[PATCH v3 0/3] drm/panel: novatek-nt35560: Fix bug and clean up

[PATCH v3 0/3] drm/panel: novatek-nt35560: Fix bug and clean up

[Brigham Campbell]

Fix bug in novatek-nt35560 driver's nt35560_set_brightness() which
causes the driver to incorrectly report that it "failed to disable
display backlight".

Add mipi_dsi_dcs_read_multi() to drm_mipi_dsi.c for improved error
handling in drivers which use mipi_dsi_dcs_read() multiple times in a
row. Add mipi_dsi_dcs_write_var_seq_multi() and
mipi_dsi_generic_write_var_seq_multi() to drm_mipi_dsi.h to allow
drivers to more conveniently construct MIPI payloads at runtime.

Clean up novatek-nt35560 driver to use "multi" variants of MIPI.

Changes to v3:
 - Fix incorrect Fixes tag. The bug was introduced by an earlier commit.
 - Minor formatting improvements.

Changes to v2:
 - Separate bug fix into its own commit for backporting.
 - Add var_seq_multi() variants of MIPI write macros for sending
   non-static MIPI messages.
 - Minor formatting improvements.

Brigham Campbell (3):
  drm/panel: novatek-nt35560: Fix invalid return value
  drm: Add MIPI read_multi func and two write macros
  drm/panel: novatek-nt35560: Clean up driver

 drivers/gpu/drm/drm_mipi_dsi.c                |  37 ++++
 drivers/gpu/drm/panel/panel-novatek-nt35560.c | 198 ++++++------------
 include/drm/drm_mipi_dsi.h                    |  35 ++++
 3 files changed, 132 insertions(+), 138 deletions(-)


base-commit: 33f8f321e7aa7715ce19560801ee5223ba8b9a7d
-- 
2.50.1

[PATCH v3 1/3] drm/panel: novatek-nt35560: Fix invalid return value

[Brigham Campbell]

Fix bug in nt35560_set_brightness() which causes the function to
erroneously report an error. mipi_dsi_dcs_write() returns either a
negative value when an error occurred or a positive number of bytes
written when no error occurred. The buggy code reports an error under
either condition.

Fixes: 8152c2bfd780 ("drm/panel: Add driver for Sony ACX424AKP panel")
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Brigham Campbell <me@brighamcampbell.com>
---
 drivers/gpu/drm/panel/panel-novatek-nt35560.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panel/panel-novatek-nt35560.c b/drivers/gpu/drm/panel/panel-novatek-nt35560.c
index 98f0782c8411..17898a29efe8 100644
--- a/drivers/gpu/drm/panel/panel-novatek-nt35560.c
+++ b/drivers/gpu/drm/panel/panel-novatek-nt35560.c
@@ -161,7 +161,7 @@ static int nt35560_set_brightness(struct backlight_device *bl)
 		par = 0x00;
 		ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY,
 					 &par, 1);
-		if (ret) {
+		if (ret < 0) {
 			dev_err(nt->dev, "failed to disable display backlight (%d)\n", ret);
 			return ret;
 		}
-- 
2.50.1

[PATCH v3 2/3] drm: Add MIPI read_multi func and two write macros

[Brigham Campbell]

Create mipi_dsi_dcs_read_multi(), which accepts a mipi_dsi_multi_context
struct for improved error handling and cleaner panel driver code.

Create mipi_dsi_dcs_write_var_seq_multi() and
mipi_dsi_generic_write_var_seq_multi() macros which allow MIPI panel
drivers to write non-static data to display controllers.

Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Brigham Campbell <me@brighamcampbell.com>
---

Doug, you had suggested a slightly different shortlog for this patch. I
adjusted your suggestion to fit within the canonical recommended
shortlog length of 50 characters. I understand that the 50 character
limit isn't a rule as much as it is a guideline, but the current
shortlog seems to me like a good compromise.

 drivers/gpu/drm/drm_mipi_dsi.c | 37 ++++++++++++++++++++++++++++++++++
 include/drm/drm_mipi_dsi.h     | 35 ++++++++++++++++++++++++++++++++
 2 files changed, 72 insertions(+)

diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
index a00d76443128..0f2c3be98212 100644
--- a/drivers/gpu/drm/drm_mipi_dsi.c
+++ b/drivers/gpu/drm/drm_mipi_dsi.c
@@ -1075,6 +1075,43 @@ ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data,
 }
 EXPORT_SYMBOL(mipi_dsi_dcs_read);
 
