From: Marco Felsch Date: Mon, 28 May 2018 06:45:46 +0000 (+0200) Subject: watchdog: da9063: Fix timeout handling during probe X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=be9e9c2ad52baea131a5395b15f52ae4f86bfbe3;p=linux.git watchdog: da9063: Fix timeout handling during probe 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 Reviewed-by: Guenter Roeck Signed-off-by: Guenter Roeck Signed-off-by: Wim Van Sebroeck --- diff --git a/drivers/watchdog/da9063_wdt.c b/drivers/watchdog/da9063_wdt.c index 6b0092b7d5a6e..a4380a887e855 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); }