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Apply commit d7b88dcb (mb/google/x86-boards: Get rid of power button
device in coreboot) to AMD Brazos boards [1]:
> As per the ACPI specification, there are two types of power button
> devices:
> 1. Fixed hardware power button
> 2. Generic hardware power button
>
> Fixed hardware power button is added by the OSPM if POWER_BUTTON flag
> is not set in FADT by the BIOS. This device has its programming model
> in PM1x_EVT_BLK. All ACPI compliant OSes are expected to add this
> power button device by default if the power button FADT flag is not
> set.
>
> On the other hand, generic hardware power button can be used by
> platforms if fixed register space cannot be used for the power button
> device. In order to support this, power button device object with HID
> PNP0C0C is expected to be added to ACPI tables. Additionally,
> POWER_BUTTON flag should be set to indicate the presence of control
> method for power button.
[..]
> This change gets rid of the generic hardware power button from all
> google mainboards and relies completely on the fixed hardware power
> button.
The same problem exists with the AMD Hudson devices in coreboot.
For AMD Hudson (2) and Yangtze based devices this was removed in commit
44f2fab8 (AMD hudson and yangtze boards: Let mainboard declare power
button) [2].
Two devices are detected.
$ dmesg | grep Button
[ 0.209213] input: Power Button as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0C:00/input/input0
[ 0.209254] ACPI: Power Button [PWRB]
[ 0.209332] input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input1
[ 0.209349] ACPI: Power Button [PWRF]
$ sudo evtest
No device specified, trying to scan all of /dev/input/event*
Available devices:
/dev/input/event0: Power Button
/dev/input/event1: Power Button
[..]
[1]: https://review.coreboot.org/5546
[2]: https://review.coreboot.org/27272
Change-Id: I0cbecb72f7e1bf3d051d3b7656c6af4d6f43b497
Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/27496
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
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