+/**
+ * mipi_dsi_dcs_read_multi() - mipi_dsi_dcs_read() w/ accum_err
+ * @ctx: Context for multiple DSI transactions
+ * @cmd: DCS command
+ * @data: buffer in which to receive data
+ * @len: size of receive buffer
+ *
+ * Like mipi_dsi_dcs_read() but deals with errors in a way that makes it
+ * convenient to make several calls in a row.
+ */
+void mipi_dsi_dcs_read_multi(struct mipi_dsi_multi_context *ctx, u8 cmd,
+			     void *data, size_t len)
+{
+	struct mipi_dsi_device *dsi = ctx->dsi;
+	struct device *dev = &dsi->dev;
+	struct mipi_dsi_msg msg = {
+		.channel = dsi->channel,
+		.type = MIPI_DSI_DCS_READ,
+		.tx_buf = &cmd,
+		.tx_len = 1,
+		.rx_buf = data,
+		.rx_len = len
+	};
+	ssize_t ret;
+
+	if (ctx->accum_err)
+		return;
+
+	ret = mipi_dsi_device_transfer(dsi, &msg);
+	if (ret < 0) {
+		ctx->accum_err = ret;
+		dev_err(dev, "dcs read with command %#x failed: %d\n", cmd,
+			ctx->accum_err);
+	}
+}
+EXPORT_SYMBOL(mipi_dsi_dcs_read_multi);
+
 /**
  * mipi_dsi_dcs_nop() - send DCS nop packet
  * @dsi: DSI peripheral device
diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
index 369b0d8830c3..296ffdc9cd02 100644
--- a/include/drm/drm_mipi_dsi.h
+++ b/include/drm/drm_mipi_dsi.h
@@ -333,6 +333,8 @@ ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, u8 cmd,
 			   const void *data, size_t len);
 ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data,
 			  size_t len);
+void mipi_dsi_dcs_read_multi(struct mipi_dsi_multi_context *ctx, u8 cmd,
+			     void *data, size_t len);
 int mipi_dsi_dcs_nop(struct mipi_dsi_device *dsi);
 int mipi_dsi_dcs_soft_reset(struct mipi_dsi_device *dsi);
 int mipi_dsi_dcs_get_power_mode(struct mipi_dsi_device *dsi, u8 *mode);
@@ -415,6 +417,22 @@ void mipi_dsi_dcs_set_tear_off_multi(struct mipi_dsi_multi_context *ctx);
 		mipi_dsi_generic_write_multi(ctx, d, ARRAY_SIZE(d)); \
 	} while (0)
 
+/**
+ * mipi_dsi_generic_write_var_seq_multi - transmit non-constant data using a
+ * generic write packet
+ *
+ * This macro will print errors for you and error handling is optimized for
+ * callers that call this multiple times in a row.
+ *
+ * @ctx: Context for multiple DSI transactions
+ * @seq: buffer containing the payload
+ */
+#define mipi_dsi_generic_write_var_seq_multi(ctx, seq...)	     \
+	do {							     \
+		const u8 d[] = { seq };				     \
+		mipi_dsi_generic_write_multi(ctx, d, ARRAY_SIZE(d)); \
+	} while (0)
+
 /**
  * mipi_dsi_dcs_write_seq_multi - transmit a DCS command with payload
  *
@@ -431,6 +449,23 @@ void mipi_dsi_dcs_set_tear_off_multi(struct mipi_dsi_multi_context *ctx);
 		mipi_dsi_dcs_write_buffer_multi(ctx, d, ARRAY_SIZE(d)); \
 	} while (0)
 
+/**
+ * mipi_dsi_dcs_write_var_seq_multi - transmit a DCS command with non-static
+ * payload
+ *
+ * This macro will print errors for you and error handling is optimized for
+ * callers that call this multiple times in a row.
+ *
+ * @ctx: Context for multiple DSI transactions
+ * @cmd: Command
+ * @seq: buffer containing data to be transmitted
+ */
+#define mipi_dsi_dcs_write_var_seq_multi(ctx, cmd, seq...)		\
+	do {								\
+		const u8 d[] = { cmd, seq };				\
+		mipi_dsi_dcs_write_buffer_multi(ctx, d, ARRAY_SIZE(d));	\
+	} while (0)
+
 /**
  * struct mipi_dsi_driver - DSI driver
  * @driver: device driver model driver
-- 
2.50.1

[PATCH v3 3/3] drm/panel: novatek-nt35560: Clean up driver

[Brigham Campbell]

Update driver to use the "multi" variants of MIPI functions which
facilitate improved error handling and cleaner driver code.

