From: Sean Paul <seanpaul@chromium.org>
Date: Wed, 3 Oct 2018 20:22:31 +0000 (-0400)
Subject: drm/msm: Grab a vblank reference when waiting for commit_done
X-Git-Tag: v4.9.147~27
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=945d5195c61222c4cfb222c076309f04464df81c;p=thirdparty%2Fkernel%2Fstable.git

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 73bae382eac3a..5c58a98f67c05 100644
--- 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);
 	}
 }