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SubjectRe: [PATCH] drm/exynos: fix vblank handling during dpms off
On Thu, Oct 09, 2014 at 02:43:02PM +0900, Alexandre Courbot wrote:
> But there might be another issue, which is that calls to
> drm_vblank_get() will return -EINVAL if invoked between drm_blank_off
> and drm_blank_on. Is this really the desired behavior? Can it at least
> happen? If so, how are drivers supposed to react to this situation?

I've not yet seen the commit which causes this problem, but I hope
that drm_wait_vblank() isn't affected by this. In current mainline,
drm_vblank_get() is used inside drm_wait_vblank(), which is called as
a result of userspace calling DRM_IOCTL_WAIT_VBLANK.

So, what is the effect of this change on user applications making use
of the vblank wait ioctl - and is that change intended?

--
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according to speedtest.net.


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