drm/i915/dp: correct eDP lane count and bpp

With the old check we'd never set lane_count or bpp to different values
on PCH attached eDP panels.
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>

drivers/gpu/drm/i915/intel_dp.c

@@ -672,8 +672,10 @@ intel_dp_set_m_n(struct drm_crtc *crtc, struct drm_display_mode *mode,
 		intel_dp = enc_to_intel_dp(encoder);
 		if (intel_dp->base.type == INTEL_OUTPUT_DISPLAYPORT) {
 			lane_count = intel_dp->lane_count;
-			if (is_pch_edp(intel_dp))
-				bpp = dev_priv->edp.bpp;
+			break;
+		} else if (is_edp(intel_dp)) {
+			lane_count = dev_priv->edp.lanes;
+			bpp = dev_priv->edp.bpp;
 			break;
 		}
 	}