drm/msm: Grab a vblank reference when waiting for commit_done

[ Upstream commit 3b712e43e3876b42b38321ecf790a1f5fe59c834 ]

Similar to the atomic helpers, we should enable vblank while we're
waiting for the commit to finish. DPU needs this, MDP5 seems to work
fine without it.

Reviewed-by: Abhinav Kumar <abhinavk@codeaurora.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/msm/msm_atomic.c b/drivers/gpu/drm/msm/msm_atomic.c
index 73bae382eac3acad17460a782e6422ec992a7963..5c58a98f67c05f93ae3f9edcd6f73fa4b5deb244 100644 (file)
--- a/drivers/gpu/drm/msm/msm_atomic.c
+++ b/drivers/gpu/drm/msm/msm_atomic.c
@@ -98,7 +98,12 @@ static void msm_atomic_wait_for_commit_done(struct drm_device *dev,
                if (old_state->legacy_cursor_update)
                        continue;
 
+               if (drm_crtc_vblank_get(crtc))
+                       continue;
+
                kms->funcs->wait_for_crtc_commit_done(kms, crtc);
+
+               drm_crtc_vblank_put(crtc);
        }
 }