| Message ID | 1617874514-12282-4-git-send-email-chunfeng.yun@mediatek.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [1/6] PM: runtime: enable wake irq after runtime_suspend hook called | expand |
On Fri, Apr 9, 2021 at 4:54 PM Chunfeng Yun <chunfeng.yun@mediatek.com> wrote: > > On Fri, 2021-04-09 at 13:45 +0800, Ikjoon Jang wrote: > > On Thu, Apr 8, 2021 at 5:35 PM Chunfeng Yun <chunfeng.yun@mediatek.com> wrote: > > > > > > A dedicated wakeup irq will be used to handle runtime suspend/resume, > > > we use dev_pm_set_dedicated_wake_irq API to take care of requesting > > > and attaching wakeup irq, then the suspend/resume framework will help > > > to enable/disable wakeup irq. > > > > > > The runtime PM is default off since some platforms may not support it. > > > users can enable it via power/control (set "auto") in sysfs. > > > > > > Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com> > > > --- > > > drivers/usb/host/xhci-mtk.c | 140 +++++++++++++++++++++++++++++++----- > > > 1 file changed, 124 insertions(+), 16 deletions(-) > > > > > > diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c > > > index a74764ab914a..30927f4064d4 100644 > > > --- a/drivers/usb/host/xhci-mtk.c > > > +++ b/drivers/usb/host/xhci-mtk.c > > > @@ -16,6 +16,7 @@ > > > #include <linux/of.h> > > > #include <linux/platform_device.h> > > > #include <linux/pm_runtime.h> > > > +#include <linux/pm_wakeirq.h> > > > #include <linux/regmap.h> > > > #include <linux/regulator/consumer.h> > > > > > > @@ -358,7 +359,6 @@ static int usb_wakeup_of_property_parse(struct xhci_hcd_mtk *mtk, > > > mtk->uwk_reg_base, mtk->uwk_vers); > > > > > > return PTR_ERR_OR_ZERO(mtk->uwk); > > > - > > > } > > > > > > static void usb_wakeup_set(struct xhci_hcd_mtk *mtk, bool enable) > > > @@ -458,6 +458,7 @@ static int xhci_mtk_probe(struct platform_device *pdev) > > > struct resource *res; > > > struct usb_hcd *hcd; > > > int ret = -ENODEV; > > > + int wakeup_irq; > > > int irq; > > > > > > if (usb_disabled()) > > > @@ -485,6 +486,21 @@ static int xhci_mtk_probe(struct platform_device *pdev) > > > if (ret) > > > return ret; > > > > > > + irq = platform_get_irq_byname_optional(pdev, "host"); > > > + if (irq < 0) { > > > + if (irq == -EPROBE_DEFER) > > > + return irq; > > > + > > > + /* for backward compatibility */ > > > + irq = platform_get_irq(pdev, 0); > > > + if (irq < 0) > > > + return irq; > > > + } > > > + > > > + wakeup_irq = platform_get_irq_byname_optional(pdev, "wakeup"); > > > + if (wakeup_irq == -EPROBE_DEFER) > > > + return wakeup_irq; > > > + > > > mtk->lpm_support = of_property_read_bool(node, "usb3-lpm-capable"); > > > /* optional property, ignore the error if it does not exist */ > > > of_property_read_u32(node, "mediatek,u3p-dis-msk", > > > @@ -496,9 +512,11 @@ static int xhci_mtk_probe(struct platform_device *pdev) > > > return ret; > > > } > > > > > > + 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 = xhci_mtk_ldos_enable(mtk); > > > if (ret) > > > @@ -508,12 +526,6 @@ static int xhci_mtk_probe(struct platform_device *pdev) > > > if (ret) > > > goto disable_ldos; > > > > > > - irq = platform_get_irq(pdev, 0); > > > - if (irq < 0) { > > > - ret = irq; > > > - goto disable_clk; > > > - } > > > - > > > hcd = usb_create_hcd(driver, dev, dev_name(dev)); > > > if (!hcd) { > > > ret = -ENOMEM; > > > @@ -579,8 +591,26 @@ static int