[PATCH v3 0/3] drm/tests: Update format-helper tests for sysfb

[PATCH v3 0/3] drm/tests: Update format-helper tests for sysfb

[Thomas Zimmermann]

The helpers drm_fb_blit() and drm_fb_build_fourcc_list() will be
integrated into sysfb helpers. Update the DRM format-helper tests
accordingly in patches 1 and 2.

The change to drm_fb_build_fourcc_list() is simple enough that we
can apply it here in patch 3.

v3:
- rename symbols (José)
v2:
- fix test filename (Maxime)
- fix dependencies (kernel test robot)

Thomas Zimmermann (3):
  drm/tests: Do not use drm_fb_blit() in format-helper tests
  drm/tests: Test drm_fb_build_fourcc_list() in separate test suite
  drm/format-helper: Move drm_fb_build_fourcc_list() to sysfb helpers

 drivers/gpu/drm/Kconfig.debug                 |   1 +
 drivers/gpu/drm/drm_format_helper.c           | 246 +++++++----------
 drivers/gpu/drm/drm_format_internal.h         |   8 +
 drivers/gpu/drm/sysfb/drm_sysfb_helper.h      |   4 +
 drivers/gpu/drm/sysfb/drm_sysfb_modeset.c     | 138 ++++++++++
 drivers/gpu/drm/sysfb/efidrm.c                |   4 +-
 drivers/gpu/drm/sysfb/ofdrm.c                 |   5 +-
 drivers/gpu/drm/sysfb/simpledrm.c             |   5 +-
 drivers/gpu/drm/sysfb/vesadrm.c               |   4 +-
 drivers/gpu/drm/tests/Makefile                |   3 +-
 .../gpu/drm/tests/drm_format_helper_test.c    | 250 ++----------------
 .../gpu/drm/tests/drm_sysfb_modeset_test.c    | 168 ++++++++++++
 include/drm/drm_format_helper.h               |  13 +-
 13 files changed, 452 insertions(+), 397 deletions(-)
 create mode 100644 drivers/gpu/drm/tests/drm_sysfb_modeset_test.c

-- 
2.49.0

[PATCH v3 1/3] drm/tests: Do not use drm_fb_blit() in format-helper tests

[Thomas Zimmermann]

Export additional helpers from the format-helper library and open-code
drm_fb_blit() in tests. Prepares for the removal of drm_fb_blit(). Only
sysfb drivers use drm_fb_blit(). The function will soon be removed from
format helpers and be refactored within sysfb helpers.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: José Expósito <jose.exposito89@gmail.com>
Acked-by: Maxime Ripard <mripard@kernel.org>
---
 drivers/gpu/drm/drm_format_helper.c           | 108 ++++++++++++++++--
 drivers/gpu/drm/drm_format_internal.h         |   8 ++
 .../gpu/drm/tests/drm_format_helper_test.c    | 108 +++---------------
 include/drm/drm_format_helper.h               |   9 ++
 4 files changed, 131 insertions(+), 102 deletions(-)

diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c
index 0c04247ef702..63dc46f9fc49 100644
--- a/drivers/gpu/drm/drm_format_helper.c
+++ b/drivers/gpu/drm/drm_format_helper.c
@@ -858,11 +858,33 @@ static void drm_fb_xrgb8888_to_abgr8888_line(void *dbuf, const void *sbuf, unsig
 	drm_fb_xfrm_line_32to32(dbuf, sbuf, pixels, drm_pixel_xrgb8888_to_abgr8888);
 }
 
-static void drm_fb_xrgb8888_to_abgr8888(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)
+/**
+ * drm_fb_xrgb8888_to_abgr8888 - Convert XRGB8888 to ABGR8888 clip buffer
+ * @dst: Array of ABGR8888 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 buffer
+ * @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. 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 ABGR8888 devices that don't support XRGB8888
+ * natively. It sets an opaque alpha channel as part of the conversion.
+ */
+void drm_fb_xrgb8888_to_abgr8888(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] = {
 		4,
@@ -871,17 +893,40 @@ static void drm_fb_xrgb8888_to_abgr8888(struct iosys_map *dst, const unsigned in
 	drm_fb_xfrm(dst, dst_pitch, dst_pixsize, src, fb, clip, false, state,
 		    drm_fb_xrgb8888_to_abgr8888_line);
 }
+EXPORT_SYMBOL(drm_fb_xrgb8888_to_abgr8888);
 
 static void drm_fb_xrgb8888_to_xbgr8888_line(void *dbuf, const void *sbuf, unsigned int pixels)
 {
 	drm_fb_xfrm_line_32to32(dbuf, sbuf, pixels, drm_pixel_xrgb8888_to_xbgr8888);
 }
 
-static void drm_fb_xrgb8888_to_xbgr8888(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)
+/**
+ * drm_fb_xrgb8888_to_xbgr8888 - Convert XRGB8888 to XBGR8888 clip buffer
+ * @dst: Array of XBGR8888 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 buffer
+ * @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. 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 XBGR8888 devices that don't support XRGB8888
+ * natively.
+ */
+void drm_fb_xrgb8888_to_xbgr8888(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] = {
 		4,
@@ -890,6 +935,49 @@ static void drm_fb_xrgb8888_to_xbgr8888(struct iosys_map *dst, const unsigned in
 	drm_fb_xfrm(dst, dst_pitch, dst_pixsize, src, fb, clip, false, state,
 		    drm_fb_xrgb8888_to_xbgr8888_line);
 }
+EXPORT_SYMBOL(drm_fb_xrgb8888_to_xbgr8888);
+
+static void drm_fb_xrgb8888_to_bgrx8888_line(void *dbuf, const void *sbuf, unsigned int pixels)
+{
+	drm_fb_xfrm_line_32to32(dbuf, sbuf, pixels, drm_pixel_xrgb8888_to_bgrx8888);
+}
+
+/**
+ * drm_fb_xrgb8888_to_bgrx8888 - Convert XRGB8888 to BGRX8888 clip buffer
+ * @dst: Array of BGRX8888 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 buffer
+ * @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. 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 BGRX8888 devices that don't support XRGB8888
+ * natively.
+ */
+void drm_fb_xrgb8888_to_bgrx8888(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] = {
+		4,
+	};
+
+	drm_fb_xfrm(dst, dst_pitch, dst_pixsize, src, fb, clip, false, state,
+		    drm_fb_xrgb8888_to_bgrx8888_line);
+}
+EXPORT_SYMBOL(drm_fb_xrgb8888_to_bgrx8888);
 
 static void drm_fb_xrgb8888_to_xrgb2101010_line(void *dbuf, const void *sbuf, unsigned int pixels)
 {
diff --git a/drivers/gpu/drm/drm_format_internal.h b/drivers/gpu/drm/drm_format_internal.h
index 3020ff267513..9428d5cfebc5 100644
--- a/drivers/gpu/drm/drm_format_internal.h
+++ b/drivers/gpu/drm/drm_format_internal.h
@@ -111,6 +111,14 @@ static inline u32 drm_pixel_xrgb8888_to_xbgr8888(u32 pix)
 	       ((pix & 0x000000ff) << 16);
 }
 
