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watchdog: da9062: Disable and wait before changing timeout

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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 µs before setting the
new timeout is taken from the DA9052 driver.

Signed-off-by: Michael Grzeschik <[email protected]>
Reviewed-by: Guenter Roeck <[email protected]>
Signed-off-by: Guenter Roeck <[email protected]>
Signed-off-by: Wim Van Sebroeck <[email protected]>
This commit is contained in:
Michael Grzeschik 2017-10-17 17:30:25 +02:00 • committed by Wim Van Sebroeck
commit f31b2a9bde
1 changed files with 7 additions and 0 deletions
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7
drivers/watchdog/da9062_wdt.c
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@ -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,