xhci_mtk_probe(struct platform_device *pdev) > > > if (ret) > > > goto dealloc_usb2_hcd; > > > > > > + if (wakeup_irq > 0) { > > > + ret = dev_pm_set_dedicated_wake_irq(dev, wakeup_irq); > > > + if (ret) { > > > + dev_err(dev, "set wakeup irq %d failed\n", wakeup_irq); > > > + goto dealloc_usb3_hcd; > > > + } > > > + dev_info(dev, "wakeup irq %d\n", wakeup_irq); > > > + } > > > + > > > + device_enable_async_suspend(dev); > > > + pm_runtime_mark_last_busy(dev); > > > + pm_runtime_put_autosuspend(dev); > > > + pm_runtime_forbid(dev); > > > + > > > return 0; > > > > > > +dealloc_usb3_hcd: > > > + usb_remove_hcd(xhci->shared_hcd); > > > + xhci->shared_hcd = NULL; > > > + > > > dealloc_usb2_hcd: > > > usb_remove_hcd(hcd); > > > > > > @@ -601,25 +631,26 @@ static int xhci_mtk_probe(struct platform_device *pdev) > > > xhci_mtk_ldos_disable(mtk); > > > > > > disable_pm: > > > - pm_runtime_put_sync(dev); > > > + pm_runtime_put_sync_autosuspend(dev); > > > pm_runtime_disable(dev); > > > return ret; > > > } > > > > > > -static int xhci_mtk_remove(struct platform_device *dev) > > > +static int xhci_mtk_remove(struct platform_device *pdev) > > > { > > > - struct xhci_hcd_mtk *mtk = platform_get_drvdata(dev); > > > + struct xhci_hcd_mtk *mtk = platform_get_drvdata(pdev); > > > struct usb_hcd *hcd = mtk->hcd; > > > struct xhci_hcd *xhci = hcd_to_xhci(hcd); > > > struct usb_hcd *shared_hcd = xhci->shared_hcd; > > > + struct device *dev = &pdev->dev; > > > > > > - pm_runtime_put_noidle(&dev->dev); > > > - pm_runtime_disable(&dev->dev); > > > + pm_runtime_get_sync(dev); > > > + xhci->xhc_state |= XHCI_STATE_REMOVING; > > > + dev_pm_clear_wake_irq(dev); > > > + device_init_wakeup(dev, false); > > > > > > usb_remove_hcd(shared_hcd); > > > xhci->shared_hcd = NULL; > > > - device_init_wakeup(&dev->dev, false); > > > - > > > usb_remove_hcd(hcd); > > > usb_put_hcd(shared_hcd); > > > usb_put_hcd(hcd); > > > @@ -627,6 +658,10 @@ static int xhci_mtk_remove(struct platform_device *dev) > > > xhci_mtk_clks_disable(mtk); > > > xhci_mtk_ldos_disable(mtk); > > > > > > + pm_runtime_disable(dev); > > > + pm_runtime_put_noidle(dev); > > > + pm_runtime_set_suspended(dev); > > > + > > > return 0; > > > } > > > > > > @@ -690,10 +725,83 @@ static int __maybe_unused xhci_mtk_resume(struct device *dev) > > > return ret; > > > } > > > > > > +static int check_rhub_status(struct xhci_hcd *xhci, struct xhci_hub *rhub) > > > +{ > > > + u32 suspended_ports; > > > + u32 status; > > > + int num_ports; > > > + int i; > > > + > > > + num_ports = rhub->num_ports; > > > + suspended_ports = rhub->bus_state.suspended_ports; > > > + for (i = 0; i < num_ports; i++) { > > > + if (!(suspended_ports & BIT(i))) { > > > + status = readl(rhub->ports[i]->addr); > > > + if (status & PORT_CONNECT) > > > > So this pm_runtime support is activated only when there's no devices > > connected at all? > No, if the connected devices also support runtime suspend, it will enter > suspend mode when no data transfer, then the controller can enter > suspend too > > I think this will always return -EBUSY with my board having an on-board hub > > connected to both rhubs. > the on-board hub supports runtime suspend by default, so if no devices > connected, it will enter suspend Sorry, you're correct. I was confused that the condition was (suspended && connect) My on-board hub connected to