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authorDoug Anderson <dianders@chromium.org>2015-01-28 01:25:17 +0300
committerWim Van Sebroeck <wim@iguana.be>2015-02-17 23:33:49 +0300
commitb5ade9bc8dca839fb06cd2788046cfe923c06980 (patch)
tree1686491b894f9d2a47bdc02078ecd7910da23040 /drivers/watchdog
parenta00850107eb050bf6427a8f3a0445bce9441b5df (diff)
downloadlinux-b5ade9bc8dca839fb06cd2788046cfe923c06980.tar.xz
watchdog: dw_wdt: Try to get a 30 second watchdog by default
The dw_wdt_set_top() function takes in a value in seconds. In dw_wdt_open() we were calling it with a value that's supposed to represent the maximum value programmed into the "top" register with a comment saying that we were trying to set the watchdog to its maximum value. Instead we ended up setting the watchdog to ~15 seconds. Let's fix this. However, setting things to the "max" gives me an 86 second watchdog in the system I'm looking at. 86 seconds feels a little too long. We'll explicitly choose 30 seconds as a more reasonable value. NOTE: Ideally this driver should be transitioned to be a real watchdog driver. Then we could use "watchdog_init_timeout" and let the timeout be specified in a number of ways (device tree, module parameter, etc). This patch should be considered a bit of a stopgap solution. Signed-off-by: Doug Anderson <dianders@chromium.org> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Diffstat (limited to 'drivers/watchdog')
-rw-r--r--drivers/watchdog/dw_wdt.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/watchdog/dw_wdt.c b/drivers/watchdog/dw_wdt.c
index 3dde6de117fa..d0bb9499d12c 100644
--- a/drivers/watchdog/dw_wdt.c
+++ b/drivers/watchdog/dw_wdt.c
@@ -51,6 +51,8 @@
/* The maximum TOP (timeout period) value that can be set in the watchdog. */
#define DW_WDT_MAX_TOP 15
+#define DW_WDT_DEFAULT_SECONDS 30
+
static bool nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, bool, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
@@ -179,9 +181,9 @@ static int dw_wdt_open(struct inode *inode, struct file *filp)
if (!dw_wdt_is_enabled()) {
/*
* The watchdog is not currently enabled. Set the timeout to
- * the maximum and then start it.
+ * something reasonable and then start it.
*/
- dw_wdt_set_top(DW_WDT_MAX_TOP);
+ dw_wdt_set_top(DW_WDT_DEFAULT_SECONDS);
writel(WDOG_CONTROL_REG_WDT_EN_MASK,
dw_wdt.regs + WDOG_CONTROL_REG_OFFSET);
}