drm/xe: Fix MOCS debugfs LNCF readout

With only XE_FW_GT taken LNCF registers read back as all zeroes, leading
to a wild goose chase trying to figure out why is register programming
incorrect.

Fix it by grabbing XE_FORCEWAKE_ALL for affected platforms.

Signed-off-by: Tvrtko Ursulin <[email protected]>
Reviewed-by: Rodrigo Vivi <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Signed-off-by: Rodrigo Vivi <[email protected]>
(cherry picked from commit 1182bc7)
Signed-off-by: Lucas De Marchi <[email protected]>

Author: Tvrtko Ursulin

drivers/gpu/drm/xe/xe_mocs.c

@@ -781,7 +781,9 @@ void xe_mocs_dump(struct xe_gt *gt, struct drm_printer *p)
 	flags = get_mocs_settings(xe, &table);
 
 	xe_pm_runtime_get_noresume(xe);
-	fw_ref = xe_force_wake_get(gt_to_fw(gt), XE_FW_GT);
+	fw_ref = xe_force_wake_get(gt_to_fw(gt),
+				   flags & HAS_LNCF_MOCS ?
+				   XE_FORCEWAKE_ALL : XE_FW_GT);
 	if (!fw_ref)
 		goto err_fw;