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i2c: acpi: Do not instantiate I2C-clients on boards with known bogus DSDT entries

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x86 ACPI devices which ship with only Android as their factory image
usually declare a whole bunch of bogus I2C devices in their ACPI tables.

Instantiating I2C clients for these bogus devices causes various issues,
e.g. GPIO/IRQ resource conflicts because sometimes drivers do bind to them.
The Android x86 kernel fork shipped on these devices has some special code
to remove these bogus devices, instead of just fixing the DSDT <sigh>.

Use the new acpi_quirk_skip_i2c_client_enumeration() helper to identify
known boards / acpi devices with this issue, and skip enumerating these.

Note these boards typically do actually have I2C devices, just
different ones then the ones described in their DSDT. The devices
which are actually present are manually instantiated by the
drivers/platform/x86/x86-android-tablets.c kernel module.

Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Hans de Goede 2021-12-30 15:17:21 +01:00 committed by Rafael J. Wysocki
parent 35f9e773bb
commit a6e1445c44
1 changed files with 7 additions and 0 deletions
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7
drivers/i2c/i2c-core-acpi.c
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@ -254,6 +254,13 @@ static void i2c_acpi_register_device(struct i2c_adapter *adapter,
struct acpi_device *adev,
struct i2c_board_info *info)
{
/*
* Skip registration on boards where the ACPI tables are
* known to contain bogus I2C devices.
*/
if (acpi_quirk_skip_i2c_client_enumeration(adev))
return;
adev->power.flags.ignore_parent = true;
acpi_device_set_enumerated(adev);