Hello Jonathan and Svyatoslav,
this is really strange because it is an I2C transaction error happening.
The chip is obviously on, otherwise it would not be able to send interrupt and have sensors running.
For investigating the issue, we need to know what is the chip used inside this device. The driver is supporting a lot of chips that may have some specific behaviors.
Svyatoslav,
can you give us the name of the chip in this LG device or the whoami value read by the driver?
Thanks a lot for your help.
JB
________________________________________
From: Jonathan Cameron <jic23@xxxxxxxxxx>
Sent: Tuesday, August 6, 2024 18:53
To: Svyatoslav Ryhel <clamor95@xxxxxxxxx>
Cc: INV Git Commit <INV.git-commit@xxxxxxx>; lars@xxxxxxxxxx <lars@xxxxxxxxxx>; linux-iio@xxxxxxxxxxxxxxx <linux-iio@xxxxxxxxxxxxxxx>; Jean-Baptiste Maneyrol <Jean-Baptiste.Maneyrol@xxxxxxx>
Subject: Re: [PATCH v3 3/4] iio: imu: inv_mpu6050: add new interrupt handler for WoM events
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On Tue, 23 Jul 2024 11:25:03 +0300
Svyatoslav Ryhel <clamor95@xxxxxxxxx> wrote:
> 11.03.24 6:05 пп, inv.git-commit@xxxxxxx:
> > From: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@xxxxxxx>
> >
> > Add new interrupt handler for generating WoM event from int status register
> > bits. Launch from interrupt the trigger poll function for data buffer.
> >
> > Signed-off-by: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@xxxxxxx>
Jean-Baptiste,
Please take a look at this report. I'd rather not revert the series
if we can figure out what is wrong and get a fix on top in reasonably
quickly.
I'd guess a power problem so we are getting interrupts when device is powered down?
Hence the reads fail.
Jonathan
> > ---
> > drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h | 2 +
> > drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c | 11 ---
> > drivers/iio/imu/inv_mpu6050/inv_mpu_trigger.c | 69 +++++++++++++++++--
> > 3 files changed, 66 insertions(+), 16 deletions(-)
> >
> > diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h b/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h
> > index d5b0465d1f74..ca5f7d45a6d4 100644
> > --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h
> > +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h
> > @@ -185,6 +185,7 @@ struct inv_mpu6050_hw {
> > * @magn_orient: magnetometer sensor chip orientation if available.
> > * @suspended_sensors: sensors mask of sensors turned off for suspend
> > * @data: read buffer used for bulk reads.
> > + * @it_timestamp: interrupt timestamp.
> > */
> > struct inv_mpu6050_state {
> > struct mutex lock;
> > @@ -210,6 +211,7 @@ struct inv_mpu6050_state {
> > unsigned int suspended_sensors;
> > bool level_shifter;
> > u8 *data;
> > + s64 it_timestamp;
> > };
> >
> > /*register and associated bit definition*/
> > diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c
> > index 13da6f523ca2..e282378ee2ca 100644
> > --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c
> > +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c
> > @@ -51,21 +51,10 @@ irqreturn_t inv_mpu6050_read_fifo(int irq, void *p)
> > u32 fifo_period;
> > s64 timestamp;
> > u8 data[INV_MPU6050_OUTPUT_DATA_SIZE];
> > - int int_status;
> > size_t i, nb;
> >
> > mutex_lock(&st->lock);
> >
> > - /* ack interrupt and check status */
> > - result = regmap_read(st->map, st->reg->int_status, &int_status);
> > - if (result) {
> > - dev_err(regmap_get_device(st->map),
> > - "failed to ack interrupt\n");
> > - goto flush_fifo;
> > - }
> > - if (!(int_status & INV_MPU6050_BIT_RAW_DATA_RDY_INT))
