linux-kernel - [PATCH] drm/exynos: fix vblank handling during dpms off

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Date:	Wed, 01 Oct 2014 10:14:47 +0200
From:	Andrzej Hajda <a.hajda@...sung.com>
To:	Inki Dae <inki.dae@...sung.com>
Cc:	Andrzej Hajda <a.hajda@...sung.com>,
	Joonyoung Shim <jy0922.shim@...sung.com>,
	Seung-Woo Kim <sw0312.kim@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	David Airlie <airlied@...ux.ie>,
	Kukjin Kim <kgene.kim@...sung.com>,
	dri-devel@...ts.freedesktop.org, linux-samsung-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] drm/exynos: fix vblank handling during dpms off

The patch disables vblanks during dpms off only if pagefilp has
not been finished. It also replaces drm_vblank_off with drm_crtc_vblank_put.
It fixes issue with page_flip ioctl not being able to acquire vblank counter.

Signed-off-by: Andrzej Hajda <a.hajda@...sung.com>
---
Hi Inki,

This is fix (or just workaround) of the problem you have reported.
Please carefully verify it, as I am not familiar with pageflip code.

Regards
Andrzej
---
 drivers/gpu/drm/exynos/exynos_drm_crtc.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_crtc.c b/drivers/gpu/drm/exynos/exynos_drm_crtc.c
index 8e38e9f..57fa94d 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_crtc.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_crtc.c
@@ -69,9 +69,10 @@ static void exynos_drm_crtc_dpms(struct drm_crtc *crtc, int mode)
 		/* wait for the completion of page flip. */
 		if (!wait_event_timeout(exynos_crtc->pending_flip_queue,
 				!atomic_read(&exynos_crtc->pending_flip),
-				HZ/20))
+				HZ/20)) {
 			atomic_set(&exynos_crtc->pending_flip, 0);
-		drm_vblank_off(crtc->dev, exynos_crtc->pipe);
+			drm_crtc_vblank_put(crtc);
+		}
 	}
 
 	if (manager->ops->dpms)
-- 
1.9.1

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