From: Dmitry Baryshkov dmitry.baryshkov@linaro.org
[ Upstream commit 4d793a02c4967ab14d4ae5e86a51ee02ed78921a ]
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 (DP driver's drm_bridge instance created in msm_dp_bridge_init()) has a chance to do so. Change panel bridge attachment to come after the "dp" bridge attachment (and to use it as a previous bridge).
Fixes: 8a3b4c17f863 ("drm/msm/dp: employ bridge mechanism for display enable and disable") Cc: Kuogee Hsieh quic_khsieh@quicinc.com Signed-off-by: Dmitry Baryshkov dmitry.baryshkov@linaro.org Tested-by: Kuogee Hsieh quic_khsieh@quicinc.com Reviewed-by: Stephen Boyd swboyd@chromium.org Link: https://lore.kernel.org/r/20220211224006.1797846-2-dmitry.baryshkov@linaro.o... [db: fixed commit message according to Stephen's suggestions] Signed-off-by: Dmitry Baryshkov dmitry.baryshkov@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org --- 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; }