rhub is always in a suspended state whenever it's called. However, I don't think this could return -EBUSY rpm_suspend() only be called when all the descendants are in sleep already. Did you see any cases of this function returning -EBUSY or any concerns on here? > > > > > > + return -EBUSY; > > > + } > > > + } > > > + > > > + return 0; > > > +} > > > + > > > +/* > > > + * check the bus whether it could suspend or not > > > + * the bus will suspend if the downstream ports are already suspended, > > > + * or no devices connected. > > > + */ > > > +static int check_bus_status(struct xhci_hcd *xhci) > > > +{ > > > + int ret; > > > + > > > + ret = check_rhub_status(xhci, &xhci->usb3_rhub); > > > + if (ret) > > > + return ret; > > > + > > > + return check_rhub_status(xhci, &xhci->usb2_rhub); > > > +} > > > + > > > +static int __maybe_unused xhci_mtk_runtime_suspend(struct device *dev) > > > +{ > > > + struct xhci_hcd_mtk *mtk = dev_get_drvdata(dev); > > > + struct xhci_hcd *xhci = hcd_to_xhci(mtk->hcd); > > > + int ret = 0; > > > + > > > + if (xhci->xhc_state) > > > + return -ESHUTDOWN; > > > + > > > + if (device_may_wakeup(dev)) { > > > + ret = check_bus_status(xhci); > > > + if (!ret) > > > + ret = xhci_mtk_suspend(dev); > > > + } > > > + > > > + /* -EBUSY: let PM automatically reschedule another autosuspend */ > > > + return ret ? -EBUSY : 0; > > > +} > > > + > > > +static int __maybe_unused xhci_mtk_runtime_resume(struct device *dev) > > > +{ > > > + struct xhci_hcd_mtk *mtk = dev_get_drvdata(dev); > > > + struct xhci_hcd *xhci = hcd_to_xhci(mtk->hcd); > > > + int ret = 0; > > > + > > > + if (xhci->xhc_state) > > > + return -ESHUTDOWN; > > > + > > > + if (device_may_wakeup(dev)) > > > + ret = xhci_mtk_resume(dev); > > > + > > > + return ret; > > > +} > > > + > > > static const struct dev_pm_ops xhci_mtk_pm_ops = { > > > SET_SYSTEM_SLEEP_PM_OPS(xhci_mtk_suspend, xhci_mtk_resume) > > > + SET_RUNTIME_PM_OPS(xhci_mtk_runtime_suspend, > > > + xhci_mtk_runtime_resume, NULL) > > > }; > > > -#define DEV_PM_OPS IS_ENABLED(CONFIG_PM) ? &xhci_mtk_pm_ops : NULL > > > + > > > +#define DEV_PM_OPS (IS_ENABLED(CONFIG_PM) ? &xhci_mtk_pm_ops : NULL) > > > > > > static const struct of_device_id mtk_xhci_of_match[] = { > > > { .compatible = "mediatek,mt8173-xhci"}, > > > -- > > > 2.18.0 > > > >
On Mon, 2021-04-12 at 13:14 +0800, Ikjoon Jang wrote: > On Fri, Apr 9, 2021 at 4:54 PM Chunfeng Yun <chunfeng.yun@mediatek.com> wrote: > > > > On Fri, 2021-04-09 at 13:45 +0800, Ikjoon Jang wrote: > > > On Thu, Apr 8, 2021 at 5:35 PM Chunfeng Yun <chunfeng.yun@mediatek.com> wrote: > > > > > > > > A dedicated wakeup irq will be used to handle runtime suspend/resume, > > > > we use dev_pm_set_dedicated_wake_irq API to take care of requesting > > > > and attaching wakeup irq, then the suspend/resume framework will help > > > > to enable/disable wakeup irq. > > > > > > > > The runtime PM is default off since some platforms may not support it. > > > > users can enable it via power/control (set "auto") in sysfs. > > > > > > > > Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com> > > > > --- > > > > drivers/usb/host/xhci-mtk.c | 140 +++++++++++++++++++++++++++++++----- > > > > 1 file changed, 124 insertions(+), 16 deletions(-) > > > > > > > > diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c > > > > index a74764ab914a..30927f4064d4 100644 > > > > --- a/drivers/usb/host/xhci-mtk.c > > > > +++ b/drivers/usb/host/xhci-mtk.c [...] > > > > > > > > +static int check_rhub_status(struct xhci_hcd *xhci, struct xhci_hub *rhub) > > > > +{ > > > > + u32 suspended_ports; > > > > + u32 status; > > > > + int num_ports; > > > > + int i; > > > > + > > > > + num_ports = rhub->num_ports; > > > > + suspended_ports = rhub->bus_state.suspended_ports; > > > > + for (i = 0; i < num_ports; i++) { > > > > + if (!