+static inline u32 drm_pixel_xrgb8888_to_bgrx8888(u32 pix)
+{
+	return ((pix & 0xff000000) >> 24) | /* also copy filler bits */
+	       ((pix & 0x00ff0000) >> 8) |
+	       ((pix & 0x0000ff00) << 8) |
+	       ((pix & 0x000000ff) << 24);
+}
+
 static inline u32 drm_pixel_xrgb8888_to_abgr8888(u32 pix)
 {
 	return GENMASK(31, 24) | /* fill alpha bits */
diff --git a/drivers/gpu/drm/tests/drm_format_helper_test.c b/drivers/gpu/drm/tests/drm_format_helper_test.c
index 5aa8543ceb29..7fd4eac3c55e 100644
--- a/drivers/gpu/drm/tests/drm_format_helper_test.c
+++ b/drivers/gpu/drm/tests/drm_format_helper_test.c
@@ -748,14 +748,9 @@ static void drm_test_fb_xrgb8888_to_rgb565(struct kunit *test)
 	buf = dst.vaddr;
 	memset(buf, 0, dst_size);
 
-	int blit_result = 0;
-
-	blit_result = drm_fb_blit(&dst, dst_pitch, DRM_FORMAT_RGB565, &src, &fb, &params->clip,
-				  &fmtcnv_state);
-
+	drm_fb_xrgb8888_to_rgb565(&dst, dst_pitch, &src, &fb, &params->clip,
+				  &fmtcnv_state, false);
 	buf = le16buf_to_cpu(test, (__force const __le16 *)buf, dst_size / sizeof(__le16));
-
-	KUNIT_EXPECT_FALSE(test, blit_result);
 	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
 }
 
@@ -795,14 +790,8 @@ static void drm_test_fb_xrgb8888_to_xrgb1555(struct kunit *test)
 	buf = dst.vaddr; /* restore original value of buf */
 	memset(buf, 0, dst_size);
 
-	int blit_result = 0;
-
-	blit_result = drm_fb_blit(&dst, dst_pitch, DRM_FORMAT_XRGB1555, &src, &fb, &params->clip,
-				  &fmtcnv_state);
-
+	drm_fb_xrgb8888_to_xrgb1555(&dst, dst_pitch, &src, &fb, &params->clip, &fmtcnv_state);
 	buf = le16buf_to_cpu(test, (__force const __le16 *)buf, dst_size / sizeof(__le16));
-
-	KUNIT_EXPECT_FALSE(test, blit_result);
 	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
 }
 
@@ -842,14 +831,8 @@ static void drm_test_fb_xrgb8888_to_argb1555(struct kunit *test)
 	buf = dst.vaddr; /* restore original value of buf */
 	memset(buf, 0, dst_size);
 
-	int blit_result = 0;
-
-	blit_result = drm_fb_blit(&dst, dst_pitch, DRM_FORMAT_ARGB1555, &src, &fb, &params->clip,
-				  &fmtcnv_state);
-
+	drm_fb_xrgb8888_to_argb1555(&dst, dst_pitch, &src, &fb, &params->clip, &fmtcnv_state);
 	buf = le16buf_to_cpu(test, (__force const __le16 *)buf, dst_size / sizeof(__le16));
-
-	KUNIT_EXPECT_FALSE(test, blit_result);
 	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
 }
 
@@ -889,14 +872,8 @@ static void drm_test_fb_xrgb8888_to_rgba5551(struct kunit *test)
 	buf = dst.vaddr; /* restore original value of buf */
 	memset(buf, 0, dst_size);
 
-	int blit_result = 0;
-
-	blit_result = drm_fb_blit(&dst, dst_pitch, DRM_FORMAT_RGBA5551, &src, &fb, &params->clip,
-				  &fmtcnv_state);
-
+	drm_fb_xrgb8888_to_rgba5551(&dst, dst_pitch, &src, &fb, &params->clip, &fmtcnv_state);
 	buf = le16buf_to_cpu(test, (__force const __le16 *)buf, dst_size / sizeof(__le16));
-
-	KUNIT_EXPECT_FALSE(test, blit_result);
 	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
 }
 
@@ -939,12 +916,7 @@ static void drm_test_fb_xrgb8888_to_rgb888(struct kunit *test)
 	buf = dst.vaddr; /* restore original value of buf */
 	memset(buf, 0, dst_size);
 
-	int blit_result = 0;
-
-	blit_result = drm_fb_blit(&dst, dst_pitch, DRM_FORMAT_RGB888, &src, &fb, &params->clip,
-				  &fmtcnv_state);
-
-	KUNIT_EXPECT_FALSE(test, blit_result);
+	drm_fb_xrgb8888_to_rgb888(&dst, dst_pitch, &src, &fb, &params->clip, &fmtcnv_state);
 	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
 }
 
@@ -985,12 +957,8 @@ static void drm_test_fb_xrgb8888_to_bgr888(struct kunit *test)
 	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,
+	drm_fb_xrgb8888_to_bgr888(&dst, &result->dst_pitch, &src, &fb, &params->clip,
 				  &fmtcnv_state);
-
-	KUNIT_EXPECT_FALSE(test, blit_result);
 	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
 }
 
@@ -1030,14 +998,8 @@ static void drm_test_fb_xrgb8888_to_argb8888(struct kunit *test)
 	buf = dst.vaddr; /* restore original value of buf */
 	memset(buf, 0, dst_size);
 
-	int blit_result = 0;
-
-	blit_result = drm_fb_blit(&dst, dst_pitch, DRM_FORMAT_ARGB8888, &src, &fb, &params->clip,
-				  &fmtcnv_state);
-
+	drm_fb_xrgb8888_to_argb8888(&dst, dst_pitch, &src, &fb, &params->clip, &fmtcnv_state);
 	buf = le32buf_to_cpu(test, (__force const __le32 *)buf, dst_size / sizeof(u32));
-
-	KUNIT_EXPECT_FALSE(test, blit_result);
 	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
 }
 
@@ -1077,12 +1039,7 @@ static void drm_test_fb_xrgb8888_to_xrgb2101010(struct kunit *test)
 	buf = dst.vaddr; /* restore original value of buf */
 	memset(buf, 0, dst_size);
 
-	int blit_result = 0;
-
-	blit_result = drm_fb_blit(&dst, dst_pitch, DRM_FORMAT_XRGB2101010, &src, &fb,
-				  &params->clip, &fmtcnv_state);
-
-	KUNIT_EXPECT_FALSE(test, blit_result);
+	drm_fb_xrgb8888_to_xrgb2101010(&dst, dst_pitch, &src, &fb, &params->clip, &fmtcnv_state);
 	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
 }
 
@@ -1122,14 +1079,8 @@ static void drm_test_fb_xrgb8888_to_argb2101010(struct kunit *test)
 	buf = dst.vaddr; /* restore original value of buf */
 	memset(buf, 0, dst_size);
 
-	int blit_result = 0;
-
-	blit_result = drm_fb_blit(&dst, dst_pitch, DRM_FORMAT_ARGB2101010, &src, &fb,
-				  &params->clip, &fmtcnv_state);
-
+	drm_fb_xrgb8888_to_argb2101010(&dst, dst_pitch, &src, &fb, &params->clip, &fmtcnv_state);
 	buf = le32buf_to_cpu(test, (__force const __le32 *)buf, dst_size / sizeof(u32));
-
-	KUNIT_EXPECT_FALSE(test, blit_result);
 	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
 }
 
@@ -1202,23 +1153,15 @@ static void drm_test_fb_swab(struct kunit *test)
 	buf = dst.vaddr; /* restore original value of buf */
 	memset(buf, 0, dst_size);
 
-	int blit_result;
-
-	blit_result = drm_fb_blit(&dst, dst_pitch, DRM_FORMAT_XRGB8888 | DRM_FORMAT_BIG_ENDIAN,
-				  &src, &fb, &params->clip, &fmtcnv_state);
+	drm_fb_swab(&dst, dst_pitch, &src, &fb, &params->clip, false, &fmtcnv_state);
 	buf = le32buf_to_cpu(test, (__force const __le32 *)buf, dst_size / sizeof(u32));
-
-	KUNIT_EXPECT_FALSE(test, blit_result);
 	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
 
 	buf = dst.vaddr;
 	memset(buf, 0, dst_size);
 
