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 268e4236e84cfd51ecd9748af71fc772f196666b..dfb05edcdb96dbbb3b794d6faf5c799b3c031f06 100644 (file)
--- 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);