diff options
| -rw-r--r-- | drivers/iio/accel/kionix-kx022a.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/iio/accel/kionix-kx022a.c b/drivers/iio/accel/kionix-kx022a.c index 670bac21965b..65e3db9d8c3c 100644 --- a/drivers/iio/accel/kionix-kx022a.c +++ b/drivers/iio/accel/kionix-kx022a.c @@ -1121,10 +1121,15 @@ static int kx022a_chip_init(struct kx022a_data *data) return ret; /* - * I've seen I2C read failures if we poll too fast after the sensor - * reset. Slight delay gives I2C block the time to recover. + * According to the power-on procedure documents, there is (at least) + * 2ms delay required after the software reset. This should be same for + * all, KX022ACR-Z, KX132-1211, KX132ACR-LBZ and KX134ACR-LBZ. + * + * https://fscdn.rohm.com/kionix/en/document/AN010_KX022ACR-Z_Power-on_Procedure_E.pdf + * https://fscdn.rohm.com/kionix/en/document/TN027-Power-On-Procedure.pdf + * https://fscdn.rohm.com/kionix/en/document/AN011_KX134ACR-LBZ_Power-on_Procedure_E.pdf */ - msleep(1); + msleep(2); ret = regmap_read_poll_timeout(data->regmap, data->chip_info->cntl2, val, !(val & KX022A_MASK_SRST), |