Customer report random display flicker issue on Nightfury board.
And we found this problem might be caused by VT-d and FBC are
both enabled. According to sighting report, it recommend to turn
drm/i915/fbc: disable FBC on Nightfury board
Customer report random display flicker issue on Nightfury board.
And we found this problem might be caused by VT-d and FBC are
both enabled. According to sighting report, it recommend to turn
FBC off to workaround this kind of issue.
This change refer to DMI BOARD_VENDOR and BOARD_NAME information
to disable FBC.
Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.v...@intel.com>
Cc: Mika Kuoppala <mika.kuopp...@linux.intel.com>
Cc: Jani Nikula <jani.nik...@intel.com>
Cc: William Tseng <william.ts...@intel.com>
Cc: Cooper Chiou <cooper.ch...@intel.com>
Signed-off-by: Lee Shawn C <shawn.c....@intel.com>
---
drivers/gpu/drm/i915/display/intel_fbc.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c
b/drivers/gpu/drm/i915/display/intel_fbc.c
index 327af428d73f..20660fdbab36 100644
--- a/drivers/gpu/drm/i915/display/intel_fbc.c
+++ b/drivers/gpu/drm/i915/display/intel_fbc.c
@@ -39,6 +39,7 @@
*/
#include <drm/drm_fourcc.h>
+#include <linux/dmi.h>
#include "i915_drv.h"
#include "i915_trace.h"
@@ -1439,6 +1440,24 @@ static int intel_sanitize_fbc_option(struct
drm_i915_private *dev_priv)
return 0;
}
+static int intel_fbc_vtd_callback(const struct dmi_system_id *id)
+{
+ DRM_DEBUG_KMS("Disabling FBC to prevent screen flicker on %s device\n",
id->ident);
+ return 1;
+}
+
+static const struct dmi_system_id intel_fbc_vtd_detect[] = {
+ {
+ .callback = intel_fbc_vtd_callback,
+ .ident = "Google Nightfury",
+ .matches = {
+ DMI_MATCH(DMI_BOARD_VENDOR, "Google"),
+ DMI_MATCH(DMI_BOARD_NAME, "Nightfury"),
+ },
+ },
+ { }
+};
+
static bool need_fbc_vtd_wa(struct drm_i915_private *dev_priv)
{
/* WaFbcTurnOffFbcWhenHyperVisorIsUsed:skl,bxt */
@@ -1450,6 +1469,9 @@ static bool need_fbc_vtd_wa(struct drm_i915_private
*dev_priv)
return true;
}
+ if (dmi_check_system(intel_fbc_vtd_detect))
+ return true;
+
return false;
}
--
2.17.1
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