On Wed, Feb 07, 2024 at 08:55:50PM +0100, Jesus Gonzalez wrote:
> "10EC5280" is used by several manufacturers like Lenovo, GPD, or AYA (and
> probably others) in their ACPI table as the ID for the bmi160 IMU. This
> means the bmi160_i2c driver won't bind to it, and the IMU is unavailable
> to the user. Manufacturers have been approached on several occasions to
> try getting a BIOS with a fixed ID, mostly without actual positive
> results, and since affected devices are already a few years old, this is
> not expected to change. This patch enables using the bmi160_i2c driver for
> the bmi160 IMU on these devices.
>
> Here is the relevant extract from the DSDT of a GPD Win Max 2 (AMD 6800U
> model) with the latest firmware 1.05 installed. GPD sees this as WONTFIX
> with the argument of the device working with the Windows drivers.
>
> Device (BMA2)
> {
> Name (_ADR, Zero) // _ADR: Address
> Name (_HID, "10EC5280") // _HID: Hardware ID
> Name (_CID, "10EC5280") // _CID: Compatible ID
> Name (_DDN, "Accelerometer") // _DDN: DOS Device Name
> Name (_UID, One) // _UID: Unique ID
> Method (_CRS, 0, NotSerialized) // _CRS: Current Resource Settings
> {
> Name (RBUF, ResourceTemplate ()
> {
> I2cSerialBusV2 (0x0069, ControllerInitiated, 0x00061A80,
> AddressingMode7Bit, "\\_SB.I2CC",
> 0x00, ResourceConsumer, , Exclusive,
> )
> })
> Return (RBUF) /* \_SB_.I2CC.BMA2._CRS.RBUF */
> }
>
> ...
>
> }
(It's your responsibility to carry on the tags you got in case you send a new
version. But for the sake of constructive feedback I'll give it once more this
time, so no need to send a new version.)
Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
> Signed-off-by: Jesus Gonzalez <jesusmgh@xxxxxxxxx>
> ---
> v4: Moved comment back to relevant position inside function
>
> drivers/iio/imu/bmi160/bmi160_i2c.c | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/drivers/iio/imu/bmi160/bmi160_i2c.c b/drivers/iio/imu/bmi160/bmi160_i2c.c
> index 81652c08e644..a081305254db 100644
> --- a/drivers/iio/imu/bmi160/bmi160_i2c.c
> +++ b/drivers/iio/imu/bmi160/bmi160_i2c.c
> @@ -43,6 +43,15 @@ static const struct i2c_device_id bmi160_i2c_id[] = {
> MODULE_DEVICE_TABLE(i2c, bmi160_i2c_id);
>
> static const struct acpi_device_id bmi160_acpi_match[] = {
> + /*
> + * FIRMWARE BUG WORKAROUND
> + * Some manufacturers like GPD, Lenovo or Aya used the incorrect
> + * ID "10EC5280" for bmi160 in their DSDT. A fixed firmware is not
> + * available as of Feb 2024 after trying to work with OEMs, and
> + * this is not expected to change anymore since at least some of
> + * the affected devices are from 2021/2022.
> + */
> + {"10EC5280", 0},
> {"BMI0160", 0},
> { },
> };
> --
> 2.43.0
>
--
With Best Regards,
Andy Shevchenko
