diff --git a/drivers/usb/chipidea/debug.c b/drivers/usb/chipidea/debug.c
index 268e4236e84cfd51ecd9748af71fc772f196666b..dfb05edcdb96dbbb3b794d6faf5c799b3c031f06 100644
--- a/drivers/usb/chipidea/debug.c
+++ b/drivers/usb/chipidea/debug.c
@@ -336,8 +336,8 @@ static int ci_registers_show(struct seq_file *s, void *unused)
 	struct ci_hdrc *ci = s->private;
 	u32 tmp_reg;
 
-	if (!ci)
-		return 0;
+	if (!ci || ci->in_lpm)
+		return -EPERM;
 
 	/* ------ Registers ----- */
 	tmp_reg = hw_read_intr_enable(ci);