linux-kernel - [PATCH 4.4 22/40] drm/msm: Grab a vblank reference when waiting for commit

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Date:   Thu, 20 Dec 2018 10:18:34 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Abhinav Kumar <abhinavk@...eaurora.org>,
        Sean Paul <seanpaul@...omium.org>,
        Rob Clark <robdclark@...il.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.4 22/40] drm/msm: Grab a vblank reference when waiting for commit_done

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

[ 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@...eaurora.org>
Signed-off-by: Sean Paul <seanpaul@...omium.org>
Signed-off-by: Rob Clark <robdclark@...il.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/msm/msm_atomic.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/msm/msm_atomic.c b/drivers/gpu/drm/msm/msm_atomic.c
index 7eb253bc24df..221eaea651d4 100644
--- a/drivers/gpu/drm/msm/msm_atomic.c
+++ b/drivers/gpu/drm/msm/msm_atomic.c
@@ -107,7 +107,12 @@ 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);
 	}
 }
 
-- 
2.19.1