Remove information from a comment which was made obsolete by commit
994ea402c767 ("drm/panel: Rename Sony ACX424 to Novatek NT35560"), which
determined that this driver supports the Novatek NT35560 panel
controller.

Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Brigham Campbell <me@brighamcampbell.com>
---
 drivers/gpu/drm/panel/panel-novatek-nt35560.c | 198 ++++++------------
 1 file changed, 60 insertions(+), 138 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-novatek-nt35560.c b/drivers/gpu/drm/panel/panel-novatek-nt35560.c
index 17898a29efe8..561e6643dcbb 100644
--- a/drivers/gpu/drm/panel/panel-novatek-nt35560.c
+++ b/drivers/gpu/drm/panel/panel-novatek-nt35560.c
@@ -148,24 +148,20 @@ static inline struct nt35560 *panel_to_nt35560(struct drm_panel *panel)
 static int nt35560_set_brightness(struct backlight_device *bl)
 {
 	struct nt35560 *nt = bl_get_data(bl);
-	struct mipi_dsi_device *dsi = to_mipi_dsi_device(nt->dev);
-	int period_ns = 1023;
+	struct mipi_dsi_multi_context dsi_ctx = {
+		.dsi = to_mipi_dsi_device(nt->dev)
+	};
 	int duty_ns = bl->props.brightness;
+	int period_ns = 1023;
 	u8 pwm_ratio;
 	u8 pwm_div;
-	u8 par;
-	int ret;
 
 	if (backlight_is_blank(bl)) {
 		/* Disable backlight */
-		par = 0x00;
-		ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY,
-					 &par, 1);
-		if (ret < 0) {
-			dev_err(nt->dev, "failed to disable display backlight (%d)\n", ret);
-			return ret;
-		}
-		return 0;
+		mipi_dsi_dcs_write_seq_multi(&dsi_ctx,
+					     MIPI_DCS_WRITE_CONTROL_DISPLAY,
+					     0x00);
+		return dsi_ctx.accum_err;
 	}
 
 	/* Calculate the PWM duty cycle in n/256's */
@@ -176,12 +172,6 @@ static int nt35560_set_brightness(struct backlight_device *bl)
 
 	/* Set up PWM dutycycle ONE byte (differs from the standard) */
 	dev_dbg(nt->dev, "calculated duty cycle %02x\n", pwm_ratio);
-	ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
-				 &pwm_ratio, 1);
-	if (ret < 0) {
-		dev_err(nt->dev, "failed to set display PWM ratio (%d)\n", ret);
-		return ret;
-	}
 
 	/*
 	 * Sequence to write PWMDIV:
@@ -192,46 +182,23 @@ static int nt35560_set_brightness(struct backlight_device *bl)
 	 *	0x22		PWMDIV
 	 *	0x7F		0xAA   CMD2 page 1 lock
 	 */
-	par = 0xaa;
-	ret = mipi_dsi_dcs_write(dsi, 0xf3, &par, 1);
-	if (ret < 0) {
-		dev_err(nt->dev, "failed to unlock CMD 2 (%d)\n", ret);
-		return ret;
-	}
-	par = 0x01;
-	ret = mipi_dsi_dcs_write(dsi, 0x00, &par, 1);
-	if (ret < 0) {
-		dev_err(nt->dev, "failed to enter page 1 (%d)\n", ret);
-		return ret;
-	}
-	par = 0x01;
-	ret = mipi_dsi_dcs_write(dsi, 0x7d, &par, 1);
-	if (ret < 0) {
-		dev_err(nt->dev, "failed to disable MTP reload (%d)\n", ret);
-		return ret;
-	}
-	ret = mipi_dsi_dcs_write(dsi, 0x22, &pwm_div, 1);
-	if (ret < 0) {
-		dev_err(nt->dev, "failed to set PWM divisor (%d)\n", ret);
-		return ret;
-	}
-	par = 0xaa;
-	ret = mipi_dsi_dcs_write(dsi, 0x7f, &par, 1);
-	if (ret < 0) {
-		dev_err(nt->dev, "failed to lock CMD 2 (%d)\n", ret);
-		return ret;
-	}
+	mipi_dsi_dcs_write_var_seq_multi(&dsi_ctx,
+					 MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
+					 pwm_ratio);
+
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xf3, 0xaa);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x00, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7d, 0x01);
+
+	mipi_dsi_dcs_write_var_seq_multi(&dsi_ctx, 0x22, pwm_div);
+
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x7f, 0xaa);
 
