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

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Date:	Wed, 2 Nov 2011 09:20:19 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Keith Packard <keithp@...thp.com>
Cc:	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 Tue,  1 Nov 2011 23:20:26 -0700
Keith Packard <keithp@...thp.com> wrote:

> PCH eDP has many of the same needs as regular PCH DP connections,
> including the DP_CTl bit settings, the TRANS_DP_CTL register.
> 
> Signed-off-by: Keith Packard <keithp@...thp.com>
> ---
>  drivers/gpu/drm/i915/intel_display.c |    3 +-
>  drivers/gpu/drm/i915/intel_dp.c      |  112 ++++++++++++++++++++++++----------
>  2 files changed, 81 insertions(+), 34 deletions(-)
> 

Might be nice to have some function pointers to handle the different
types better.  But that could be a separate cleanup.  I'd rather have
duplicated code than fragile code...

Reviewed-by: Jesse Barnes <jbarnes@...tuousgeek.org>

But I was curious about this hunk:

@@ -766,10 +766,10 @@ intel_dp_set_m_n(struct drm_crtc *crtc, struct drm_display_mode *mode,
 			continue;
 
 		intel_dp = enc_to_intel_dp(encoder);
-		if (intel_dp->base.type == INTEL_OUTPUT_DISPLAYPORT) {
+		if (intel_dp->base.type == INTEL_OUTPUT_DISPLAYPORT || is_pch_edp(intel_dp)) {
 			lane_count = intel_dp->lane_count;
 			break;
-		} else if (is_edp(intel_dp)) {
+		} else if (is_cpu_edp(intel_dp)) {
 			lane_count = dev_priv->edp.lanes;
 			break;
 		}

I guess this means we can't trust the BIOS settings for PCH eDP?

-- 
Jesse Barnes, Intel Open Source Technology Center

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