbdrm_primary_plane_helper_atomic_update,
> +	.atomic_disable = appletbdrm_primary_plane_helper_atomic_disable,
> +};
> +
> +static const struct drm_plane_funcs appletbdrm_primary_plane_funcs = {
> +	.update_plane = drm_atomic_helper_update_plane,
> +	.disable_plane = drm_atomic_helper_disable_plane,
> +	.reset = appletbdrm_primary_plane_reset,
> +	.atomic_duplicate_state = appletbdrm_primary_plane_duplicate_state,
> +	.atomic_destroy_state = appletbdrm_primary_plane_destroy_state,
> +	.destroy = drm_plane_cleanup,
> +};
> +
> +static enum drm_mode_status appletbdrm_crtc_helper_mode_valid(struct drm_crtc *crtc,
> +							  const struct drm_display_mode *mode)
> +{
> +	struct appletbdrm_device *adev = drm_to_adev(crtc->dev);
> +
> +	return drm_crtc_helper_mode_valid_fixed(crtc, mode, &adev->mode);
> +}
> +
> +static const struct drm_mode_config_funcs appletbdrm_mode_config_funcs = {
> +	.fb_create = drm_gem_fb_create_with_dirty,
> +	.atomic_check = drm_atomic_helper_check,
> +	.atomic_commit = drm_atomic_helper_commit,
> +};
> +
> +static const struct drm_connector_funcs appletbdrm_connector_funcs = {
> +	.reset = drm_atomic_helper_connector_reset,
> +	.destroy = drm_connector_cleanup,
> +	.fill_modes = drm_helper_probe_single_connector_modes,
> +	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> +	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> +};
> +
> +static const struct drm_connector_helper_funcs appletbdrm_connector_helper_funcs = {
> +	.get_modes = appletbdrm_connector_helper_get_modes,
> +};
> +
> +static const struct drm_crtc_helper_funcs appletbdrm_crtc_helper_funcs = {
> +	.mode_valid = appletbdrm_crtc_helper_mode_valid,
> +};
> +
> +static const struct drm_crtc_funcs appletbdrm_crtc_funcs = {
> +	.reset = drm_atomic_helper_crtc_reset,
> +	.destroy = drm_crtc_cleanup,
> +	.set_config = drm_atomic_helper_set_config,
> +	.page_flip = drm_atomic_helper_page_flip,
> +	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
> +	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
> +};
> +
> +static const struct drm_encoder_funcs appletbdrm_encoder_funcs = {
> +	.destroy = drm_encoder_cleanup,
> +};
> +
> +static struct drm_gem_object *appletbdrm_driver_gem_prime_import(struct drm_device *dev,
> +								 struct dma_buf *dma_buf)
> +{
> +	struct appletbdrm_device *adev = drm_to_adev(dev);
> +
> +	if (!adev->dmadev)
> +		return ERR_PTR(-ENODEV);
> +
> +	return drm_gem_prime_import_dev(dev, dma_buf, adev->dmadev);
> +}
> +
> +DEFINE_DRM_GEM_FOPS(appletbdrm_drm_fops);
> +
> +static const struct drm_driver appletbdrm_drm_driver = {
> +	DRM_GEM_SHMEM_DRIVER_OPS,
> +	.gem_prime_import	= appletbdrm_driver_gem_prime_import,
> +	.name			= "appletbdrm",
> +	.desc			= "Apple Touch Bar DRM Driver",
> +	.major			= 1,
> +	.minor			= 0,
> +	.driver_features	= DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
> +	.fops			= &appletbdrm_drm_fops,
> +};
> +
> +static int appletbdrm_setup_mode_config(struct appletbdrm_device *adev)
> +{
> +	struct drm_connector *connector = &adev->connector;
> +	struct drm_plane *primary_plane;
> +	struct drm_crtc *crtc;
> +	struct drm_encoder *encoder;
> +	struct drm_device *drm = &adev->drm;
> +	struct device *dev = adev->dev;
> +	int ret;
> +
> +	ret = drmm_mode_config_init(drm);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to initialize mode configuration\n");

Use drm_err() here. It does the right thing. We don't have a 
drm_dev_probe() yet, but you're discouraged from useing the dev_() print 
helpers.

Same below.

> +
> +	primary_plane = &adev->primary_plane;
> +	ret = drm_universal_plane_init(drm, primary_plane, 0,
> +				       &appletbdrm_primary_plane_funcs,
> +				       appletbdrm_primary_plane_formats,
> +				       ARRAY_SIZE(appletbdrm_primary_plane_formats),
> +				       NULL,
> +				       DRM_PLANE_TYPE_PRIMARY, NULL);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to initialize universal plane object\n");
> +	drm_plane_helper_add(primary_plane, &appletbdrm_primary_plane_helper_funcs);
> +	drm_plane_enable_fb_damage_clips(primary_plane);
> +
> +	crtc = &adev->crtc;
> +	ret = drm_crtc_init_with_planes(drm, crtc, primary_plane, NULL,
> +					&appletbdrm_crtc_funcs, NULL);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to initialize CRTC object\n");
> +	drm_crtc_helper_add(crtc, &appletbdrm_crtc_helper_funcs);
> +
> +	encoder = &adev->encoder;
> +	ret = drm_encoder_init(drm, encoder, &appletbdrm_encoder_funcs,
> +			       DRM_MODE_ENCODER_DAC, NULL);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to initialize encoder\n");
> +	encoder->possible_crtcs = drm_crtc_mask(crtc);
> +
> +	/*
> +	 * The coordinate system used by the device is different from the
> +	 * coordinate system of the framebuffer in that the x and y axes are
> +	 * swapped, and that the y axis is inverted; so what the device reports
> +	 * as the height is actually the width of the framebuffer and vice
> +	 * versa
> +	 */
> +	drm->mode_config.min_width = 0;
> +	drm->mode_config.min_height = 0;

No need to clear this to zero.

> +	drm->mode_config.max_width = max(adev->height, DRM_SHADOW_PLANE_MAX_WIDTH);
> +	drm->mode_config.max_height = max(adev->width, DRM_SHADOW_PLANE_MAX_HEIGHT);
> +	drm->mode_config.preferred_depth = APPLETBDRM_BITS_PER_PIXEL;
> +	drm->mode_config.funcs = &appletbdrm_mode_config_funcs;
> +
> +	adev->mode = (struct drm_display_mode) {
> +		DRM_MODE_INIT(60, adev->height, adev->width,
> +			      DRM_MODE_RES_MM(adev->height, 218),
> +			      DRM_MODE_RES_MM(adev->width, 218))
> +	};
> +
> +	ret = drm_connector_init(drm, connector,
> +				 &appletbdrm_connector_funcs, DRM_MODE_CONNECTOR_USB);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to initialize connector\n");
> +
> +	drm_connector_helper_add(connector, &appletbdrm_connector_helper_funcs);
> +
> +	ret = drm_connector_set_panel_orientation(connector,
> +						  DRM_MODE_PANEL_ORIENTATION_RIGHT_UP);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to set panel orientation\n");
> +
> +	connector->display_info.non_desktop = true;
> +	ret = drm_object_property_set_value(&connector->base,
> +					    drm->mode_config.non_desktop_property, true);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to set non-desktop property\n");
> +
> +	ret = drm_connector_attach_encoder(connector, encoder);
> +
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to initialize simple display pipe\n");
> +
> +	drm_mode_config_reset(drm);
> +
> +	return 0;
> +}
> +
> +static int appletbdrm_probe(struct usb_interface *intf,
> +			    const struct usb_device_id *id)
> +{
> +	struct usb_endpoint_descriptor *bulk_in, *bulk_out;
> +	struct device *dev = &intf->dev;
> +	struct appletbdrm_device *adev;
> +	struct drm_device *drm;
> +	int ret;
> +
> +	ret = usb_find_common_endpoints(intf->cur_altsetting, &bulk_in, &bulk_out, NULL, NULL);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to find bulk endpoints\n");
> +
> +	adev = devm_drm_dev_alloc(dev, &appletbdrm_drm_driver, struct appletbdrm_device, drm);
> +	if (IS_ERR(adev))
> +		return PTR_ERR(adev);
> +
> +	adev->dev = dev;
> +	adev->in_ep = bulk_in->bEndpointAddress;
> +	adev->out_ep = bulk_out->bEndpointAddress;
> +
> +	drm = &adev->drm;
> +
> +	usb_set_intfdata(intf, adev);
> +
> +	ret = appletbdrm_get_information(adev);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to get display information\n");
> +
> +	ret = appletbdrm_signal_readiness(adev);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to signal readiness\n");
> +
> +	ret = appletbdrm_setup_mode_config(adev);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to setup mode config\n");
> +
> +	ret = drm_dev_register(drm, 0);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to register DRM device\n");
> +
> +	ret = appletbdrm_clear_display(adev);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to clear display\n");
> +
> +	return 0;
> +}
> +
> +static void appletbdrm_disconnect(struct usb_interface *intf)
> +{
> +	struct appletbdrm_device *adev = usb_get_intfdata(intf);
> +	struct drm_device *drm = &adev->drm;
> +