-	blit_result = drm_fb_blit(&dst, dst_pitch, DRM_FORMAT_BGRX8888, &src, &fb, &params->clip,
-				  &fmtcnv_state);
+	drm_fb_xrgb8888_to_bgrx8888(&dst, dst_pitch, &src, &fb, &params->clip, &fmtcnv_state);
 	buf = le32buf_to_cpu(test, (__force const __le32 *)buf, dst_size / sizeof(u32));
-
-	KUNIT_EXPECT_FALSE(test, blit_result);
 	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
 
 	buf = dst.vaddr;
@@ -1229,11 +1172,8 @@ static void drm_test_fb_swab(struct kunit *test)
 	mock_format.format |= DRM_FORMAT_BIG_ENDIAN;
 	fb.format = &mock_format;
 
-	blit_result = drm_fb_blit(&dst, dst_pitch, DRM_FORMAT_XRGB8888, &src, &fb, &params->clip,
-				  &fmtcnv_state);
+	drm_fb_swab(&dst, dst_pitch, &src, &fb, &params->clip, false, &fmtcnv_state);
 	buf = le32buf_to_cpu(test, (__force const __le32 *)buf, dst_size / sizeof(u32));
-
-	KUNIT_EXPECT_FALSE(test, blit_result);
 	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
 }
 
@@ -1266,14 +1206,8 @@ static void drm_test_fb_xrgb8888_to_abgr8888(struct kunit *test)
 	const unsigned int *dst_pitch = (result->dst_pitch == TEST_USE_DEFAULT_PITCH) ?
 		NULL : &result->dst_pitch;
 
-	int blit_result = 0;
-
-	blit_result = drm_fb_blit(&dst, dst_pitch, DRM_FORMAT_ABGR8888, &src, &fb, &params->clip,
-				  &fmtcnv_state);
-
+	drm_fb_xrgb8888_to_abgr8888(&dst, dst_pitch, &src, &fb, &params->clip, &fmtcnv_state);
 	buf = le32buf_to_cpu(test, (__force const __le32 *)buf, dst_size / sizeof(u32));
-
-	KUNIT_EXPECT_FALSE(test, blit_result);
 	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
 }
 
@@ -1306,14 +1240,8 @@ static void drm_test_fb_xrgb8888_to_xbgr8888(struct kunit *test)
 	const unsigned int *dst_pitch = (result->dst_pitch == TEST_USE_DEFAULT_PITCH) ?
 		NULL : &result->dst_pitch;
 
-	int blit_result = 0;
-
-	blit_result = drm_fb_blit(&dst, dst_pitch, DRM_FORMAT_XBGR8888, &src, &fb, &params->clip,
-				  &fmtcnv_state);
-
+	drm_fb_xrgb8888_to_xbgr8888(&dst, dst_pitch, &src, &fb, &params->clip, &fmtcnv_state);
 	buf = le32buf_to_cpu(test, (__force const __le32 *)buf, dst_size / sizeof(u32));
-
-	KUNIT_EXPECT_FALSE(test, blit_result);
 	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
 }
 
@@ -1910,12 +1838,8 @@ static void drm_test_fb_memcpy(struct kunit *test)
 		memset(buf[i], 0, dst_size[i]);
 	}
 
-	int blit_result;
-
-	blit_result = drm_fb_blit(dst, dst_pitches, params->format, src, &fb, &params->clip,
-				  &fmtcnv_state);
+	drm_fb_memcpy(dst, dst_pitches, src, &fb, &params->clip);
 
-	KUNIT_EXPECT_FALSE(test, blit_result);
 	for (size_t i = 0; i < fb.format->num_planes; i++) {
 		expected[i] = cpubuf_to_le32(test, params->expected[i], TEST_BUF_SIZE);
 		KUNIT_EXPECT_MEMEQ_MSG(test, buf[i], expected[i], dst_size[i],
diff --git a/include/drm/drm_format_helper.h b/include/drm/drm_format_helper.h
index d8539174ca11..49a2e09155d1 100644
--- a/include/drm/drm_format_helper.h
+++ b/include/drm/drm_format_helper.h
@@ -102,6 +102,15 @@ void drm_fb_xrgb8888_to_bgr888(struct iosys_map *dst, const unsigned int *dst_pi
 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);
+void drm_fb_xrgb8888_to_abgr8888(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_xbgr8888(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_bgrx8888(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_xrgb2101010(struct iosys_map *dst, const unsigned int *dst_pitch,
 				    const struct iosys_map *src, const struct drm_framebuffer *fb,
 				    const struct drm_rect *clip,
-- 
2.49.0

[PATCH v3 2/3] drm/tests: Test drm_fb_build_fourcc_list() in separate test suite

[Thomas Zimmermann]

Only sysfb drivers use drm_fb_build_fourcc_list(). The helper will
be moved from format helpers to sysfb helpers. Moving the related
tests to their own test suite.

v3:
- rename tests according to filename (José)
v2:
- rename filename to match tested code (Maxime)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: José Expósito <jose.exposito89@gmail.com>
Acked-by: Maxime Ripard <mripard@kernel.org>
---
 drivers/gpu/drm/tests/Makefile                |   3 +-
 .../gpu/drm/tests/drm_format_helper_test.c    | 142 ---------------
 .../gpu/drm/tests/drm_sysfb_modeset_test.c    | 166 ++++++++++++++++++
 3 files changed, 168 insertions(+), 143 deletions(-)
 create mode 100644 drivers/gpu/drm/tests/drm_sysfb_modeset_test.c

diff --git a/drivers/gpu/drm/tests/Makefile b/drivers/gpu/drm/tests/Makefile
index 3afd6587df08..c0e952293ad0 100644
--- a/drivers/gpu/drm/tests/Makefile
+++ b/drivers/gpu/drm/tests/Makefile
@@ -23,6 +23,7 @@ obj-$(CONFIG_DRM_KUNIT_TEST) += \
 	drm_modes_test.o \
 	drm_plane_helper_test.o \
 	drm_probe_helper_test.o \
-	drm_rect_test.o
+	drm_rect_test.o \
+	drm_sysfb_modeset_test.o
 
 CFLAGS_drm_mm_test.o := $(DISABLE_STRUCTLEAK_PLUGIN)
diff --git a/drivers/gpu/drm/tests/drm_format_helper_test.c b/drivers/gpu/drm/tests/drm_format_helper_test.c
index 7fd4eac3c55e..ad06762db671 100644
--- a/drivers/gpu/drm/tests/drm_format_helper_test.c
+++ b/drivers/gpu/drm/tests/drm_format_helper_test.c
@@ -1335,147 +1335,6 @@ static void drm_test_fb_clip_offset(struct kunit *test)
 	KUNIT_EXPECT_EQ(test, offset, params->expected_offset);
 }
 
