linux-kernel - Re: [PATCH 9/9] drm/i915: Initialize PCH refclks at modeset init time

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Message-Id: <e0d58a$1mfht8@orsmga002.jf.intel.com>
Date:	Tue, 27 Sep 2011 17:56:39 +0100
From:	Chris Wilson <chris@...is-wilson.co.uk>
To:	Keith Packard <keithp@...thp.com>, Dave Airlie <airlied@...hat.com>
Cc:	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	intel-gfx@...ts.freedesktop.org, Keith Packard <keithp@...thp.com>
Subject: Re: [PATCH 9/9] drm/i915: Initialize PCH refclks at modeset init time

On Mon, 26 Sep 2011 23:11:46 -0700, Keith Packard <keithp@...thp.com> wrote:
> The reference clock configuration must be done before any mode setting
> can occur as all outputs must be disabled to change
> anything. Initialize the clocks after turning everything off during
> the initialization process.

Ah, now I see why we moved from using the active configuration earlier. ;-)

Doesn't this prevent us from ever using SSC though, as virtually every
single PCH machine has HDMI encoders that haven't been masked out through
the chicken fuses or VBT?
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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