drm/i915: quirk away broken OpRegion VBT
Somehow the BIOS manages to screw things up when copying the VBT
around, because the one we scrap from the VBIOS rom actually works.
Cc: stable@kernel.org
Tested-by: Markus Heinz <markus.heinz@uni-dortmund.de>
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=28812
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
index 8168d8f..b48fc2a 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -24,6 +24,7 @@
* Eric Anholt <eric@anholt.net>
*
*/
+#include <linux/dmi.h>
#include <drm/drm_dp_helper.h>
#include "drmP.h"
#include "drm.h"
@@ -621,6 +622,26 @@
dev_priv->edp.bpp = 18;
}
+static int __init intel_no_opregion_vbt_callback(const struct dmi_system_id *id)
+{
+ DRM_DEBUG_KMS("Falling back to manually reading VBT from "
+ "VBIOS ROM for %s\n",
+ id->ident);
+ return 1;
+}
+
+static const struct dmi_system_id intel_no_opregion_vbt[] = {
+ {
+ .callback = intel_no_opregion_vbt_callback,
+ .ident = "ThinkCentre A57",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "97027RG"),
+ },
+ },
+ { }
+};
+
/**
* intel_parse_bios - find VBT and initialize settings from the BIOS
* @dev: DRM device
@@ -641,7 +662,7 @@
init_vbt_defaults(dev_priv);
/* XXX Should this validation be moved to intel_opregion.c? */
- if (dev_priv->opregion.vbt) {
+ if (!dmi_check_system(intel_no_opregion_vbt) && dev_priv->opregion.vbt) {
struct vbt_header *vbt = dev_priv->opregion.vbt;
if (memcmp(vbt->signature, "$VBT", 4) == 0) {
DRM_DEBUG_KMS("Using VBT from OpRegion: %20s\n",