You have to put_device(dmadev) to release the DMA device.

Best regards
Thomas

> +	drm_dev_unplug(drm);
> +	drm_atomic_helper_shutdown(drm);
> +}
> +
> +static void appletbdrm_shutdown(struct usb_interface *intf)
> +{
> +	struct appletbdrm_device *adev = usb_get_intfdata(intf);
> +
> +	/*
> +	 * The framebuffer needs to be cleared on shutdown since its content
> +	 * persists across boots
> +	 */
> +	drm_atomic_helper_shutdown(&adev->drm);
> +}
> +
> +static const struct usb_device_id appletbdrm_usb_id_table[] = {
> +	{ USB_DEVICE_INTERFACE_CLASS(0x05ac, 0x8302, USB_CLASS_AUDIO_VIDEO) },
> +	{}
> +};
> +MODULE_DEVICE_TABLE(usb, appletbdrm_usb_id_table);
> +
> +static struct usb_driver appletbdrm_usb_driver = {
> +	.name		= "appletbdrm",
> +	.probe		= appletbdrm_probe,
> +	.disconnect	= appletbdrm_disconnect,
> +	.shutdown	= appletbdrm_shutdown,
> +	.id_table	= appletbdrm_usb_id_table,
> +};
> +module_usb_driver(appletbdrm_usb_driver);
> +
> +MODULE_AUTHOR("Kerem Karabay <kekrby@gmail.com>");
> +MODULE_DESCRIPTION("Apple Touch Bar DRM Driver");
> +MODULE_LICENSE("GPL");

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)

Re: [PATCH v3 3/3] drm/tiny: add driver for Apple Touch Bars in x86 Macs

[Aditya Garg]

Hi

> On 24 Feb 2025, at 2:40 PM, Thomas Zimmermann <tzimmermann@suse.de> wrote:
> 
> Hi
> 
>> Am 21.02.25 um 12:37 schrieb Aditya Garg:
>> From: Kerem Karabay <kekrby@gmail.com>
>> 
>> The Touch Bars found on x86 Macs support two USB configurations: one
>> where the device presents itself as a HID keyboard and can display
>> predefined sets of keys, and one where the operating system has full
>> control over what is displayed.
>> 
>> This commit adds support for the display functionality of the second
>> configuration. Functionality for the first configuration has been
>> merged in the HID tree.
>> 
>> Note that this driver has only been tested on T2 Macs, and only includes
>> the USB device ID for these devices. Testing on T1 Macs would be
>> appreciated.
>> 
>> Credit goes to Ben (Bingxing) Wang on GitHub [1] for reverse engineering
>> most of the protocol.
>> 
>> [1]: https://github.com/imbushuo/DFRDisplayKm
>> 
>> Signed-off-by: Kerem Karabay <kekrby@gmail.com>
>> Co-developed-by: Atharva Tiwari <evepolonium@gmail.com>
>> Signed-off-by: Atharva Tiwari <evepolonium@gmail.com>
>> Co-developed-by: Aditya Garg <gargaditya08@live.com>
>> Signed-off-by: Aditya Garg <gargaditya08@live.com>
>> Signed-off-by: Aun-Ali Zaidi <admin@kodeit.net>
>> ---
>> v2 ->
>> - Add the driver to MAINTAINERS.
>> - Allocate memory for request and response in plane's atomic-check helper
>> - Void the use of drm_fb_blit()
>> - Implement atomic_disable
>> - Make PRIME work
>> - Remove the date field from struct drm_driver
>> - intersect damage with dst_clip
>> - Register DRM device in appletbdrm_probe
>> - Clear the display as the final call in probe
>> - Select hid_multitouch as well in kconfig
>> 
>> v3 ->
>> - Change commit message to credit Ben (Bingxing) Wang
>>  MAINTAINERS                       |   7 +
>>  drivers/gpu/drm/tiny/Kconfig      |  14 +
>>  drivers/gpu/drm/tiny/Makefile     |   1 +
>>  drivers/gpu/drm/tiny/appletbdrm.c | 806 ++++++++++++++++++++++++++++++
>>  4 files changed, 828 insertions(+)
>>  create mode 100644 drivers/gpu/drm/tiny/appletbdrm.c
>> 
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index efee40ea5..43fafaab3 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -7148,6 +7148,13 @@ S:    Supported
>>  T:    git https://gitlab.freedesktop.org/drm/misc/kernel.git
>>  F:    drivers/gpu/drm/sun4i/sun8i*
>>  +DRM DRIVER FOR APPLE TOUCH BARS
>> +M:    Aun-Ali Zaidi <admin@kodeit.net>
> 
> You cannot put someone else here. Who is that?

