diff mbox series

[v2,1/4] ACPI: scan: Add LNXVIDEO HID to ignore_serial_bus_ids[]

Message ID 20231104205828.63139-1-hdegoede@redhat.com (mailing list archive)
State Handled Elsewhere, archived
Headers show
Series [v2,1/4] ACPI: scan: Add LNXVIDEO HID to ignore_serial_bus_ids[] | expand

Commit Message

Hans de Goede Nov. 4, 2023, 8:58 p.m. UTC
The I2C-core already has filtering to skip i2c_client instantiation for
LNXVIDEO acpi_device-s with I2cSerialBus resources, since LNXVIDEO devices
are not i2c_client-s and are handled by the acpi_video driver.

This filtering was added to i2c-core-acpi.c in commit 3a4991a9864c ("i2c:
acpi: Do not create i2c-clients for LNXVIDEO ACPI devices").

Now a similar problem has shown up where the SPI-core is instantiating
an unwanted SPI-device for a SpiSerialBus resource under a LNXVIDEO
acpi_device. On a Lenovo Yoga Tab 3 YT3-X90F this unwanted SPI-device
instanstantiation causes the SPI-device instanstantiation for the WM5102
audio codec to fail with:

[   21.988441] pxa2xx-spi 8086228E:00: chipselect 0 already in use

Instead of duplicating the I2C-core filtering in the SPI-core code, push
the filtering of SerialBus resources under LNXVIDEO acpi_device-s up into
the ACPI-core by adding the LNXVIDEO HID to ignore_serial_bus_ids[].

Note the filtering in the I2C-core i2c_acpi_do_lookup() function is still
necessary because this not only impacts i2c_client instantiation but it
also makes the I2C-core ignore the I2cSerialBus resource when checking what
the maximum speed is the I2C bus supports, which is still necessary.

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/acpi/scan.c | 1 +
 1 file changed, 1 insertion(+)

Comments

Hans de Goede Nov. 20, 2023, 12:25 p.m. UTC | #1
Hi All,

On 11/4/23 21:58, Hans de Goede wrote:
> The I2C-core already has filtering to skip i2c_client instantiation for
> LNXVIDEO acpi_device-s with I2cSerialBus resources, since LNXVIDEO devices
> are not i2c_client-s and are handled by the acpi_video driver.
> 
> This filtering was added to i2c-core-acpi.c in commit 3a4991a9864c ("i2c:
> acpi: Do not create i2c-clients for LNXVIDEO ACPI devices").
> 
> Now a similar problem has shown up where the SPI-core is instantiating
> an unwanted SPI-device for a SpiSerialBus resource under a LNXVIDEO
> acpi_device. On a Lenovo Yoga Tab 3 YT3-X90F this unwanted SPI-device
> instanstantiation causes the SPI-device instanstantiation for the WM5102
> audio codec to fail with:
> 
> [   21.988441] pxa2xx-spi 8086228E:00: chipselect 0 already in use
> 
> Instead of duplicating the I2C-core filtering in the SPI-core code, push
> the filtering of SerialBus resources under LNXVIDEO acpi_device-s up into
> the ACPI-core by adding the LNXVIDEO HID to ignore_serial_bus_ids[].
> 
> Note the filtering in the I2C-core i2c_acpi_do_lookup() function is still
> necessary because this not only impacts i2c_client instantiation but it
> also makes the I2C-core ignore the I2cSerialBus resource when checking what
> the maximum speed is the I2C bus supports, which is still necessary.
> 
> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>

I've added this series to my review-hans (soon to be for-next) branch now.

Regards,

Hans



> ---
>  drivers/acpi/scan.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> index 691d4b7686ee..4b6faa2350f5 100644
> --- a/drivers/acpi/scan.c
> +++ b/drivers/acpi/scan.c
> @@ -1727,6 +1727,7 @@ static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
>  	 * Some ACPI devs contain SerialBus resources even though they are not
>  	 * attached to a serial bus at all.
>  	 */
> +		{ACPI_VIDEO_HID, },
>  		{"MSHW0028", },
>  	/*
>  	 * HIDs of device with an UartSerialBusV2 resource for which userspace
diff mbox series

Patch

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 691d4b7686ee..4b6faa2350f5 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1727,6 +1727,7 @@  static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
 	 * Some ACPI devs contain SerialBus resources even though they are not
 	 * attached to a serial bus at all.
 	 */
+		{ACPI_VIDEO_HID, },
 		{"MSHW0028", },
 	/*
 	 * HIDs of device with an UartSerialBusV2 resource for which userspace