 	/* Enable backlight */
-	par = 0x24;
-	ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY,
-				 &par, 1);
-	if (ret < 0) {
-		dev_err(nt->dev, "failed to enable display backlight (%d)\n", ret);
-		return ret;
-	}
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MIPI_DCS_WRITE_CONTROL_DISPLAY,
+				     0x24);
 
-	return 0;
+	return dsi_ctx.accum_err;
 }
 
 static const struct backlight_ops nt35560_bl_ops = {
@@ -244,32 +211,23 @@ static const struct backlight_properties nt35560_bl_props = {
 	.max_brightness = 1023,
 };
 
-static int nt35560_read_id(struct nt35560 *nt)
+static void nt35560_read_id(struct mipi_dsi_multi_context *dsi_ctx)
 {
-	struct mipi_dsi_device *dsi = to_mipi_dsi_device(nt->dev);
+	struct device dev = dsi_ctx->dsi->dev;
 	u8 vendor, version, panel;
 	u16 val;
-	int ret;
 
-	ret = mipi_dsi_dcs_read(dsi, NT35560_DCS_READ_ID1, &vendor, 1);
-	if (ret < 0) {
-		dev_err(nt->dev, "could not vendor ID byte\n");
-		return ret;
-	}
-	ret = mipi_dsi_dcs_read(dsi, NT35560_DCS_READ_ID2, &version, 1);
-	if (ret < 0) {
-		dev_err(nt->dev, "could not read device version byte\n");
-		return ret;
-	}
-	ret = mipi_dsi_dcs_read(dsi, NT35560_DCS_READ_ID3, &panel, 1);
-	if (ret < 0) {
-		dev_err(nt->dev, "could not read panel ID byte\n");
-		return ret;
-	}
+	mipi_dsi_dcs_read_multi(dsi_ctx, NT35560_DCS_READ_ID1, &vendor, 1);
+	mipi_dsi_dcs_read_multi(dsi_ctx, NT35560_DCS_READ_ID2, &version, 1);
+	mipi_dsi_dcs_read_multi(dsi_ctx, NT35560_DCS_READ_ID3, &panel, 1);
+
+	if (dsi_ctx->accum_err < 0)
+		return;
 
 	if (vendor == 0x00) {
-		dev_err(nt->dev, "device vendor ID is zero\n");
-		return -ENODEV;
+		dev_err(&dev, "device vendor ID is zero\n");
+		dsi_ctx->accum_err = -ENODEV;
+		return;
 	}
 
 	val = (vendor << 8) | panel;
@@ -278,16 +236,16 @@ static int nt35560_read_id(struct nt35560 *nt)
 	case DISPLAY_SONY_ACX424AKP_ID2:
 	case DISPLAY_SONY_ACX424AKP_ID3:
 	case DISPLAY_SONY_ACX424AKP_ID4:
-		dev_info(nt->dev, "MTP vendor: %02x, version: %02x, panel: %02x\n",
+		dev_info(&dev,
+			 "MTP vendor: %02x, version: %02x, panel: %02x\n",
 			 vendor, version, panel);
 		break;
 	default:
-		dev_info(nt->dev, "unknown vendor: %02x, version: %02x, panel: %02x\n",
+		dev_info(&dev,
+			 "unknown vendor: %02x, version: %02x, panel: %02x\n",
 			 vendor, version, panel);
 		break;
 	}
-
-	return 0;
 }
 
 static int nt35560_power_on(struct nt35560 *nt)
@@ -322,92 +280,56 @@ static void nt35560_power_off(struct nt35560 *nt)
 static int nt35560_prepare(struct drm_panel *panel)
 {
 	struct nt35560 *nt = panel_to_nt35560(panel);
-	struct mipi_dsi_device *dsi = to_mipi_dsi_device(nt->dev);
-	const u8 mddi = 3;
+	struct mipi_dsi_multi_context dsi_ctx = {
+		.dsi = to_mipi_dsi_device(nt->dev)
+	};
 	int ret;
 
 	ret = nt35560_power_on(nt);
 	if (ret)
 		return ret;
 