(suspended_ports & BIT(i))) { > > > > + status = readl(rhub->ports[i]->addr); > > > > + if (status & PORT_CONNECT) > > > > > > So this pm_runtime support is activated only when there's no devices > > > connected at all? > > No, if the connected devices also support runtime suspend, it will enter > > suspend mode when no data transfer, then the controller can enter > > suspend too > > > I think this will always return -EBUSY with my board having an on-board hub > > > connected to both rhubs. > > the on-board hub supports runtime suspend by default, so if no devices > > connected, it will enter suspend > > Sorry, you're correct. I was confused that the condition was > (suspended && connect) > My on-board hub connected to rhub is always in a suspended state > whenever it's called. > > However, I don't think this could return -EBUSY > rpm_suspend() only be called when all the descendants are in sleep already. You mean we can drop the bus check? If PM already takes care of children count, I think no need check it anymore. > Did you see any cases of this function returning -EBUSY or any concerns on here? No, I didn't see it before. Thanks > > > > > > > > > > > + return -EBUSY; > > > > + } > > > > + } > > > > + > > > > + return 0; > > > > +} > > > > + > > > > +/* > > > > + * check the bus whether it could suspend or not > > > > + * the bus will suspend if the downstream ports are already suspended, > > > > + * or no devices connected. > > > > + */ > > > > +static int check_bus_status(struct xhci_hcd *xhci) > > > > +{ > > > > + int ret; > > > > + > > > > + ret = check_rhub_status(xhci, &xhci->usb3_rhub); > > > > + if (ret) > > > > + return ret; > > > > + > > > > + return check_rhub_status(xhci, &xhci->usb2_rhub); > > > > +} > > > > + > > > > +static int __maybe_unused xhci_mtk_runtime_suspend(struct device *dev) > > > > +{ > > > > + struct xhci_hcd_mtk *mtk = dev_get_drvdata(dev); > > > > + struct xhci_hcd *xhci = hcd_to_xhci(mtk->hcd); > > > > + int ret = 0; > > > > + > > > > + if (xhci->xhc_state) > > > > + return -ESHUTDOWN; > > > > + > > > > + if (device_may_wakeup(dev)) { > > > > + ret = check_bus_status(xhci); > > > > + if (!ret) > > > > + ret = xhci_mtk_suspend(dev); > > > > + } > > > > + > > > > + /* -EBUSY: let PM automatically reschedule another autosuspend */ > > > > + return ret ? -EBUSY : 0; > > > > +} > > > > + > > > > +static int __maybe_unused xhci_mtk_runtime_resume(struct device *dev) > > > > +{ > > > > + struct xhci_hcd_mtk *mtk = dev_get_drvdata(dev); > > > > + struct xhci_hcd *xhci = hcd_to_xhci(mtk->hcd); > > > > + int ret = 0; > > > > + > > > > + if (xhci->xhc_state) > > > > + return -ESHUTDOWN; > > > > + > > > > + if (device_may_wakeup(dev)) > > > > + ret = xhci_mtk_resume(dev); > > > > + > > > > + return ret; > > > > +} > > > > + > > > > static const struct dev_pm_ops xhci_mtk_pm_ops = { > > > > SET_SYSTEM_SLEEP_PM_OPS(xhci_mtk_suspend, xhci_mtk_resume) > > > > + SET_RUNTIME_PM_OPS(xhci_mtk_runtime_suspend, > > > > + xhci_mtk_runtime_resume, NULL) > > > > }; > > > > -#define DEV_PM_OPS IS_ENABLED(CONFIG_PM) ? &xhci_mtk_pm_ops : NULL > > > > + > > > > +#define DEV_PM_OPS (IS_ENABLED(CONFIG_PM) ? &xhci_mtk_pm_ops : NULL) > > > > > > > > static const struct of_device_id mtk_xhci_of_match[] = { > > > > { .compatible = "mediatek,mt8173-xhci"}, > > > > -- > > > > 2.18.0 > > > > > >
diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c index a74764ab914a..30927f4064d4 100644 --- a/drivers/usb/host/xhci-mtk.c +++ b/drivers/usb/host/xhci-mtk.c @@ -16,6 +16,7 @@ #include <linux/of.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> +#include <linux/pm_wakeirq.h> #include <linux/regmap.h> #include <linux/regulator/consumer.h> @@ -358,7 +359,6 @@ static int usb_wakeup_of_property_parse(struct xhci_hcd_mtk *mtk, mtk->uwk_reg_base, mtk->uwk_vers); return PTR_ERR_OR_ZERO(mtk->uwk); - } static void usb_wakeup_set(struct xhci_hcd_mtk *mtk, bool enable) @@ -458,6 +458,7 @@ static int xhci_mtk_probe(struct platform_device *pdev) struct resource *res; struct usb_hcd *hcd; int ret = -ENODEV; + int wakeup_irq; int irq; if (usb_disabled()) @@ -485,6 +486,21 @@ static int xhci_mtk_probe(struct platform_device *pdev) if (ret) return ret; + irq = platform_get_irq_byname_optional(pdev, "host"); + if (irq < 0) { + if (irq == -EPROBE_DEFER) + return irq; + + /* for backward compatibility */ + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + } + + wakeup_irq = platform_get_irq_byname_optional(pdev, "wakeup"); + if (wakeup_irq == -EPROBE_DEFER) + return wakeup_irq; + mtk->lpm_support = of_property_read_bool(node, "usb3-lpm-capable"); /* optional property, ignore the error if it does not exist */ of_property_read_u32(node, "mediatek,u3p-dis-msk", @@ -496,9 +512,11 @@ static int xhci_mtk_probe(struct platform_device *pdev) return ret; } + 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 = xhci_mtk_ldos_enable(mtk); if (ret) @@ -508,12 +526,6 @@ static int xhci_mtk_probe(struct platform_device *pdev) if (ret) goto disable_ldos; - irq = platform_get_irq(pdev, 0); - if (irq < 0) { - ret = irq; - goto disable_clk; - } - hcd = usb_create_hcd(driver, dev, dev_name(dev)); if (!hcd) { ret = -ENOMEM; @@ -579,8 +591,26 @@ static int xhci_mtk_probe(struct platform_device *pdev) if (ret) goto dealloc_usb2_hcd; + if (wakeup_irq > 0) { + ret = dev_pm_set_dedicated_wake_irq(dev, wakeup_irq); + if (ret) { + dev_err(dev, "set wakeup irq %d failed\n", wakeup_irq); + goto dealloc_usb3_hcd; + } + dev_info(dev, "wakeup irq %d\n", wakeup_irq); + } + + device_enable_async_suspend(dev); + pm_runtime_mark_last_busy(dev); + pm_runtime_put_autosuspend(dev); + pm_runtime_forbid(dev); + return 0; +dealloc_usb3_hcd: + usb_remove_hcd(xhci->shared_hcd); + xhci->shared_hcd = NULL; + dealloc_usb2_hcd: usb_remove_hcd(hcd); @@ -601,25 +631,26 @@ static int xhci_mtk_probe(struct platform_device *pdev) xhci_mtk_ldos_disable(mtk); disable_pm: - pm_runtime_put_sync(dev); + pm_runtime_put_sync_autosuspend(dev); pm_runtime_disable(dev); return ret; } -static int xhci_mtk_remove(struct platform_device *dev) +static int xhci_mtk_remove(struct platform_device *pdev) { - struct xhci_hcd_mtk *mtk = platform_get_drvdata(dev); + struct xhci_hcd_mtk *mtk = platform_get_drvdata(pdev); struct usb_hcd *hcd = mtk->hcd; struct