drm/i915: Fix LVDS fixed-mode regression from 219adae1

Commit 219adae1 cached the EDID found during LVDS init, but in the
process prevented the init routine from discovering the preferred
fixed-mode for the panel. This was causing us to guess the correct mode,
which sometimes is wide of the mark.

Reported-and-tested-by: Jon Masters <jonathan@jonmasters.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index f1a6499..4324a32 100644 (file)
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -481,11 +481,8 @@ static int intel_lvds_get_modes(struct drm_connector *connector)
        struct drm_device *dev = connector->dev;
        struct drm_display_mode *mode;
 
-       if (intel_lvds->edid) {
-               drm_mode_connector_update_edid_property(connector,
-                                                       intel_lvds->edid);
+       if (intel_lvds->edid)
                return drm_add_edid_modes(connector, intel_lvds->edid);
-       }
 
        mode = drm_mode_duplicate(dev, intel_lvds->fixed_mode);
        if (mode == 0)
@@ -939,7 +936,16 @@ void intel_lvds_init(struct drm_device *dev)
         */
        intel_lvds->edid = drm_get_edid(connector,
                                        &dev_priv->gmbus[pin].adapter);
-
+       if (intel_lvds->edid) {
+               if (drm_add_edid_modes(connector,
+                                      intel_lvds->edid)) {
+                       drm_mode_connector_update_edid_property(connector,
+                                                               intel_lvds->edid);
+               } else {
+                       kfree(intel_lvds->edid);
+                       intel_lvds->edid = NULL;
+               }
+       }
        if (!intel_lvds->edid) {
                /* Didn't get an EDID, so
                 * Set wide sync ranges so we get all modes