On Thu, Jan 30, 2014 at 1:53 AM, Ilia Mirkin <imirkin@xxxxxxxxxxxx> wrote:
> Since commit 0fa9061ae8c ("drm/nouveau/mc: handle irq-related setup
> ourselves"), drm_device->irq_enabled remained unset. This is needed in
> order to properly wait for a vblank event in the generic drm code.
>
> See https://bugs.freedesktop.org/show_bug.cgi?id=74195
>
> Reported-by: Jan Janecek <janjanjanx@xxxxxxxxx>
> Signed-off-by: Ilia Mirkin <imirkin@xxxxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx # 3.10+
> ---
>
> TBH, not sure why this fixes things, as irq_enabled == false should have
> caused the vblank wait to not wait, since the condition would be
> immediately true.
>
> Jan, mind double-checking that this version of the patch fixes things
> for you? Not 100% sure where you stuck the irq_enabled=true line when you
> tried it out.
The core drm vblank code bails out if dev->irq_enabled isn't set. So
if you opt to not use the drm irq helpers and instead roll your own
you still need to set this to allow vblank wait ioctls and related
stuff. It's even documented in the drm DocBook ;-) So
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
if you will.
Cheers, Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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