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Date: Thu, 18 Feb 2016 17:43:30 +0800 From: Qipeng Zha <qipeng.zha@...el.com> To: linux-pci@...r.kernel.org Cc: linux-kernel@...r.kernel.org, bhelgaas@...gle.com, mika.westerberg@...el.com, Qi Zheng <qi.zheng@...el.com> Subject: [PATCH 1/2] PCI/PM: Revert "PCI/PM: Drop unused runtime PM support code for PCIe ports" This reverts commit fe9a743a2601 ("PCI/PM: Drop unused runtime PM support code for PCIe ports"). To support PCIe ports runtime PM for Intel Broxton platform. Signed-off-by: Qi Zheng <qi.zheng@...el.com> Signed-off-by: Qipeng Zha <qipeng.zha@...el.com> --- drivers/pci/pcie/portdrv_pci.c | 68 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 68 insertions(+) diff --git a/drivers/pci/pcie/portdrv_pci.c b/drivers/pci/pcie/portdrv_pci.c index be35da2..1e4a562 100644 --- a/drivers/pci/pcie/portdrv_pci.c +++ b/drivers/pci/pcie/portdrv_pci.c @@ -93,6 +93,71 @@ static int pcie_port_resume_noirq(struct device *dev) return 0; } +struct d3cold_info { + bool no_d3cold; + unsigned int d3cold_delay; +}; + +static int pci_dev_d3cold_info(struct pci_dev *pdev, void *data) +{ + struct d3cold_info *info = data; + + info->d3cold_delay = max_t(unsigned int, pdev->d3cold_delay, + info->d3cold_delay); + if (pdev->no_d3cold) + info->no_d3cold = true; + return 0; +} + +static int pcie_port_runtime_suspend(struct device *dev) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct d3cold_info d3cold_info = { + .no_d3cold = false, + .d3cold_delay = PCI_PM_D3_WAIT, + }; + + /* + * If any subordinate device disable D3cold, we should not put + * the port into D3cold. The D3cold delay of port should be + * the max of that of all subordinate devices. + */ + pci_walk_bus(pdev->subordinate, pci_dev_d3cold_info, &d3cold_info); + pdev->no_d3cold = d3cold_info.no_d3cold; + pdev->d3cold_delay = d3cold_info.d3cold_delay; + return 0; +} + +static int pcie_port_runtime_resume(struct device *dev) +{ + return 0; +} + +static int pci_dev_pme_poll(struct pci_dev *pdev, void *data) +{ + bool *pme_poll = data; + + if (pdev->pme_poll) + *pme_poll = true; + return 0; +} + +static int pcie_port_runtime_idle(struct device *dev) +{ + struct pci_dev *pdev = to_pci_dev(dev); + bool pme_poll = false; + + /* + * If any subordinate device needs pme poll, we should keep + * the port in D0, because we need port in D0 to poll it. + */ + pci_walk_bus(pdev->subordinate, pci_dev_pme_poll, &pme_poll); + /* Delay for a short while to prevent too frequent suspend/resume */ + if (!pme_poll) + pm_schedule_suspend(dev, 10); + return -EBUSY; +} + static const struct dev_pm_ops pcie_portdrv_pm_ops = { .suspend = pcie_port_device_suspend, .resume = pcie_port_device_resume, @@ -101,6 +166,9 @@ 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_suspend, + .runtime_resume = pcie_port_runtime_resume, + .runtime_idle = pcie_port_runtime_idle, }; #define PCIE_PORTDRV_PM_OPS (&pcie_portdrv_pm_ops) -- 1.8.3.2
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