[PATCH v2 10/13] usb: mtu3: support runtime PM for host mode

Chunfeng Yun
2021-06-18T09:30:20Z

Use a dedicated wakeup irq for runtime suspend/resume, and interrupts
names are provided if using wakeup irq, this patch only support host
mode.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
---
v2: no changes
---
drivers/usb/mtu3/mtu3.h | 1 +
drivers/usb/mtu3/mtu3_core.c | 13 ++++++--
drivers/usb/mtu3/mtu3_plat.c | 62 +++++++++++++++++++++++++++++++++---
3 files changed, 68 insertions(+), 8 deletions(-)

diff --git a/drivers/usb/mtu3/mtu3.h b/drivers/usb/mtu3/mtu3.h
index 0ae9b33b50ea..171e5b383063 100644
--- a/drivers/usb/mtu3/mtu3.h
+++ b/drivers/usb/mtu3/mtu3.h
@@ -246,6 +246,7 @@ struct ssusb_mtk {
void __iomem *ippc_base;
struct phy **phys;
int num_phys;
+ int wakeup_irq;
/* common power & clock */
struct regulator *vusb33;
struct clk_bulk_data clks[BULK_CLKS_CNT];
diff --git a/drivers/usb/mtu3/mtu3_core.c b/drivers/usb/mtu3/mtu3_core.c
index 562f4357831e..6d23acb4fffc 100644
--- a/drivers/usb/mtu3/mtu3_core.c
+++ b/drivers/usb/mtu3/mtu3_core.c
@@ -888,9 +888,16 @@ int ssusb_gadget_init(struct ssusb_mtk *ssusb)
if (mtu == NULL)
return -ENOMEM;

- mtu->irq = platform_get_irq(pdev, 0);
- if (mtu->irq < 0)
- return mtu->irq;
+ mtu->irq = platform_get_irq_byname_optional(pdev, "device");
+ if (mtu->irq < 0) {
+ if (mtu->irq == -EPROBE_DEFER)
+ return mtu->irq;
+
+ /* for backward compatibility */
+ mtu->irq = platform_get_irq(pdev, 0);
+ if (mtu->irq < 0)
+ return mtu->irq;
+ }
dev_info(dev, "irq %d\n", mtu->irq);

mtu->mac_base = devm_platform_ioremap_resource_byname(pdev, "mac");
diff --git a/drivers/usb/mtu3/mtu3_plat.c b/drivers/usb/mtu3/mtu3_plat.c
index a906b24723e6..61d5c7cfd4db 100644
--- a/drivers/usb/mtu3/mtu3_plat.c
+++ b/drivers/usb/mtu3/mtu3_plat.c
@@ -12,6 +12,7 @@
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
+#include <linux/pm_wakeirq.h>

#include "mtu3.h"
#include "mtu3_dr.h"
@@ -208,6 +209,10 @@ static int get_ssusb_rscs(struct platform_device *pdev, struct ssusb_mtk *ssusb)
if (IS_ERR(ssusb->ippc_base))
return PTR_ERR(ssusb->ippc_base);

+ ssusb->wakeup_irq = platform_get_irq_byname_optional(pdev, "wakeup");
+ if (ssusb->wakeup_irq == -EPROBE_DEFER)
+ return ssusb->wakeup_irq;
+
ssusb->dr_mode = usb_get_dr_mode(dev);
if (ssusb->dr_mode == USB_DR_MODE_UNKNOWN)
ssusb->dr_mode = USB_DR_MODE_OTG;
@@ -295,14 +300,25 @@ static int mtu3_probe(struct platform_device *pdev)
ssusb_debugfs_create_root(ssusb);

/* enable power domain */
+ pm_runtime_set_active(dev);
+ pm_runtime_use_autosuspend(dev);
+ pm_runtime_set_autosuspend_delay(dev, 4000);
pm_runtime_enable(dev);
pm_runtime_get_sync(dev);
- device_enable_async_suspend(dev);

ret = ssusb_rscs_init(ssusb);
if (ret)
goto comm_init_err;

