We should not simple use "writew(WCR_WDE, &wdog->wcr)" to set wcr, since this will override bits set before reset_cpu.
Use clrsetbits_le32 instead of writew to fix this issue.
Signed-off-by: Peng Fan Peng.Fan@freescale.com Cc: Stefano Babic sbabic@denx.de Cc: Fabio Estevam fabio.estevam@freescale.com Cc: Sebastian Siewior bigeasy@linutronix.de --- drivers/watchdog/imx_watchdog.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/watchdog/imx_watchdog.c b/drivers/watchdog/imx_watchdog.c index 1d18d4b..9a77a54 100644 --- a/drivers/watchdog/imx_watchdog.c +++ b/drivers/watchdog/imx_watchdog.c @@ -55,7 +55,8 @@ void reset_cpu(ulong addr) { struct watchdog_regs *wdog = (struct watchdog_regs *)WDOG1_BASE_ADDR;
- writew(WCR_WDE, &wdog->wcr); + clrsetbits_le16(&wdog->wcr, 0, WCR_WDE); + writew(0x5555, &wdog->wsr); writew(0xaaaa, &wdog->wsr); /* load minimum 1/2 second timeout */ while (1) {