Aun-Ali Zaidi and I both a part of t2linux.org. He volunteered to be a maintainer on my request. If you want I can add myself as a co maintainer. You want that?
> 
>> +L:    dri-devel@lists.freedesktop.org
>> +S:    Maintained
>> +T:    git https://gitlab.freedesktop.org/drm/misc/kernel.git
>> +F:    drivers/gpu/drm/tiny/appletbdrm.c
>> +
>>  DRM DRIVER FOR ARM PL111 CLCD
>>  M:    Linus Walleij <linus.walleij@linaro.org>
>>  S:    Maintained
>> diff --git a/drivers/gpu/drm/tiny/Kconfig b/drivers/gpu/drm/tiny/Kconfig
>> index 94cbdb133..25471791c 100644
>> --- a/drivers/gpu/drm/tiny/Kconfig
>> +++ b/drivers/gpu/drm/tiny/Kconfig
>> @@ -1,5 +1,19 @@
>>  # SPDX-License-Identifier: GPL-2.0-only
>>  +config DRM_APPLETBDRM
>> +    tristate "DRM support for Apple Touch Bars"
>> +    depends on DRM && USB && MMU
>> +    select DRM_GEM_SHMEM_HELPER
>> +    select DRM_KMS_HELPER
>> +    select HID_APPLETB_BL
>> +    select HID_MULTITOUCH
>> +    help
>> +      Say Y here if you want support for the display of Touch Bars on x86
>> +      MacBook Pros.
>> +
>> +      To compile this driver as a module, choose M here: the
>> +      module will be called appletbdrm.
>> +
>>  config DRM_ARCPGU
>>      tristate "ARC PGU"
>>      depends on DRM && OF
>> diff --git a/drivers/gpu/drm/tiny/Makefile b/drivers/gpu/drm/tiny/Makefile
>> index 60816d2eb..0a3a7837a 100644
>> --- a/drivers/gpu/drm/tiny/Makefile
>> +++ b/drivers/gpu/drm/tiny/Makefile
>> @@ -1,5 +1,6 @@
>>  # SPDX-License-Identifier: GPL-2.0-only
>>  +obj-$(CONFIG_DRM_APPLETBDRM)        += appletbdrm.o
>>  obj-$(CONFIG_DRM_ARCPGU)        += arcpgu.o
>>  obj-$(CONFIG_DRM_BOCHS)            += bochs.o
>>  obj-$(CONFIG_DRM_CIRRUS_QEMU)        += cirrus-qemu.o
>> diff --git a/drivers/gpu/drm/tiny/appletbdrm.c b/drivers/gpu/drm/tiny/appletbdrm.c
> 
> Putting this driver into tiny is ok. It's the preferred place for single-file DRM drivers like this one.
> 
>> new file mode 100644
>> index 000000000..a17a3ecc3
>> --- /dev/null
>> +++ b/drivers/gpu/drm/tiny/appletbdrm.c
>> @@ -0,0 +1,806 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Apple Touch Bar DRM Driver
>> + *
>> + * Copyright (c) 2023 Kerem Karabay <kekrby@gmail.com>
>> + */
>> +
>> +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
>> +
>> +#include <linux/module.h>
>> +#include <linux/unaligned.h>
>> +#include <linux/usb.h>
>> +
>> +#include <drm/drm_atomic.h>
>> +#include <drm/drm_atomic_helper.h>
>> +#include <drm/drm_crtc.h>
>> +#include <drm/drm_damage_helper.h>
>> +#include <drm/drm_drv.h>
>> +#include <drm/drm_encoder.h>
>> +#include <drm/drm_format_helper.h>
>> +#include <drm/drm_fourcc.h>
>> +#include <drm/drm_framebuffer.h>
>> +#include <drm/drm_gem_atomic_helper.h>
>> +#include <drm/drm_gem_framebuffer_helper.h>
>> +#include <drm/drm_gem_shmem_helper.h>
>> +#include <drm/drm_plane.h>
>> +#include <drm/drm_probe_helper.h>
>> +
>> +#define __APPLETBDRM_MSG_STR4(str4)    ((__le32 __force)((str4[0] << 24) | (str4[1] << 16) | (str4[2] << 8) | str4[3]))
>> +#define __APPLETBDRM_MSG_TOK4(tok4)    __APPLETBDRM_MSG_STR4(#tok4)
>> +
>> +#define APPLETBDRM_PIXEL_FORMAT        __APPLETBDRM_MSG_TOK4(RGBA) /* The actual format is BGR888 */
>> +#define APPLETBDRM_BITS_PER_PIXEL    24
>> +
>> +#define APPLETBDRM_MSG_CLEAR_DISPLAY    __APPLETBDRM_MSG_TOK4(CLRD)
>> +#define APPLETBDRM_MSG_GET_INFORMATION    __APPLETBDRM_MSG_TOK4(GINF)
>> +#define APPLETBDRM_MSG_UPDATE_COMPLETE    __APPLETBDRM_MSG_TOK4(UDCL)
>> +#define APPLETBDRM_MSG_SIGNAL_READINESS    __APPLETBDRM_MSG_TOK4(REDY)
>> +
>> +#define APPLETBDRM_BULK_MSG_TIMEOUT    1000
>> +
>> +#define drm_to_adev(_drm)        container_of(_drm, struct appletbdrm_device, drm)
>> +#define adev_to_udev(adev)        interface_to_usbdev(to_usb_interface(adev->dev))
>> +
>> +struct appletbdrm_msg_request_header {
>> +    __le16 unk_00;
>> +    __le16 unk_02;
>> +    __le32 unk_04;
>> +    __le32 unk_08;
>> +    __le32 size;
>> +} __packed;
>> +
>> +struct appletbdrm_msg_response_header {
>> +    u8 unk_00[16];
>> +    __le32 msg;
>> +} __packed;
>> +
>> +struct appletbdrm_msg_simple_request {
>> +    struct appletbdrm_msg_request_header header;
>> +    __le32 msg;
>> +    u8 unk_14[8];
>> +    __le32 size;
>> +} __packed;
>> +
>> +struct appletbdrm_msg_information {
>> +    struct appletbdrm_msg_response_header header;
>> +    u8 unk_14[12];
>> +    __le32 width;
>> +    __le32 height;
>> +    u8 bits_per_pixel;
>> +    __le32 bytes_per_row;
>> +    __le32 orientation;
>> +    __le32 bitmap_info;
>> +    __le32 pixel_format;
>> +    __le32 width_inches;    /* floating point */
>> +    __le32 height_inches;    /* floating point */
>> +} __packed;
>> +
>> +struct appletbdrm_frame {
>> +    __le16 begin_x;
>> +    __le16 begin_y;
>> +    __le16 width;
>> +    __le16 height;
>> +    __le32 buf_size;
>> +    u8 buf[];
>> +} __packed;
>> +
>> +struct appletbdrm_fb_request_footer {
>> +    u8 unk_00[12];
>> +    __le32 unk_0c;
>> +    u8 unk_10[12];
>> +    __le32 unk_1c;
>> +    __le64 timestamp;
>> +    u8 unk_28[12];
>> +    __le32 unk_34;
>> +    u8 unk_38[20];
>> +    __le32 unk_4c;
>> +} __packed;
>> +
>> +struct appletbdrm_fb_request {
>> +    struct appletbdrm_msg_request_header header;
>> +    __le16 unk_10;
>> +    u8 msg_id;
>> +    u8 unk_13[29];
>> +    /*
>> +     * Contents of `data`:
>> +     * - struct appletbdrm_frame frames[];
>> +     * - struct appletbdrm_fb_request_footer footer;
>> +     * - padding to make the total size a multiple of 16
>> +     */
>> +    u8 data[];
>> +} __packed;
>> +
>> +struct appletbdrm_fb_request_response {
>> +    struct appletbdrm_msg_response_header header;
>> +    u8 unk_14[12];
>> +    __le64 timestamp;
>> +} __packed;
>> +
>> +struct appletbdrm_device {
>> +    struct device *dev;
> 
> This field should not be here. The Linux device is already available at drm.dev.
> 
>> +    struct device *dmadev;
>> +
>> +    unsigned int in_ep;
>> +    unsigned int out_ep;
>> +
>> +    unsigned int width;
>> +    unsigned int height;
>> +
>> +    struct drm_device drm;
>> +    struct drm_display_mode mode;
>> +    struct drm_connector connector;
>> +    struct drm_plane primary_plane;
>> +    struct drm_crtc crtc;
>> +    struct drm_encoder encoder;
>> +};
>> +
>> +struct appletbdrm_plane_state {
>> +    struct drm_shadow_plane_state base;
>> +    struct appletbdrm_fb_request *request;
>> +    struct appletbdrm_fb_request_response *response;
>> +    size_t request_size;
>> +    size_t frames_size;
