[Why]
In dm resume, we firstly restore dc state and do the mst resume for
topology probing thereafter. If we change dpcd DP_MSTM_CTRL value
after LT in mst reume, it will cause light up problem on the hub.
[How]
Revert the commit 202dc359adda ("drm/amd/display: Defer handling mst
up request in resume"). And adjust the reason to trigger
dc_link_detect by DETECT_REASON_RESUMEFROMS3S4.
Fixes: 202dc359adda ("drm/amd/display: Defer handling mst up request in resume")
Signed-off-by: Wayne Lin <Wayne.Lin@xxxxxxx>
---
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index c64cc2378a94..b01452eb0981 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -2569,6 +2569,7 @@ static void resume_mst_branch_status(struct drm_dp_mst_topology_mgr *mgr)
ret = drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL,
DP_MST_EN |
+ DP_UP_REQ_EN |
DP_UPSTREAM_IS_SRC);
if (ret < 0) {
drm_dbg_kms(mgr->dev, "mst write failed - undocked during suspend?\n");
@@ -3171,7 +3172,7 @@ static int dm_resume(void *handle)
} else {
mutex_lock(&dm->dc_lock);
dc_exit_ips_for_hw_access(dm->dc);
- dc_link_detect(aconnector->dc_link, DETECT_REASON_HPD);
+ dc_link_detect(aconnector->dc_link, DETECT_REASON_RESUMEFROMS3S4);
mutex_unlock(&dm->dc_lock);
}
--
2.37.3
