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

Keith Packard
2011-11-02T17:10:25Z

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On Wed, 2 Nov 2011 09:20:19 -0700, Jesse Barnes <jbarnes@virtuousgeek.org> wrote:

> 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?

I'm pretty sure this isn't the right place to look at this value in any
case; we're setting the m/n ratios after already deciding how many lanes
to use. Getting this wrong means sending the wrong timing to the
monitor, not setting a different mode.

In any case, my AIO box sets the BIOS value to 1, when it needs 2 lanes
for the mode it uses.

--
keith.packard@intel.com

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