linux-kernel - [OVERWRITE] mfd: rtsx_usb: Defer autosuspend while card exists

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Message-ID: <1421834961-5829-1-git-send-email-rogerable@realtek.com>
Date:	Wed, 21 Jan 2015 18:09:21 +0800
From:	Roger Tseng <rogerable@...ltek.com>
To:	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>
CC:	<linux-kernel@...r.kernel.org>, <wei_wang@...lsil.com.cn>,
	<micky_ching@...lsil.com.cn>, Roger Tseng <rogerable@...ltek.com>
Subject: [OVERWRITE] mfd: rtsx_usb: Defer autosuspend while card exists

A card insertion happens after the lastest polling before reader is
suspended may never have a chance to be detected. Under current 1-HZ
polling interval setting in mmc_core, the worst case of such
undetectablility is about 1 second.

To further reduce the undetectability, detect card slot again in suspend
method and defer the autosuspend if the slot is loaded. The default 2
second autosuspend delay of USB subsystem should let the next polling
detects the card.

Signed-off-by: Roger Tseng <rogerable@...ltek.com>
---
 drivers/mfd/rtsx_usb.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/mfd/rtsx_usb.c b/drivers/mfd/rtsx_usb.c
index 210d1f85679e..ede50244f265 100644
--- a/drivers/mfd/rtsx_usb.c
+++ b/drivers/mfd/rtsx_usb.c
@@ -681,9 +681,27 @@ static void rtsx_usb_disconnect(struct usb_interface *intf)
 #ifdef CONFIG_PM
 static int rtsx_usb_suspend(struct usb_interface *intf, pm_message_t message)
 {
+	struct rtsx_ucr *ucr =
+		(struct rtsx_ucr *)usb_get_intfdata(intf);
+	u16 val = 0;
+
 	dev_dbg(&intf->dev, "%s called with pm message 0x%04x\n",
 			__func__, message.event);
 
+	if (PMSG_IS_AUTO(message)) {
+		if (mutex_trylock(&ucr->dev_mutex)) {
+			rtsx_usb_get_card_status(ucr, &val);
+			mutex_unlock(&ucr->dev_mutex);
+
+			/* Defer the autosuspend if card exists */
+			if (val & (SD_CD | MS_CD))
+				return -EAGAIN;
+		} else {
+			/* There is an ongoing operation*/
+			return -EAGAIN;
+		}
+	}
+
 	return 0;
 }
 
-- 
2.1.3

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