PCI/PM: add runtime PM support to PCIe port (71a83bd7) · Commits · 戴 / test

drivers/pci/pci.c

+10 −0

Original line number	Diff line number	Diff line
		@@ -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);

drivers/pci/pcie/portdrv_pci.c

+24 −0

Original line number	Diff line number	Diff line
		@@ -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);
		}

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