From: Kishon Vijay Abraham I <kishon@ti.com>
To: <bhelgaas@google.com>, <linux-omap@vger.kernel.org>,
<linux-pci@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Cc: <nsekhar@ti.com>, <kishon@ti.com>
Subject: [PATCH v2 2/3] PCI: host: pci-dra7xx: add pm support to pci dra7xx
Date: Fri, 24 Jul 2015 17:23:09 +0530 [thread overview]
Message-ID: <1437738790-11114-3-git-send-email-kishon@ti.com> (raw)
In-Reply-To: <1437738790-11114-1-git-send-email-kishon@ti.com>
Add PM support to pci-dra7xx so that PCI clocks can be disabled
during suspend and enabled back during resume without affecting
PCI functionality.
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
drivers/pci/host/pci-dra7xx.c | 77 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 77 insertions(+)
diff --git a/drivers/pci/host/pci-dra7xx.c b/drivers/pci/host/pci-dra7xx.c
index d8b6d66..d3ee2ef 100644
--- a/drivers/pci/host/pci-dra7xx.c
+++ b/drivers/pci/host/pci-dra7xx.c
@@ -433,6 +433,82 @@ static int __exit dra7xx_pcie_remove(struct platform_device *pdev)
return 0;
}
+#ifdef CONFIG_PM_SLEEP
+static int dra7xx_pcie_suspend(struct device *dev)
+{
+ struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
+ struct pcie_port *pp = &dra7xx->pp;
+
+ dw_pcie_suspend_rc(pp);
+
+ return 0;
+}
+
+static int dra7xx_pcie_resume(struct device *dev)
+{
+ struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
+ struct pcie_port *pp = &dra7xx->pp;
+
+ dw_pcie_resume_rc(pp);
+
+ return 0;
+}
+
+static int dra7xx_pcie_suspend_noirq(struct device *dev)
+{
+ struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
+ int count = dra7xx->phy_count;
+
+ while (count--) {
+ phy_power_off(dra7xx->phy[count]);
+ phy_exit(dra7xx->phy[count]);
+ }
+
+ return 0;
+}
+
+static int dra7xx_pcie_resume_noirq(struct device *dev)
+{
+ struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
+ int phy_count = dra7xx->phy_count;
+ int ret;
+ int i;
+
+ for (i = 0; i < phy_count; i++) {
+ ret = phy_init(dra7xx->phy[i]);
+ if (ret < 0)
+ goto err_phy;
+
+ ret = phy_power_on(dra7xx->phy[i]);
+ if (ret < 0) {
+ phy_exit(dra7xx->phy[i]);
+ goto err_phy;
+ }
+ }
+
+ return 0;
+
+err_phy:
+ while (--i >= 0) {
+ phy_power_off(dra7xx->phy[i]);
+ phy_exit(dra7xx->phy[i]);
+ }
+
+ return ret;
+}
+
+static const struct dev_pm_ops dra7xx_pcie_pm_ops = {
+ .suspend_noirq = dra7xx_pcie_suspend_noirq,
+ .suspend = dra7xx_pcie_suspend,
+ .resume_noirq = dra7xx_pcie_resume_noirq,
+ .resume = dra7xx_pcie_resume,
+};
+
+#define DEV_PM_OPS (&dra7xx_pcie_pm_ops)
+#else
+#define DEV_PM_OPS NULL
+#endif
+
static const struct of_device_id of_dra7xx_pcie_match[] = {
{ .compatible = "ti,dra7-pcie", },
{},
@@ -444,6 +520,7 @@ static struct platform_driver dra7xx_pcie_driver = {
.driver = {
.name = "dra7-pcie",
.of_match_table = of_dra7xx_pcie_match,
+ .pm = DEV_PM_OPS,
},
};
--
1.7.9.5
next prev parent reply other threads:[~2015-07-24 11:53 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-24 11:53 [PATCH v2 0/3] dra7xx: Add PM support to PCIe Kishon Vijay Abraham I
2015-07-24 11:53 ` [PATCH v2 1/3] PCI: host: pci-dra7xx: Disable pm_runtime on get_sync failure Kishon Vijay Abraham I
2015-07-24 11:53 ` Kishon Vijay Abraham I [this message]
2015-07-24 11:53 ` [PATCH v2 3/3] PCI: host: pci-dra7xx: Idle the module by disabling MSE bit Kishon Vijay Abraham I
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