drm/i915: Ignore OpRegion panel type except on select machines

[linux-2.6-block.git] / drivers / gpu / drm / i915 / intel_opregion.c

diff --git a/drivers/gpu/drm/i915/intel_opregion.c b/drivers/gpu/drm/i915/intel_opregion.c
index adca262d591ac02c46577ee05fa6741741433d41..7acbbbf97833a36cff79bc27b479a9791d5cc574 100644 (file)
--- a/drivers/gpu/drm/i915/intel_opregion.c
+++ b/drivers/gpu/drm/i915/intel_opregion.c
@@ -1047,6 +1047,23 @@ err_out:
        return err;
 }
 
+static int intel_use_opregion_panel_type_callback(const struct dmi_system_id *id)
+{
+       DRM_INFO("Using panel type from OpRegion on %s\n", id->ident);
+       return 1;
+}
+
+static const struct dmi_system_id intel_use_opregion_panel_type[] = {
+       {
+               .callback = intel_use_opregion_panel_type_callback,
+               .ident = "Conrac GmbH IX45GM2",
+               .matches = {DMI_MATCH(DMI_SYS_VENDOR, "Conrac GmbH"),
+                           DMI_MATCH(DMI_PRODUCT_NAME, "IX45GM2"),
+               },
+       },
+       { }
+};
+
 int
 intel_opregion_get_panel_type(struct drm_i915_private *dev_priv)
 {
@@ -1072,6 +1089,16 @@ intel_opregion_get_panel_type(struct drm_i915_private *dev_priv)
                return -ENODEV;
        }
 
+       /*
+        * So far we know that some machined must use it, others must not use it.
+        * There doesn't seem to be any way to determine which way to go, except
+        * via a quirk list :(
+        */
+       if (!dmi_check_system(intel_use_opregion_panel_type)) {
+               DRM_DEBUG_KMS("Ignoring OpRegion panel type (%d)\n", ret - 1);
+               return -ENODEV;
+       }
+
        /*
         * FIXME On Dell XPS 13 9350 the OpRegion panel type (0) gives us
         * low vswing for eDP, whereas the VBT panel type (2) gives us normal