linux-kernel - Re: [Intel-gfx] [PATCH 3/7] drm/i915: Treat PCH eDP like DP in most places

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Message-ID: <4EB1A9A7.8070900@redhat.com>
Date:	Wed, 02 Nov 2011 16:35:51 -0400
From:	Adam Jackson <ajax@...hat.com>
To:	Keith Packard <keithp@...thp.com>
CC:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org
Subject: Re: [Intel-gfx] [PATCH 3/7] drm/i915: Treat PCH eDP like DP in most
 places

On 11/2/11 4:05 PM, Keith Packard wrote:
> On Wed, 02 Nov 2011 15:36:20 -0400, Adam Jackson<ajax@...hat.com>  wrote:
>
>> The VBT is going to be crap.
>
> The only question then is what to do with hardware that doesn't have the
> DPCD value -- that's "new" in revision 0x11, after all.

It is?  The DP 1.1a text for lane count is "For Rev.1.1, only the 
following three values are supported. All other values are reserved."  I 
don't think that implies anything about what it meant in 1.0.  It does 
say that bits 7:5 of that register are reserved in 1.0 though; since it 
doesn't have any versioning on bits 4:0 I'd think that means they're 
interpreted the same in 1.0 as in 1.1.

Unless you have a copy of the 1.0 spec?

Again, not that it probably matters much.  I think the installed base of 
DP 1.0 sinks is zero, I've literally never seen one.

> How about this:
>
> commit 34ebe02cc78f20ae6b7865c5087c3b5ac7810185
> Author: Keith Packard<keithp@...thp.com>
> Date:   Wed Nov 2 13:03:47 2011 -0700
>
>      drm/i915: Use DPCD value for max DP lanes where possible
>
>      Fall back to the VBT value for eDP monitors only when DPCD is missing
>      the value.
>
>      Signed-off-by: Keith Packard<keithp@...thp.com>

Reviewed-by: Adam Jackson <ajax@...hat.com>

- ajax
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