This is a note to let you know that I've just added the patch titled
drivers: iio: temperature: Add delay after the addressed reset
to my staging git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git
in the staging-linus branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.
If you have any questions about this process, please let me know.
>From cf5b1385d748b2f91b0c05bb301fcaf9bdbad385 Mon Sep 17 00:00:00 2001
From: Slaveyko Slaveykov <sis@xxxxxxxxxxx>
Date: Wed, 16 Dec 2020 13:57:20 +0200
Subject: 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@xxxxxxxxxxx>
Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
Reviewed-by: Crt Mori <cmo@xxxxxxxxxxx>
Fixes: e02472f74a81 ("iio:temperature:mlx90632: Adding extended calibration option")
Link: https://lore.kernel.org/r/20201216115720.12404-2-sis@xxxxxxxxxxx
Cc: <Stable@xxxxxxxxxxxxxxx>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
---
drivers/iio/temperature/mlx90632.c | 6 ++++++
1 file changed, 6 insertions(+)
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));
--
2.30.0
