From: Li Jun <jun.li@freescale.com>
Date: Fri, 27 Mar 2015 11:43:01 +0000 (+0800)
Subject: usb: chipidea: debug: add low power mode check before print registers
X-Git-Tag: firefly_0821_release~176^2~2000^2~2^2
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=0c4d6af42d8375e003f0e4626f2f661862b5df4b;p=firefly-linux-kernel-4.4.55.git

usb: chipidea: debug: add low power mode check before print registers

Since the required clock to access registers is gated off in low power mode,
add ci->in_lpm check before try to dump registers value.

Signed-off-by: Li Jun <jun.li@freescale.com>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
---

diff --git a/drivers/usb/chipidea/debug.c b/drivers/usb/chipidea/debug.c
index 268e4236e84c..dfb05edcdb96 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);