>> +};
>> +
>> +static inline struct appletbdrm_plane_state *to_appletbdrm_plane_state(struct drm_plane_state *state)
>> +{
>> +    return container_of(state, struct appletbdrm_plane_state, base.base);
>> +}
>> +
>> +static int appletbdrm_send_request(struct appletbdrm_device *adev,
>> +                   struct appletbdrm_msg_request_header *request, size_t size)
>> +{
>> +    struct usb_device *udev = adev_to_udev(adev);
>> +    struct drm_device *drm = &adev->drm;
>> +    int ret, actual_size;
>> +
>> +    ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, adev->out_ep),
>> +               request, size, &actual_size, APPLETBDRM_BULK_MSG_TIMEOUT);
>> +    if (ret) {
>> +        drm_err(drm, "Failed to send message (%d)\n", ret);
>> +        return ret;
>> +    }
>> +
>> +    if (actual_size != size) {
>> +        drm_err(drm, "Actual size (%d) doesn't match expected size (%lu)\n",
>> +            actual_size, size);
>> +        return -EIO;
>> +    }
>> +
>> +    return ret;
>> +}
>> +
>> +static int appletbdrm_read_response(struct appletbdrm_device *adev,
>> +                    struct appletbdrm_msg_response_header *response,
>> +                    size_t size, u32 expected_response)
>> +{
>> +    struct usb_device *udev = adev_to_udev(adev);
>> +    struct drm_device *drm = &adev->drm;
>> +    int ret, actual_size;
>> +    bool readiness_signal_received = false;
>> +
>> +retry:
>> +    ret = usb_bulk_msg(udev, usb_rcvbulkpipe(udev, adev->in_ep),
>> +               response, size, &actual_size, APPLETBDRM_BULK_MSG_TIMEOUT);
>> +    if (ret) {
>> +        drm_err(drm, "Failed to read response (%d)\n", ret);
>> +        return ret;
>> +    }
>> +
>> +    /*
>> +     * The device responds to the first request sent in a particular
>> +     * timeframe after the USB device configuration is set with a readiness
>> +     * signal, in which case the response should be read again
>> +     */
>> +    if (response->msg == APPLETBDRM_MSG_SIGNAL_READINESS) {
>> +        if (!readiness_signal_received) {
>> +            readiness_signal_received = true;
>> +            goto retry;
>> +        }
>> +
>> +        drm_err(drm, "Encountered unexpected readiness signal\n");
>> +        return -EIO;
>> +    }
>> +
>> +    if (actual_size != size) {
>> +        drm_err(drm, "Actual size (%d) doesn't match expected size (%lu)\n",
>> +            actual_size, size);
>> +        return -EIO;
>> +    }
>> +
>> +    if (response->msg != expected_response) {
>> +        drm_err(drm, "Unexpected response from device (expected %p4ch found %p4ch)\n",
>> +            &expected_response, &response->msg);
>> +        return -EIO;
>> +    }
>> +
>> +    return 0;
>> +}
>> +
>> +static int appletbdrm_send_msg(struct appletbdrm_device *adev, u32 msg)
>> +{
>> +    struct appletbdrm_msg_simple_request *request;
>> +    int ret;
>> +
>> +    request = kzalloc(sizeof(*request), GFP_KERNEL);
>> +    if (!request)
>> +        return -ENOMEM;
>> +
>> +    request->header.unk_00 = cpu_to_le16(2);
>> +    request->header.unk_02 = cpu_to_le16(0x1512);
>> +    request->header.size = cpu_to_le32(sizeof(*request) - sizeof(request->header));
>> +    request->msg = msg;
>> +    request->size = request->header.size;
>> +
>> +    ret = appletbdrm_send_request(adev, &request->header, sizeof(*request));
>> +
>> +    kfree(request);
>> +
>> +    return ret;
>> +}
>> +
>> +static int appletbdrm_clear_display(struct appletbdrm_device *adev)
>> +{
>> +    return appletbdrm_send_msg(adev, APPLETBDRM_MSG_CLEAR_DISPLAY);
>> +}
>> +
>> +static int appletbdrm_signal_readiness(struct appletbdrm_device *adev)
>> +{
>> +    return appletbdrm_send_msg(adev, APPLETBDRM_MSG_SIGNAL_READINESS);
>> +}
>> +
>> +static int appletbdrm_get_information(struct appletbdrm_device *adev)
>> +{
>> +    struct appletbdrm_msg_information *info;
>> +    struct drm_device *drm = &adev->drm;
>> +    u8 bits_per_pixel;
>> +    u32 pixel_format;
>> +    int ret;
>> +
>> +    info = kzalloc(sizeof(*info), GFP_KERNEL);
>> +    if (!info)
>> +        return -ENOMEM;
>> +
>> +    ret = appletbdrm_send_msg(adev, APPLETBDRM_MSG_GET_INFORMATION);
>> +    if (ret)
>> +        return ret;
>> +
>> +    ret = appletbdrm_read_response(adev, &info->header, sizeof(*info),
>> +                       APPLETBDRM_MSG_GET_INFORMATION);
>> +    if (ret)
>> +        goto free_info;
>> +
>> +    bits_per_pixel = info->bits_per_pixel;
>> +    pixel_format = get_unaligned(&info->pixel_format);
>> +
>> +    adev->width = get_unaligned_le32(&info->width);
>> +    adev->height = get_unaligned_le32(&info->height);
>> +
>> +    if (bits_per_pixel != APPLETBDRM_BITS_PER_PIXEL) {
>> +        drm_err(drm, "Encountered unexpected bits per pixel value (%d)\n", bits_per_pixel);
>> +        ret = -EINVAL;
>> +        goto free_info;
>> +    }
>> +
>> +    if (pixel_format != APPLETBDRM_PIXEL_FORMAT) {
>> +        drm_err(drm, "Encountered unknown pixel format (%p4ch)\n", &pixel_format);
>> +        ret = -EINVAL;
>> +        goto free_info;
>> +    }
>> +
>> +free_info:
>> +    kfree(info);
>> +
>> +    return ret;
>> +}
>> +
>> +static u32 rect_size(struct drm_rect *rect)
>> +{
>> +    return drm_rect_width(rect) * drm_rect_height(rect) * (APPLETBDRM_BITS_PER_PIXEL / 8);
>> +}
>> +
>> +static int appletbdrm_connector_helper_get_modes(struct drm_connector *connector)
>> +{
>> +    struct appletbdrm_device *adev = drm_to_adev(connector->dev);
>> +
>> +    return drm_connector_helper_get_modes_fixed(connector, &adev->mode);
>> +}
>> +
>> +static const u32 appletbdrm_primary_plane_formats[] = {
>> +    DRM_FORMAT_BGR888,
>> +    DRM_FORMAT_XRGB8888, /* emulated */
>> +};
>> +
>> +static int appletbdrm_primary_plane_helper_atomic_check(struct drm_plane *plane,
>> +                           struct drm_atomic_state *state)
>> +{
>> +    struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, plane);
>> +    struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane);
>> +    struct drm_crtc *new_crtc = new_plane_state->crtc;
>> +    struct drm_crtc_state *new_crtc_state = NULL;
>> +    struct appletbdrm_plane_state *appletbdrm_state = to_appletbdrm_plane_state(new_plane_state);
>> +    struct drm_atomic_helper_damage_iter iter;
>> +    struct drm_rect damage;
>> +    size_t frames_size = 0;
>> +    size_t request_size;
>> +    int ret;
>> +
>> +    if (new_crtc)
>> +        new_crtc_state = drm_atomic_get_new_crtc_state(state, new_crtc);
>> +
>> +    ret = drm_atomic_helper_check_plane_state(new_plane_state, new_crtc_state,
