[Intel-gfx] [PATCH 1/6] drm/i915: make CRTC enable/disable asynchronous

[Jesse Barnes]

On Thu, 06 Mar 2014 01:29:14 +0200
Imre Deak <imre.deak at intel.com> wrote:

> On Wed, 2014-03-05 at 14:48 -0800, Jesse Barnes wrote:
> > This lets us return to userspace more quickly and should improve init
> > and suspend/resume times as well, allowing us to return to userspace
> > sooner.
> 
> IMHO this is a good move towards a full command queue based solution for
> kms commands, where eventually we have to think less of concurrency.
> That is if we can queue all the other kms commands too (flip,
> set_plane). But I don't see why that wouldn't be possible.
> 
> Btw, why do you have a separate disable and enable queue?

As opposed to a dedicated work queue for both combined?  I had a
separate queue in an earlier patch, but dropped it while debugging some
other stuff.  We should bring it back to ensure ordering.  That would
remove the need for a few of the syncs, and would also let us queue a
check at the appropriate time on the same queue.

-- 
Jesse Barnes, Intel Open Source Technology Center