linux-kernel - Re: [PATCH 2/9] drm/i915/intel_i2c: assign HDMI port D to pin pair 6

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Date:	Thu, 8 Mar 2012 02:03:14 +0800
From:	Daniel Kurtz <djkurtz@...omium.org>
To:	Chris Wilson <chris@...is-wilson.co.uk>
Cc:	Keith Packard <keithp@...thp.com>, David Airlie <airlied@...ux.ie>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	Yufeng Shen <miletus@...omium.org>,
	Benson Leung <bleung@...omium.org>,
	Sameer Nanda <snanda@...omium.org>
Subject: Re: [PATCH 2/9] drm/i915/intel_i2c: assign HDMI port D to pin pair 6

On Wed, Mar 7, 2012 at 9:23 PM, Chris Wilson <chris@...is-wilson.co.uk> wrote:
>
> On Wed,  7 Mar 2012 19:50:43 +0800, Daniel Kurtz <djkurtz@...omium.org>
> wrote:
> > According to i915 documentation [1], "Port D" (DP/HDMI Port D) is
> > actually gmbus pin pair 6 (gmbus0.2:0 == 110b GPIOF), not 7 (111b).
> > Pin pair 7 is a reserved pair.
> >
> > [1] Documentation for [DevSNB+] and [DevIBX], as found on
> > http://intellinuxgraphics.org
>
> The problem is I took those definitions from the gen2 specs, and munged
> in the obvious changes with gen3... And it appears that the GPIO pin
> assignment versus GMBUS has changed over the years. And so the can of
> worms is opened!

I'm not sure what exactly you mean by gen2 and gen3 specs, but, as far
as I can tell, the GPIO pin assignment is the same for both Cougar
Point (Sandy Bridge) [1] and Ibex Peak (?) [2].  Although, the
documentation is a bit confusing and it is difficult to tell.

[1] http://intellinuxgraphics.org/documentation/SNB/IHD_OS_Vol3_Part3.pdf
[2] http://intellinuxgraphics.org/IHD_OS_Vol3_Part3r2.pdf

What do you mean exactly by gen2 & gen3?  Can you point to docs?

> -Chris
>
> --
> Chris Wilson, Intel Open Source Technology Centre
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