From 1a9c5efa576eccadd2836a1e53dcea21f999c180 Mon Sep 17 00:00:00 2001 From: Anson Huang Date: Mon, 13 Jan 2014 19:58:34 +0800 Subject: watchdog: imx2_wdt: disable watchdog timer during low power mode We should set watchdog timer to be disabled in low power mode, as there is no service running in background, otherwise, system will reset unexpected. Signed-off-by: Anson Huang Acked-by: Shawn Guo Reviewed-by: Guenter Roeck Signed-off-by: Wim Van Sebroeck --- drivers/watchdog/imx2_wdt.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'drivers/watchdog') diff --git a/drivers/watchdog/imx2_wdt.c b/drivers/watchdog/imx2_wdt.c index b4786bccc42c..dd51d9539b33 100644 --- a/drivers/watchdog/imx2_wdt.c +++ b/drivers/watchdog/imx2_wdt.c @@ -2,6 +2,7 @@ * Watchdog driver for IMX2 and later processors * * Copyright (C) 2010 Wolfram Sang, Pengutronix e.K. + * Copyright (C) 2014 Freescale Semiconductor, Inc. * * some parts adapted by similar drivers from Darius Augulis and Vladimir * Zapolskiy, additional improvements by Wim Van Sebroeck. @@ -40,6 +41,7 @@ #define IMX2_WDT_WCR_WT (0xFF << 8) /* -> Watchdog Timeout Field */ #define IMX2_WDT_WCR_WRE (1 << 3) /* -> WDOG Reset Enable */ #define IMX2_WDT_WCR_WDE (1 << 2) /* -> Watchdog Enable */ +#define IMX2_WDT_WCR_WDZST (1 << 0) /* -> Watchdog timer Suspend */ #define IMX2_WDT_WSR 0x02 /* Service Register */ #define IMX2_WDT_SEQ1 0x5555 /* -> service sequence 1 */ @@ -87,6 +89,8 @@ static inline void imx2_wdt_setup(void) { u16 val = __raw_readw(imx2_wdt.base + IMX2_WDT_WCR); + /* Suspend timer in low power mode, write once-only */ + val |= IMX2_WDT_WCR_WDZST; /* Strip the old watchdog Time-Out value */ val &= ~IMX2_WDT_WCR_WT; /* Generate reset if WDOG times out */ -- cgit v1.2.1