drm/amd/display: Only revalidate bandwidth on medium and fast updates

[Why]
Changes that are fast don't require updating DLG parameters making
this call unnecessary. Considering this is an expensive call it should
not be done on every flip.

DML touches clocks, p-state support, DLG params and a few other DC
internal flags and these aren't expected during fast. A hang has been
reported with this change when called on every flip which suggests that
modifying these fields is not recommended behavior on fast updates.

[How]
Guard the validation to only happen if update type isn't FAST.

Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1191
Fixes: a24eaa5c51255b ("drm/amd/display: Revalidate bandwidth before commiting DC updates")
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Roman Li <Roman.Li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 6f93a6c..d016f50 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -2538,10 +2538,12 @@ void dc_commit_updates_for_stream(struct dc *dc,
 
        copy_stream_update_to_stream(dc, context, stream, stream_update);
 
-       if (!dc->res_pool->funcs->validate_bandwidth(dc, context, false)) {
-               DC_ERROR("Mode validation failed for stream update!\n");
-               dc_release_state(context);
-               return;
+       if (update_type > UPDATE_TYPE_FAST) {
+               if (!dc->res_pool->funcs->validate_bandwidth(dc, context, false)) {
+                       DC_ERROR("Mode validation failed for stream update!\n");
+                       dc_release_state(context);
+                       return;
+               }
        }
 
        commit_planes_for_stream(