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On some X86 devices we do not register an input-device, because the power-button is also handled by the soc_button_array (GPIO) input driver, and we want to avoid reporting power-button presses to userspace twice. Sofar when we did this we also did not register our interrupt handlers, since those were only necessary to report input events. But on at least 2 device models the Medion Akoya E1239T and the GPD win, the GPIO pin used by the soc_button_array driver for the power-button cannot wakeup the system from suspend. Why this does not work is not clear, I've tried comparing the value of all relevant registers on the Cherry Trail SoC, with those from models where this does work. I've checked: PMC registers: FUNC_DIS, FUNC_DIS2, SOIX_WAKE_EN, D3_STS_0, D3_STS_1, D3_STDBY_STS_0, D3_STDBY_STS_1; PMC ACPI I/O regs: PM1_STS_EN, GPE0a_EN and they all have identical contents in the working and non working cases. I suspect that the firmware either sets some unknown register to a value causing this, or that it turns off a power-plane which is necessary for GPIO wakeups to work during suspend. What does work on the Medion Akoya E1239T is letting the AXP288 wakeup the system on a power-button press (the GPD win has a different PMIC). Move the registering of the power-button press/release interrupt-handler from axp20x_pek_probe_input_device() to axp20x_pek_probe() so that the PMIC will wakeup the system on a power-button press, even if we do not register an input device. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Acked-by: Chen-Yu Tsai <wens@csie.org> Link: https://lore.kernel.org/r/20200426155757.297087-1-hdegoede@redhat.com Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.