mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-26 03:20:55 +07:00
9b83ccd2f1
The wakeup.prepared flag is used for marking devices that have the wake-up power already enabled, so that the wake-up power is not enabled twice in a row for the same device. This assumes, however, that device wake-up power will only be enabled once, while the device is being prepared for a system-wide sleep transition, and the second attempt is made by acpi_enable_wakeup_device_prep(). With the upcoming PCI wake-up rework this assumption will not hold any more for PCI bridges and the root bridge whose wake-up power may be enabled as a result of wake-up enable propagation from other devices (eg. add-on devices that are not associated with any GPEs). Thus, there may be many attempts to enable wake-up power on a PCI bridge or the root bridge during a system power state transition and it's better to replace wakeup.prepared with a reference counter. Reviewed-by: Matthew Garrett <mjg59@srcf.ucam.org> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
149 lines
4.0 KiB
C
149 lines
4.0 KiB
C
/*
|
|
* wakeup.c - support wakeup devices
|
|
* Copyright (C) 2004 Li Shaohua <shaohua.li@intel.com>
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/acpi.h>
|
|
#include <acpi/acpi_drivers.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/types.h>
|
|
|
|
#include "internal.h"
|
|
#include "sleep.h"
|
|
|
|
/*
|
|
* We didn't lock acpi_device_lock in the file, because it invokes oops in
|
|
* suspend/resume and isn't really required as this is called in S-state. At
|
|
* that time, there is no device hotplug
|
|
**/
|
|
#define _COMPONENT ACPI_SYSTEM_COMPONENT
|
|
ACPI_MODULE_NAME("wakeup_devices")
|
|
|
|
/**
|
|
* acpi_enable_wakeup_device_prep - prepare wakeup devices
|
|
* @sleep_state: ACPI state
|
|
* Enable all wakup devices power if the devices' wakeup level
|
|
* is higher than requested sleep level
|
|
*/
|
|
|
|
void acpi_enable_wakeup_device_prep(u8 sleep_state)
|
|
{
|
|
struct list_head *node, *next;
|
|
|
|
list_for_each_safe(node, next, &acpi_wakeup_device_list) {
|
|
struct acpi_device *dev = container_of(node,
|
|
struct acpi_device,
|
|
wakeup_list);
|
|
|
|
if (!dev->wakeup.flags.valid ||
|
|
!dev->wakeup.state.enabled ||
|
|
(sleep_state > (u32) dev->wakeup.sleep_state))
|
|
continue;
|
|
|
|
acpi_enable_wakeup_device_power(dev, sleep_state);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* acpi_enable_wakeup_device - enable wakeup devices
|
|
* @sleep_state: ACPI state
|
|
* Enable all wakup devices's GPE
|
|
*/
|
|
void acpi_enable_wakeup_device(u8 sleep_state)
|
|
{
|
|
struct list_head *node, *next;
|
|
|
|
/*
|
|
* Caution: this routine must be invoked when interrupt is disabled
|
|
* Refer ACPI2.0: P212
|
|
*/
|
|
list_for_each_safe(node, next, &acpi_wakeup_device_list) {
|
|
struct acpi_device *dev =
|
|
container_of(node, struct acpi_device, wakeup_list);
|
|
|
|
if (!dev->wakeup.flags.valid)
|
|
continue;
|
|
|
|
/* If users want to disable run-wake GPE,
|
|
* we only disable it for wake and leave it for runtime
|
|
*/
|
|
if ((!dev->wakeup.state.enabled && !dev->wakeup.prepare_count)
|
|
|| sleep_state > (u32) dev->wakeup.sleep_state) {
|
|
if (dev->wakeup.flags.run_wake) {
|
|
/* set_gpe_type will disable GPE, leave it like that */
|
|
acpi_set_gpe_type(dev->wakeup.gpe_device,
|
|
dev->wakeup.gpe_number,
|
|
ACPI_GPE_TYPE_RUNTIME);
|
|
}
|
|
continue;
|
|
}
|
|
if (!dev->wakeup.flags.run_wake)
|
|
acpi_enable_gpe(dev->wakeup.gpe_device,
|
|
dev->wakeup.gpe_number);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* acpi_disable_wakeup_device - disable devices' wakeup capability
|
|
* @sleep_state: ACPI state
|
|
* Disable all wakup devices's GPE and wakeup capability
|
|
*/
|
|
void acpi_disable_wakeup_device(u8 sleep_state)
|
|
{
|
|
struct list_head *node, *next;
|
|
|
|
list_for_each_safe(node, next, &acpi_wakeup_device_list) {
|
|
struct acpi_device *dev =
|
|
container_of(node, struct acpi_device, wakeup_list);
|
|
|
|
if (!dev->wakeup.flags.valid)
|
|
continue;
|
|
|
|
if ((!dev->wakeup.state.enabled && !dev->wakeup.prepare_count)
|
|
|| sleep_state > (u32) dev->wakeup.sleep_state) {
|
|
if (dev->wakeup.flags.run_wake) {
|
|
acpi_set_gpe_type(dev->wakeup.gpe_device,
|
|
dev->wakeup.gpe_number,
|
|
ACPI_GPE_TYPE_WAKE_RUN);
|
|
/* Re-enable it, since set_gpe_type will disable it */
|
|
acpi_enable_gpe(dev->wakeup.gpe_device,
|
|
dev->wakeup.gpe_number);
|
|
}
|
|
continue;
|
|
}
|
|
|
|
acpi_disable_wakeup_device_power(dev);
|
|
/* Never disable run-wake GPE */
|
|
if (!dev->wakeup.flags.run_wake) {
|
|
acpi_disable_gpe(dev->wakeup.gpe_device,
|
|
dev->wakeup.gpe_number);
|
|
acpi_clear_gpe(dev->wakeup.gpe_device,
|
|
dev->wakeup.gpe_number, ACPI_NOT_ISR);
|
|
}
|
|
}
|
|
}
|
|
|
|
int __init acpi_wakeup_device_init(void)
|
|
{
|
|
struct list_head *node, *next;
|
|
|
|
mutex_lock(&acpi_device_lock);
|
|
list_for_each_safe(node, next, &acpi_wakeup_device_list) {
|
|
struct acpi_device *dev = container_of(node,
|
|
struct acpi_device,
|
|
wakeup_list);
|
|
/* In case user doesn't load button driver */
|
|
if (!dev->wakeup.flags.run_wake || dev->wakeup.state.enabled)
|
|
continue;
|
|
acpi_set_gpe_type(dev->wakeup.gpe_device,
|
|
dev->wakeup.gpe_number,
|
|
ACPI_GPE_TYPE_WAKE_RUN);
|
|
acpi_enable_gpe(dev->wakeup.gpe_device,
|
|
dev->wakeup.gpe_number);
|
|
dev->wakeup.state.enabled = 1;
|
|
}
|
|
mutex_unlock(&acpi_device_lock);
|
|
return 0;
|
|
}
|