> > - goto end_session;
> > -
> > if (!(st->chip_config.accl_fifo_enable |
> > st->chip_config.gyro_fifo_enable |
> > st->chip_config.magn_fifo_enable))
> > diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_trigger.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_trigger.c
> > index ec2398a87f45..2514966f6495 100644
> > --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_trigger.c
> > +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_trigger.c
> > @@ -6,6 +6,7 @@
> > #include <linux/pm_runtime.h>
> >
> > #include <linux/iio/common/inv_sensors_timestamp.h>
> > +#include <linux/iio/events.h>
> >
> > #include "inv_mpu_iio.h"
> >
> > @@ -223,6 +224,65 @@ static const struct iio_trigger_ops inv_mpu_trigger_ops = {
> > .set_trigger_state = &inv_mpu_data_rdy_trigger_set_state,
> > };
> >
> > +static irqreturn_t inv_mpu6050_interrupt_timestamp(int irq, void *p)
> > +{
> > + struct iio_dev *indio_dev = p;
> > + struct inv_mpu6050_state *st = iio_priv(indio_dev);
> > +
> > + st->it_timestamp = iio_get_time_ns(indio_dev);
> > +
> > + return IRQ_WAKE_THREAD;
> > +}
> > +
> > +static irqreturn_t inv_mpu6050_interrupt_handle(int irq, void *p)
> > +{
> > + struct iio_dev *indio_dev = p;
> > + struct inv_mpu6050_state *st = iio_priv(indio_dev);
> > + unsigned int int_status, wom_bits;
> > + u64 ev_code;
> > + int result;
> > +
> > + switch (st->chip_type) {
> > + case INV_MPU6050:
> > + case INV_MPU6500:
> > + case INV_MPU6515:
> > + case INV_MPU6880:
> > + case INV_MPU6000:
> > + case INV_MPU9150:
> > + case INV_MPU9250:
> > + case INV_MPU9255:
> > + wom_bits = INV_MPU6500_BIT_WOM_INT;
> > + break;
> > + default:
> > + wom_bits = INV_ICM20608_BIT_WOM_INT;
> > + break;
> > + }
> > +
> > + scoped_guard(mutex, &st->lock) {
> > + /* ack interrupt and check status */
> > + result = regmap_read(st->map, st->reg->int_status, &int_status);
> > + if (result) {
> > + dev_err(regmap_get_device(st->map), "failed to ack interrupt\n");
> > + return IRQ_HANDLED;
> > + }
> > +
> > + /* handle WoM event */
> > + if (st->chip_config.wom_en && (int_status & wom_bits)) {
> > + ev_code = IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, IIO_MOD_X_OR_Y_OR_Z,
> > + IIO_EV_TYPE_ROC, IIO_EV_DIR_RISING);
> > + iio_push_event(indio_dev, ev_code, st->it_timestamp);
> > + }
> > + }
> > +
> > + /* handle raw data interrupt */
> > + if (int_status & INV_MPU6050_BIT_RAW_DATA_RDY_INT) {
> > + indio_dev->pollfunc->timestamp = st->it_timestamp;
> > + iio_trigger_poll_nested(st->trig);
> > + }
> > +
> > + return IRQ_HANDLED;
> > +}
> > +
> > int inv_mpu6050_probe_trigger(struct iio_dev *indio_dev, int irq_type)
> > {
> > int ret;
> > @@ -235,11 +295,10 @@ int inv_mpu6050_probe_trigger(struct iio_dev *indio_dev, int irq_type)
> > if (!st->trig)
> > return -ENOMEM;
> >
> > - ret = devm_request_irq(&indio_dev->dev, st->irq,
> > - &iio_trigger_generic_data_rdy_poll,
> > - irq_type,
> > - "inv_mpu",
> > - st->trig);
> > + ret = devm_request_threaded_irq(&indio_dev->dev, st->irq,
> > + &inv_mpu6050_interrupt_timestamp,
> > + &inv_mpu6050_interrupt_handle,
> > + irq_type, "inv_mpu", indio_dev);
> > if (ret)
> > return ret;
> >
>
> Greetings!
>
> After this patch was applied to Linux kernel I faced a regression on my
> devices LG P895/P880.
>
> Dmesg is flooded with
>
> [ 50.035018] inv-mpu6050-i2c 0-0068: failed to ack interrupt -121
>
> and mpu6050 used on this device refuses to work. It did not occur before
> WoM patches were
>
> applied and reverting patches restores normal work of mpu6050.
>
>
> Best regards,
>
> Svyatoslav R.
>
