Hi Andrzej,
On 10/01/2014 05:14 PM, Andrzej Hajda wrote:
> 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.
This problem isn't related with pageflip, it just causes from
7ffd7a68511c710b84db3548a1997fd2625f580a commit (drm: Always reject
drm_vblank_get() after drm_vblank_off()).
We need to use drm_vblank_on() as a counterpart to drm_vblank_off()
after the commit .
How about below patch?
>From 6de01473746af225c688ee430123001d57d9af2a Mon Sep 17 00:00:00 2001
From: Joonyoung Shim <jy0922.shim@xxxxxxxxxxx>
Date: Thu, 2 Oct 2014 17:48:27 +0900
Subject: [PATCH] drm/exynos: use drm_vblank_on()
We need to use drm_vblank_on() as a counterpart to drm_vblank_off()
after the commit 7ffd7a68511c ("drm: Always reject drm_vblank_get()
after drm_vblank_off()"). If not, drm_vblank_get() will be failed
always after drm_vblank_off().
Signed-off-by: Joonyoung Shim <jy0922.shim@xxxxxxxxxxx>
---
drivers/gpu/drm/exynos/exynos_drm_crtc.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_crtc.c b/drivers/gpu/drm/exynos/exynos_drm_crtc.c
index 8e38e9f..dfa209a 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_crtc.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_crtc.c
@@ -71,7 +71,6 @@ static void exynos_drm_crtc_dpms(struct drm_crtc *crtc, int mode)
!atomic_read(&exynos_crtc->pending_flip),
HZ/20))
atomic_set(&exynos_crtc->pending_flip, 0);
- drm_vblank_off(crtc->dev, exynos_crtc->pipe);
}
if (manager->ops->dpms)
@@ -90,6 +89,7 @@ static void exynos_drm_crtc_commit(struct drm_crtc *crtc)
struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
struct exynos_drm_manager *manager = exynos_crtc->manager;
+ drm_vblank_on(crtc->dev, exynos_crtc->pipe);
exynos_drm_crtc_dpms(crtc, DRM_MODE_DPMS_ON);
exynos_plane_commit(crtc->primary);
@@ -177,10 +177,12 @@ static int exynos_drm_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
static void exynos_drm_crtc_disable(struct drm_crtc *crtc)
{
+ struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
struct drm_plane *plane;
int ret;
exynos_drm_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
+ drm_vblank_off(crtc->dev, exynos_crtc->pipe);
drm_for_each_legacy_plane(plane, &crtc->dev->mode_config.plane_list) {
if (plane->crtc != crtc)
--
1.9.1
Thanks.
>
> Signed-off-by: Andrzej Hajda <a.hajda@xxxxxxxxxxx>
> ---
> 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)
>
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