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authorMichael Grzeschik <m.grzeschik@pengutronix.de>2017-10-17 17:30:25 +0200
committerWim Van Sebroeck <wim@iguana.be>2017-12-28 20:45:07 +0100
commitf31b2a9bdeaea38957f4675ee0d1b8421595dc67 (patch)
tree184f6de3cedaf9d238bddf88558cfe364e2e2608 /drivers/watchdog
parent540f635192bb222f252724f70b9240d17742f1b1 (diff)
watchdog: da9062: Disable and wait before changing timeout
The DA9062 watchdog occasionally enters error condition and resets the system if the timeout is changed quickly after the timer was enabled. The method of disabling and waiting for > 150 ┬Ás before setting the new timeout is taken from the DA9052 driver. Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Diffstat (limited to 'drivers/watchdog')
-rw-r--r--drivers/watchdog/da9062_wdt.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/watchdog/da9062_wdt.c b/drivers/watchdog/da9062_wdt.c
index 4349a0221548..dbb970e87d3d 100644
--- a/drivers/watchdog/da9062_wdt.c
+++ b/drivers/watchdog/da9062_wdt.c
@@ -100,6 +100,13 @@ static int da9062_wdt_update_timeout_register(struct da9062_watchdog *wdt,
if (ret)
return ret;
+ regmap_update_bits(chip->regmap,
+ DA9062AA_CONTROL_D,
+ DA9062AA_TWDSCALE_MASK,
+ DA9062_TWDSCALE_DISABLE);
+
+ usleep_range(150, 300);
+
return regmap_update_bits(chip->regmap,
DA9062AA_CONTROL_D,
DA9062AA_TWDSCALE_MASK,

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