linux-kernel - Re: [Intel-gfx] [PATCH 5/7] drm/i915: Make DP prepare/commit consistent with DP dpms

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Date:	Thu, 03 Nov 2011 15:59:09 -0700
From:	Keith Packard <keithp@...thp.com>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org
Subject: Re: [Intel-gfx] [PATCH 5/7] drm/i915: Make DP prepare/commit consistent with DP dpms

On Thu, 3 Nov 2011 15:41:25 -0700, Jesse Barnes <jbarnes@...tuousgeek.org> wrote:

> Except for VDD??  That does come on... and shouldn't be any different
> than a full power sequence as far as link training etc go...

Oh, that's a good point. Doing things in this order essentially forces
yet another full panel power sequence delay at this point. Hrm. I'll
have to test again when I get a chance, but perhaps we can turn the sink
DPMS on before we turn the panel power off.

> Oh missed the vdd on, which is in this path too...  So I'm still
> confused by the panel off, vdd on sequence, but at least they're
> consistent.

Right, I'll try doing the sink_dpms before turning the panel off; that
should work just fine, and should make the sequence a bit faster.

-- 
keith.packard@...el.com

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