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PCI/PM: add runtime PM support to PCIe port 

This patch adds runtime PM support to PCIe port.  This is needed by
PCIe D3cold support, where PCIe device without ACPI node may be
powered on/off by PCIe port.

Because runtime suspend is broken for some chipsets, a black list is
used to disable runtime PM support for these chipsets.

Reviewed-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Zheng Yan <zheng.z.yan@intel.com>
Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Zheng Yan 2012-06-23 10:23:49 +08:00 committed by Bjorn Helgaas
parent ee85f54371
commit 71a83bd727
2 changed files with 34 additions and 0 deletions
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10
drivers/pci/pci.c
View File

@ -1518,6 +1518,16 @@ static void pci_pme_list_scan(struct work_struct *work)
if (!list_empty(&pci_pme_list)) {
list_for_each_entry_safe(pme_dev, n, &pci_pme_list, list) {
if (pme_dev->dev->pme_poll) {
struct pci_dev *bridge;
bridge = pme_dev->dev->bus->self;
/*
* If bridge is in low power state, the
* configuration space of subordinate devices
* may be not accessible
*/
if (bridge && bridge->current_state != PCI_D0)
continue;
pci_pme_wakeup(pme_dev->dev, NULL);
} else {
list_del(&pme_dev->list);

24
drivers/pci/pcie/portdrv_pci.c
View File

@ -11,6 +11,7 @@
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/init.h>
#include <linux/pcieport_if.h>
#include <linux/aer.h>
@ -99,6 +100,15 @@ static int pcie_port_resume_noirq(struct device *dev)
return 0;
}
#ifdef CONFIG_PM_RUNTIME
static int pcie_port_runtime_pm(struct device *dev)
{
return 0;
}
#else
#define pcie_port_runtime_pm NULL
#endif
static const struct dev_pm_ops pcie_portdrv_pm_ops = {
.suspend = pcie_port_device_suspend,
.resume = pcie_port_device_resume,
@ -107,6 +117,8 @@ static const struct dev_pm_ops pcie_portdrv_pm_ops = {
.poweroff = pcie_port_device_suspend,
.restore = pcie_port_device_resume,
.resume_noirq = pcie_port_resume_noirq,
.runtime_suspend = pcie_port_runtime_pm,
.runtime_resume = pcie_port_runtime_pm,
};
#define PCIE_PORTDRV_PM_OPS (&pcie_portdrv_pm_ops)
@ -116,6 +128,14 @@ static const struct dev_pm_ops pcie_portdrv_pm_ops = {
#define PCIE_PORTDRV_PM_OPS NULL
#endif /* !PM */
/*
* PCIe port runtime suspend is broken for some chipsets, so use a
* black list to disable runtime PM for these chipsets.
*/
static const struct pci_device_id port_runtime_pm_black_list[] = {
{ /* end: all zeroes */ }
};
/*
* pcie_portdrv_probe - Probe PCI-Express port devices
* @dev: PCI-Express port device being probed
@ -144,12 +164,16 @@ static int __devinit pcie_portdrv_probe(struct pci_dev *dev,
return status;
pci_save_state(dev);
if (!pci_match_id(port_runtime_pm_black_list, dev))
pm_runtime_put_noidle(&dev->dev);
return 0;
}
static void pcie_portdrv_remove(struct pci_dev *dev)
{
if (!pci_match_id(port_runtime_pm_black_list, dev))
pm_runtime_get_noresume(&dev->dev);
pcie_port_device_remove(dev);
pci_disable_device(dev);
}