-struct fb_build_fourcc_list_case {
-	const char *name;
-	u32 native_fourccs[TEST_BUF_SIZE];
-	size_t native_fourccs_size;
-	u32 expected[TEST_BUF_SIZE];
-	size_t expected_fourccs_size;
-};
-
-static struct fb_build_fourcc_list_case fb_build_fourcc_list_cases[] = {
-	{
-		.name = "no native formats",
-		.native_fourccs = { },
-		.native_fourccs_size = 0,
-		.expected = { DRM_FORMAT_XRGB8888 },
-		.expected_fourccs_size = 1,
-	},
-	{
-		.name = "XRGB8888 as native format",
-		.native_fourccs = { DRM_FORMAT_XRGB8888 },
-		.native_fourccs_size = 1,
-		.expected = { DRM_FORMAT_XRGB8888 },
-		.expected_fourccs_size = 1,
-	},
-	{
-		.name = "remove duplicates",
-		.native_fourccs = {
-			DRM_FORMAT_XRGB8888,
-			DRM_FORMAT_XRGB8888,
-			DRM_FORMAT_RGB888,
-			DRM_FORMAT_RGB888,
-			DRM_FORMAT_RGB888,
-			DRM_FORMAT_XRGB8888,
-			DRM_FORMAT_RGB888,
-			DRM_FORMAT_RGB565,
-			DRM_FORMAT_RGB888,
-			DRM_FORMAT_XRGB8888,
-			DRM_FORMAT_RGB565,
-			DRM_FORMAT_RGB565,
-			DRM_FORMAT_XRGB8888,
-		},
-		.native_fourccs_size = 11,
-		.expected = {
-			DRM_FORMAT_XRGB8888,
-			DRM_FORMAT_RGB888,
-			DRM_FORMAT_RGB565,
-		},
-		.expected_fourccs_size = 3,
-	},
-	{
-		.name = "convert alpha formats",
-		.native_fourccs = {
-			DRM_FORMAT_ARGB1555,
-			DRM_FORMAT_ABGR1555,
-			DRM_FORMAT_RGBA5551,
-			DRM_FORMAT_BGRA5551,
-			DRM_FORMAT_ARGB8888,
-			DRM_FORMAT_ABGR8888,
-			DRM_FORMAT_RGBA8888,
-			DRM_FORMAT_BGRA8888,
-			DRM_FORMAT_ARGB2101010,
-			DRM_FORMAT_ABGR2101010,
-			DRM_FORMAT_RGBA1010102,
-			DRM_FORMAT_BGRA1010102,
-		},
-		.native_fourccs_size = 12,
-		.expected = {
-			DRM_FORMAT_XRGB1555,
-			DRM_FORMAT_XBGR1555,
-			DRM_FORMAT_RGBX5551,
-			DRM_FORMAT_BGRX5551,
-			DRM_FORMAT_XRGB8888,
-			DRM_FORMAT_XBGR8888,
-			DRM_FORMAT_RGBX8888,
-			DRM_FORMAT_BGRX8888,
-			DRM_FORMAT_XRGB2101010,
-			DRM_FORMAT_XBGR2101010,
-			DRM_FORMAT_RGBX1010102,
-			DRM_FORMAT_BGRX1010102,
-		},
-		.expected_fourccs_size = 12,
-	},
-	{
-		.name = "random formats",
-		.native_fourccs = {
-			DRM_FORMAT_Y212,
-			DRM_FORMAT_ARGB1555,
-			DRM_FORMAT_ABGR16161616F,
-			DRM_FORMAT_C8,
-			DRM_FORMAT_BGR888,
-			DRM_FORMAT_XRGB1555,
-			DRM_FORMAT_RGBA5551,
-			DRM_FORMAT_BGR565_A8,
-			DRM_FORMAT_R10,
-			DRM_FORMAT_XYUV8888,
-		},
-		.native_fourccs_size = 10,
-		.expected = {
-			DRM_FORMAT_Y212,
-			DRM_FORMAT_XRGB1555,
-			DRM_FORMAT_ABGR16161616F,
-			DRM_FORMAT_C8,
-			DRM_FORMAT_BGR888,
-			DRM_FORMAT_RGBX5551,
-			DRM_FORMAT_BGR565_A8,
-			DRM_FORMAT_R10,
-			DRM_FORMAT_XYUV8888,
-			DRM_FORMAT_XRGB8888,
-		},
-		.expected_fourccs_size = 10,
-	},
-};
-
-static void fb_build_fourcc_list_case_desc(struct fb_build_fourcc_list_case *t, char *desc)
-{
-	strscpy(desc, t->name, KUNIT_PARAM_DESC_SIZE);
-}
-
-KUNIT_ARRAY_PARAM(fb_build_fourcc_list, fb_build_fourcc_list_cases, fb_build_fourcc_list_case_desc);
-
-static void drm_test_fb_build_fourcc_list(struct kunit *test)
-{
-	const struct fb_build_fourcc_list_case *params = test->param_value;
-	u32 fourccs_out[TEST_BUF_SIZE] = {0};
-	size_t nfourccs_out;
-	struct drm_device *drm;
-	struct device *dev;
-
-	dev = drm_kunit_helper_alloc_device(test);
-	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, dev);
-
-	drm = __drm_kunit_helper_alloc_drm_device(test, dev, sizeof(*drm), 0, DRIVER_MODESET);
-	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, drm);
-
-	nfourccs_out = drm_fb_build_fourcc_list(drm, params->native_fourccs,
-						params->native_fourccs_size,
-						fourccs_out, TEST_BUF_SIZE);
-
-	KUNIT_EXPECT_EQ(test, nfourccs_out, params->expected_fourccs_size);
-	KUNIT_EXPECT_MEMEQ(test, fourccs_out, params->expected, TEST_BUF_SIZE);
-}
-
 struct fb_memcpy_case {
 	const char *name;
 	u32 format;
@@ -1864,7 +1723,6 @@ static struct kunit_case drm_format_helper_test_cases[] = {
 	KUNIT_CASE_PARAM(drm_test_fb_xrgb8888_to_xbgr8888, convert_xrgb8888_gen_params),
 	KUNIT_CASE_PARAM(drm_test_fb_xrgb8888_to_abgr8888, convert_xrgb8888_gen_params),
 	KUNIT_CASE_PARAM(drm_test_fb_clip_offset, clip_offset_gen_params),
-	KUNIT_CASE_PARAM(drm_test_fb_build_fourcc_list, fb_build_fourcc_list_gen_params),
 	KUNIT_CASE_PARAM(drm_test_fb_memcpy, fb_memcpy_gen_params),
 	{}
 };
diff --git a/drivers/gpu/drm/tests/drm_sysfb_modeset_test.c b/drivers/gpu/drm/tests/drm_sysfb_modeset_test.c
new file mode 100644
index 000000000000..5104fb21c6bc
--- /dev/null
+++ b/drivers/gpu/drm/tests/drm_sysfb_modeset_test.c
@@ -0,0 +1,166 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <kunit/test.h>
+
+#include <drm/drm_format_helper.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_kunit_helpers.h>
+
+#define TEST_BUF_SIZE 50
+
+struct fb_build_fourcc_list_case {
+	const char *name;
+	u32 native_fourccs[TEST_BUF_SIZE];
+	size_t native_fourccs_size;
+	u32 expected[TEST_BUF_SIZE];
+	size_t expected_fourccs_size;
+};
+
+static struct fb_build_fourcc_list_case fb_build_fourcc_list_cases[] = {
+	{
+		.name = "no native formats",
+		.native_fourccs = { },
+		.native_fourccs_size = 0,
+		.expected = { DRM_FORMAT_XRGB8888 },
+		.expected_fourccs_size = 1,
+	},
+	{
+		.name = "XRGB8888 as native format",
+		.native_fourccs = { DRM_FORMAT_XRGB8888 },
+		.native_fourccs_size = 1,
+		.expected = { DRM_FORMAT_XRGB8888 },
+		.expected_fourccs_size = 1,
+	},
+	{
+		.name = "remove duplicates",
+		.native_fourccs = {
+			DRM_FORMAT_XRGB8888,
+			DRM_FORMAT_XRGB8888,
+			DRM_FORMAT_RGB888,
+			DRM_FORMAT_RGB888,
+			DRM_FORMAT_RGB888,
+			DRM_FORMAT_XRGB8888,
+			DRM_FORMAT_RGB888,
+			DRM_FORMAT_RGB565,
+			DRM_FORMAT_RGB888,
+			DRM_FORMAT_XRGB8888,
+			DRM_FORMAT_RGB565,
+			DRM_FORMAT_RGB565,
+			DRM_FORMAT_XRGB8888,
+		},
+		.native_fourccs_size = 11,
+		.expected = {
+			DRM_FORMAT_XRGB8888,
+			DRM_FORMAT_RGB888,
+			DRM_FORMAT_RGB565,
+		},
+		.expected_fourccs_size = 3,
+	},
+	{
+		.name = "convert alpha formats",
+		.native_fourccs = {
+			DRM_FORMAT_ARGB1555,
+			DRM_FORMAT_ABGR1555,
+			DRM_FORMAT_RGBA5551,
+			DRM_FORMAT_BGRA5551,
+			DRM_FORMAT_ARGB8888,
+			DRM_FORMAT_ABGR8888,
+			DRM_FORMAT_RGBA8888,
+			DRM_FORMAT_BGRA8888,
+			DRM_FORMAT_ARGB2101010,
+			DRM_FORMAT_ABGR2101010,
+			DRM_FORMAT_RGBA1010102,
+			DRM_FORMAT_BGRA1010102,
+		},
+		.native_fourccs_size = 12,
+		.expected = {
+			DRM_FORMAT_XRGB1555,
+			DRM_FORMAT_XBGR1555,
+			DRM_FORMAT_RGBX5551,
+			DRM_FORMAT_BGRX5551,
+			DRM_FORMAT_XRGB8888,
+			DRM_FORMAT_XBGR8888,
+			DRM_FORMAT_RGBX8888,
+			DRM_FORMAT_BGRX8888,
+			DRM_FORMAT_XRGB2101010,
+			DRM_FORMAT_XBGR2101010,
+			DRM_FORMAT_RGBX1010102,
+			DRM_FORMAT_BGRX1010102,
+		},
+		.expected_fourccs_size = 12,
+	},
+	{
+		.name = "random formats",
+		.native_fourccs = {
+			DRM_FORMAT_Y212,
+			DRM_FORMAT_ARGB1555,
+			DRM_FORMAT_ABGR16161616F,
+			DRM_FORMAT_C8,
+			DRM_FORMAT_BGR888,
+			DRM_FORMAT_XRGB1555,
+			DRM_FORMAT_RGBA5551,
+			DRM_FORMAT_BGR565_A8,
+			DRM_FORMAT_R10,
+			DRM_FORMAT_XYUV8888,
+		},
+		.native_fourccs_size = 10,
+		.expected = {
+			DRM_FORMAT_Y212,
+			DRM_FORMAT_XRGB1555,
+			DRM_FORMAT_ABGR16161616F,
+			DRM_FORMAT_C8,
+			DRM_FORMAT_BGR888,
+			DRM_FORMAT_RGBX5551,
+			DRM_FORMAT_BGR565_A8,
+			DRM_FORMAT_R10,
+			DRM_FORMAT_XYUV8888,
+			DRM_FORMAT_XRGB8888,
+		},
+		.expected_fourccs_size = 10,
+	},
+};
+
+static void fb_build_fourcc_list_case_desc(struct fb_build_fourcc_list_case *t, char *desc)
+{
+	strscpy(desc, t->name, KUNIT_PARAM_DESC_SIZE);
+}
+
+KUNIT_ARRAY_PARAM(fb_build_fourcc_list, fb_build_fourcc_list_cases, fb_build_fourcc_list_case_desc);
+
+static void drm_test_fb_build_fourcc_list(struct kunit *test)
+{
+	const struct fb_build_fourcc_list_case *params = test->param_value;
+	u32 fourccs_out[TEST_BUF_SIZE] = {0};
+	size_t nfourccs_out;
+	struct drm_device *drm;
+	struct device *dev;
+
+	dev = drm_kunit_helper_alloc_device(test);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, dev);
+
+	drm = __drm_kunit_helper_alloc_drm_device(test, dev, sizeof(*drm), 0, DRIVER_MODESET);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, drm);
+
+	nfourccs_out = drm_fb_build_fourcc_list(drm, params->native_fourccs,
+						params->native_fourccs_size,
+						fourccs_out, TEST_BUF_SIZE);
+
+	KUNIT_EXPECT_EQ(test, nfourccs_out, params->expected_fourccs_size);
+	KUNIT_EXPECT_MEMEQ(test, fourccs_out, params->expected, TEST_BUF_SIZE);
+}
+
+static struct kunit_case drm_sysfb_modeset_test_cases[] = {
+	KUNIT_CASE_PARAM(drm_test_fb_build_fourcc_list, fb_build_fourcc_list_gen_params),
+	{}
+};
+
+static struct kunit_suite drm_sysfb_modeset_test_suite = {
+	.name = "drm_sysfb_modeset_test",
+	.test_cases = drm_sysfb_modeset_test_cases,
+};
+
+kunit_test_suite(drm_sysfb_modeset_test_suite);
+
+MODULE_DESCRIPTION("KUnit tests for the drm_sysfb_modeset APIs");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("José Expósito <jose.exposito89@gmail.com>");
-- 
2.49.0