>> +                          DRM_PLANE_NO_SCALING,
>> +                          DRM_PLANE_NO_SCALING,
>> +                          false, false);
>> +    if (ret)
>> +        return ret;
>> +    else if (!new_plane_state->visible)
>> +        return 0;
>> +
>> +    drm_atomic_helper_damage_iter_init(&iter, old_plane_state, new_plane_state);
>> +    drm_atomic_for_each_plane_damage(&iter, &damage) {
>> +        frames_size += struct_size((struct appletbdrm_frame *)0, buf, rect_size(&damage));
>> +    }
>> +
>> +    if (!frames_size)
>> +        return 0;
>> +
>> +    request_size = ALIGN(sizeof(struct appletbdrm_fb_request) +
>> +               frames_size +
>> +               sizeof(struct appletbdrm_fb_request_footer), 16);
>> +
>> +    appletbdrm_state->request = kzalloc(request_size, GFP_KERNEL);
>> +
>> +    if (!appletbdrm_state->request)
>> +        return -ENOMEM;
>> +
>> +    appletbdrm_state->response = kzalloc(sizeof(*appletbdrm_state->response), GFP_KERNEL);
>> +
>> +    if (!appletbdrm_state->response)
>> +        return -ENOMEM;
>> +
>> +    appletbdrm_state->request_size = request_size;
>> +    appletbdrm_state->frames_size = frames_size;
> 
> AFAIU you're preallocating the memory for the drawing commands. Makes sense to me.
> 
>> +
>> +    return 0;
>> +}
>> +
>> +static int appletbdrm_flush_damage(struct appletbdrm_device *adev,
>> +                   struct drm_plane_state *old_state,
>> +                   struct drm_plane_state *state)
>> +{
>> +    struct appletbdrm_plane_state *appletbdrm_state = to_appletbdrm_plane_state(state);
>> +    struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(state);
>> +    struct appletbdrm_fb_request_response *response = appletbdrm_state->response;
>> +    struct appletbdrm_fb_request_footer *footer;
>> +    struct drm_atomic_helper_damage_iter iter;
>> +    struct drm_framebuffer *fb = state->fb;
>> +    struct appletbdrm_fb_request *request = appletbdrm_state->request;
>> +    struct drm_device *drm = &adev->drm;
>> +    struct appletbdrm_frame *frame;
>> +    u64 timestamp = ktime_get_ns();
>> +    struct drm_rect damage;
>> +    size_t frames_size = appletbdrm_state->frames_size;
>> +    size_t request_size = appletbdrm_state->request_size;
>> +    int ret;
>> +
>> +    if (!frames_size)
>> +        return 0;
>> +
>> +    ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
>> +    if (ret) {
>> +        drm_err(drm, "Failed to start CPU framebuffer access (%d)\n", ret);
>> +        goto end_fb_cpu_access;
>> +    }
>> +
>> +    request->header.unk_00 = cpu_to_le16(2);
>> +    request->header.unk_02 = cpu_to_le16(0x12);
>> +    request->header.unk_04 = cpu_to_le32(9);
>> +    request->header.size = cpu_to_le32(request_size - sizeof(request->header));
>> +    request->unk_10 = cpu_to_le16(1);
>> +    request->msg_id = timestamp & 0xff;
>> +
>> +    frame = (struct appletbdrm_frame *)request->data;
>> +
>> +    drm_atomic_helper_damage_iter_init(&iter, old_state, state);
>> +    drm_atomic_for_each_plane_damage(&iter, &damage) {
>> +        struct drm_rect dst_clip = state->dst;
>> +        struct iosys_map dst = IOSYS_MAP_INIT_VADDR(frame->buf);
>> +        u32 buf_size = rect_size(&damage);
>> +
>> +        if (!drm_rect_intersect(&dst_clip, &damage))
>> +            continue;
>> +
>> +        /*
>> +         * The coordinates need to be translated to the coordinate
>> +         * system the device expects, see the comment in
>> +         * appletbdrm_setup_mode_config
>> +         */
>> +        frame->begin_x = cpu_to_le16(damage.y1);
>> +        frame->begin_y = cpu_to_le16(adev->height - damage.x2);
>> +        frame->width = cpu_to_le16(drm_rect_height(&damage));
>> +        frame->height = cpu_to_le16(drm_rect_width(&damage));
>> +        frame->buf_size = cpu_to_le32(buf_size);
>> +
>> +        switch (fb->format->format) {
>> +        case DRM_FORMAT_XRGB8888:
>> +            drm_fb_xrgb8888_to_bgr888(&dst, NULL, &shadow_plane_state->data[0], fb, &damage, &shadow_plane_state->fmtcnv_state);
>> +            break;
>> +        default:
>> +            drm_fb_memcpy(&dst, NULL, &shadow_plane_state->data[0], fb, &damage);
>> +            break;
>> +        }
>> +
>> +        frame = (void *)frame + struct_size(frame, buf, buf_size);
>> +    }
>> +
>> +    footer = (struct appletbdrm_fb_request_footer *)&request->data[frames_size];
>> +
>> +    footer->unk_0c = cpu_to_le32(0xfffe);
>> +    footer->unk_1c = cpu_to_le32(0x80001);
>> +    footer->unk_34 = cpu_to_le32(0x80002);
>> +    footer->unk_4c = cpu_to_le32(0xffff);
>> +    footer->timestamp = cpu_to_le64(timestamp);
> 
> And here you're building the drawing commands from the allocated frame memory. Also makes sense.
> 
>> +
>> +    ret = appletbdrm_send_request(adev, &request->header, request_size);
>> +    if (ret)
>> +        goto end_fb_cpu_access;
>> +
>> +    ret = appletbdrm_read_response(adev, &response->header, sizeof(*response),
>> +                       APPLETBDRM_MSG_UPDATE_COMPLETE);
>> +    if (ret)
>> +        goto end_fb_cpu_access;
>> +
>> +    if (response->timestamp != footer->timestamp) {
>> +        drm_err(drm, "Response timestamp (%llu) doesn't match request timestamp (%llu)\n",
>> +            le64_to_cpu(response->timestamp), timestamp);
>> +        goto end_fb_cpu_access;
>> +    }
>> +
>> +end_fb_cpu_access:
>> +    drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
>> +
>> +    return ret;
>> +}
>> +
>> +static void appletbdrm_primary_plane_helper_atomic_update(struct drm_plane *plane,
>> +                             struct drm_atomic_state *old_state)
>> +{
>> +    struct appletbdrm_device *adev = drm_to_adev(plane->dev);
>> +    struct drm_device *drm = plane->dev;
>> +    struct drm_plane_state *plane_state = plane->state;
>> +    struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(old_state, plane);
>> +    int idx;
>> +
>> +    if (!drm_dev_enter(drm, &idx))
>> +        return;
>> +
>> +    appletbdrm_flush_damage(adev, old_plane_state, plane_state);
>> +
>> +    drm_dev_exit(idx);
>> +}
>> +
>> +static void appletbdrm_primary_plane_helper_atomic_disable(struct drm_plane *plane,
>> +                               struct drm_atomic_state *state)
>> +{
>> +    struct drm_device *dev = plane->dev;
>> +    struct appletbdrm_device *adev = drm_to_adev(dev);
>> +    int idx;
>> +
>> +    if (!drm_dev_enter(dev, &idx))
>> +        return;
>> +
>> +    appletbdrm_clear_display(adev);
