diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index 5d8981c..5075407 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -208,7 +208,8 @@
 	reg = hw_read(ci, CAP_HCCPARAMS, HCCPARAMS_LEN) >>
 		__ffs(HCCPARAMS_LEN);
 	ci->hw_bank.lpm  = reg;
-	hw_alloc_regmap(ci, !!reg);
+	if (reg)
+		hw_alloc_regmap(ci, !!reg);
 	ci->hw_bank.size = ci->hw_bank.op - ci->hw_bank.abs;
 	ci->hw_bank.size += OP_LAST;
 	ci->hw_bank.size /= sizeof(u32);