[PATCH v3 3/3] drm/format-helper: Move drm_fb_build_fourcc_list() to sysfb helpers

[Thomas Zimmermann]

Only sysfb drivers use drm_fb_build_fourcc_list(). Move the function
to sysfb helpers and rename it accordingly. Update drivers and tests.

v3:
- update naming in tests
v2:
- select DRM_SYSFB_HELPER (kernel test robot)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: José Expósito <jose.exposito89@gmail.com>
Acked-by: Maxime Ripard <mripard@kernel.org>
Acked-by: Javier Martinez Canillas <javierm@redhat.com>
---
 drivers/gpu/drm/Kconfig.debug                 |   1 +
 drivers/gpu/drm/drm_format_helper.c           | 138 ------------------
 drivers/gpu/drm/sysfb/drm_sysfb_helper.h      |   4 +
 drivers/gpu/drm/sysfb/drm_sysfb_modeset.c     | 138 ++++++++++++++++++
 drivers/gpu/drm/sysfb/efidrm.c                |   4 +-
 drivers/gpu/drm/sysfb/ofdrm.c                 |   5 +-
 drivers/gpu/drm/sysfb/simpledrm.c             |   5 +-
 drivers/gpu/drm/sysfb/vesadrm.c               |   4 +-
 .../gpu/drm/tests/drm_sysfb_modeset_test.c    |  24 +--
 include/drm/drm_format_helper.h               |   4 -
 10 files changed, 164 insertions(+), 163 deletions(-)