>> +
>> +    drm_dev_exit(idx);
>> +}
>> +
>> +static void appletbdrm_primary_plane_reset(struct drm_plane *plane)
>> +{
>> +    struct appletbdrm_plane_state *appletbdrm_state;
>> +
>> +    WARN_ON(plane->state);
>> +
>> +    appletbdrm_state = kzalloc(sizeof(*appletbdrm_state), GFP_KERNEL);
>> +    if (!appletbdrm_state)
>> +        return;
>> +
>> +    __drm_gem_reset_shadow_plane(plane, &appletbdrm_state->base);
>> +}
>> +
>> +static struct drm_plane_state *appletbdrm_primary_plane_duplicate_state(struct drm_plane *plane)
>> +{
>> +    struct drm_shadow_plane_state *new_shadow_plane_state;
>> +    struct appletbdrm_plane_state *old_appletbdrm_state;
>> +    struct appletbdrm_plane_state *appletbdrm_state;
>> +
>> +    if (WARN_ON(!plane->state))
>> +        return NULL;
>> +
>> +    old_appletbdrm_state = to_appletbdrm_plane_state(plane->state);
>> +    appletbdrm_state = kmemdup(old_appletbdrm_state, sizeof(*appletbdrm_state), GFP_KERNEL);
>> +    if (!appletbdrm_state)
>> +        return NULL;
>> +
>> +    /* Request and response are not duplicated and are allocated in .atomic_check */
>> +    appletbdrm_state->request = NULL;
>> +    appletbdrm_state->response = NULL;
> 
> You also have to clear the frame and request size, I think.
> 
> Duplicated state will be processed by the atomic_check before being used. So you'll have a chance of recomputing these temporary buffers.
> 
> Simply allocate with kzalloc instead of kmemdup() and you'll be fine.
> 
>> +
>> +    new_shadow_plane_state = &appletbdrm_state->base;
>> +
>> +    __drm_gem_duplicate_shadow_plane_state(plane, new_shadow_plane_state);
> 
> This call is important to do.
> 
>> +
>> +    return &new_shadow_plane_state->base;
>> +}
>> +
>> +static void appletbdrm_primary_plane_destroy_state(struct drm_plane *plane,
>> +                           struct drm_plane_state *state)
>> +{
>> +    struct appletbdrm_plane_state *appletbdrm_state = to_appletbdrm_plane_state(state);
>> +
>> +    kfree(appletbdrm_state->request);
>> +    kfree(appletbdrm_state->response);
>> +
>> +    __drm_gem_destroy_shadow_plane_state(&appletbdrm_state->base);
>> +
>> +    kfree(appletbdrm_state);
>> +}
>> +
>> +static const struct drm_plane_helper_funcs appletbdrm_primary_plane_helper_funcs = {
>> +    DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
>> +    .atomic_check = appletbdrm_primary_plane_helper_atomic_check,
>> +    .atomic_update = appletbdrm_primary_plane_helper_atomic_update,
>> +    .atomic_disable = appletbdrm_primary_plane_helper_atomic_disable,
>> +};
>> +
>> +static const struct drm_plane_funcs appletbdrm_primary_plane_funcs = {
>> +    .update_plane = drm_atomic_helper_update_plane,
>> +    .disable_plane = drm_atomic_helper_disable_plane,
>> +    .reset = appletbdrm_primary_plane_reset,
>> +    .atomic_duplicate_state = appletbdrm_primary_plane_duplicate_state,
>> +    .atomic_destroy_state = appletbdrm_primary_plane_destroy_state,
>> +    .destroy = drm_plane_cleanup,
>> +};
>> +
>> +static enum drm_mode_status appletbdrm_crtc_helper_mode_valid(struct drm_crtc *crtc,
>> +                              const struct drm_display_mode *mode)
>> +{
>> +    struct appletbdrm_device *adev = drm_to_adev(crtc->dev);
>> +
>> +    return drm_crtc_helper_mode_valid_fixed(crtc, mode, &adev->mode);
>> +}
>> +
>> +static const struct drm_mode_config_funcs appletbdrm_mode_config_funcs = {
>> +    .fb_create = drm_gem_fb_create_with_dirty,
>> +    .atomic_check = drm_atomic_helper_check,
>> +    .atomic_commit = drm_atomic_helper_commit,
>> +};
>> +
>> +static const struct drm_connector_funcs appletbdrm_connector_funcs = {
>> +    .reset = drm_atomic_helper_connector_reset,
>> +    .destroy = drm_connector_cleanup,
>> +    .fill_modes = drm_helper_probe_single_connector_modes,
>> +    .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
>> +    .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
>> +};
>> +
>> +static const struct drm_connector_helper_funcs appletbdrm_connector_helper_funcs = {
>> +    .get_modes = appletbdrm_connector_helper_get_modes,
>> +};
>> +
>> +static const struct drm_crtc_helper_funcs appletbdrm_crtc_helper_funcs = {
>> +    .mode_valid = appletbdrm_crtc_helper_mode_valid,
>> +};
>> +
>> +static const struct drm_crtc_funcs appletbdrm_crtc_funcs = {
>> +    .reset = drm_atomic_helper_crtc_reset,
>> +    .destroy = drm_crtc_cleanup,
>> +    .set_config = drm_atomic_helper_set_config,
>> +    .page_flip = drm_atomic_helper_page_flip,
>> +    .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
>> +    .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
>> +};
>> +
>> +static const struct drm_encoder_funcs appletbdrm_encoder_funcs = {
>> +    .destroy = drm_encoder_cleanup,
>> +};
>> +
>> +static struct drm_gem_object *appletbdrm_driver_gem_prime_import(struct drm_device *dev,
>> +                                 struct dma_buf *dma_buf)
>> +{
>> +    struct appletbdrm_device *adev = drm_to_adev(dev);
>> +
>> +    if (!adev->dmadev)
>> +        return ERR_PTR(-ENODEV);
>> +
>> +    return drm_gem_prime_import_dev(dev, dma_buf, adev->dmadev);
>> +}
>> +
>> +DEFINE_DRM_GEM_FOPS(appletbdrm_drm_fops);
>> +
>> +static const struct drm_driver appletbdrm_drm_driver = {
>> +    DRM_GEM_SHMEM_DRIVER_OPS,
>> +    .gem_prime_import    = appletbdrm_driver_gem_prime_import,
>> +    .name            = "appletbdrm",
>> +    .desc            = "Apple Touch Bar DRM Driver",
>> +    .major            = 1,
>> +    .minor            = 0,
>> +    .driver_features    = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
>> +    .fops            = &appletbdrm_drm_fops,
>> +};
>> +
>> +static int appletbdrm_setup_mode_config(struct appletbdrm_device *adev)
>> +{
>> +    struct drm_connector *connector = &adev->connector;
>> +    struct drm_plane *primary_plane;
>> +    struct drm_crtc *crtc;
>> +    struct drm_encoder *encoder;
>> +    struct drm_device *drm = &adev->drm;
>> +    struct device *dev = adev->dev;
>> +    int ret;
>> +
>> +    ret = drmm_mode_config_init(drm);
>> +    if (ret)
>> +        return dev_err_probe(dev, ret, "Failed to initialize mode configuration\n");
> 
> Use drm_err() here. It does the right thing. We don't have a drm_dev_probe() yet, but you're discouraged from useing the dev_() print helpers.
> 
> Same below.
> 
>> +
>> +    primary_plane = &adev->primary_plane;
>> +    ret = drm_universal_plane_init(drm, primary_plane, 0,
>> +                       &appletbdrm_primary_plane_funcs,
