[PATCH] kernel/drm: vblank wait on crtc > 1

Jesse Barnes jbarnes at virtuousgeek.org
Fri Mar 18 15:07:17 PDT 2011

On Fri, 18 Mar 2011 16:58:04 -0500 (CDT)
Ilija Hadzic <ihadzic at research.bell-labs.com> wrote:

> Hi Dave,
> Below is a patch against drm-next branch of 2.6.38-rc8+ kernel that adds 
> the capability to wait on vblank events for CRTCs that are greater than 1 
> and thus cannot be represented with primary/secondary flags in the legacy 
> interface. It was discussed on the dri-devel list in these two threads:
> http://lists.freedesktop.org/archives/dri-devel/2011-March/009009.html
> http://lists.freedesktop.org/archives/dri-devel/2011-March/009025.html
> This patch extends the interface to drm_wait_vblank ioctl so that crtc>1 
> can be represented. It also adds a new capability to drm_getcap ioctl so 
> that the user space can check whether the new interface to drm_wait_vblank 
> is supported (and fall back to the legacy interface if not)

I like the new param check, but I'd still prefer a new ioctl to abusing
the old one.

Jesse Barnes, Intel Open Source Technology Center

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