From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> commit 0eb8e74f7202a4a98bbc0c1adeed3986cf50b66a upstream. 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@xxxxxxxxxxxxxxx Cc: Daniel Drake <drake@xxxxxxxxxxxx> Cc: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx> Cc: Jian-Hong Pan <jian-hong@xxxxxxxxxxxx> Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx> Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> Link: https://patchwork.freedesktop.org/patch/msgid/20191127201222.16669-2-ville.syrjala@xxxxxxxxxxxxxxx Reviewed-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx> (cherry picked from commit cd8c021b36a66833cefe2c90a79a9e312a2a5690) Signed-off-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/i915/display/intel_fbc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- 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(str 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)
