On 2/11/2022 2:40 PM, Dmitry Baryshkov wrote:
In commit 8a3b4c17f863 ("drm/msm/dp: employ bridge mechanism for display
enable and disable") the DP driver received a drm_bridge instance, which
is always attached to the encoder as a root bridge. However it conflicts
with the panel_bridge support for eDP panels. The panel bridge attaches
to the encoder before the "dp" bridge has a chace to do so. Change
panel_bridge attachment to come after dp_bridge attachment.
Fixes: 8a3b4c17f863 ("drm/msm/dp: employ bridge mechanism for display enable and
disable")
Cc: Kuogee Hsieh <quic_khs...@quicinc.com>
Signed-off-by: Dmitry Baryshkov <dmitry.barysh...@linaro.org>
Tested-by: Kuogee Hsieh <quic_khs...@quicinc.com>
---
drivers/gpu/drm/msm/dp/dp_drm.c | 21 +++++++++++----------
1 file changed, 11 insertions(+), 10 deletions(-)
diff --git a/drivers/gpu/drm/msm/dp/dp_drm.c b/drivers/gpu/drm/msm/dp/dp_drm.c
index d4d360d19eba..26ef41a4c1b6 100644
--- a/drivers/gpu/drm/msm/dp/dp_drm.c
+++ b/drivers/gpu/drm/msm/dp/dp_drm.c
@@ -169,16 +169,6 @@ struct drm_connector *dp_drm_connector_init(struct msm_dp
*dp_display)
drm_connector_attach_encoder(connector, dp_display->encoder);
- if (dp_display->panel_bridge) {
- ret = drm_bridge_attach(dp_display->encoder,
- dp_display->panel_bridge, NULL,
- DRM_BRIDGE_ATTACH_NO_CONNECTOR);
- if (ret < 0) {
- DRM_ERROR("failed to attach panel bridge: %d\n", ret);
- return ERR_PTR(ret);
- }
- }
-
return connector;
}
@@ -246,5 +236,16 @@ struct drm_bridge *msm_dp_bridge_init(struct msm_dp *dp_display, struct drm_devi
return ERR_PTR(rc);
}
+ if (dp_display->panel_bridge) {
+ rc = drm_bridge_attach(dp_display->encoder,
+ dp_display->panel_bridge, bridge,
+ DRM_BRIDGE_ATTACH_NO_CONNECTOR);
+ if (rc < 0) {
+ DRM_ERROR("failed to attach panel bridge: %d\n", rc);
+ drm_bridge_remove(bridge);
+ return ERR_PTR(rc);
+ }
+ }
+
return bridge;
}
