IIO: BME280: Updates to Humidity readings need ctrl_reg write!

The ctrl_reg register needs to be written after any write to
the humidity registers. The value written to the ctrl_reg register
does not necessarily need to change, but a write operation must
occur.

The regmap_update_bits functions will not write to a register
if the register value matches the value to be written. This saves
unnecessary bus operations.  The change in this patch forces a bus
write during the chip_config operation by switching to
regmap_write_bits.

This will fix issues where the Humidity Sensor Oversampling bits
are not updated after initialization.

Signed-off-by: Colin Parker <colin.parker@aclima.io>
Acked-by: Andreas Klinger <ak@it-klinger.de>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/iio/pressure/bmp280-core.c b/drivers/iio/pressure/bmp280-core.c
index d82b788374b6..e442c5248427 100644
--- a/drivers/iio/pressure/bmp280-core.c
+++ b/drivers/iio/pressure/bmp280-core.c
@@ -558,7 +558,7 @@ static int bmp280_chip_config(struct bmp280_data *data)
         u8 osrs = BMP280_OSRS_TEMP_X(data->oversampling_temp + 1) |
                   BMP280_OSRS_PRESS_X(data->oversampling_press + 1);
 
-        ret = regmap_update_bits(data->regmap, BMP280_REG_CTRL_MEAS,
+        ret = regmap_write_bits(data->regmap, BMP280_REG_CTRL_MEAS,
                                  BMP280_OSRS_TEMP_MASK |
                                  BMP280_OSRS_PRESS_MASK |
                                  BMP280_MODE_MASK,