diff options
| author | Marco Felsch <m.felsch@pengutronix.de> | 2019-11-04 11:28:06 +0100 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2019-11-05 11:09:36 +0100 |
| commit | cbfdbf38c190bc9197f85c9633f103cdc15de571 (patch) | |
| tree | 5756177bdecf7d1d8c49cf42a74a14d4d1c2ee9f /drivers | |
| parent | 7d3b130af9d282e9a5b788bd44d1ad6528a3bde1 (diff) | |
| download | barebox-cbfdbf38c190bc9197f85c9633f103cdc15de571.tar.gz barebox-cbfdbf38c190bc9197f85c9633f103cdc15de571.tar.xz | |
mfd: da9063: fix watchdog ping execution
The watchdog resets the system if the watchdog gets pinged to fast.
Between each watchdog ping must be a pause of at least 200ms. This
commit fixes that by rejecting two fast requests.
Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mfd/da9063.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/mfd/da9063.c b/drivers/mfd/da9063.c index 7099c48703..e1343bac76 100644 --- a/drivers/mfd/da9063.c +++ b/drivers/mfd/da9063.c @@ -14,6 +14,7 @@ */ #include <common.h> +#include <clock.h> #include <driver.h> #include <gpio.h> #include <restart.h> @@ -33,6 +34,7 @@ struct da9063 { struct i2c_client *client1; struct device_d *dev; unsigned int timeout; + uint64_t last_ping; }; /* forbidden/impossible value; timeout will be set to this value initially to @@ -237,6 +239,14 @@ static int da9063_watchdog_ping(struct da9063 *priv) int ret; u8 val; + /* + * The watchdog has a cool down phase of 200ms and if we ping to fast + * the da9062/3 resets the system. Reject those requests has a maximum + * failure of 10% if the watchdog timeout is set to 2.048s. + */ + if (!is_timeout(priv->last_ping, 200 * MSECOND)) + return 0; + dev_dbg(priv->dev, "ping\n"); /* reset watchdog timer; register is self clearing */ @@ -245,6 +255,8 @@ static int da9063_watchdog_ping(struct da9063 *priv) if (ret < 0) return ret; + priv->last_ping = get_time_ns(); + return 0; } |