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Message-ID: <20250729054435.1209156-4-me@brighamcampbell.com>
Date: Mon, 28 Jul 2025 23:44:35 -0600
From: Brigham Campbell <me@...ghamcampbell.com>
To: maarten.lankhorst@...ux.intel.com,
mripard@...nel.org,
tzimmermann@...e.de,
airlied@...il.com,
simona@...ll.ch,
linus.walleij@...aro.org,
neil.armstrong@...aro.org,
jessica.zhang@....qualcomm.com,
sam@...nborg.org
Cc: dianders@...omium.org,
skhan@...uxfoundation.org,
linux-kernel-mentees@...ts.linux.dev,
dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org,
Brigham Campbell <me@...ghamcampbell.com>
Subject: [PATCH v2 3/3] drm/panel: novatek-nt35560: Clean up driver
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.
Signed-off-by: Brigham Campbell <me@...ghamcampbell.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
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