Some boards fail in magnetometer probe if level shifter flag is not set,
definition was found in the vendor Linux kernel v3.0.
Signed-off-by: Andreas Kemnade <andreas@xxxxxxxxxxxx>
Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
---
drivers/iio/imu/inv_mpu6050/inv_mpu_aux.c | 13 +++++++++++++
drivers/iio/imu/inv_mpu6050/inv_mpu_core.c | 3 +++
drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h | 1 +
3 files changed, 17 insertions(+)
diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_aux.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_aux.c
index 7327e5723f961..8a7f2911905af 100644
--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_aux.c
+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_aux.c
@@ -71,6 +71,19 @@ int inv_mpu_aux_init(const struct inv_mpu6050_state *st)
unsigned int val;
int ret;
+ /*
+ * Code based on the vendor Linux kernel v3.0,
+ * the exact meaning is unknown.
+ */
+ if (st->chip_type == INV_MPU9150) {
+ unsigned int mask = BIT(7);
+
+ val = st->level_shifter ? mask : 0;
+ ret = regmap_update_bits(st->map, 0x1, mask, val);
+ if (ret)
+ return ret;
+ }
+
/* configure i2c master */
val = INV_MPU6050_BITS_I2C_MST_CLK_400KHZ |
INV_MPU6050_BIT_WAIT_FOR_ES;
diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
index 29f906c884bd8..3fbeef1a70186 100644
--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
@@ -17,6 +17,7 @@
#include <linux/regulator/consumer.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
+#include <linux/property.h>
#include <linux/iio/common/inv_sensors_timestamp.h>
#include <linux/iio/iio.h>
@@ -1495,6 +1496,8 @@ int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name,
st->irq = irq;
st->map = regmap;
+ st->level_shifter = device_property_read_bool(dev,
+ "invensense,level-shifter");
pdata = dev_get_platdata(dev);
if (!pdata) {
result = iio_read_mount_matrix(dev, &st->orientation);
diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h b/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h
index ed5a96e78df05..7eba1439c8093 100644
--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h
+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h
@@ -203,6 +203,7 @@ struct inv_mpu6050_state {
s32 magn_raw_to_gauss[3];
struct iio_mount_matrix magn_orient;
unsigned int suspended_sensors;
+ bool level_shifter;
u8 *data;
};
--
2.39.2
