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drm/i915: Use DPCD value for max DP lanes.

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The BIOS VBT value for an eDP panel has been shown to be incorrect on
one machine, and we haven't found any machines where the DPCD value
was wrong, so we'll use the DPCD value everywhere.

Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Keith Packard 2011-11-02 13:03:47 -07:00
parent b34f1f0931
commit 9a10f401a4
1 changed files with 9 additions and 14 deletions
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23
drivers/gpu/drm/i915/intel_dp.c
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@ -154,16 +154,12 @@ intel_edp_link_config(struct intel_encoder *intel_encoder,
static int
intel_dp_max_lane_count(struct intel_dp *intel_dp)
{
int max_lane_count = 4;
if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11) {
max_lane_count = intel_dp->dpcd[DP_MAX_LANE_COUNT] & 0x1f;
switch (max_lane_count) {
case 1: case 2: case 4:
break;
default:
max_lane_count = 4;
}
int max_lane_count = intel_dp->dpcd[DP_MAX_LANE_COUNT] & 0x1f;
switch (max_lane_count) {
case 1: case 2: case 4:
break;
default:
max_lane_count = 4;
}
return max_lane_count;
}
@ -765,12 +761,11 @@ 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 || is_pch_edp(intel_dp)) {
if (intel_dp->base.type == INTEL_OUTPUT_DISPLAYPORT ||
intel_dp->base.type == INTEL_OUTPUT_EDP)
{
lane_count = intel_dp->lane_count;
break;
} else if (is_cpu_edp(intel_dp)) {
lane_count = dev_priv->edp.lanes;
break;
}
}