diff --git a/drivers/gpu/drm/Kconfig.debug b/drivers/gpu/drm/Kconfig.debug
index fa6ee76f4d3c..05dc43c0b8c5 100644
--- a/drivers/gpu/drm/Kconfig.debug
+++ b/drivers/gpu/drm/Kconfig.debug
@@ -70,6 +70,7 @@ config DRM_KUNIT_TEST
 	select DRM_GEM_SHMEM_HELPER
 	select DRM_KUNIT_TEST_HELPERS
 	select DRM_LIB_RANDOM
+	select DRM_SYSFB_HELPER
 	select PRIME_NUMBERS
 	default KUNIT_ALL_TESTS
 	help
diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c
index 63dc46f9fc49..99d9f7bbc261 100644
--- a/drivers/gpu/drm/drm_format_helper.c
+++ b/drivers/gpu/drm/drm_format_helper.c
@@ -1339,141 +1339,3 @@ void drm_fb_xrgb8888_to_mono(struct iosys_map *dst, const unsigned int *dst_pitc
 	}
 }
 EXPORT_SYMBOL(drm_fb_xrgb8888_to_mono);
-
-static uint32_t drm_fb_nonalpha_fourcc(uint32_t fourcc)
-{
-	/* only handle formats with depth != 0 and alpha channel */
-	switch (fourcc) {
-	case DRM_FORMAT_ARGB1555:
-		return DRM_FORMAT_XRGB1555;
-	case DRM_FORMAT_ABGR1555:
-		return DRM_FORMAT_XBGR1555;
-	case DRM_FORMAT_RGBA5551:
-		return DRM_FORMAT_RGBX5551;
-	case DRM_FORMAT_BGRA5551:
-		return DRM_FORMAT_BGRX5551;
-	case DRM_FORMAT_ARGB8888:
-		return DRM_FORMAT_XRGB8888;
-	case DRM_FORMAT_ABGR8888:
-		return DRM_FORMAT_XBGR8888;
-	case DRM_FORMAT_RGBA8888:
-		return DRM_FORMAT_RGBX8888;
-	case DRM_FORMAT_BGRA8888:
-		return DRM_FORMAT_BGRX8888;
-	case DRM_FORMAT_ARGB2101010:
-		return DRM_FORMAT_XRGB2101010;
-	case DRM_FORMAT_ABGR2101010:
-		return DRM_FORMAT_XBGR2101010;
-	case DRM_FORMAT_RGBA1010102:
-		return DRM_FORMAT_RGBX1010102;
-	case DRM_FORMAT_BGRA1010102:
-		return DRM_FORMAT_BGRX1010102;
-	}
-
-	return fourcc;
-}
-
-static bool is_listed_fourcc(const uint32_t *fourccs, size_t nfourccs, uint32_t fourcc)
-{
-	const uint32_t *fourccs_end = fourccs + nfourccs;
-
-	while (fourccs < fourccs_end) {
-		if (*fourccs == fourcc)
-			return true;
-		++fourccs;
-	}
-	return false;
-}
-
-/**
- * drm_fb_build_fourcc_list - Filters a list of supported color formats against
- *                            the device's native formats
- * @dev: DRM device
- * @native_fourccs: 4CC codes of natively supported color formats
- * @native_nfourccs: The number of entries in @native_fourccs
- * @fourccs_out: Returns 4CC codes of supported color formats
- * @nfourccs_out: The number of available entries in @fourccs_out
- *
- * This function create a list of supported color format from natively
- * supported formats and additional emulated formats.
- * At a minimum, most userspace programs expect at least support for
- * XRGB8888 on the primary plane. Devices that have to emulate the
- * format, and possibly others, can use drm_fb_build_fourcc_list() to
- * create a list of supported color formats. The returned list can
- * be handed over to drm_universal_plane_init() et al. Native formats
- * will go before emulated formats. Native formats with alpha channel
- * will be replaced by such without, as primary planes usually don't
- * support alpha. Other heuristics might be applied
- * to optimize the order. Formats near the beginning of the list are
- * usually preferred over formats near the end of the list.
- *
- * Returns:
- * The number of color-formats 4CC codes returned in @fourccs_out.
- */
-size_t drm_fb_build_fourcc_list(struct drm_device *dev,
-				const u32 *native_fourccs, size_t native_nfourccs,
-				u32 *fourccs_out, size_t nfourccs_out)
-{
-	/*
-	 * XRGB8888 is the default fallback format for most of userspace
-	 * and it's currently the only format that should be emulated for
-	 * the primary plane. Only if there's ever another default fallback,
-	 * it should be added here.
-	 */
-	static const uint32_t extra_fourccs[] = {
-		DRM_FORMAT_XRGB8888,
-	};
-	static const size_t extra_nfourccs = ARRAY_SIZE(extra_fourccs);
-
-	u32 *fourccs = fourccs_out;
-	const u32 *fourccs_end = fourccs_out + nfourccs_out;
-	size_t i;
-
-	/*
-	 * The device's native formats go first.
-	 */
-
-	for (i = 0; i < native_nfourccs; ++i) {
-		/*
-		 * Several DTs, boot loaders and firmware report native
-		 * alpha formats that are non-alpha formats instead. So
-		 * replace alpha formats by non-alpha formats.
-		 */
-		u32 fourcc = drm_fb_nonalpha_fourcc(native_fourccs[i]);
-
-		if (is_listed_fourcc(fourccs_out, fourccs - fourccs_out, fourcc)) {
-			continue; /* skip duplicate entries */
-		} else if (fourccs == fourccs_end) {
-			drm_warn(dev, "Ignoring native format %p4cc\n", &fourcc);
-			continue; /* end of available output buffer */
-		}
-
-		drm_dbg_kms(dev, "adding native format %p4cc\n", &fourcc);
-
-		*fourccs = fourcc;
-		++fourccs;
-	}
-
-	/*
-	 * The extra formats, emulated by the driver, go second.
-	 */
-
-	for (i = 0; (i < extra_nfourccs) && (fourccs < fourccs_end); ++i) {
-		u32 fourcc = extra_fourccs[i];
-
-		if (is_listed_fourcc(fourccs_out, fourccs - fourccs_out, fourcc)) {
-			continue; /* skip duplicate and native entries */
-		} else if (fourccs == fourccs_end) {
-			drm_warn(dev, "Ignoring emulated format %p4cc\n", &fourcc);
-			continue; /* end of available output buffer */
-		}
-
-		drm_dbg_kms(dev, "adding emulated format %p4cc\n", &fourcc);
-
-		*fourccs = fourcc;
-		++fourccs;
-	}
-
-	return fourccs - fourccs_out;
-}
-EXPORT_SYMBOL(drm_fb_build_fourcc_list);
diff --git a/drivers/gpu/drm/sysfb/drm_sysfb_helper.h b/drivers/gpu/drm/sysfb/drm_sysfb_helper.h
index cb08a88242cc..1424b63dde99 100644
--- a/drivers/gpu/drm/sysfb/drm_sysfb_helper.h
+++ b/drivers/gpu/drm/sysfb/drm_sysfb_helper.h
@@ -93,6 +93,10 @@ static inline struct drm_sysfb_device *to_drm_sysfb_device(struct drm_device *de
  * Plane
  */
 
+size_t drm_sysfb_build_fourcc_list(struct drm_device *dev,
+				   const u32 *native_fourccs, size_t native_nfourccs,
+				   u32 *fourccs_out, size_t nfourccs_out);
+
 int drm_sysfb_plane_helper_atomic_check(struct drm_plane *plane,
 					struct drm_atomic_state *new_state);
 void drm_sysfb_plane_helper_atomic_update(struct drm_plane *plane,
diff --git a/drivers/gpu/drm/sysfb/drm_sysfb_modeset.c b/drivers/gpu/drm/sysfb/drm_sysfb_modeset.c
index ffaa2522ab96..1bcdb5ee8f09 100644
--- a/drivers/gpu/drm/sysfb/drm_sysfb_modeset.c
+++ b/drivers/gpu/drm/sysfb/drm_sysfb_modeset.c
@@ -47,6 +47,144 @@ EXPORT_SYMBOL(drm_sysfb_mode);
  * Plane
  */
 
