This is a note to let you know that I've just added the patch titled
drm/bridge: lt8912b: Add missing drm_bridge_attach call
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-bridge-lt8912b-add-missing-drm_bridge_attach-cal.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit e0842810e16a4adfac827f17a838c9e9e724d703
Author: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx>
Date: Fri Aug 4 13:48:13 2023 +0300
drm/bridge: lt8912b: Add missing drm_bridge_attach call
[ Upstream commit f45acf7acf75921c0409d452f0165f51a19a74fd ]
The driver does not call drm_bridge_attach(), which causes the next
bridge to not be added to the bridge chain. This causes the pipeline
init to fail when DRM_BRIDGE_ATTACH_NO_CONNECTOR is used.
Add the call to drm_bridge_attach().
Fixes: 30e2ae943c26 ("drm/bridge: Introduce LT8912B DSI to HDMI bridge")
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx>
Reviewed-by: Robert Foss <rfoss@xxxxxxxxxx>
Signed-off-by: Robert Foss <rfoss@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20230804-lt8912b-v1-4-c542692c6a2f@xxxxxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/bridge/lontium-lt8912b.c b/drivers/gpu/drm/bridge/lontium-lt8912b.c
index 73b6fcae6dca8..6891863ed5104 100644
--- a/drivers/gpu/drm/bridge/lontium-lt8912b.c
+++ b/drivers/gpu/drm/bridge/lontium-lt8912b.c
@@ -548,6 +548,13 @@ static int lt8912_bridge_attach(struct drm_bridge *bridge,
struct lt8912 *lt = bridge_to_lt8912(bridge);
int ret;
+ ret = drm_bridge_attach(bridge->encoder, lt->hdmi_port, bridge,
+ DRM_BRIDGE_ATTACH_NO_CONNECTOR);
+ if (ret < 0) {
+ dev_err(lt->dev, "Failed to attach next bridge (%d)\n", ret);
+ return ret;
+ }
+
if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
ret = lt8912_bridge_connector_init(bridge);
if (ret) {
