linux-kernel - [PATCH 5.10 113/199] drivers: iio: temperature: Add delay after the addressed reset command in mlx90632.c

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Message-Id: <20210125183221.014055630@linuxfoundation.org>
Date:   Mon, 25 Jan 2021 19:38:55 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Slaveyko Slaveykov <sis@...exis.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Crt Mori <cmo@...exis.com>, Stable@...r.kernel.org,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH 5.10 113/199] drivers: iio: temperature: Add delay after the addressed reset command in mlx90632.c

From: Slaveyko Slaveykov <sis@...exis.com>

commit cf5b1385d748b2f91b0c05bb301fcaf9bdbad385 upstream.

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@...exis.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
Reviewed-by: Crt Mori <cmo@...exis.com>
Fixes: e02472f74a81 ("iio:temperature:mlx90632: Adding extended calibration option")
Link: https://lore.kernel.org/r/20201216115720.12404-2-sis@melexis.com
Cc: <Stable@...r.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/iio/temperature/mlx90632.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/iio/temperature/mlx90632.c
+++ b/drivers/iio/temperature/mlx90632.c
@@ -248,6 +248,12 @@ static int mlx90632_set_meas_type(struct
 	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));