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gpiolib: acpi: Add honor_wakeup module-option + quirk mechanism 

On some laptops enabling wakeup on the GPIO interrupts used for ACPI _AEI
event handling causes spurious wakeups.

This commit adds a new honor_wakeup option, defaulting to true (our current
behavior), which can be used to disable wakeup on troublesome hardware
to avoid these spurious wakeups.

This is a workaround for an architectural problem with s2idle under Linux
where we do not have any mechanism to immediately go back to sleep after
wakeup events, other then for embedded-controller events using the standard
ACPI EC interface, for details see:
https://lore.kernel.org/linux-acpi/61450f9b-cbc6-0c09-8b3a-aff6bf9a0b3c@redhat.com/

One series of laptops which is not able to suspend without this workaround
is the HP x2 10 Cherry Trail models, this commit adds a DMI based quirk
which makes sets honor_wakeup to false on these models.

Cc: stable@vger.kernel.org
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20200105160357.97154-3-hdegoede@redhat.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Hans de Goede 2020-01-05 17:03:57 +01:00 committed by Linus Walleij
parent 1ad1b54099
commit aa23ca3d98
1 changed files with 31 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
drivers/gpio/gpiolib-acpi.c
View File

@ -22,12 +22,18 @@
#include "gpiolib-acpi.h"
#define QUIRK_NO_EDGE_EVENTS_ON_BOOT 0x01l
#define QUIRK_NO_WAKEUP 0x02l
static int run_edge_events_on_boot = -1;
module_param(run_edge_events_on_boot, int, 0444);
MODULE_PARM_DESC(run_edge_events_on_boot,
"Run edge _AEI event-handlers at boot: 0=no, 1=yes, -1=auto");
static int honor_wakeup = -1;
module_param(honor_wakeup, int, 0444);
MODULE_PARM_DESC(honor_wakeup,
"Honor the ACPI wake-capable flag: 0=no, 1=yes, -1=auto");
/**
* struct acpi_gpio_event - ACPI GPIO event handler data
*
@ -283,7 +289,7 @@ static acpi_status acpi_gpiochip_alloc_event(struct acpi_resource *ares,
event->handle = evt_handle;
event->handler = handler;
event->irq = irq;
event->irq_is_wake = agpio->wake_capable == ACPI_WAKE_CAPABLE;
event->irq_is_wake = honor_wakeup && agpio->wake_capable == ACPI_WAKE_CAPABLE;
event->pin = pin;
event->desc = desc;
@ -1337,6 +1343,23 @@ static const struct dmi_system_id gpiolib_acpi_quirks[] = {
},
.driver_data = (void *)QUIRK_NO_EDGE_EVENTS_ON_BOOT,
},
{
/*
* Various HP X2 10 Cherry Trail models use an external
* embedded-controller connected via I2C + an ACPI GPIO
* event handler. The embedded controller generates various
* spurious wakeup events when suspended. So disable wakeup
* for its handler (it uses the only ACPI GPIO event handler).
* This breaks wakeup when opening the lid, the user needs
* to press the power-button to wakeup the system. The
* alternative is suspend simply not working, which is worse.
*/
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "HP"),
DMI_MATCH(DMI_PRODUCT_NAME, "HP x2 Detachable 10-p0XX"),
},
.driver_data = (void *)QUIRK_NO_WAKEUP,
},
{} /* Terminating entry */
};
@ -1356,6 +1379,13 @@ static int acpi_gpio_setup_params(void)
run_edge_events_on_boot = 1;
}
if (honor_wakeup < 0) {
if (quirks & QUIRK_NO_WAKEUP)
honor_wakeup = 0;
else
honor_wakeup = 1;
}
return 0;
}