From bb400d2120bd253d73661c452b18485d2d5b42dd Mon Sep 17 00:00:00 2001 From: Roger Tseng Date: Wed, 21 Jan 2015 18:09:21 +0800 Subject: 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 Signed-off-by: Lee Jones --- 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; } -- cgit v1.2.3