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iio: imu: inv_mpu6050: add all signal path resets at init

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Old chips using spi require for a full reset to manually reset
all signal path. This does not harm when using i2c so do it
inconditionally. Exclude i2c only chips.

Signed-off-by: Jean-Baptiste Maneyrol <jmaneyrol@invensense.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Jean-Baptiste Maneyrol 2020-02-19 15:39:51 +01:00 committed by Jonathan Cameron
parent 5621a63a01
commit c1bfe9c818
2 changed files with 24 additions and 0 deletions
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18
drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
View File

@ -1146,6 +1146,24 @@ static int inv_check_and_setup_chip(struct inv_mpu6050_state *st)
if (result)
return result;
msleep(INV_MPU6050_POWER_UP_TIME);
switch (st->chip_type) {
case INV_MPU6000:
case INV_MPU6500:
case INV_MPU6515:
case INV_MPU9250:
case INV_MPU9255:
/* reset signal path (required for spi connection) */
regval = INV_MPU6050_BIT_TEMP_RST | INV_MPU6050_BIT_ACCEL_RST |
INV_MPU6050_BIT_GYRO_RST;
result = regmap_write(st->map, INV_MPU6050_REG_SIGNAL_PATH_RESET,
regval);
if (result)
return result;
msleep(INV_MPU6050_POWER_UP_TIME);
break;
default:
break;
}
/*
* Turn power on. After reset, the sleep bit could be on

6
drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h
View File

@ -245,7 +245,13 @@ struct inv_mpu6050_state {
#define INV_MPU6050_BIT_I2C_SLV3_DLY_EN 0x08
#define INV_MPU6050_BIT_DELAY_ES_SHADOW 0x80
#define INV_MPU6050_REG_SIGNAL_PATH_RESET 0x68
#define INV_MPU6050_BIT_TEMP_RST BIT(0)
#define INV_MPU6050_BIT_ACCEL_RST BIT(1)
#define INV_MPU6050_BIT_GYRO_RST BIT(2)
#define INV_MPU6050_REG_USER_CTRL 0x6A
#define INV_MPU6050_BIT_SIG_COND_RST 0x01
#define INV_MPU6050_BIT_FIFO_RST 0x04
#define INV_MPU6050_BIT_DMP_RST 0x08
#define INV_MPU6050_BIT_I2C_MST_EN 0x20