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MX31: Disable watchdog during low-power modes

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Turn on the watchdog WDZST bit so that watchdog timer does not count during low power modes.

Prior to applying this patch mx31pdk board got watchdog resets because when it booted in the Linux prompt
and there was no activity, the system entered into idle mode while watchdog timer was still active.

Fix this by disabling watchdog timer during idle mode.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
This commit is contained in:
Fabio Estevam 2011-09-21 03:29:17 +00:00 • committed by Albert ARIBAUD
parent 419adbfbcb
commit 610b53e29b
2 changed files with 4 additions and 2 deletions
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4
arch/arm/cpu/arm1136/mx31/timer.c
View file

@ -173,8 +173,8 @@ void mxc_hw_watchdog_enable(void)
#else
secs = 64;
#endif
writew(readw(&wdog->wcr) | (secs << WDOG_WT_SHIFT) | WDOG_ENABLE,
&wdog->wcr);
setbits_le16(&wdog->wcr, (secs << WDOG_WT_SHIFT) | WDOG_ENABLE
| WDOG_WDZST);
}

2
arch/arm/include/asm/arch-mx31/imx-regs.h
View file

@ -71,6 +71,8 @@ struct cspi_regs {
/* Watchdog Timer (WDOG) registers */
#define WDOG_ENABLE (1 << 2)
#define WDOG_WT_SHIFT 8
#define WDOG_WDZST (1 << 0)
struct wdog_regs {
u16 wcr; /* Control */
u16 wsr; /* Service */