[PATCH 2/2] drm/xe: make change ccs_mode a synchronous action

[Maciej Patelczyk <maciej.patelczyk@intel.com>]

If ccs_mode is being modified via
   /sys/class/drm/cardX/device/tileY/gtY/ccs_mode
the asynchronous reset is triggered and the write returns immediately.

With that some test receive false information about number of CCS engines
or even fail if they proceed without delay after changing the ccs_mode.

Changing the ccs_mode change from async to sync to prevent failures in
tests.

Signed-off-by: Maciej Patelczyk <maciej.patelczyk@intel.com>
---
 drivers/gpu/drm/xe/xe_gt_ccs_mode.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/xe/xe_gt_ccs_mode.c b/drivers/gpu/drm/xe/xe_gt_ccs_mode.c
index b6adfb9f2030..8d02ec3f7d12 100644
--- a/drivers/gpu/drm/xe/xe_gt_ccs_mode.c
+++ b/drivers/gpu/drm/xe/xe_gt_ccs_mode.c
@@ -115,7 +115,7 @@ ccs_mode_store(struct device *kdev, struct device_attribute *attr,
 	struct xe_gt *gt = kobj_to_gt(&kdev->kobj);
 	struct xe_device *xe = gt_to_xe(gt);
 	u32 num_engines, num_slices;
-	int ret;
+	int mode_changed = 0, ret;
 
 	if (IS_SRIOV(xe)) {
 		xe_gt_dbg(gt, "Can't change compute mode when running as %s\n",
@@ -151,10 +151,14 @@ ccs_mode_store(struct device *kdev, struct device_attribute *attr,
 		gt->ccs_mode = num_engines;
 		xe_gt_record_user_engines(gt);
 		xe_gt_reset_async(gt);
+		mode_changed = 1;
 	}
 
 	mutex_unlock(&xe->drm.filelist_mutex);
 
+	if (mode_changed)
+		xe_gt_reset_wait(gt);
+
 	return count;
 }
 
-- 
2.43.0