[Intel-gfx] [PATCH 1/2] drm/i915/display/tgl: Disable FBC with PSR2

[Uma Shankar]

There are some corner cases wrt underrun when we enable
FBC with PSR2 on TGL. Recommendation from hardware is to
keep this combination disabled.

Signed-off-by: Uma Shankar <uma.shankar at intel.com>
---
 drivers/gpu/drm/i915/display/intel_fbc.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c
index a5b072816a7b..32c411414908 100644
--- a/drivers/gpu/drm/i915/display/intel_fbc.c
+++ b/drivers/gpu/drm/i915/display/intel_fbc.c
@@ -799,6 +799,12 @@ static bool intel_fbc_can_activate(struct intel_crtc *crtc)
 	struct intel_fbc *fbc = &dev_priv->fbc;
 	struct intel_fbc_state_cache *cache = &fbc->state_cache;
 
+	if (dev_priv->psr.sink_psr2_support &&
+	    IS_TIGERLAKE(dev_priv)) {
+		fbc->no_fbc_reason = "not supported with PSR2";
+		return false;
+	}
+
 	if (!intel_fbc_can_enable(dev_priv))
 		return false;
 
-- 
2.26.2