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

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>

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 8c3819b02a7f95950f5ca08fa22dda7d49446ab6..ec28aebf5147c7b2f7ebb74dc919ac87581eb407 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -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;
                }
        }