drm/i915: Validate the mode for eDP by using fixed panel size

Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: stable@kernel.org
Signed-off-by: Eric Anholt <eric@anholt.net>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 233e6fd89328..40be1fa65be1 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -150,9 +150,21 @@ intel_dp_mode_valid(struct drm_connector *connector,
 {
         struct drm_encoder *encoder = intel_attached_encoder(connector);
         struct intel_encoder *intel_encoder = enc_to_intel_encoder(encoder);
+        struct intel_dp_priv *dp_priv = intel_encoder->dev_priv;
+        struct drm_device *dev = connector->dev;
+        struct drm_i915_private *dev_priv = dev->dev_private;
         int max_link_clock = intel_dp_link_clock(intel_dp_max_link_bw(intel_encoder));
         int max_lanes = intel_dp_max_lane_count(intel_encoder);
 
+        if ((IS_eDP(intel_encoder) || IS_PCH_eDP(dp_priv)) &&
+            dev_priv->panel_fixed_mode) {
+                if (mode->hdisplay > dev_priv->panel_fixed_mode->hdisplay)
+                        return MODE_PANEL;
+
+                if (mode->vdisplay > dev_priv->panel_fixed_mode->vdisplay)
+                        return MODE_PANEL;
+        }
+
         /* only refuse the mode on non eDP since we have seen some wierd eDP panels
            which are outside spec tolerances but somehow work by magic */
         if (!IS_eDP(intel_encoder) &&