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Message-Id: <1455788611-59790-1-git-send-email-qipeng.zha@intel.com>
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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