[Intel-gfx] [PATCH v2 2/3] drm/i915/fbc: Make FBC check stolen at use time

[Jouni Högander]

As a preparation for Xe change stolen memory initialization check to be
done in use-time instead of during initialization.

In case of xe, stolen memory is initialised much later so it can't be
checked during init. There is no specific reason to check this in init for
i915 either -> perform the check in use-time. This also gives us benefit
fbc_no_reason reporting missing initialization being reason for disabled
fbc.

Signed-off-by: Jouni Högander <jouni.hogander at intel.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_fbc.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c
index a18e84efe911..da8166eedf93 100644
--- a/drivers/gpu/drm/i915/display/intel_fbc.c
+++ b/drivers/gpu/drm/i915/display/intel_fbc.c
@@ -1056,6 +1056,11 @@ static int intel_fbc_check_plane(struct intel_atomic_state *state,
 	if (!fbc)
 		return 0;
 
+	if (!i915_gem_stolen_initialized(i915)) {
+		plane_state->no_fbc_reason = "stolen memory not initialised";
+		return 0;
+	}
+
 	if (intel_vgpu_active(i915)) {
 		plane_state->no_fbc_reason = "VGPU active";
 		return 0;
@@ -1709,9 +1714,6 @@ void intel_fbc_init(struct drm_i915_private *i915)
 {
 	enum intel_fbc_id fbc_id;
 
-	if (!i915_gem_stolen_initialized(i915))
-		DISPLAY_RUNTIME_INFO(i915)->fbc_mask = 0;
-
 	if (need_fbc_vtd_wa(i915))
 		DISPLAY_RUNTIME_INFO(i915)->fbc_mask = 0;
 
-- 
2.34.1