drm/i915: add eDP checking functions for the display code

The display code needs to distinguish between CPU and PCH attached eDP
panels, so add some helpers to handle that.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 714e553960fd..da71263f6fab 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -95,6 +95,25 @@ static struct intel_dp *intel_attached_dp(struct drm_connector *connector)
                             struct intel_dp, base);
 }
 
+/**
+ * intel_encoder_is_pch_edp - is the given encoder a PCH attached eDP?
+ * @encoder: DRM encoder
+ *
+ * Return true if @encoder corresponds to a PCH attached eDP panel.  Needed
+ * by intel_display.c.
+ */
+bool intel_encoder_is_pch_edp(struct drm_encoder *encoder)
+{
+        struct intel_dp *intel_dp;
+
+        if (!encoder)
+                return false;
+
+        intel_dp = enc_to_intel_dp(encoder);
+
+        return is_pch_edp(intel_dp);
+}
+
 static void intel_dp_start_link_train(struct intel_dp *intel_dp);
 static void intel_dp_complete_link_train(struct intel_dp *intel_dp);
 static void intel_dp_link_down(struct intel_dp *intel_dp);