+static u32 to_nonalpha_fourcc(u32 fourcc)
+{
+	/* only handle formats with depth != 0 and alpha channel */
+	switch (fourcc) {
+	case DRM_FORMAT_ARGB1555:
+		return DRM_FORMAT_XRGB1555;
+	case DRM_FORMAT_ABGR1555:
+		return DRM_FORMAT_XBGR1555;
+	case DRM_FORMAT_RGBA5551:
+		return DRM_FORMAT_RGBX5551;
+	case DRM_FORMAT_BGRA5551:
+		return DRM_FORMAT_BGRX5551;
+	case DRM_FORMAT_ARGB8888:
+		return DRM_FORMAT_XRGB8888;
+	case DRM_FORMAT_ABGR8888:
+		return DRM_FORMAT_XBGR8888;
+	case DRM_FORMAT_RGBA8888:
+		return DRM_FORMAT_RGBX8888;
+	case DRM_FORMAT_BGRA8888:
+		return DRM_FORMAT_BGRX8888;
+	case DRM_FORMAT_ARGB2101010:
+		return DRM_FORMAT_XRGB2101010;
+	case DRM_FORMAT_ABGR2101010:
+		return DRM_FORMAT_XBGR2101010;
+	case DRM_FORMAT_RGBA1010102:
+		return DRM_FORMAT_RGBX1010102;
+	case DRM_FORMAT_BGRA1010102:
+		return DRM_FORMAT_BGRX1010102;
+	}
+
+	return fourcc;
+}
+
+static bool is_listed_fourcc(const u32 *fourccs, size_t nfourccs, u32 fourcc)
+{
+	const u32 *fourccs_end = fourccs + nfourccs;
+
+	while (fourccs < fourccs_end) {
+		if (*fourccs == fourcc)
+			return true;
+		++fourccs;
+	}
+	return false;
+}
+
+/**
+ * drm_sysfb_build_fourcc_list - Filters a list of supported color formats against
+ *                               the device's native formats
+ * @dev: DRM device
+ * @native_fourccs: 4CC codes of natively supported color formats
+ * @native_nfourccs: The number of entries in @native_fourccs
+ * @fourccs_out: Returns 4CC codes of supported color formats
+ * @nfourccs_out: The number of available entries in @fourccs_out
+ *
+ * This function create a list of supported color format from natively
+ * supported formats and additional emulated formats.
+ * At a minimum, most userspace programs expect at least support for
+ * XRGB8888 on the primary plane. Sysfb devices that have to emulate
+ * the format should use drm_sysfb_build_fourcc_list() to create a list
+ * of supported color formats. The returned list can be handed over to
+ * drm_universal_plane_init() et al. Native formats will go before
+ * emulated formats. Native formats with alpha channel will be replaced
+ * by equal formats without alpha channel, as primary planes usually
+ * don't support alpha. Other heuristics might be applied to optimize
+ * the sorting order. Formats near the beginning of the list are usually
+ * preferred over formats near the end of the list.
+ *
+ * Returns:
+ * The number of color-formats 4CC codes returned in @fourccs_out.
+ */
+size_t drm_sysfb_build_fourcc_list(struct drm_device *dev,
+				   const u32 *native_fourccs, size_t native_nfourccs,
+				   u32 *fourccs_out, size_t nfourccs_out)
+{
+	/*
+	 * XRGB8888 is the default fallback format for most of userspace
+	 * and it's currently the only format that should be emulated for
+	 * the primary plane. Only if there's ever another default fallback,
+	 * it should be added here.
+	 */
+	static const u32 extra_fourccs[] = {
+		DRM_FORMAT_XRGB8888,
+	};
+	static const size_t extra_nfourccs = ARRAY_SIZE(extra_fourccs);
+
+	u32 *fourccs = fourccs_out;
+	const u32 *fourccs_end = fourccs_out + nfourccs_out;
+	size_t i;
+
+	/*
+	 * The device's native formats go first.
+	 */
+
+	for (i = 0; i < native_nfourccs; ++i) {
+		/*
+		 * Several DTs, boot loaders and firmware report native
+		 * alpha formats that are non-alpha formats instead. So
+		 * replace alpha formats by non-alpha formats.
+		 */
+		u32 fourcc = to_nonalpha_fourcc(native_fourccs[i]);
+
+		if (is_listed_fourcc(fourccs_out, fourccs - fourccs_out, fourcc)) {
+			continue; /* skip duplicate entries */
+		} else if (fourccs == fourccs_end) {
+			drm_warn(dev, "Ignoring native format %p4cc\n", &fourcc);
+			continue; /* end of available output buffer */
+		}
+
+		drm_dbg_kms(dev, "adding native format %p4cc\n", &fourcc);
+
+		*fourccs = fourcc;
+		++fourccs;
+	}
+
+	/*
+	 * The extra formats, emulated by the driver, go second.
+	 */
+
+	for (i = 0; (i < extra_nfourccs) && (fourccs < fourccs_end); ++i) {
+		u32 fourcc = extra_fourccs[i];
+
+		if (is_listed_fourcc(fourccs_out, fourccs - fourccs_out, fourcc)) {
+			continue; /* skip duplicate and native entries */
+		} else if (fourccs == fourccs_end) {
+			drm_warn(dev, "Ignoring emulated format %p4cc\n", &fourcc);
+			continue; /* end of available output buffer */
+		}
+
+		drm_dbg_kms(dev, "adding emulated format %p4cc\n", &fourcc);
+
+		*fourccs = fourcc;
+		++fourccs;
+	}
+
+	return fourccs - fourccs_out;
+}
+EXPORT_SYMBOL(drm_sysfb_build_fourcc_list);
+
 int drm_sysfb_plane_helper_atomic_check(struct drm_plane *plane,
 					struct drm_atomic_state *new_state)
 {
diff --git a/drivers/gpu/drm/sysfb/efidrm.c b/drivers/gpu/drm/sysfb/efidrm.c
index 46912924636a..9562f9dc7835 100644
--- a/drivers/gpu/drm/sysfb/efidrm.c
+++ b/drivers/gpu/drm/sysfb/efidrm.c
@@ -271,8 +271,8 @@ static struct efidrm_device *efidrm_device_create(struct drm_driver *drv,
 
 	/* Primary plane */
 
-	nformats = drm_fb_build_fourcc_list(dev, &format->format, 1,
-					    efi->formats, ARRAY_SIZE(efi->formats));
+	nformats = drm_sysfb_build_fourcc_list(dev, &format->format, 1,
+					       efi->formats, ARRAY_SIZE(efi->formats));
 
 	primary_plane = &efi->primary_plane;
 	ret = drm_universal_plane_init(dev, primary_plane, 0, &efidrm_primary_plane_funcs,
diff --git a/drivers/gpu/drm/sysfb/ofdrm.c b/drivers/gpu/drm/sysfb/ofdrm.c
index c9415f0cb3ed..8d8ab39c5f36 100644
--- a/drivers/gpu/drm/sysfb/ofdrm.c
+++ b/drivers/gpu/drm/sysfb/ofdrm.c
@@ -15,7 +15,6 @@
 #include <drm/drm_drv.h>
 #include <drm/drm_edid.h>
 #include <drm/drm_fbdev_shmem.h>
-#include <drm/drm_format_helper.h>
 #include <drm/drm_framebuffer.h>
 #include <drm/drm_gem_atomic_helper.h>
 #include <drm/drm_gem_framebuffer_helper.h>
@@ -1015,8 +1014,8 @@ static struct ofdrm_device *ofdrm_device_create(struct drm_driver *drv,
 
