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authorSlaveyko Slaveykov <sis@melexis.com>2020-12-16 14:57:20 +0300
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2021-01-14 23:56:55 +0300
commitcf5b1385d748b2f91b0c05bb301fcaf9bdbad385 (patch)
treef48907978361d1ef719196deb3989bdf1c5d68b9 /drivers/iio
parent7e6d9788aa02333a4353058816d52b9a90aae0d3 (diff)
downloadlinux-cf5b1385d748b2f91b0c05bb301fcaf9bdbad385.tar.xz
drivers: iio: temperature: Add delay after the addressed reset command in mlx90632.c
After an I2C reset command, the mlx90632 needs some time before responding to other I2C commands. Without that delay, there is a chance that the I2C command(s) after the reset will not be accepted. Signed-off-by: Slaveyko Slaveykov <sis@melexis.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Reviewed-by: Crt Mori <cmo@melexis.com> Fixes: e02472f74a81 ("iio:temperature:mlx90632: Adding extended calibration option") Link: https://lore.kernel.org/r/20201216115720.12404-2-sis@melexis.com Cc: <Stable@vger.kernel.org> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio')
-rw-r--r--drivers/iio/temperature/mlx90632.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/iio/temperature/mlx90632.c b/drivers/iio/temperature/mlx90632.c
index 503fe54a0bb9..608ccb1d8bc8 100644
--- a/drivers/iio/temperature/mlx90632.c
+++ b/drivers/iio/temperature/mlx90632.c
@@ -248,6 +248,12 @@ static int mlx90632_set_meas_type(struct regmap *regmap, u8 type)
if (ret < 0)
return ret;
+ /*
+ * Give the mlx90632 some time to reset properly before sending a new I2C command
+ * if this is not done, the following I2C command(s) will not be accepted.
+ */
+ usleep_range(150, 200);
+
ret = regmap_write_bits(regmap, MLX90632_REG_CONTROL,
(MLX90632_CFG_MTYP_MASK | MLX90632_CFG_PWR_MASK),
(MLX90632_MTYP_STATUS(type) | MLX90632_PWR_STATUS_HALT));