drm/xe: move disable_c6 call

disable c6 called in guc_pc_fini_hw is unreachable.

GuC PC init returns earlier if skip_guc_pc is true and never
registers the finish call thus making disable_c6 unreachable.

move this call to gt idle.

v2: rebase
v3: add fixes tag (Himal)

Fixes: 975e4a3 ("drm/xe: Manually setup C6 when skip_guc_pc is set")
Signed-off-by: Riana Tauro <riana.tauro@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240606100842.956072-3-riana.tauro@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
(cherry picked from commit 6800e63)
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>

Author: rtauro1895

drivers/gpu/drm/xe/xe_gt_idle.c

@@ -147,6 +147,13 @@ static const struct attribute *gt_idle_attrs[] = {
 static void gt_idle_sysfs_fini(struct drm_device *drm, void *arg)
 {
 	struct kobject *kobj = arg;
+	struct xe_gt *gt = kobj_to_gt(kobj->parent);
+
+	if (gt_to_xe(gt)->info.skip_guc_pc) {
+		XE_WARN_ON(xe_force_wake_get(gt_to_fw(gt), XE_FW_GT));
+		xe_gt_idle_disable_c6(gt);
+		xe_force_wake_put(gt_to_fw(gt), XE_FW_GT);
+	}
 
 	sysfs_remove_files(kobj, gt_idle_attrs);
 	kobject_put(kobj);

drivers/gpu/drm/xe/xe_guc_pc.c

@@ -895,12 +895,6 @@ int xe_guc_pc_stop(struct xe_guc_pc *pc)
 static void xe_guc_pc_fini(struct drm_device *drm, void *arg)
 {
 	struct xe_guc_pc *pc = arg;
-	struct xe_device *xe = pc_to_xe(pc);
-
-	if (xe->info.skip_guc_pc) {
-		xe_gt_idle_disable_c6(pc_to_gt(pc));
-		return;
-	}
 
 	XE_WARN_ON(xe_force_wake_get(gt_to_fw(pc_to_gt(pc)), XE_FORCEWAKE_ALL));
 	XE_WARN_ON(xe_guc_pc_gucrc_disable(pc));