>> +                       appletbdrm_primary_plane_formats,
>> +                       ARRAY_SIZE(appletbdrm_primary_plane_formats),
>> +                       NULL,
>> +                       DRM_PLANE_TYPE_PRIMARY, NULL);
>> +    if (ret)
>> +        return dev_err_probe(dev, ret, "Failed to initialize universal plane object\n");
>> +    drm_plane_helper_add(primary_plane, &appletbdrm_primary_plane_helper_funcs);
>> +    drm_plane_enable_fb_damage_clips(primary_plane);
>> +
>> +    crtc = &adev->crtc;
>> +    ret = drm_crtc_init_with_planes(drm, crtc, primary_plane, NULL,
>> +                    &appletbdrm_crtc_funcs, NULL);
>> +    if (ret)
>> +        return dev_err_probe(dev, ret, "Failed to initialize CRTC object\n");
>> +    drm_crtc_helper_add(crtc, &appletbdrm_crtc_helper_funcs);
>> +
>> +    encoder = &adev->encoder;
>> +    ret = drm_encoder_init(drm, encoder, &appletbdrm_encoder_funcs,
>> +                   DRM_MODE_ENCODER_DAC, NULL);
>> +    if (ret)
>> +        return dev_err_probe(dev, ret, "Failed to initialize encoder\n");
>> +    encoder->possible_crtcs = drm_crtc_mask(crtc);
>> +
>> +    /*
>> +     * The coordinate system used by the device is different from the
>> +     * coordinate system of the framebuffer in that the x and y axes are
>> +     * swapped, and that the y axis is inverted; so what the device reports
>> +     * as the height is actually the width of the framebuffer and vice
>> +     * versa
>> +     */
>> +    drm->mode_config.min_width = 0;
>> +    drm->mode_config.min_height = 0;
> 
> No need to clear this to zero.
> 
>> +    drm->mode_config.max_width = max(adev->height, DRM_SHADOW_PLANE_MAX_WIDTH);
>> +    drm->mode_config.max_height = max(adev->width, DRM_SHADOW_PLANE_MAX_HEIGHT);
>> +    drm->mode_config.preferred_depth = APPLETBDRM_BITS_PER_PIXEL;
>> +    drm->mode_config.funcs = &appletbdrm_mode_config_funcs;
>> +
>> +    adev->mode = (struct drm_display_mode) {
>> +        DRM_MODE_INIT(60, adev->height, adev->width,
>> +                  DRM_MODE_RES_MM(adev->height, 218),
>> +                  DRM_MODE_RES_MM(adev->width, 218))
>> +    };
>> +
>> +    ret = drm_connector_init(drm, connector,
>> +                 &appletbdrm_connector_funcs, DRM_MODE_CONNECTOR_USB);
>> +    if (ret)
>> +        return dev_err_probe(dev, ret, "Failed to initialize connector\n");
>> +
>> +    drm_connector_helper_add(connector, &appletbdrm_connector_helper_funcs);
>> +
>> +    ret = drm_connector_set_panel_orientation(connector,
>> +                          DRM_MODE_PANEL_ORIENTATION_RIGHT_UP);
>> +    if (ret)
>> +        return dev_err_probe(dev, ret, "Failed to set panel orientation\n");
>> +
>> +    connector->display_info.non_desktop = true;
>> +    ret = drm_object_property_set_value(&connector->base,
>> +                        drm->mode_config.non_desktop_property, true);
>> +    if (ret)
>> +        return dev_err_probe(dev, ret, "Failed to set non-desktop property\n");
>> +
>> +    ret = drm_connector_attach_encoder(connector, encoder);
>> +
>> +    if (ret)
>> +        return dev_err_probe(dev, ret, "Failed to initialize simple display pipe\n");
>> +
>> +    drm_mode_config_reset(drm);
>> +
>> +    return 0;
>> +}
>> +
>> +static int appletbdrm_probe(struct usb_interface *intf,
>> +                const struct usb_device_id *id)
>> +{
>> +    struct usb_endpoint_descriptor *bulk_in, *bulk_out;
>> +    struct device *dev = &intf->dev;
>> +    struct appletbdrm_device *adev;
>> +    struct drm_device *drm;
>> +    int ret;
>> +
>> +    ret = usb_find_common_endpoints(intf->cur_altsetting, &bulk_in, &bulk_out, NULL, NULL);
>> +    if (ret)
>> +        return dev_err_probe(dev, ret, "Failed to find bulk endpoints\n");
>> +
>> +    adev = devm_drm_dev_alloc(dev, &appletbdrm_drm_driver, struct appletbdrm_device, drm);
>> +    if (IS_ERR(adev))
>> +        return PTR_ERR(adev);
>> +
>> +    adev->dev = dev;
>> +    adev->in_ep = bulk_in->bEndpointAddress;
>> +    adev->out_ep = bulk_out->bEndpointAddress;
>> +
>> +    drm = &adev->drm;
>> +
>> +    usb_set_intfdata(intf, adev);
>> +
>> +    ret = appletbdrm_get_information(adev);
>> +    if (ret)
>> +        return dev_err_probe(dev, ret, "Failed to get display information\n");
>> +
>> +    ret = appletbdrm_signal_readiness(adev);
>> +    if (ret)
>> +        return dev_err_probe(dev, ret, "Failed to signal readiness\n");
>> +
>> +    ret = appletbdrm_setup_mode_config(adev);
>> +    if (ret)
>> +        return dev_err_probe(dev, ret, "Failed to setup mode config\n");
>> +
>> +    ret = drm_dev_register(drm, 0);
>> +    if (ret)
>> +        return dev_err_probe(dev, ret, "Failed to register DRM device\n");
>> +
>> +    ret = appletbdrm_clear_display(adev);
>> +    if (ret)
>> +        return dev_err_probe(dev, ret, "Failed to clear display\n");
>> +
>> +    return 0;
>> +}
>> +
>> +static void appletbdrm_disconnect(struct usb_interface *intf)
>> +{
>> +    struct appletbdrm_device *adev = usb_get_intfdata(intf);
>> +    struct drm_device *drm = &adev->drm;
>> +
> 
> You have to put_device(dmadev) to release the DMA device.
> 
> Best regards
> Thomas
> 
>> +    drm_dev_unplug(drm);
>> +    drm_atomic_helper_shutdown(drm);
>> +}
>> +
>> +static void appletbdrm_shutdown(struct usb_interface *intf)
>> +{
>> +    struct appletbdrm_device *adev = usb_get_intfdata(intf);
>> +
>> +    /*
>> +     * The framebuffer needs to be cleared on shutdown since its content
>> +     * persists across boots
>> +     */
>> +    drm_atomic_helper_shutdown(&adev->drm);
>> +}
>> +
>> +static const struct usb_device_id appletbdrm_usb_id_table[] = {
>> +    { USB_DEVICE_INTERFACE_CLASS(0x05ac, 0x8302, USB_CLASS_AUDIO_VIDEO) },
>> +    {}
>> +};
>> +MODULE_DEVICE_TABLE(usb, appletbdrm_usb_id_table);
>> +
>> +static struct usb_driver appletbdrm_usb_driver = {
>> +    .name        = "appletbdrm",
>> +    .probe        = appletbdrm_probe,
>> +    .disconnect    = appletbdrm_disconnect,
>> +    .shutdown    = appletbdrm_shutdown,
>> +    .id_table    = appletbdrm_usb_id_table,
>> +};
>> +module_usb_driver(appletbdrm_usb_driver);
>> +
>> +MODULE_AUTHOR("Kerem Karabay <kekrby@gmail.com>");
>> +MODULE_DESCRIPTION("Apple Touch Bar DRM Driver");
>> +MODULE_LICENSE("GPL");
> 
> --
> --
> Thomas Zimmermann
> Graphics Driver Developer
> SUSE Software Solutions Germany GmbH
> Frankenstrasse 146, 90461 Nuernberg, Germany
> GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
> HRB 36809 (AG Nuernberg)
> 