-	ret = nt35560_read_id(nt);
-	if (ret) {
-		dev_err(nt->dev, "failed to read panel ID (%d)\n", ret);
-		goto err_power_off;
-	}
+	nt35560_read_id(&dsi_ctx);
 
-	/* Enabe tearing mode: send TE (tearing effect) at VBLANK */
-	ret = mipi_dsi_dcs_set_tear_on(dsi,
+	/* Enable tearing mode: send TE (tearing effect) at VBLANK */
+	mipi_dsi_dcs_set_tear_on_multi(&dsi_ctx,
 				       MIPI_DSI_DCS_TEAR_MODE_VBLANK);
-	if (ret) {
-		dev_err(nt->dev, "failed to enable vblank TE (%d)\n", ret);
-		goto err_power_off;
-	}
 
 	/*
 	 * Set MDDI
 	 *
 	 * This presumably deactivates the Qualcomm MDDI interface and
 	 * selects DSI, similar code is found in other drivers such as the
-	 * Sharp LS043T1LE01 which makes us suspect that this panel may be
-	 * using a Novatek NT35565 or similar display driver chip that shares
-	 * this command. Due to the lack of documentation we cannot know for
-	 * sure.
+	 * Sharp LS043T1LE01.
 	 */
-	ret = mipi_dsi_dcs_write(dsi, NT35560_DCS_SET_MDDI,
-				 &mddi, sizeof(mddi));
-	if (ret < 0) {
-		dev_err(nt->dev, "failed to set MDDI (%d)\n", ret);
-		goto err_power_off;
-	}
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, NT35560_DCS_SET_MDDI, 3);
 
-	/* Exit sleep mode */
-	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
-	if (ret) {
-		dev_err(nt->dev, "failed to exit sleep mode (%d)\n", ret);
-		goto err_power_off;
-	}
-	msleep(140);
+	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
+	mipi_dsi_msleep(&dsi_ctx, 140);
 
-	ret = mipi_dsi_dcs_set_display_on(dsi);
-	if (ret) {
-		dev_err(nt->dev, "failed to turn display on (%d)\n", ret);
-		goto err_power_off;
-	}
+	mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
 	if (nt->video_mode) {
-		/* In video mode turn peripheral on */
-		ret = mipi_dsi_turn_on_peripheral(dsi);
-		if (ret) {
-			dev_err(nt->dev, "failed to turn on peripheral\n");
-			goto err_power_off;
-		}
+		mipi_dsi_turn_on_peripheral_multi(&dsi_ctx);
 	}
 
-	return 0;
-
-err_power_off:
-	nt35560_power_off(nt);
-	return ret;
+	if (dsi_ctx.accum_err < 0)
+		nt35560_power_off(nt);
+	return dsi_ctx.accum_err;
 }
 
 static int nt35560_unprepare(struct drm_panel *panel)
 {
 	struct nt35560 *nt = panel_to_nt35560(panel);
-	struct mipi_dsi_device *dsi = to_mipi_dsi_device(nt->dev);
-	int ret;
+	struct mipi_dsi_multi_context dsi_ctx = {
+		.dsi = to_mipi_dsi_device(nt->dev)
+	};
 
-	ret = mipi_dsi_dcs_set_display_off(dsi);
-	if (ret) {
-		dev_err(nt->dev, "failed to turn display off (%d)\n", ret);
-		return ret;
-	}
+	mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
+	mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
+
+	if (dsi_ctx.accum_err < 0)
+		return dsi_ctx.accum_err;
 
-	/* Enter sleep mode */
-	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
-	if (ret) {
-		dev_err(nt->dev, "failed to enter sleep mode (%d)\n", ret);
-		return ret;
-	}
 	msleep(85);
 
 	nt35560_power_off(nt);
-- 
2.50.1

Re: [PATCH v3 2/3] drm: Add MIPI read_multi func and two write macros

[Doug Anderson]

