From f31b2a9bdeaea38957f4675ee0d1b8421595dc67 Mon Sep 17 00:00:00 2001 From: Michael Grzeschik Date: Tue, 17 Oct 2017 17:30:25 +0200 Subject: [PATCH] watchdog: da9062: Disable and wait before changing timeout MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Guenter Roeck Signed-off-by: Guenter Roeck Signed-off-by: Wim Van Sebroeck --- drivers/watchdog/da9062_wdt.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/watchdog/da9062_wdt.c b/drivers/watchdog/da9062_wdt.c index 4349a02..dbb970e 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, -- 2.7.4