Re: [PATCH v3 1/3] drm/format-helper: Add conversion from XRGB8888 to BGR888

[andriy.shevchenko]

On Fri, Feb 21, 2025 at 11:36:00AM +0000, Aditya Garg wrote:
> From: Kerem Karabay <kekrby@gmail.com>
> 
> Add XRGB8888 emulation helper for devices that only support BGR888.

...

> +	for (x = 0; x < pixels; x++) {
> +		pix = le32_to_cpu(sbuf32[x]);
> +		/* write red-green-blue to output in little endianness */
> +		*dbuf8++ = (pix & 0x00ff0000) >> 16;
> +		*dbuf8++ = (pix & 0x0000ff00) >> 8;
> +		*dbuf8++ = (pix & 0x000000ff) >> 0;

put_unaligned_be24()

> +	}

...

> +	static const u8 dst_pixsize[DRM_FORMAT_MAX_PLANES] = {
> +		3,
> +	};

One line?

	static const u8 dst_pixsize[DRM_FORMAT_MAX_PLANES] = { 3 };

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v3 1/3] drm/format-helper: Add conversion from XRGB8888 to BGR888

[Aditya Garg]

Hi Andy

> On 21 Feb 2025, at 9:21 PM, andriy.shevchenko@linux.intel.com wrote:
> 
> On Fri, Feb 21, 2025 at 11:36:00AM +0000, Aditya Garg wrote:
>> From: Kerem Karabay <kekrby@gmail.com>
>> 
>> Add XRGB8888 emulation helper for devices that only support BGR888.
> 
> ...
> 
>> + for (x = 0; x < pixels; x++) {
>> + pix = le32_to_cpu(sbuf32[x]);
>> + /* write red-green-blue to output in little endianness */
>> + *dbuf8++ = (pix & 0x00ff0000) >> 16;
>> + *dbuf8++ = (pix & 0x0000ff00) >> 8;
>> + *dbuf8++ = (pix & 0x000000ff) >> 0;
> 
> put_unaligned_be24()
> 
>> + }
> 
> ...
> 
>> + static const u8 dst_pixsize[DRM_FORMAT_MAX_PLANES] = {
>> + 3,
>> + };
> 
> One line?
> 
> static const u8 dst_pixsize[DRM_FORMAT_MAX_PLANES] = { 3 };

Wrt all the above respective changes, the formatting has been done exactly like what other emulation helps do in the upstream patch.

I doubt Thomas would want these changes to be done, or would want these changes to be done for the upstream emulation helpers as well.

For reference: https://github.com/torvalds/linux/blob/master/drivers/gpu/drm/drm_format_helper.c

Regards
Aditya

Re: [PATCH v3 1/3] drm/format-helper: Add conversion from XRGB8888 to BGR888

[andriy.shevchenko]

On Fri, Feb 21, 2025 at 05:21:08PM +0000, Aditya Garg wrote:
> > On 21 Feb 2025, at 9:21 PM, andriy.shevchenko@linux.intel.com wrote:
> > On Fri, Feb 21, 2025 at 11:36:00AM +0000, Aditya Garg wrote:

...

> >> + for (x = 0; x < pixels; x++) {
> >> + pix = le32_to_cpu(sbuf32[x]);
> >> + /* write red-green-blue to output in little endianness */
> >> + *dbuf8++ = (pix & 0x00ff0000) >> 16;
> >> + *dbuf8++ = (pix & 0x0000ff00) >> 8;
> >> + *dbuf8++ = (pix & 0x000000ff) >> 0;
> > 
> > put_unaligned_be24()

(1)

> >> + }

...

> >> + static const u8 dst_pixsize[DRM_FORMAT_MAX_PLANES] = {
> >> + 3,
> >> + };
> > 
> > One line?
> > 
> > static const u8 dst_pixsize[DRM_FORMAT_MAX_PLANES] = { 3 };
> 
> Wrt all the above respective changes, the formatting has been done exactly like what other emulation helps do in the upstream patch.
> 
> I doubt Thomas would want these changes to be done, or would want these changes to be done for the upstream emulation helpers as well.
> 
> For reference: https://github.com/torvalds/linux/blob/master/drivers/gpu/drm/drm_format_helper.c

I'm not sure how this is applicable to (1) above. Otherwise it's fine if there
is a documented style or due to consistency with the existing style.

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v3 1/3] drm/format-helper: Add conversion from XRGB8888 to BGR888

[Thomas Zimmermann]

Hi

Am 21.02.25 um 16:51 schrieb andriy.shevchenko@linux.intel.com:
> On Fri, Feb 21, 2025 at 11:36:00AM +0000, Aditya Garg wrote:
>> From: Kerem Karabay <kekrby@gmail.com>
>>
>> Add XRGB8888 emulation helper for devices that only support BGR888.
> ...
>
>> +	for (x = 0; x < pixels; x++) {
>> +		pix = le32_to_cpu(sbuf32[x]);
>> +		/* write red-green-blue to output in little endianness */
>> +		*dbuf8++ = (pix & 0x00ff0000) >> 16;
>> +		*dbuf8++ = (pix & 0x0000ff00) >> 8;
>> +		*dbuf8++ = (pix & 0x000000ff) >> 0;
> put_unaligned_be24()

I'm all for sharing helper code, but maybe not here.

- DRM pixel formats are always little endian.
- CPU encoding is LE or BE.
- Pixel-component order can be anything: RGB/BGR/etc.

So the code has a comment to explain what happens here. Adding that call 
with the _be24 postfix into the mix would make it more confusing.


>
>> +	}
> ...
>
>> +	static const u8 dst_pixsize[DRM_FORMAT_MAX_PLANES] = {
>> +		3,
>> +	};
> One line?
>
> 	static const u8 dst_pixsize[DRM_FORMAT_MAX_PLANES] = { 3 };

I'd be ok, if there's a string preference in the kernel to use thins 
style. Most of DRM doesn't AFAIK.

Best regards
Thomas

>

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)

Re: [PATCH v3 1/3] drm/format-helper: Add conversion from XRGB8888 to BGR888

[andriy.shevchenko]

On Mon, Feb 24, 2025 at 10:19:13AM +0100, Thomas Zimmermann wrote:
> Am 21.02.25 um 16:51 schrieb andriy.shevchenko@linux.intel.com:
> > On Fri, Feb 21, 2025 at 11:36:00AM +0000, Aditya Garg wrote:

...

> > > +	for (x = 0; x < pixels; x++) {
> > > +		pix = le32_to_cpu(sbuf32[x]);
> > > +		/* write red-green-blue to output in little endianness */
> > > +		*dbuf8++ = (pix & 0x00ff0000) >> 16;
> > > +		*dbuf8++ = (pix & 0x0000ff00) >> 8;
> > > +		*dbuf8++ = (pix & 0x000000ff) >> 0;
> > put_unaligned_be24()
> 
> I'm all for sharing helper code, but maybe not here.
> 
> - DRM pixel formats are always little endian.
> - CPU encoding is LE or BE.
> - Pixel-component order can be anything: RGB/BGR/etc.
> 
> So the code has a comment to explain what happens here. Adding that call
> with the _be24 postfix into the mix would make it more confusing.

I'm not objecting the comment, the code has definite meaning and with the
proposed helper it makes clearer (in my opinion).

Comment can be adjusted to explain better this conversion.

Or, perhaps pix should be be32? That's probably where confusion starts.

		pix = be32_to_cpu(sbuf32[x]);

		/* write red-green-blue to output in little endianness */
		put_unaligned_le24(...);

?

> > > +	}

...

> > > +	static const u8 dst_pixsize[DRM_FORMAT_MAX_PLANES] = {
> > > +		3,
> > > +	};
> > One line?
> > 
> > 	static const u8 dst_pixsize[DRM_FORMAT_MAX_PLANES] = { 3 };
> 
> I'd be ok, if there's a string preference in the kernel to use thins style.

Just a common sense to avoid more LoCs when it's not needed / redundant.

> Most of DRM doesn't AFAIK.

-- 
With Best Regards,
Andy Shevchenko