usb: chipidea: Reallocate regmap only if lpm is detected

The regmap only needs to reallocate if the hw_read on the CAP register shows
lpm is used. Therefore the if() statement check the change.

Signed-off-by: Chris Ruehl <chris.ruehl@gtsys.com.hk>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/chipidea/core.c

@@ -208,7 +208,8 @@ static int hw_device_init(struct ci_hdrc *ci, void __iomem *base)
 	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);