![Rafael J. Wysocki](/assets/img/avatar_default.png)
Move a debug message from acpi_pci_sleep_wake() to acpi_pm_device_sleep_wake() and use the standard dev_*() macros in there. 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>
186 lines
4.6 KiB
C
186 lines
4.6 KiB
C
/*
|
|
* File: pci-acpi.c
|
|
* Purpose: Provide PCI support in ACPI
|
|
*
|
|
* Copyright (C) 2005 David Shaohua Li <shaohua.li@intel.com>
|
|
* Copyright (C) 2004 Tom Long Nguyen <tom.l.nguyen@intel.com>
|
|
* Copyright (C) 2004 Intel Corp.
|
|
*/
|
|
|
|
#include <linux/delay.h>
|
|
#include <linux/init.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/module.h>
|
|
#include <linux/pci-aspm.h>
|
|
#include <acpi/acpi.h>
|
|
#include <acpi/acpi_bus.h>
|
|
|
|
#include <linux/pci-acpi.h>
|
|
#include "pci.h"
|
|
|
|
/*
|
|
* _SxD returns the D-state with the highest power
|
|
* (lowest D-state number) supported in the S-state "x".
|
|
*
|
|
* If the devices does not have a _PRW
|
|
* (Power Resources for Wake) supporting system wakeup from "x"
|
|
* then the OS is free to choose a lower power (higher number
|
|
* D-state) than the return value from _SxD.
|
|
*
|
|
* But if _PRW is enabled at S-state "x", the OS
|
|
* must not choose a power lower than _SxD --
|
|
* unless the device has an _SxW method specifying
|
|
* the lowest power (highest D-state number) the device
|
|
* may enter while still able to wake the system.
|
|
*
|
|
* ie. depending on global OS policy:
|
|
*
|
|
* if (_PRW at S-state x)
|
|
* choose from highest power _SxD to lowest power _SxW
|
|
* else // no _PRW at S-state x
|
|
* choose highest power _SxD or any lower power
|
|
*/
|
|
|
|
static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
|
|
{
|
|
int acpi_state;
|
|
|
|
acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL);
|
|
if (acpi_state < 0)
|
|
return PCI_POWER_ERROR;
|
|
|
|
switch (acpi_state) {
|
|
case ACPI_STATE_D0:
|
|
return PCI_D0;
|
|
case ACPI_STATE_D1:
|
|
return PCI_D1;
|
|
case ACPI_STATE_D2:
|
|
return PCI_D2;
|
|
case ACPI_STATE_D3:
|
|
return PCI_D3hot;
|
|
}
|
|
return PCI_POWER_ERROR;
|
|
}
|
|
|
|
static bool acpi_pci_power_manageable(struct pci_dev *dev)
|
|
{
|
|
acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
|
|
|
|
return handle ? acpi_bus_power_manageable(handle) : false;
|
|
}
|
|
|
|
static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
|
|
{
|
|
acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
|
|
acpi_handle tmp;
|
|
static const u8 state_conv[] = {
|
|
[PCI_D0] = ACPI_STATE_D0,
|
|
[PCI_D1] = ACPI_STATE_D1,
|
|
[PCI_D2] = ACPI_STATE_D2,
|
|
[PCI_D3hot] = ACPI_STATE_D3,
|
|
[PCI_D3cold] = ACPI_STATE_D3
|
|
};
|
|
int error = -EINVAL;
|
|
|
|
/* If the ACPI device has _EJ0, ignore the device */
|
|
if (!handle || ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
|
|
return -ENODEV;
|
|
|
|
switch (state) {
|
|
case PCI_D0:
|
|
case PCI_D1:
|
|
case PCI_D2:
|
|
case PCI_D3hot:
|
|
case PCI_D3cold:
|
|
error = acpi_bus_set_power(handle, state_conv[state]);
|
|
}
|
|
|
|
if (!error)
|
|
dev_printk(KERN_INFO, &dev->dev,
|
|
"power state changed by ACPI to D%d\n", state);
|
|
|
|
return error;
|
|
}
|
|
|
|
static bool acpi_pci_can_wakeup(struct pci_dev *dev)
|
|
{
|
|
acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
|
|
|
|
return handle ? acpi_bus_can_wakeup(handle) : false;
|
|
}
|
|
|
|
static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
|
|
{
|
|
return acpi_pci_can_wakeup(dev) ?
|
|
acpi_pm_device_sleep_wake(&dev->dev, enable) : 0;
|
|
}
|
|
|
|
static struct pci_platform_pm_ops acpi_pci_platform_pm = {
|
|
.is_manageable = acpi_pci_power_manageable,
|
|
.set_state = acpi_pci_set_power_state,
|
|
.choose_state = acpi_pci_choose_state,
|
|
.can_wakeup = acpi_pci_can_wakeup,
|
|
.sleep_wake = acpi_pci_sleep_wake,
|
|
};
|
|
|
|
/* ACPI bus type */
|
|
static int acpi_pci_find_device(struct device *dev, acpi_handle *handle)
|
|
{
|
|
struct pci_dev * pci_dev;
|
|
acpi_integer addr;
|
|
|
|
pci_dev = to_pci_dev(dev);
|
|
/* Please ref to ACPI spec for the syntax of _ADR */
|
|
addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
|
|
*handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
|
|
if (!*handle)
|
|
return -ENODEV;
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle)
|
|
{
|
|
int num;
|
|
unsigned int seg, bus;
|
|
|
|
/*
|
|
* The string should be the same as root bridge's name
|
|
* Please look at 'pci_scan_bus_parented'
|
|
*/
|
|
num = sscanf(dev_name(dev), "pci%04x:%02x", &seg, &bus);
|
|
if (num != 2)
|
|
return -ENODEV;
|
|
*handle = acpi_get_pci_rootbridge_handle(seg, bus);
|
|
if (!*handle)
|
|
return -ENODEV;
|
|
return 0;
|
|
}
|
|
|
|
static struct acpi_bus_type acpi_pci_bus = {
|
|
.bus = &pci_bus_type,
|
|
.find_device = acpi_pci_find_device,
|
|
.find_bridge = acpi_pci_find_root_bridge,
|
|
};
|
|
|
|
static int __init acpi_pci_init(void)
|
|
{
|
|
int ret;
|
|
|
|
if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) {
|
|
printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");
|
|
pci_no_msi();
|
|
}
|
|
|
|
if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
|
|
printk(KERN_INFO"ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
|
|
pcie_no_aspm();
|
|
}
|
|
|
|
ret = register_acpi_bus_type(&acpi_pci_bus);
|
|
if (ret)
|
|
return 0;
|
|
pci_set_platform_pm(&acpi_pci_platform_pm);
|
|
return 0;
|
|
}
|
|
arch_initcall(acpi_pci_init);
|