+ if (ssusb->wakeup_irq > 0) {
+ ret = dev_pm_set_dedicated_wake_irq(dev, ssusb->wakeup_irq);
+ if (ret) {
+ dev_err(dev, "failed to set wakeup irq %d\n", ssusb->wakeup_irq);
+ goto comm_exit;
+ }
+ dev_info(dev, "wakeup irq %d\n", ssusb->wakeup_irq);
+ }
+
ssusb_ip_sw_reset(ssusb);

if (IS_ENABLED(CONFIG_USB_MTU3_HOST))
@@ -353,6 +369,11 @@ static int mtu3_probe(struct platform_device *pdev)
goto comm_exit;
}

+ device_enable_async_suspend(dev);
+ pm_runtime_mark_last_busy(dev);
+ pm_runtime_put_autosuspend(dev);
+ pm_runtime_forbid(dev);
+
return 0;

host_exit:
@@ -373,6 +394,8 @@ static int mtu3_remove(struct platform_device *pdev)
{
struct ssusb_mtk *ssusb = platform_get_drvdata(pdev);

+ pm_runtime_get_sync(&pdev->dev);
+
switch (ssusb->dr_mode) {
case USB_DR_MODE_PERIPHERAL:
ssusb_gadget_exit(ssusb);
@@ -390,9 +413,10 @@ static int mtu3_remove(struct platform_device *pdev)
}

ssusb_rscs_exit(ssusb);
- pm_runtime_put_sync(&pdev->dev);
- pm_runtime_disable(&pdev->dev);
ssusb_debugfs_remove_root(ssusb);
+ pm_runtime_disable(&pdev->dev);
+ pm_runtime_put_noidle(&pdev->dev);
+ pm_runtime_set_suspended(&pdev->dev);

return 0;
}
@@ -401,7 +425,7 @@ static int mtu3_remove(struct platform_device *pdev)
* when support dual-role mode, we reject suspend when
* it works as device mode;
*/
-static int __maybe_unused mtu3_suspend(struct device *dev)
+static int mtu3_suspend_common(struct device *dev, pm_message_t msg)
{
struct ssusb_mtk *ssusb = dev_get_drvdata(dev);

@@ -419,7 +443,7 @@ static int __maybe_unused mtu3_suspend(struct device *dev)
return 0;
}

-static int __maybe_unused mtu3_resume(struct device *dev)
+static int mtu3_resume_common(struct device *dev, pm_message_t msg)
{
struct ssusb_mtk *ssusb = dev_get_drvdata(dev);
int ret;
@@ -448,8 +472,36 @@ static int __maybe_unused mtu3_resume(struct device *dev)
return ret;
}

+static int __maybe_unused mtu3_suspend(struct device *dev)
+{
+ return mtu3_suspend_common(dev, PMSG_SUSPEND);
+}
+
+static int __maybe_unused mtu3_resume(struct device *dev)
+{
+ return mtu3_resume_common(dev, PMSG_SUSPEND);
+}
+
+static int __maybe_unused mtu3_runtime_suspend(struct device *dev)
+{
+ if (!device_may_wakeup(dev))
+ return 0;
+
+ return mtu3_suspend_common(dev, PMSG_AUTO_SUSPEND);
+}
+
+static int __maybe_unused mtu3_runtime_resume(struct device *dev)
+{
+ if (!device_may_wakeup(dev))
+ return 0;
+
+ return mtu3_resume_common(dev, PMSG_AUTO_SUSPEND);
+}
+
static const struct dev_pm_ops mtu3_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(mtu3_suspend, mtu3_resume)
+ SET_RUNTIME_PM_OPS(mtu3_runtime_suspend,
+ mtu3_runtime_resume, NULL)
};

#define DEV_PM_OPS (IS_ENABLED(CONFIG_PM) ? &mtu3_pm_ops : NULL)
--
2.18.0