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PCI/PM: add runtime PM support to PCIe port

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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
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@@ -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);