From dfa07141e7a792aecf98a8a99dd40df0bf91bce2 Mon Sep 17 00:00:00 2001 From: Jisheng Zhang Date: Tue, 23 Sep 2014 15:42:11 +0800 Subject: [PATCH] watchdog: dw_wdt: initialise TOP_INIT in dw_wdt_set_top() The TOP_INIT, ie bit 4-7 of the WDOG_TIMEOUT_RANGE_REG_OFFSET register may be zero, so the timeout period may be very short after initialization is done, thus the system may be reset soon after enabling. We fix this problem by also initialising the TOP_INIT when setting TOP in function dw_wdt_set_top(). Signed-off-by: Jisheng Zhang Reviewed-by: Guenter Roeck Signed-off-by: Wim Van Sebroeck --- drivers/watchdog/dw_wdt.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/watchdog/dw_wdt.c b/drivers/watchdog/dw_wdt.c index 9f210299de24..449c88523364 100644 --- a/drivers/watchdog/dw_wdt.c +++ b/drivers/watchdog/dw_wdt.c @@ -40,6 +40,7 @@ #define WDOG_CONTROL_REG_OFFSET 0x00 #define WDOG_CONTROL_REG_WDT_EN_MASK 0x01 #define WDOG_TIMEOUT_RANGE_REG_OFFSET 0x04 +#define WDOG_TIMEOUT_RANGE_TOPINIT_SHIFT 4 #define WDOG_CURRENT_COUNT_REG_OFFSET 0x08 #define WDOG_COUNTER_RESTART_REG_OFFSET 0x0c #define WDOG_COUNTER_RESTART_KICK_VALUE 0x76 @@ -106,7 +107,8 @@ static int dw_wdt_set_top(unsigned top_s) } /* Set the new value in the watchdog. */ - writel(top_val, dw_wdt.regs + WDOG_TIMEOUT_RANGE_REG_OFFSET); + writel(top_val | top_val << WDOG_TIMEOUT_RANGE_TOPINIT_SHIFT, + dw_wdt.regs + WDOG_TIMEOUT_RANGE_REG_OFFSET); dw_wdt_set_next_heartbeat(); -- 2.20.1