Hi,

On Tue, Jul 29, 2025 at 11:18 PM Brigham Campbell
<me@brighamcampbell.com> wrote:
>
> Create mipi_dsi_dcs_read_multi(), which accepts a mipi_dsi_multi_context
> struct for improved error handling and cleaner panel driver code.
>
> Create mipi_dsi_dcs_write_var_seq_multi() and
> mipi_dsi_generic_write_var_seq_multi() macros which allow MIPI panel
> drivers to write non-static data to display controllers.
>
> Reviewed-by: Douglas Anderson <dianders@chromium.org>
> Signed-off-by: Brigham Campbell <me@brighamcampbell.com>
> ---
>
> Doug, you had suggested a slightly different shortlog for this patch. I
> adjusted your suggestion to fit within the canonical recommended
> shortlog length of 50 characters. I understand that the 50 character
> limit isn't a rule as much as it is a guideline, but the current
> shortlog seems to me like a good compromise.

Looks good.


> @@ -431,6 +449,23 @@ void mipi_dsi_dcs_set_tear_off_multi(struct mipi_dsi_multi_context *ctx);
>                 mipi_dsi_dcs_write_buffer_multi(ctx, d, ARRAY_SIZE(d)); \
>         } while (0)
>
> +/**
> + * mipi_dsi_dcs_write_var_seq_multi - transmit a DCS command with non-static
> + * payload

I should have been explicit, but the above "non-static" should also be
"non-constant". ;-)

I could probably fix that when applying, or you could send a v4. Up to you.

Speaking of applying this, I'll be on vacation next week, so I won't
be able to apply the patches until the week after. That will also give
anyone else on the list a chance to comment if they want...

-Doug

Re: [PATCH v3 2/3] drm: Add MIPI read_multi func and two write macros

[Brigham Campbell]

On Wed Jul 30, 2025 at 9:56 AM MDT, Doug Anderson wrote:
>> +/**
>> + * mipi_dsi_dcs_write_var_seq_multi - transmit a DCS command with non-static
>> + * payload
>
> I should have been explicit, but the above "non-static" should also be
> "non-constant". ;-)
>
> I could probably fix that when applying, or you could send a v4. Up to you.

Oops. This obviously needed to change as well, but I tunnel-visioned
hard. I'll go ahead and fix it in v4.

Naturally, I wouldn't be at all opposed to you or any other maintainer
making such a small change to one of my patches as it heads upstream,
but I'd rather not ask you to remember to make that change after a long
vacation and a busy merge window. There's no need for me to add even a
little more cognitive load to your job than what's necessary.

> Speaking of applying this, I'll be on vacation next week, so I won't
> be able to apply the patches until the week after. That will also give
> anyone else on the list a chance to comment if they want...

Awesome! I'll plan to sit tight and act on whatever feedback I get on
v4.

If you happen to be flying over northern Utah to get to your
destination, look out the window. I'll wave as you go by.

Cheers,
Brigham

Re: [PATCH v3 1/3] drm/panel: novatek-nt35560: Fix invalid return value

[Linus Walleij]

On Wed, Jul 30, 2025 at 8:17 AM Brigham Campbell <me@brighamcampbell.com> wrote:

> Fix bug in nt35560_set_brightness() which causes the function to
> erroneously report an error. mipi_dsi_dcs_write() returns either a
> negative value when an error occurred or a positive number of bytes
> written when no error occurred. The buggy code reports an error under
> either condition.
>
> Fixes: 8152c2bfd780 ("drm/panel: Add driver for Sony ACX424AKP panel")
> Reviewed-by: Douglas Anderson <dianders@chromium.org>
> Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
> Signed-off-by: Brigham Campbell <me@brighamcampbell.com>

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

(Maybe this is applied already...)

Yours,
Linus Walleij

Re: [PATCH v3 3/3] drm/panel: novatek-nt35560: Clean up driver

[Linus Walleij]

On Wed, Jul 30, 2025 at 8:18 AM Brigham Campbell <me@brighamcampbell.com> wrote:

> Update driver to use the "multi" variants of MIPI functions which
> facilitate improved error handling and cleaner driver code.
>
> Remove information from a comment which was made obsolete by commit
> 994ea402c767 ("drm/panel: Rename Sony ACX424 to Novatek NT35560"), which
> determined that this driver supports the Novatek NT35560 panel
> controller.
>
> Reviewed-by: Douglas Anderson <dianders@chromium.org>
> Signed-off-by: Brigham Campbell <me@brighamcampbell.com>

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

(Maybe this is applied already...)

Yours,
Linus Walleij