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authorStefan Riedmueller <s.riedmueller@phytec.de>2020-04-03 15:07:27 +0200
committerWim Van Sebroeck <wim@linux-watchdog.org>2020-05-25 08:55:43 +0200
commitc4718308d77782bb438287f67a45ed9e9df712cf (patch)
treefc3b960bf805e5544b9041e7429fcecc4833ff19 /drivers/watchdog
parente8799ce85992defa341613c5c6f083fa412266f3 (diff)
watchdog: da9063: Make use of pre-configured timeout during probe
The watchdog might already be running during boot with a timeout set by e.g. the bootloader. Make use of this pre-configured timeout instead of falling back to the default timeout if no device tree value is given. Signed-off-by: Stefan Riedmueller <s.riedmueller@phytec.de> Reviewed-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Link: https://lore.kernel.org/r/20200403130728.39260-2-s.riedmueller@phytec.de Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
Diffstat (limited to 'drivers/watchdog')
-rw-r--r--drivers/watchdog/da9063_wdt.c20
1 files changed, 14 insertions, 6 deletions
diff --git a/drivers/watchdog/da9063_wdt.c b/drivers/watchdog/da9063_wdt.c
index 3d65e92a4e3f..423584252606 100644
--- a/drivers/watchdog/da9063_wdt.c
+++ b/drivers/watchdog/da9063_wdt.c
@@ -46,15 +46,16 @@ static unsigned int da9063_wdt_timeout_to_sel(unsigned int secs)
}
/*
- * Return 0 if watchdog is disabled, else non zero.
+ * Read the currently active timeout.
+ * Zero means the watchdog is disabled.
*/
-static unsigned int da9063_wdt_is_running(struct da9063 *da9063)
+static unsigned int da9063_wdt_read_timeout(struct da9063 *da9063)
{
unsigned int val;
regmap_read(da9063->regmap, DA9063_REG_CONTROL_D, &val);
- return val & DA9063_TWDSCALE_MASK;
+ return wdt_timeout[val & DA9063_TWDSCALE_MASK];
}
static int da9063_wdt_disable_timer(struct da9063 *da9063)
@@ -191,6 +192,7 @@ static int da9063_wdt_probe(struct platform_device *pdev)
struct device *dev = &pdev->dev;
struct da9063 *da9063;
struct watchdog_device *wdd;
+ unsigned int timeout;
if (!dev->parent)
return -EINVAL;
@@ -214,13 +216,19 @@ static int da9063_wdt_probe(struct platform_device *pdev)
watchdog_set_restart_priority(wdd, 128);
watchdog_set_drvdata(wdd, da9063);
- /* Set default timeout, maybe override it with DT value, scale it */
wdd->timeout = DA9063_WDG_TIMEOUT;
+
+ /* Use pre-configured timeout if watchdog is already running. */
+ timeout = da9063_wdt_read_timeout(da9063);
+ if (timeout)
+ wdd->timeout = timeout;
+
+ /* Set timeout, maybe override it with DT value, scale it */
watchdog_init_timeout(wdd, 0, dev);
da9063_wdt_set_timeout(wdd, wdd->timeout);
- /* Change the timeout to the default value if the watchdog is running */
- if (da9063_wdt_is_running(da9063)) {
+ /* Update timeout if the watchdog is already running. */
+ if (timeout) {
da9063_wdt_update_timeout(da9063, wdd->timeout);
set_bit(WDOG_HW_RUNNING, &wdd->status);
}