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Date: Tue, 15 May 2012 15:00:10 +0800 From: Huang Ying <ying.huang@...el.com> To: Bjorn Helgaas <bhelgaas@...gle.com> Cc: ming.m.lin@...el.com, linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org, "Rafael J. Wysocki" <rjw@...k.pl>, Huang Ying <ying.huang@...el.com>, Zheng Yan <zheng.z.yan@...el.com> Subject: [PATCH -v3 1/2] PCIe: Add runtime PM support to PCIe port From: "Yan, Zheng" <zheng.z.yan@...el.com> 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. Signed-off-by: Zheng Yan <zheng.z.yan@...el.com> --- drivers/pci/pci.c | 10 ++++++++++ drivers/pci/pcie/portdrv_pci.c | 30 ++++++++++++++++++++++++++++++ 2 files changed, 40 insertions(+) --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -1517,6 +1517,16 @@ static void pci_pme_list_scan(struct wor 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); --- a/drivers/pci/pcie/portdrv_pci.c +++ b/drivers/pci/pcie/portdrv_pci.c @@ -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 +100,21 @@ static int pcie_port_resume_noirq(struct return 0; } +#ifdef CONFIG_PM_RUNTIME +static int pcie_port_runtime_suspend(struct device *dev) +{ + return 0; +} + +static int pcie_port_runtime_resume(struct device *dev) +{ + return 0; +} +#else +#define pcie_port_runtime_suspend NULL +#define pcie_port_runtime_resume NULL +#endif + static const struct dev_pm_ops pcie_portdrv_pm_ops = { .suspend = pcie_port_device_suspend, .resume = pcie_port_device_resume, @@ -107,6 +123,8 @@ static const struct dev_pm_ops pcie_port .poweroff = pcie_port_device_suspend, .restore = pcie_port_device_resume, .resume_noirq = pcie_port_resume_noirq, + .runtime_suspend = pcie_port_runtime_suspend, + .runtime_resume = pcie_port_runtime_resume, }; #define PCIE_PORTDRV_PM_OPS (&pcie_portdrv_pm_ops) @@ -117,6 +135,14 @@ static const struct dev_pm_ops pcie_port #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 +170,16 @@ static int __devinit pcie_portdrv_probe( 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); } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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