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mfd: rtsx_usb: Add comment in rtsx_usb_suspend

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Explain why there is no need to have a symmetric LED turn-on in resume handler
while calling rtsx_usb_turn_off_led() in suspend handler.

Signed-off-by: Roger Tseng <rogerable@realtek.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Roger Tseng 2014-04-11 14:53:21 +08:00 committed by Lee Jones
parent fea52b8910
commit 5f03342052
1 changed files with 6 additions and 0 deletions
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6
drivers/mfd/rtsx_usb.c
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@ -687,9 +687,15 @@ static int rtsx_usb_suspend(struct usb_interface *intf, pm_message_t message)
dev_dbg(&intf->dev, "%s called with pm message 0x%04u\n",
__func__, message.event);
/*
* Call to make sure LED is off during suspend to save more power.
* It is NOT a permanent state and could be turned on anytime later.
* Thus no need to call turn_on when resunming.
*/
mutex_lock(&ucr->dev_mutex);
rtsx_usb_turn_off_led(ucr);
mutex_unlock(&ucr->dev_mutex);
return 0;
}