mfd: rtsx_usb: Add comment in rtsx_usb_suspend

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>

diff --git a/drivers/mfd/rtsx_usb.c b/drivers/mfd/rtsx_usb.c
index 0ca79736afe9f09116389f142b2f322e0fdef580..141ea52c46e3affedc153b2c00e8640d111fb144 100644 (file)
--- a/drivers/mfd/rtsx_usb.c
+++ b/drivers/mfd/rtsx_usb.c
@@ -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;
 }