From: Théo Lebrun <theo.lebrun@xxxxxxxxxxx>
Add suspend and resume support for rc mode.
Signed-off-by: Théo Lebrun <theo.lebrun@xxxxxxxxxxx>
Signed-off-by: Thomas Richard <thomas.richard@xxxxxxxxxxx>
---
drivers/pci/controller/cadence/pci-j721e.c | 72 +++++++++++++++++++++++++++
drivers/pci/controller/cadence/pcie-cadence.h | 3 +-
2 files changed, 74 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/controller/cadence/pci-j721e.c b/drivers/pci/controller/cadence/pci-j721e.c
index 477275d72257..51867a3f2499 100644
--- a/drivers/pci/controller/cadence/pci-j721e.c
+++ b/drivers/pci/controller/cadence/pci-j721e.c
@@ -6,6 +6,7 @@
* Author: Kishon Vijay Abraham I <kishon@xxxxxx>
*/
+#include <linux/clk-provider.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
@@ -554,6 +555,76 @@ static void j721e_pcie_remove(struct platform_device *pdev)
pm_runtime_disable(dev);
}
+#ifdef CONFIG_PM
+static int j721e_pcie_suspend_noirq(struct device *dev)
+{
+ struct j721e_pcie *pcie = dev_get_drvdata(dev);
+
+ if (pcie->mode == PCI_MODE_RC) {
+ if (pcie->reset_gpio)
+ gpiod_set_value_cansleep(pcie->reset_gpio, 0);
+
+ clk_disable_unprepare(pcie->refclk);
+ }
+
+ cdns_pcie_disable_phy(pcie->cdns_pcie);
+
+ return 0;
+}
+
+static int j721e_pcie_resume_noirq(struct device *dev)
+{
+ struct j721e_pcie *pcie = dev_get_drvdata(dev);
+ struct cdns_pcie *cdns_pcie = pcie->cdns_pcie;
+ int ret;
+
+ ret = j721e_pcie_ctrl_init(pcie);
+ if (ret < 0) {
+ dev_err(dev, "j721e_pcie_ctrl_init failed\n");
+ return ret;
+ }
+
+ j721e_pcie_config_link_irq(pcie);
+
+ /*
+ * This is not called explicitly in the probe, it is called by
+ * cdns_pcie_init_phy.
+ */
+ ret = cdns_pcie_enable_phy(pcie->cdns_pcie);
+ if (ret < 0) {
+ dev_err(dev, "cdns_pcie_enable_phy failed\n");
+ return -ENODEV;
+ }
+
+ if (pcie->mode == PCI_MODE_RC) {
+ struct cdns_pcie_rc *rc = cdns_pcie_to_rc(cdns_pcie);
+
+ ret = clk_prepare_enable(pcie->refclk);
+ if (ret < 0) {
+ dev_err(dev, "clk_prepare_enable failed\n");
+ return -ENODEV;
+ }
+
+ if (pcie->reset_gpio) {
+ usleep_range(100, 200);
+ gpiod_set_value_cansleep(pcie->reset_gpio, 1);
+ }
+
+ ret = cdns_pcie_host_setup(rc, false);
+ if (ret < 0) {
+ clk_disable_unprepare(pcie->refclk);
+ return -ENODEV;
+ }
+ }
+
+ return 0;
+}
+
+static const struct dev_pm_ops j721e_pcie_pm_ops = {
+ SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(j721e_pcie_suspend_noirq, j721e_pcie_resume_noirq)
+};
+#endif
+
static struct platform_driver j721e_pcie_driver = {
.probe = j721e_pcie_probe,
.remove_new = j721e_pcie_remove,
@@ -561,6 +632,7 @@ static struct platform_driver j721e_pcie_driver = {
.name = "j721e-pcie",
.of_match_table = of_j721e_pcie_match,
.suppress_bind_attrs = true,
+ .pm = pm_ptr(&j721e_pcie_pm_ops),
},
};
builtin_platform_driver(j721e_pcie_driver);
diff --git a/drivers/pci/controller/cadence/pcie-cadence.h b/drivers/pci/controller/cadence/pcie-cadence.h
index 3b0da889ed64..05d4b96fc71d 100644
--- a/drivers/pci/controller/cadence/pcie-cadence.h
+++ b/drivers/pci/controller/cadence/pcie-cadence.h
@@ -331,6 +331,8 @@ struct cdns_pcie_rc {
unsigned int quirk_detect_quiet_flag:1;
};
+#define cdns_pcie_to_rc(p) container_of(p, struct cdns_pcie_rc, pcie)
+
/**
* struct cdns_pcie_epf - Structure to hold info about endpoint function
* @epf: Info about virtual functions attached to the physical function
@@ -381,7 +383,6 @@ struct cdns_pcie_ep {
unsigned int quirk_disable_flr:1;
};
-
/* Register access */
static inline void cdns_pcie_writel(struct cdns_pcie *pcie, u32 reg, u32 value)
{
--
2.39.2
