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>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/mfd/rtsx_usb.c b/drivers/mfd/rtsx_usb.c
index 0ca79736afe9..141ea52c46e3 100644
--- 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;
 }