[Intel-gfx] [PATCH 2/8] drm/i915: skip redundant operations whilst enabling pipes and planes

[Jesse Barnes]

On Fri, 18 Mar 2011 08:02:04 +0000
Chris Wilson <chris at chris-wilson.co.uk> wrote:

> If the pipe or plane is already enabled, then we do not need to enable
> it again and can skip the delay.
> 
> References: https://bugs.freedesktop.org/show_bug.cgi?id=34601
> Cc: Jesse Barnes <jbarnes at virtuousgeek.org>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> ---

Does this one actually fix the issue?  Unless we're trying to get
suspend, resume, or mode setting down under 100ms it's probably not
worth it to try to avoid the vblank waits (this is me being paranoid
about our mode setting code).

-- 
Jesse Barnes, Intel Open Source Technology Center