linux-kernel - Re: [PATCH] usb: host: plat: Enable xHCI plat runtime PM

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Date:   Mon, 10 Apr 2017 15:57:55 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     Mathias Nyman <mathias.nyman@...el.com>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        Mark Brown <broonie@...nel.org>,
        USB <linux-usb@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Baolin Wang <baolin.wang@...aro.org>
Subject: Re: [PATCH] usb: host: plat: Enable xHCI plat runtime PM

Hi Mathias,

On 30 March 2017 at 11:26, Baolin Wang <baolin.wang@...aro.org> wrote:
> Enable the xHCI plat runtime PM for parent device to suspend/resume
> xHCI. Also call pm_runtime_forbid() in probe() function to force users
> to explicitly enable runtime pm using power/control in sysfs, in case
> some parent devices didn't implement runtime PM callbacks.
>
> Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
> ---
>  drivers/usb/host/xhci-plat.c |   54 ++++++++++++++++++++++++++++++++++++------
>  1 file changed, 47 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
> index bd02a6c..2036c24 100644
> --- a/drivers/usb/host/xhci-plat.c
> +++ b/drivers/usb/host/xhci-plat.c
> @@ -179,9 +179,15 @@ static int xhci_plat_probe(struct platform_device *pdev)
>                         return ret;
>         }
>
> +       pm_runtime_set_active(&pdev->dev);
> +       pm_runtime_enable(&pdev->dev);
> +       pm_runtime_get_noresume(&pdev->dev);
> +
>         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
> -       if (!hcd)
> -               return -ENOMEM;
> +       if (!hcd) {
> +               ret = -ENOMEM;
> +               goto disable_runtime;
> +       }
>
>         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
> @@ -258,6 +264,14 @@ static int xhci_plat_probe(struct platform_device *pdev)
>         if (ret)
>                 goto dealloc_usb2_hcd;
>
> +       pm_runtime_put_noidle(&pdev->dev);
> +
> +       /*
> +        * Prevent runtime pm from being on as default, users should enable
> +        * runtime pm using power/control in sysfs.
> +        */
> +       pm_runtime_forbid(&pdev->dev);
> +
>         return 0;
>
>
> @@ -277,6 +291,10 @@ static int xhci_plat_probe(struct platform_device *pdev)
>  put_hcd:
>         usb_put_hcd(hcd);
>
> +disable_runtime:
> +       pm_runtime_put_noidle(&pdev->dev);
> +       pm_runtime_disable(&pdev->dev);
> +
>         return ret;
>  }
>
> @@ -298,6 +316,9 @@ static int xhci_plat_remove(struct platform_device *dev)
>                 clk_disable_unprepare(clk);
>         usb_put_hcd(hcd);
>
> +       pm_runtime_set_suspended(&dev->dev);
> +       pm_runtime_disable(&dev->dev);
> +
>         return 0;
>  }
>
> @@ -325,14 +346,33 @@ static int xhci_plat_resume(struct device *dev)
>
>         return xhci_resume(xhci, 0);
>  }
> +#endif /* CONFIG_PM_SLEEP */
> +
> +#ifdef CONFIG_PM
> +static int xhci_plat_runtime_suspend(struct device *dev)
> +{
> +       struct usb_hcd  *hcd = dev_get_drvdata(dev);
> +       struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> +
> +       return xhci_suspend(xhci, device_may_wakeup(dev));
> +}
> +
> +static int xhci_plat_runtime_resume(struct device *dev)
> +{
> +       struct usb_hcd  *hcd = dev_get_drvdata(dev);
> +       struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> +
> +       return xhci_resume(xhci, 0);
> +}
> +#endif /* CONFIG_PM */
>
>  static const struct dev_pm_ops xhci_plat_pm_ops = {
>         SET_SYSTEM_SLEEP_PM_OPS(xhci_plat_suspend, xhci_plat_resume)
> +
> +       SET_RUNTIME_PM_OPS(xhci_plat_runtime_suspend,
> +                          xhci_plat_runtime_resume,
> +                          NULL)
>  };
> -#define DEV_PM_OPS     (&xhci_plat_pm_ops)
> -#else
> -#define DEV_PM_OPS     NULL
> -#endif /* CONFIG_PM */
>
>  static const struct acpi_device_id usb_xhci_acpi_match[] = {
>         /* XHCI-compliant USB Controller */
> @@ -346,7 +386,7 @@ static int xhci_plat_resume(struct device *dev)
>         .remove = xhci_plat_remove,
>         .driver = {
>                 .name = "xhci-hcd",
> -               .pm = DEV_PM_OPS,
> +               .pm = &xhci_plat_pm_ops,
>                 .of_match_table = of_match_ptr(usb_xhci_of_match),
>                 .acpi_match_table = ACPI_PTR(usb_xhci_acpi_match),
>         },

Any comments?

-- 
Baolin.wang
Best Regards