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Date: Fri, 9 Apr 2021 16:54:01 +0800
From: Chunfeng Yun <chunfeng.yun@...iatek.com>
To: Ikjoon Jang <ikjn@...omium.org>
CC: Rob Herring <robh+dt@...nel.org>,
Mathias Nyman <mathias.nyman@...el.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Matthias Brugger <matthias.bgg@...il.com>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
<linux-usb@...r.kernel.org>,
"moderated list:ARM/Mediatek SoC support"
<linux-arm-kernel@...ts.infradead.org>,
"moderated list:ARM/Mediatek SoC support"
<linux-mediatek@...ts.infradead.org>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@...r.kernel.org>,
open list <linux-kernel@...r.kernel.org>,
<linux-pm@...r.kernel.org>, Tony Lindgren <tony@...mide.com>,
Tianping Fang <tianping.fang@...iatek.com>,
Eddie Hung <eddie.hung@...iatek.com>,
Nicolas Boichat <drinkcat@...omium.org>
Subject: Re: [PATCH 4/6] usb: xhci-mtk: add support runtime PM
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@...iatek.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@...iatek.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
>
> > + 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
> >
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