watchdog: iTCO_wdt: No need to stop the timer in probe

The watchdog core can handle pinging of the watchdog before userspace
opens the device. For this reason instead of stopping the timer, just
mark it as running and let the watchdog core take care of it.

Cc: Malin Jonsson <malin.jonsson@ericsson.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20210921102900.61586-1-mika.westerberg@linux.intel.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

diff --git a/drivers/watchdog/iTCO_wdt.c b/drivers/watchdog/iTCO_wdt.c
index 16ad2c9842c262ad1b2011dc7829fff402041f5b..3f2f4343644f562124bd353e3943968b602b5dcb 100644 (file)
--- a/drivers/watchdog/iTCO_wdt.c
+++ b/drivers/watchdog/iTCO_wdt.c
@@ -423,6 +423,16 @@ static unsigned int iTCO_wdt_get_timeleft(struct watchdog_device *wd_dev)
        return time_left;
 }
 
+static void iTCO_wdt_set_running(struct iTCO_wdt_private *p)
+{
+       u16 val;
+
+       /* Bit 11: TCO Timer Halt -> 0 = The TCO timer is * enabled */
+       val = inw(TCO1_CNT(p));
+       if (!(val & BIT(11)))
+               set_bit(WDOG_HW_RUNNING, &p->wddev.status);
+}
+
 /*
  *     Kernel Interfaces
  */
@@ -562,8 +572,7 @@ static int iTCO_wdt_probe(struct platform_device *pdev)
        watchdog_set_drvdata(&p->wddev, p);
        platform_set_drvdata(pdev, p);
 
-       /* Make sure the watchdog is not running */
-       iTCO_wdt_stop(&p->wddev);
+       iTCO_wdt_set_running(p);
 
        /* Check that the heartbeat value is within it's range;
           if not reset to the default */