On 05/27/2018 11:45 PM, Marco Felsch wrote:
The watchdog can be enabled in previous steps (e.g. the bootloader). Set
the driver default timeout value (8s) if the watchdog is already running
and the HW_RUNNING flag. So the watchdog core framework will ping the
watchdog till the user space activates the watchdog explicit with the
desired timeout value.
Fixes: 5e9c16e37608 ("watchdog: Add DA9063 PMIC watchdog driver.")
Signed-off-by: Marco Felsch <m.felsch@xxxxxxxxxxxxxx>
Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>
---
drivers/watchdog/da9063_wdt.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/drivers/watchdog/da9063_wdt.c b/drivers/watchdog/da9063_wdt.c
index 6b0092b7d5a6..a4380a887e85 100644
--- a/drivers/watchdog/da9063_wdt.c
+++ b/drivers/watchdog/da9063_wdt.c
@@ -45,6 +45,18 @@ static unsigned int da9063_wdt_timeout_to_sel(unsigned int secs)
return DA9063_TWDSCALE_MAX;
}
+/*
+ * Return 0 if watchdog is disabled, else non zero.
+ */
+static unsigned int da9063_wdt_is_running(struct da9063 *da9063)
+{
+ unsigned int val;
+
+ regmap_read(da9063->regmap, DA9063_REG_CONTROL_D, &val);
+
+ return val & DA9063_TWDSCALE_MASK;
+}
+
static int da9063_wdt_disable_timer(struct da9063 *da9063)
{
return regmap_update_bits(da9063->regmap, DA9063_REG_CONTROL_D,
@@ -206,6 +218,15 @@ static int da9063_wdt_probe(struct platform_device *pdev)
watchdog_set_drvdata(wdd, da9063);
+ /* Change the timeout to the default value if the watchdog is running */
+ if (da9063_wdt_is_running(da9063)) {
+ unsigned int timeout;
+
+ timeout = da9063_wdt_timeout_to_sel(DA9063_WDG_TIMEOUT);
+ _da9063_wdt_set_timeout(da9063, timeout);
+ set_bit(WDOG_HW_RUNNING, &wdd->status);
+ }
+
return devm_watchdog_register_device(&pdev->dev, wdd);
}
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