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iio: imu: inv-mpu9150: fix irq ack preventing irq storms

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IRQ needs to be acked. for some odd reasons, reading from irq status does
not reliable help, enable acking from any register to be on the safe side
and read the irq status register. Comments in the code indicate a known
unreliability with that register.
The blamed commit was tested with mpu6050 in lg,p895 and lg,p880 according
to Tested-bys. But with the MPU9150 in the Epson Moverio BT-200 this leads
to irq storms without properly acking the irq.

Fixes: 0a3b517c80 ("iio: imu: inv_mpu6050: fix interrupt status read for old buggy chips")
Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Acked-by: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Andreas Kemnade
2025-12-31 22:14:16 +01:00
committed by Jonathan Cameron
parent 6c8bf4b604
commit d23d763e00
3 changed files with 14 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
View File

@@ -1943,6 +1943,14 @@ int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name,
irq_type);
return -EINVAL;
}
/*
* Acking interrupts by status register does not work reliably
* but seem to work when this bit is set.
*/
if (st->chip_type == INV_MPU9150)
st->irq_mask |= INV_MPU6050_INT_RD_CLEAR;
device_set_wakeup_capable(dev, true);
st->vdd_supply = devm_regulator_get(dev, "vdd");

2
drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h
View File

@@ -390,6 +390,8 @@ struct inv_mpu6050_state {
/* enable level triggering */
#define INV_MPU6050_LATCH_INT_EN 0x20
#define INV_MPU6050_BIT_BYPASS_EN 0x2
/* allow acking interrupts by any register read */
#define INV_MPU6050_INT_RD_CLEAR 0x10
/* Allowed timestamp period jitter in percent */
#define INV_MPU6050_TS_PERIOD_JITTER 4

5
drivers/iio/imu/inv_mpu6050/inv_mpu_trigger.c
View File

@@ -248,7 +248,6 @@ static irqreturn_t inv_mpu6050_interrupt_handle(int irq, void *p)
switch (st->chip_type) {
case INV_MPU6000:
case INV_MPU6050:
case INV_MPU9150:
/*
* WoM is not supported and interrupt status read seems to be broken for
* some chips. Since data ready is the only interrupt, bypass interrupt
@@ -257,6 +256,10 @@ static irqreturn_t inv_mpu6050_interrupt_handle(int irq, void *p)
wom_bits = 0;
int_status = INV_MPU6050_BIT_RAW_DATA_RDY_INT;
goto data_ready_interrupt;
case INV_MPU9150:
/* IRQ needs to be acked */
wom_bits = 0;
break;
case INV_MPU6500:
case INV_MPU6515:
case INV_MPU6880: