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

[Eric Anholt]

On Fri, 2009-03-27 at 16:08 -0700, Jesse Barnes wrote:
> 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>

We need to just figure out how to use the GMBUS stuff successfully.
It's what everyone else uses as far as I know.

-- 
Eric Anholt
eric at anholt.net                         eric.anholt at intel.com


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