Hi Daniel
Thank you for comments.
On 05/20/2014 07:02 PM, Daniel Kurtz wrote:
On Wed, May 14, 2014 at 2:26 PM, YoungJun Cho <yj44.cho@xxxxxxxxxxx> wrote:
There could be the case that the page flip operation isn't finished correctly
with some abnormal condition such as panel reset. So this patch replaces
wait_event() with wait_event_timeout() to avoid waiting for page flip completion
infinitely.
This solution looks like we aren't really handling some conditions
completely (such as "panel reset"?). In cases where this timeout can
occur, shouldn't we be clearing pending_flip when we detect that the
flip will never complete?
Nice catch!.
The others except pending_flip issue are done in drm_vblank_off()
instead of exynos_drm_crtc_finish_pageflip() at this case.
I'll do it for this routine and exynos_drm_crtc_page_flip() also.
There is a leak point in exynos_drm_crtc_page_flip() when
exynos_drm_crtc_mode_set_commit() is failed.
Thank you.
Best regards YJ
-Dan
Signed-off-by: YoungJun Cho <yj44.cho@xxxxxxxxxxx>
Acked-by: Inki Dae <inki.dae@xxxxxxxxxxx>
Acked-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
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 95c9435..485fa26 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_crtc.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_crtc.c
@@ -69,8 +69,9 @@ static void exynos_drm_crtc_dpms(struct drm_crtc *crtc, int mode)
if (mode > DRM_MODE_DPMS_ON) {
/* wait for the completion of page flip. */
- wait_event(exynos_crtc->pending_flip_queue,
- atomic_read(&exynos_crtc->pending_flip) == 0);
+ wait_event_timeout(exynos_crtc->pending_flip_queue,
+ !atomic_read(&exynos_crtc->pending_flip),
+ HZ/20);
drm_vblank_off(crtc->dev, exynos_crtc->pipe);
}
--
1.7.9.5
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