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iio: imu: st_lsm6dsx: fix PM support for st_lsm6dsx i2c controller 

Properly suspend/resume i2c slaves connected to st_lsm6dsx master
controller if the CPU goes in suspended state

Fixes: c91c1c844e ("imu: st_lsm6dsx: add i2c embedded controller support")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Lorenzo Bianconi 2019-05-19 10:58:23 +02:00 committed by Jonathan Cameron
parent df4d737ee4
commit bce0d57db3
2 changed files with 19 additions and 8 deletions
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2
drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
View File

@ -271,6 +271,7 @@ struct st_lsm6dsx_sensor {
* @conf_lock: Mutex to prevent concurrent FIFO configuration update.
* @page_lock: Mutex to prevent concurrent memory page configuration.
* @fifo_mode: FIFO operating mode supported by the device.
* @suspend_mask: Suspended sensor bitmask.
* @enable_mask: Enabled sensor bitmask.
* @ts_sip: Total number of timestamp samples in a given pattern.
* @sip: Total number of samples (acc/gyro/ts) in a given pattern.
@ -288,6 +289,7 @@ struct st_lsm6dsx_hw {
struct mutex page_lock;
enum st_lsm6dsx_fifo_mode fifo_mode;
u8 suspend_mask;
u8 enable_mask;
u8 ts_sip;
u8 sip;

25
drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
View File

@ -1110,8 +1110,6 @@ static int __maybe_unused st_lsm6dsx_suspend(struct device *dev)
{
struct st_lsm6dsx_hw *hw = dev_get_drvdata(dev);
struct st_lsm6dsx_sensor *sensor;
const struct st_lsm6dsx_reg *reg;
unsigned int data;
int i, err = 0;
for (i = 0; i < ST_LSM6DSX_ID_MAX; i++) {
@ -1122,12 +1120,16 @@ static int __maybe_unused st_lsm6dsx_suspend(struct device *dev)
if (!(hw->enable_mask & BIT(sensor->id)))
continue;
reg = &st_lsm6dsx_odr_table[sensor->id].reg;
data = ST_LSM6DSX_SHIFT_VAL(0, reg->mask);
err = st_lsm6dsx_update_bits_locked(hw, reg->addr, reg->mask,
data);
if (sensor->id == ST_LSM6DSX_ID_EXT0 ||
sensor->id == ST_LSM6DSX_ID_EXT1 ||
sensor->id == ST_LSM6DSX_ID_EXT2)
err = st_lsm6dsx_shub_set_enable(sensor, false);
else
err = st_lsm6dsx_sensor_set_enable(sensor, false);
if (err < 0)
return err;
hw->suspend_mask |= BIT(sensor->id);
}
if (hw->fifo_mode != ST_LSM6DSX_FIFO_BYPASS)
@ -1147,12 +1149,19 @@ static int __maybe_unused st_lsm6dsx_resume(struct device *dev)
continue;
sensor = iio_priv(hw->iio_devs[i]);
if (!(hw->enable_mask & BIT(sensor->id)))
if (!(hw->suspend_mask & BIT(sensor->id)))
continue;
err = st_lsm6dsx_set_odr(sensor, sensor->odr);
if (sensor->id == ST_LSM6DSX_ID_EXT0 ||
sensor->id == ST_LSM6DSX_ID_EXT1 ||
sensor->id == ST_LSM6DSX_ID_EXT2)
err = st_lsm6dsx_shub_set_enable(sensor, true);
else
err = st_lsm6dsx_sensor_set_enable(sensor, true);
if (err < 0)
return err;
hw->suspend_mask &= ~BIT(sensor->id);
}
if (hw->enable_mask)