[Intel-gfx] [PATCH] KMS: do a faster EDID

[Jesse Barnes]

On Mon, 23 Mar 2009 13:48:01 -0700
Arjan van de Ven <arjan at infradead.org> wrote:

> >From a121507f31e37a809dfa21c9756aa83f36d7acbf Mon Sep 17 00:00:00
> >2001
> From: Arjan van de Ven <arjan at linux.intel.com>
> Date: Mon, 23 Mar 2009 13:37:20 -0700
> Subject: [PATCH] KMS: do a faster EDID
> 
> for some outputs (like LVDS), the current delays in the EDID reader
> are way overkill.
> 
> This patch makes the EDID reader try twice; first with a 5x faster
> probe, and if that fails, it probes at the current speed. This
> reduces probe time on my LVDS panel significantly.
> 
> Signed-off-by: Arjan van de Ven <arjan at linux.intel.com>

Theoretically this should work fine, but there may be more savings to
be had in the underlying EDID fetching code & timing.  I know our
timings aren't as good as X yet, but we may be able to do something
similar in the actual DDC probing as well (use fast timings first, then
fall back to robust ones if that fails) and get a double benefit.  Have
you looked at that at all?

Either way, this one looks ok, so I'm ok with it as long as Dave is.

Acked-by: Jesse Barnes <jbarnes at virtuousgeek.org>

-- 
Jesse Barnes, Intel Open Source Technology Center