xhci_hcd *xhci = hcd_to_xhci(hcd); struct usb_hcd *shared_hcd = xhci->shared_hcd; + struct device *dev = &pdev->dev; - pm_runtime_put_noidle(&dev->dev); - pm_runtime_disable(&dev->dev); + pm_runtime_get_sync(dev); + xhci->xhc_state |= XHCI_STATE_REMOVING; + dev_pm_clear_wake_irq(dev); + device_init_wakeup(dev, false); usb_remove_hcd(shared_hcd); xhci->shared_hcd = NULL; - device_init_wakeup(&dev->dev, false); - usb_remove_hcd(hcd); usb_put_hcd(shared_hcd); usb_put_hcd(hcd); @@ -627,6 +658,10 @@ static int xhci_mtk_remove(struct platform_device *dev) xhci_mtk_clks_disable(mtk); xhci_mtk_ldos_disable(mtk); + pm_runtime_disable(dev); + pm_runtime_put_noidle(dev); + pm_runtime_set_suspended(dev); + return 0; } @@ -690,10 +725,83 @@ static int __maybe_unused xhci_mtk_resume(struct device *dev) return ret; } +static int check_rhub_status(struct xhci_hcd *xhci, struct xhci_hub *rhub) +{ + u32 suspended_ports; + u32 status; + int num_ports; + int i; + + num_ports = rhub->num_ports; + suspended_ports = rhub->bus_state.suspended_ports; + for (i = 0; i < num_ports; i++) { + if (!(suspended_ports & BIT(i))) { + status = readl(rhub->ports[i]->addr); + if (status & PORT_CONNECT) + return -EBUSY; + } + } + + return 0; +} + +/* + * check the bus whether it could suspend or not + * the bus will suspend if the downstream ports are already suspended, + * or no devices connected. + */ +static int check_bus_status(struct xhci_hcd *xhci) +{ + int ret; + + ret = check_rhub_status(xhci, &xhci->usb3_rhub); + if (ret) + return ret; + + return check_rhub_status(xhci, &xhci->usb2_rhub); +} + +static int __maybe_unused xhci_mtk_runtime_suspend(struct device *dev) +{ + struct xhci_hcd_mtk *mtk = dev_get_drvdata(dev); + struct xhci_hcd *xhci = hcd_to_xhci(mtk->hcd); + int ret = 0; + + if (xhci->xhc_state) + return -ESHUTDOWN; + + if (device_may_wakeup(dev)) { + ret = check_bus_status(xhci); + if (!ret) + ret = xhci_mtk_suspend(dev); + } + + /* -EBUSY: let PM automatically reschedule another autosuspend */ + return ret ? -EBUSY : 0; +} + +static int __maybe_unused xhci_mtk_runtime_resume(struct device *dev) +{ + struct xhci_hcd_mtk *mtk = dev_get_drvdata(dev); + struct xhci_hcd *xhci = hcd_to_xhci(mtk->hcd); + int ret = 0; + + if (xhci->xhc_state) + return -ESHUTDOWN; + + if (device_may_wakeup(dev)) + ret = xhci_mtk_resume(dev); + + return ret; +} + static const struct dev_pm_ops xhci_mtk_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS(xhci_mtk_suspend, xhci_mtk_resume) + SET_RUNTIME_PM_OPS(xhci_mtk_runtime_suspend, + xhci_mtk_runtime_resume, NULL) }; -#define DEV_PM_OPS IS_ENABLED(CONFIG_PM) ? &xhci_mtk_pm_ops : NULL + +#define DEV_PM_OPS (IS_ENABLED(CONFIG_PM) ? &xhci_mtk_pm_ops : NULL) static const struct of_device_id mtk_xhci_of_match[] = { { .compatible = "mediatek,mt8173-xhci"},
A dedicated wakeup irq will be used to handle runtime suspend/resume, we use dev_pm_set_dedicated_wake_irq API to take care of requesting and attaching wakeup irq, then the suspend/resume framework will help to enable/disable wakeup irq. The runtime PM is default off since some platforms may not support it. users can enable it via power/control (set "auto") in sysfs. Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com> --- drivers/usb/host/xhci-mtk.c | 140 +++++++++++++++++++++++++++++++----- 1 file changed, 124 insertions(+), 16 deletions(-)