diff options
Diffstat (limited to 'drivers/watchdog/da9063_wdt.c')
| -rw-r--r-- | drivers/watchdog/da9063_wdt.c | 26 |
1 files changed, 24 insertions, 2 deletions
diff --git a/drivers/watchdog/da9063_wdt.c b/drivers/watchdog/da9063_wdt.c index b17ac1bb1f28..c1216e61e64e 100644 --- a/drivers/watchdog/da9063_wdt.c +++ b/drivers/watchdog/da9063_wdt.c @@ -45,8 +45,31 @@ static unsigned int da9063_wdt_timeout_to_sel(unsigned int secs) return DA9063_TWDSCALE_MAX; } +static int da9063_wdt_disable_timer(struct da9063 *da9063) +{ + return regmap_update_bits(da9063->regmap, DA9063_REG_CONTROL_D, + DA9063_TWDSCALE_MASK, + DA9063_TWDSCALE_DISABLE); +} + static int _da9063_wdt_set_timeout(struct da9063 *da9063, unsigned int regval) { + int ret; + + /* + * The watchdog triggers a reboot if a timeout value is already + * programmed because the timeout value combines two functions + * in one: indicating the counter limit and starting the watchdog. + * The watchdog must be disabled to be able to change the timeout + * value if the watchdog is already running. Then we can set the + * new timeout value which enables the watchdog again. + */ + ret = da9063_wdt_disable_timer(da9063); + if (ret) + return ret; + + usleep_range(150, 300); + return regmap_update_bits(da9063->regmap, DA9063_REG_CONTROL_D, DA9063_TWDSCALE_MASK, regval); } @@ -71,8 +94,7 @@ static int da9063_wdt_stop(struct watchdog_device *wdd) struct da9063 *da9063 = watchdog_get_drvdata(wdd); int ret; - ret = regmap_update_bits(da9063->regmap, DA9063_REG_CONTROL_D, - DA9063_TWDSCALE_MASK, DA9063_TWDSCALE_DISABLE); + ret = da9063_wdt_disable_timer(da9063); if (ret) dev_alert(da9063->dev, "Watchdog failed to stop (err = %d)\n", ret); |