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 <[email protected]> Signed-off-by: Sean Paul <[email protected]> Signed-off-by: Rob Clark <[email protected]> Signed-off-by: Sasha Levin <[email protected]>
akeromi · Dec 21, 2018 · 01ba4fd · 01ba4fd
1 parent 801f12d
commit 01ba4fd
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/drivers/gpu/drm/msm/msm_atomic.c b/drivers/gpu/drm/msm/msm_atomic.c
@@ -32,7 +32,12 @@ static void msm_atomic_wait_for_commit_done(struct drm_device *dev,
 		if (!new_crtc_state->active)
 			continue;
 
+		if (drm_crtc_vblank_get(crtc))
+			continue;
+
 		kms->funcs->wait_for_crtc_commit_done(kms, crtc);
+
+		drm_crtc_vblank_put(crtc);
 	}
 }