The connector type for the DataImage SCF0700C48GGU18 panel is missing and
devm_drm_panel_bridge_add() requires connector type to be set. This leads
to a warning and a backtrace in the kernel log and panel does not work:
"
WARNING: CPU: 3 PID: 38 at drivers/gpu/drm/bridge/panel.c:379 devm_drm_of_get_bridge+0xac/0xb8
"
The warning is triggered by a check for valid connector type in
devm_drm_panel_bridge_add(). If there is no valid connector type
set for a panel, the warning is printed and panel is not added.
Fill in the missing connector type to fix the warning and make
the panel operational once again.

Cc: stable@vger.kernel.org
Fixes: 97ceb1fb08b6 ("drm/panel: simple: Add support for DataImage SCF0700C48GGU18")
Signed-off-by: Marek Vasut <marex@nabladev.com>
---
Cc: David Airlie <airlied@gmail.com>
Cc: Jessica Zhang <jesszhan0024@gmail.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Neil Armstrong <neil.armstrong@linaro.org>
Cc: Simona Vetter <simona@ffwll.ch>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: dri-devel@lists.freedesktop.org
Cc: kernel@dh-electronics.com
Cc: linux-kernel@vger.kernel.org
---
 drivers/gpu/drm/panel/panel-simple.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index 3acc9f3dac16a..e33ee2308e715 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -1900,6 +1900,7 @@ static const struct panel_desc dataimage_scf0700c48ggu18 = {
 	},
 	.bus_format = MEDIA_BUS_FMT_RGB888_1X24,
 	.bus_flags = DRM_BUS_FLAG_DE_HIGH | DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE,
+	.connector_type = DRM_MODE_CONNECTOR_DPI,
 };
 
 static const struct display_timing dlc_dlc0700yzg_1_timing = {
-- 
2.51.0

Hi,

On Sat, 10 Jan 2026 16:27:28 +0100, Marek Vasut wrote:
> The connector type for the DataImage SCF0700C48GGU18 panel is missing and
> devm_drm_panel_bridge_add() requires connector type to be set. This leads
> to a warning and a backtrace in the kernel log and panel does not work:
> "
> WARNING: CPU: 3 PID: 38 at drivers/gpu/drm/bridge/panel.c:379 devm_drm_of_get_bridge+0xac/0xb8
> "
> The warning is triggered by a check for valid connector type in
> devm_drm_panel_bridge_add(). If there is no valid connector type
> set for a panel, the warning is printed and panel is not added.
> Fill in the missing connector type to fix the warning and make
> the panel operational once again.
> 
> [...]

Thanks, Applied to https://gitlab.freedesktop.org/drm/misc/kernel.git (drm-misc-fixes)

[1/1] drm/panel-simple: fix connector type for DataImage SCF0700C48GGU18 panel
      https://gitlab.freedesktop.org/drm/misc/kernel/-/commit/6ab3d4353bf75005eaa375677c9fed31148154d6

-- 
Neil

On 1/10/26 16:27, Marek Vasut wrote:
> The connector type for the DataImage SCF0700C48GGU18 panel is missing and
> devm_drm_panel_bridge_add() requires connector type to be set. This leads
> to a warning and a backtrace in the kernel log and panel does not work:
> "
> WARNING: CPU: 3 PID: 38 at drivers/gpu/drm/bridge/panel.c:379 devm_drm_of_get_bridge+0xac/0xb8
> "
> The warning is triggered by a check for valid connector type in
> devm_drm_panel_bridge_add(). If there is no valid connector type
> set for a panel, the warning is printed and panel is not added.
> Fill in the missing connector type to fix the warning and make
> the panel operational once again.
> 
> Cc: stable@vger.kernel.org
> Fixes: 97ceb1fb08b6 ("drm/panel: simple: Add support for DataImage SCF0700C48GGU18")
> Signed-off-by: Marek Vasut <marex@nabladev.com>
> ---
> Cc: David Airlie <airlied@gmail.com>
> Cc: Jessica Zhang <jesszhan0024@gmail.com>
> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Cc: Maxime Ripard <mripard@kernel.org>
> Cc: Neil Armstrong <neil.armstrong@linaro.org>
> Cc: Simona Vetter <simona@ffwll.ch>
> Cc: Thomas Zimmermann <tzimmermann@suse.de>
> Cc: dri-devel@lists.freedesktop.org
> Cc: kernel@dh-electronics.com
> Cc: linux-kernel@vger.kernel.org
> ---
>   drivers/gpu/drm/panel/panel-simple.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
> index 3acc9f3dac16a..e33ee2308e715 100644
> --- a/drivers/gpu/drm/panel/panel-simple.c
> +++ b/drivers/gpu/drm/panel/panel-simple.c
> @@ -1900,6 +1900,7 @@ static const struct panel_desc dataimage_scf0700c48ggu18 = {
>   	},
>   	.bus_format = MEDIA_BUS_FMT_RGB888_1X24,
>   	.bus_flags = DRM_BUS_FLAG_DE_HIGH | DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE,
> +	.connector_type = DRM_MODE_CONNECTOR_DPI,
>   };
>   
>   static const struct display_timing dlc_dlc0700yzg_1_timing = {

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>

Thanks,
Neil