linux-kernel - [PATCH v7 2/4] [v6 fix] mfd/rtsx_usb: add comment in rtsx_usb

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Message-ID: <1397199203-2235-3-git-send-email-rogerable@realtek.com>
Date:	Fri, 11 Apr 2014 14:53:21 +0800
From:	<rogerable@...ltek.com>
To:	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Chris Ball <chris@...ntf.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	Alex Dubov <oakad@...oo.com>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Oliver Neukum <oneukum@...e.de>
CC:	<rogerable@...ltek.com>, <linux-kernel@...r.kernel.org>,
	<linux-mmc@...r.kernel.org>,
	<driverdev-devel@...uxdriverproject.org>,
	<wei_wang@...lsil.com.cn>, <micky_ching@...lsil.com.cn>
Subject: [PATCH v7 2/4] [v6 fix] mfd/rtsx_usb: add comment in rtsx_usb_suspend

From: Roger Tseng <rogerable@...ltek.com>

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@...ltek.com>
---
 drivers/mfd/rtsx_usb.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/mfd/rtsx_usb.c b/drivers/mfd/rtsx_usb.c
index 0ca7973..141ea52 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;
 }
 
-- 
1.8.2

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