i2c: acpi: Use ACPI wake capability bit to set wake_irq

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Device tree already has a mechanism to pass the wake_irq. It does this
by looking for the wakeup-source property and setting the
I2C_CLIENT_WAKE flag. This CL adds the ACPI equivalent. It uses the
ACPI interrupt wake flag to determine if the interrupt can be used to
wake the system. Previously the i2c drivers had to make assumptions and
blindly enable the wake IRQ. This can cause spurious wake events. e.g.,
If there is a device with an Active Low interrupt and the device gets
powered off while suspending, the interrupt line will go low since it's
no longer powered and wakes the system. For this reason we should
respect the board designers wishes and honor the wake bit defined on the
interrupt.

Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

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Raul E Rangel 2022-09-29 10:19:11 -06:00 • committed by Rafael J. Wysocki

parent 5ff811604f

commit b38f2d5d96

3 changed files with 37 additions and 13 deletions

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40

drivers/i2c/i2c-core-acpi.c

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6

drivers/i2c/i2c-core-base.c

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4

drivers/i2c/i2c-core.h

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