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>

drivers/gpu/drm/xe/xe_gt_idle.c

@@ -197,6 +197,12 @@ static void gt_idle_fini(void *arg)
 
 	xe_gt_idle_disable_pg(gt);
 
+	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

@@ -897,11 +897,6 @@ static void xe_guc_pc_fini_hw(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;
-	}
-
 	if (xe_device_wedged(xe))
 		return;