[Intel-gfx] [PATCH v4 2/2] drm/i915/lnl: FBC is supported with per pixel alpha

[Vinod Govindapillai]

For LNL onwards, FBC can be supported on planes with per
pixel alpha

Bspec: 69560
Signed-off-by: Vinod Govindapillai <vinod.govindapillai at intel.com>
---
 drivers/gpu/drm/i915/display/intel_fbc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c
index a3999ad95a19..c0e4caec03ea 100644
--- a/drivers/gpu/drm/i915/display/intel_fbc.c
+++ b/drivers/gpu/drm/i915/display/intel_fbc.c
@@ -1209,7 +1209,8 @@ static int intel_fbc_check_plane(struct intel_atomic_state *state,
 		return 0;
 	}
 
-	if (plane_state->hw.pixel_blend_mode != DRM_MODE_BLEND_PIXEL_NONE &&
+	if (DISPLAY_VER(i915) < 20 &&
+	    plane_state->hw.pixel_blend_mode != DRM_MODE_BLEND_PIXEL_NONE &&
 	    fb->format->has_alpha) {
 		plane_state->no_fbc_reason = "per-pixel alpha not supported";
 		return 0;
-- 
2.34.1