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

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Date:	Wed, 02 Nov 2011 13:13:52 -0400
From:	Adam Jackson <ajax@...hat.com>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
CC:	Keith Packard <keithp@...thp.com>, 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 12:20 PM, Jesse Barnes wrote:

> @@ -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?

Given the choice of trusting DPCD or the VBT, I'd definitely prefer DPCD.

- ajax

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