[U-Boot] [PATCH v2] MX31: Disable watchdog during low-power modes

[Fabio Estevam]

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 at freescale.com>
---
Changes since v1:
- Use setbits to configure wdog->wcr
- Change WDOG_WDZST definition style to (1 << 0)

 arch/arm/cpu/arm1136/mx31/timer.c         |    4 ++--
 arch/arm/include/asm/arch-mx31/imx-regs.h |    2 ++
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/arm/cpu/arm1136/mx31/timer.c b/arch/arm/cpu/arm1136/mx31/timer.c
index c05a39d..53d656a 100644
--- a/arch/arm/cpu/arm1136/mx31/timer.c
+++ b/arch/arm/cpu/arm1136/mx31/timer.c
@@ -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);
 }
 
 
diff --git a/arch/arm/include/asm/arch-mx31/imx-regs.h b/arch/arm/include/asm/arch-mx31/imx-regs.h
index 2064870..0dcd9fe 100644
--- a/arch/arm/include/asm/arch-mx31/imx-regs.h
+++ b/arch/arm/include/asm/arch-mx31/imx-regs.h
@@ -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 */
-- 
1.6.0.4