linux-kernel - Re: [Intel-gfx] [PATCH 06/21] drm/i915: Unlock PCH_PP

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Date:	Sat, 1 Oct 2011 11:35:58 +0200
From:	Daniel Vetter <daniel@...ll.ch>
To:	Keith Packard <keithp@...thp.com>
Cc:	Daniel Vetter <daniel@...ll.ch>, Dave Airlie <airlied@...hat.com>,
	intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org
Subject: Re: [Intel-gfx] [PATCH 06/21] drm/i915: Unlock PCH_PP_CONTROL always

On Fri, Sep 30, 2011 at 04:14:40PM -0700, Keith Packard wrote:
> On Fri, 30 Sep 2011 19:09:46 +0200, Daniel Vetter <daniel@...ll.ch> wrote:
> 
> > grep shows that we also write to PCH_PP_CONTROL in intel_lvds.c in the
> > dpms functions - any reasons these two writes are left out?
> 
> Upon a bit of review:
> 
>   The bspec makes it clear that this write protect key only needs to
>   be written for eDP on DPA -- it's a work-around for a bug where panel
>   power sequencing wouldn't work right.
> 
>   The LVDS code does disable write protect in the _init function, which
>   seems global enough, but misses the resume case. We shouldn't ever
>   need to set this field though; it write protects registers only
>   when the panel is running. We could presumably remove the
>   write protect disable entirely in the LVDS code.
> 
> So, I think the patch as written is correct.

Convinced.
Reviewed-by: Daniel Vetter <daniel.vetter@...ll.ch>
-- 
Daniel Vetter
Mail: daniel@...ll.ch
Mobile: +41 (0)79 365 57 48
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