drm/i915/selftests: Flush all tiles on test exit

We want to idle all tiles when exiting selftests.

Cc: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Nirmoy Das <nirmoy.das@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Signed-off-by: Andi Shyti <andi.shyti@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230125100003.18243-1-nirmoy.das@intel.com

drivers/gpu/drm/i915/selftests/igt_flush_test.c

@@ -14,8 +14,13 @@
 
 int igt_flush_test(struct drm_i915_private *i915)
 {
-	struct intel_gt *gt = to_gt(i915);
-	int ret = intel_gt_is_wedged(gt) ? -EIO : 0;
+	struct intel_gt *gt;
+	unsigned int i;
+	int ret = 0;
+
+	for_each_gt(gt, i915, i) {
+		if (intel_gt_is_wedged(gt))
+			ret = -EIO;
 
 		cond_resched();
 
@@ -30,6 +35,7 @@ int igt_flush_test(struct drm_i915_private *i915)
 			intel_gt_set_wedged(gt);
 			ret = -EIO;
 		}
+	}
 
 	return ret;
 }