pinctrl: amd: remove debounce filter setting in IRQ type setting
authorCoiby Xu <coiby.xu@gmail.com>
Wed, 25 Nov 2020 13:03:19 +0000 (21:03 +0800)
committerLinus Walleij <linus.walleij@linaro.org>
Fri, 4 Dec 2020 09:02:18 +0000 (10:02 +0100)
commit47a0001436352c9853d72bf2071e85b316d688a2
tree46cf8ac4fb11f5f62058495b5fa54b9bcb8276b5
parent5fa9c5f9a4076d32913b5857bac7620f46f27267
pinctrl: amd: remove debounce filter setting in IRQ type setting

Debounce filter setting should be independent from IRQ type setting
because according to the ACPI specs, there are separate arguments for
specifying debounce timeout and IRQ type in GpioIo() and GpioInt().

Together with commit 06abe8291bc31839950f7d0362d9979edc88a666
("pinctrl: amd: fix incorrect way to disable debounce filter") and
Andy's patch "gpiolib: acpi: Take into account debounce settings" [1],
this will fix broken touchpads for laptops whose BIOS set the
debounce timeout to a relatively large value. For example, the BIOS
of Lenovo AMD gaming laptops including Legion-5 15ARH05 (R7000),
Legion-5P (R7000P) and IdeaPad Gaming 3 15ARH05, set the debounce
timeout to 124.8ms. This led to the kernel receiving only ~7 HID
reports per second from the Synaptics touchpad
(MSFT0001:00 06CB:7F28).

Existing touchpads like [2][3] are not troubled by this bug because
the debounce timeout has been set to 0 by the BIOS before enabling
the debounce filter in setting IRQ type.

[1] https://lore.kernel.org/linux-gpio/20201111222008.39993-11-andriy.shevchenko@linux.intel.com/
    8dcb7a15a585 ("gpiolib: acpi: Take into account debounce settings")
[2] https://github.com/Syniurge/i2c-amd-mp2/issues/11#issuecomment-721331582
[3] https://forum.manjaro.org/t/random-short-touchpad-freezes/30832/28

Signed-off-by: Coiby Xu <coiby.xu@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/linux-gpio/CAHp75VcwiGREBUJ0A06EEw-SyabqYsp%2Bdqs2DpSrhaY-2GVdAA%40mail.gmail.com/
BugLink: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1887190
Link: https://lore.kernel.org/r/20201125130320.311059-1-coiby.xu@gmail.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
drivers/pinctrl/pinctrl-amd.c