drm/i915/skl: Explicitly check for eDP in skl_ddi_pll_select()

Assuming any connector that isn't DP, MST, or HDMI is eDP definitely
seems likely to cover up other bugs in the future.
Signed-off-by: NLyude <cpaul@redhat.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1454423709-21882-2-git-send-email-cpaul@redhat.com

drivers/gpu/drm/i915/intel_ddi.c

@@ -1546,8 +1546,10 @@ skl_ddi_pll_select(struct intel_crtc *intel_crtc,
 		}
 
 		cfgcr1 = cfgcr2 = 0;
-	} else /* eDP */
+	} else if (intel_encoder->type == INTEL_OUTPUT_EDP) {
 		return true;
+	} else
+		return false;
 
 	memset(&crtc_state->dpll_hw_state, 0,
 	       sizeof(crtc_state->dpll_hw_state));