[PATCH 06/11] drm/xe: Do not claim flat CCS without a graphics IP

[Stuart Summers <stuart.summers@intel.com>]

has_flat_ccs comes from the device descriptor rather than from the
graphics IP, so it survives a device whose graphics IP is absent.  It is
a graphics feature though, and probe_has_flat_ccs() reads its layout back
through the primary GT, which is not there.

Clear the flag along with the rest of the graphics feature bits.

Signed-off-by: Stuart Summers <stuart.summers@intel.com>
---
 drivers/gpu/drm/xe/xe_pci.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_pci.c b/drivers/gpu/drm/xe/xe_pci.c
index f2a4aed1dfe2..05aea5498a7b 100644
--- a/drivers/gpu/drm/xe/xe_pci.c
+++ b/drivers/gpu/drm/xe/xe_pci.c
@@ -1107,6 +1107,14 @@ static int xe_info_init(struct xe_device *xe,
 		xe->info.has_ctx_tlb_inval = graphics_desc->has_ctx_tlb_inval;
 		xe->info.has_usm = graphics_desc->has_usm;
 		xe->info.has_64bit_timestamp = graphics_desc->has_64bit_timestamp;
+	} else {
+		/*
+		 * Flat CCS comes from the device descriptor rather than from
+		 * the graphics IP, but it is still a graphics feature: its
+		 * layout is read back through the primary GT, which is not
+		 * there to be read.
+		 */
+		xe->info.has_flat_ccs = 0;
 	}
 
 	if (xe->info.platform != XE_PVC)
-- 
2.43.0