 	/* Primary plane */
 
-	nformats = drm_fb_build_fourcc_list(dev, &format->format, 1,
-					    odev->formats, ARRAY_SIZE(odev->formats));
+	nformats = drm_sysfb_build_fourcc_list(dev, &format->format, 1,
+					       odev->formats, ARRAY_SIZE(odev->formats));
 
 	primary_plane = &odev->primary_plane;
 	ret = drm_universal_plane_init(dev, primary_plane, 0, &ofdrm_primary_plane_funcs,
diff --git a/drivers/gpu/drm/sysfb/simpledrm.c b/drivers/gpu/drm/sysfb/simpledrm.c
index a1c3119330de..8530a3ef8a7a 100644
--- a/drivers/gpu/drm/sysfb/simpledrm.c
+++ b/drivers/gpu/drm/sysfb/simpledrm.c
@@ -18,7 +18,6 @@
 #include <drm/drm_device.h>
 #include <drm/drm_drv.h>
 #include <drm/drm_fbdev_shmem.h>
-#include <drm/drm_format_helper.h>
 #include <drm/drm_framebuffer.h>
 #include <drm/drm_gem_atomic_helper.h>
 #include <drm/drm_gem_framebuffer_helper.h>
@@ -765,8 +764,8 @@ static struct simpledrm_device *simpledrm_device_create(struct drm_driver *drv,
 
 	/* Primary plane */
 
-	nformats = drm_fb_build_fourcc_list(dev, &format->format, 1,
-					    sdev->formats, ARRAY_SIZE(sdev->formats));
+	nformats = drm_sysfb_build_fourcc_list(dev, &format->format, 1,
+					       sdev->formats, ARRAY_SIZE(sdev->formats));
 
 	primary_plane = &sdev->primary_plane;
 	ret = drm_universal_plane_init(dev, primary_plane, 0, &simpledrm_primary_plane_funcs,
diff --git a/drivers/gpu/drm/sysfb/vesadrm.c b/drivers/gpu/drm/sysfb/vesadrm.c
index 7945544ba73e..86e0b88dd51b 100644
--- a/drivers/gpu/drm/sysfb/vesadrm.c
+++ b/drivers/gpu/drm/sysfb/vesadrm.c
@@ -402,8 +402,8 @@ static struct vesadrm_device *vesadrm_device_create(struct drm_driver *drv,
 
 	/* Primary plane */
 
-	nformats = drm_fb_build_fourcc_list(dev, &format->format, 1,
-					    vesa->formats, ARRAY_SIZE(vesa->formats));
+	nformats = drm_sysfb_build_fourcc_list(dev, &format->format, 1,
+					       vesa->formats, ARRAY_SIZE(vesa->formats));
 
 	primary_plane = &vesa->primary_plane;
 	ret = drm_universal_plane_init(dev, primary_plane, 0, &vesadrm_primary_plane_funcs,
diff --git a/drivers/gpu/drm/tests/drm_sysfb_modeset_test.c b/drivers/gpu/drm/tests/drm_sysfb_modeset_test.c
index 5104fb21c6bc..e875d876118f 100644
--- a/drivers/gpu/drm/tests/drm_sysfb_modeset_test.c
+++ b/drivers/gpu/drm/tests/drm_sysfb_modeset_test.c
@@ -2,13 +2,14 @@
 
 #include <kunit/test.h>
 
-#include <drm/drm_format_helper.h>
 #include <drm/drm_fourcc.h>
 #include <drm/drm_kunit_helpers.h>
 
+#include "../sysfb/drm_sysfb_helper.h"
+
 #define TEST_BUF_SIZE 50
 
-struct fb_build_fourcc_list_case {
+struct sysfb_build_fourcc_list_case {
 	const char *name;
 	u32 native_fourccs[TEST_BUF_SIZE];
 	size_t native_fourccs_size;
@@ -16,7 +17,7 @@ struct fb_build_fourcc_list_case {
 	size_t expected_fourccs_size;
 };
 
-static struct fb_build_fourcc_list_case fb_build_fourcc_list_cases[] = {
+static struct sysfb_build_fourcc_list_case sysfb_build_fourcc_list_cases[] = {
 	{
 		.name = "no native formats",
 		.native_fourccs = { },
@@ -120,16 +121,17 @@ static struct fb_build_fourcc_list_case fb_build_fourcc_list_cases[] = {
 	},
 };
 
-static void fb_build_fourcc_list_case_desc(struct fb_build_fourcc_list_case *t, char *desc)
+static void sysfb_build_fourcc_list_case_desc(struct sysfb_build_fourcc_list_case *t, char *desc)
 {
 	strscpy(desc, t->name, KUNIT_PARAM_DESC_SIZE);
 }
 
-KUNIT_ARRAY_PARAM(fb_build_fourcc_list, fb_build_fourcc_list_cases, fb_build_fourcc_list_case_desc);
+KUNIT_ARRAY_PARAM(sysfb_build_fourcc_list, sysfb_build_fourcc_list_cases,
+		  sysfb_build_fourcc_list_case_desc);
 
-static void drm_test_fb_build_fourcc_list(struct kunit *test)
+static void drm_test_sysfb_build_fourcc_list(struct kunit *test)
 {
-	const struct fb_build_fourcc_list_case *params = test->param_value;
+	const struct sysfb_build_fourcc_list_case *params = test->param_value;
 	u32 fourccs_out[TEST_BUF_SIZE] = {0};
 	size_t nfourccs_out;
 	struct drm_device *drm;
@@ -141,16 +143,16 @@ static void drm_test_fb_build_fourcc_list(struct kunit *test)
 	drm = __drm_kunit_helper_alloc_drm_device(test, dev, sizeof(*drm), 0, DRIVER_MODESET);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, drm);
 
-	nfourccs_out = drm_fb_build_fourcc_list(drm, params->native_fourccs,
-						params->native_fourccs_size,
-						fourccs_out, TEST_BUF_SIZE);
+	nfourccs_out = drm_sysfb_build_fourcc_list(drm, params->native_fourccs,
+						   params->native_fourccs_size,
+						   fourccs_out, TEST_BUF_SIZE);
 
 	KUNIT_EXPECT_EQ(test, nfourccs_out, params->expected_fourccs_size);
 	KUNIT_EXPECT_MEMEQ(test, fourccs_out, params->expected, TEST_BUF_SIZE);
 }
 
 static struct kunit_case drm_sysfb_modeset_test_cases[] = {
-	KUNIT_CASE_PARAM(drm_test_fb_build_fourcc_list, fb_build_fourcc_list_gen_params),
+	KUNIT_CASE_PARAM(drm_test_sysfb_build_fourcc_list, sysfb_build_fourcc_list_gen_params),
 	{}
 };
 
diff --git a/include/drm/drm_format_helper.h b/include/drm/drm_format_helper.h
index 49a2e09155d1..0d3ee2a1313f 100644
--- a/include/drm/drm_format_helper.h
+++ b/include/drm/drm_format_helper.h
@@ -134,8 +134,4 @@ void drm_fb_xrgb8888_to_mono(struct iosys_map *dst, const unsigned int *dst_pitc
 			     const struct iosys_map *src, const struct drm_framebuffer *fb,
 			     const struct drm_rect *clip, struct drm_format_conv_state *state);
 
-size_t drm_fb_build_fourcc_list(struct drm_device *dev,
-				const u32 *native_fourccs, size_t native_nfourccs,
-				u32 *fourccs_out, size_t nfourccs_out);
-
 #endif /* __LINUX_DRM_FORMAT_HELPER_H */
-- 
2.49.0