This commit adds runtime and system power management support for
chipidea core. The runtime pm support is controlled by glue
layer, it can be enabled by flag CI_HDRC_SUPPORTS_RUNTIME_PM.
Signed-off-by: Peter Chen <peter.chen@xxxxxxxxxxxxx>
---
drivers/usb/chipidea/ci.h | 2 +
drivers/usb/chipidea/core.c | 119 ++++++++++++++++++++++++++++++++++++++++++
include/linux/usb/chipidea.h | 1 +
3 files changed, 122 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/chipidea/ci.h b/drivers/usb/chipidea/ci.h
index f9b1914..f296d66 100644
--- a/drivers/usb/chipidea/ci.h
+++ b/drivers/usb/chipidea/ci.h
@@ -175,6 +175,8 @@ struct ci_hdrc {
bool b_sess_valid_event;
/* imx28 needs swp instruction for writing */
bool imx28_write_fix;
+ bool supports_runtime_pm;
+ bool in_lpm;
};
static inline struct ci_role_driver *ci_role(struct ci_hdrc *ci)
diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index e26e616..b05470f 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -583,6 +583,10 @@ static int ci_hdrc_probe(struct platform_device *pdev)
hw_phymode_configure(ci);
dr_mode = ci->platdata->dr_mode;
+
+ ci->supports_runtime_pm = !!(ci->platdata->flags &
+ CI_HDRC_SUPPORTS_RUNTIME_PM);
+
/* initialize role(s) before the interrupt is requested */
if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_HOST) {
ret = ci_hdrc_host_init(ci);
@@ -656,6 +660,13 @@ static int ci_hdrc_probe(struct platform_device *pdev)
if (ret)
goto stop;
+ device_set_wakeup_capable(&pdev->dev, true);
+
+ if (ci->supports_runtime_pm) {
+ pm_runtime_set_active(&pdev->dev);
+ pm_runtime_enable(&pdev->dev);
+ }
+
ret = dbg_create_files(ci);
if (!ret)
return 0;
@@ -673,6 +684,11 @@ static int ci_hdrc_remove(struct platform_device *pdev)
{
struct ci_hdrc *ci = platform_get_drvdata(pdev);
+ if (ci->supports_runtime_pm) {
+ pm_runtime_get_sync(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+ pm_runtime_put_noidle(&pdev->dev);
+ }
dbg_remove_files(ci);
free_irq(ci->irq, ci);
ci_role_destroy(ci);
@@ -683,11 +699,114 @@ static int ci_hdrc_remove(struct platform_device *pdev)
return 0;
}
+#ifdef CONFIG_PM
+static int ci_controller_suspend(struct device *dev)
+{
+ struct ci_hdrc *ci = dev_get_drvdata(dev);
+
+ dev_dbg(dev, "at %s\n", __func__);
+
+ if (ci->in_lpm)
+ return 0;
+
+ disable_irq(ci->irq);
+
+ if (ci->transceiver)
+ usb_phy_set_wakeup(ci->transceiver, true);
+
+ ci_hdrc_enter_lpm(ci, true);
+
+ if (ci->transceiver)
+ usb_phy_set_suspend(ci->transceiver, 1);
+
+ ci->in_lpm = true;
+
+ enable_irq(ci->irq);
+
+ return 0;
+}
+
+static int ci_controller_resume(struct device *dev)
+{
+ struct ci_hdrc *ci = dev_get_drvdata(dev);
+
+ dev_dbg(dev, "at %s\n", __func__);
+
+ if (!ci->in_lpm)
+ return 0;
+
+ ci_hdrc_enter_lpm(ci, false);
+
+ if (ci->transceiver) {
+ usb_phy_set_suspend(ci->transceiver, 0);
+ usb_phy_set_wakeup(ci->transceiver, false);
+ }
+
+ ci->in_lpm = false;
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int ci_suspend(struct device *dev)
+{
+ struct ci_hdrc *ci = dev_get_drvdata(dev);
+ int ret;
+
+ ret = ci_controller_suspend(dev);
+ if (ret)
+ return ret;
+
+ if (device_may_wakeup(dev))
+ enable_irq_wake(ci->irq);
+
+ return ret;
+}
+
+static int ci_resume(struct device *dev)
+{
+ struct ci_hdrc *ci = dev_get_drvdata(dev);
+ int ret;
+
+ if (device_may_wakeup(dev))
+ disable_irq_wake(ci->irq);
+
+ ret = ci_controller_resume(dev);
+ if (!ret && ci->supports_runtime_pm) {
+ pm_runtime_disable(dev);
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
+ }
+
+ return ret;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+#ifdef CONFIG_PM_RUNTIME
+static int ci_runtime_suspend(struct device *dev)
+{
+ return ci_controller_suspend(dev);
+}
+
+static int ci_runtime_resume(struct device *dev)
+{
+ return ci_controller_resume(dev);
+}
+#endif /* CONFIG_PM_RUNTIME */
+
+#endif /* CONFIG_PM */
+static const struct dev_pm_ops ci_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(ci_suspend, ci_resume)
+ SET_RUNTIME_PM_OPS(ci_runtime_suspend,
+ ci_runtime_resume, NULL)
+};
+
static struct platform_driver ci_hdrc_driver = {
.probe = ci_hdrc_probe,
.remove = ci_hdrc_remove,
.driver = {
.name = "ci_hdrc",
+ .pm = &ci_pm_ops,
},
};
diff --git a/include/linux/usb/chipidea.h b/include/linux/usb/chipidea.h
index 708bd11..3842431 100644
--- a/include/linux/usb/chipidea.h
+++ b/include/linux/usb/chipidea.h
@@ -18,6 +18,7 @@ struct ci_hdrc_platform_data {
unsigned long flags;
#define CI_HDRC_REGS_SHARED BIT(0)
#define CI_HDRC_REQUIRE_TRANSCEIVER BIT(1)
+#define CI_HDRC_SUPPORTS_RUNTIME_PM BIT(2)
#define CI_HDRC_DISABLE_STREAMING BIT(3)
/*
* Only set it when DCCPARAMS.DC==1 and DCCPARAMS.HC==1,
--
1.7.1
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