From: Ville Syrjälä ville.syrjala@linux.intel.com

We're missing a workaround in the fbc code for all glk+ platforms which can cause corruption around the top of the screen. So enabling fbc by default is a bad idea. I'm not keen to backport the w/a so let's start by disabling fbc by default on all glk+. We'll lift the restriction once the w/a is in place.

Cc: stable@vger.kernel.org Cc: Daniel Drake drake@endlessm.com Cc: Paulo Zanoni paulo.r.zanoni@intel.com Cc: Jian-Hong Pan jian-hong@endlessm.com Cc: Maarten Lankhorst maarten.lankhorst@linux.intel.com Signed-off-by: Ville Syrjälä ville.syrjala@linux.intel.com --- drivers/gpu/drm/i915/display/intel_fbc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c index 92c7eb243559..3cc1f4b4b5a3 100644 --- a/drivers/gpu/drm/i915/display/intel_fbc.c +++ b/drivers/gpu/drm/i915/display/intel_fbc.c @@ -1284,7 +1284,7 @@ static int intel_sanitize_fbc_option(struct drm_i915_private *dev_priv) return 0;

/* https://bugs.freedesktop.org/show_bug.cgi?id=108085 */ - if (IS_GEMINILAKE(dev_priv)) + if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv)) return 0;

if (IS_BROADWELL(dev_priv) || INTEL_GEN(dev_priv) >= 9)