linux-kernel - Re: [PATCH v4 1/2] usb: host: plat: Enable xhci plat runtime PM

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Date:   Thu, 8 Dec 2016 15:04:57 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     mathias.nyman@...el.com, Felipe Balbi <balbi@...nel.org>
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 v4 1/2] usb: host: plat: Enable xhci plat runtime PM

Hi Mathias and Felipe,

On 28 November 2016 at 14:43, Baolin Wang <baolin.wang@...aro.org> wrote:
> Enable the xhci plat runtime PM for parent device to suspend/resume xhci.
> Also call pm_runtime_get_noresume() in probe() function in case the parent
> device doesn't call suspend/resume callback by runtime PM now.
>
> Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
> ---
> Changes since v3:
>  - Fix kbuild error.
>
> Changes since v2:
>  - Add pm_runtime_get_noresume() in probe() function.
>  - Add pm_runtime_set_suspended()/pm_runtime_put_noidle() in remove() function.
>
> Changes since v1:
>  - No updates.
> ---
>  drivers/usb/host/xhci-plat.c |   41 ++++++++++++++++++++++++++++++++++++-----
>  1 file changed, 36 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
> index ed56bf9..5805c6a 100644
> --- a/drivers/usb/host/xhci-plat.c
> +++ b/drivers/usb/host/xhci-plat.c
> @@ -246,6 +246,10 @@ static int xhci_plat_probe(struct platform_device *pdev)
>         if (ret)
>                 goto dealloc_usb2_hcd;
>
> +       pm_runtime_get_noresume(&pdev->dev);
> +       pm_runtime_set_active(&pdev->dev);
> +       pm_runtime_enable(&pdev->dev);
> +
>         return 0;
>
>
> @@ -274,6 +278,10 @@ static int xhci_plat_remove(struct platform_device *dev)
>         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
>         struct clk *clk = xhci->clk;
>
> +       pm_runtime_set_suspended(&dev->dev);
> +       pm_runtime_put_noidle(&dev->dev);
> +       pm_runtime_disable(&dev->dev);
> +
>         usb_remove_hcd(xhci->shared_hcd);
>         usb_phy_shutdown(hcd->usb_phy);
>
> @@ -311,14 +319,37 @@ 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);
> +}
> +
> +static int xhci_plat_runtime_idle(struct device *dev)
> +{
> +       return 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,
> +                          xhci_plat_runtime_idle)
>  };
> -#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 */
> @@ -332,7 +363,7 @@ 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),
>         },
> --
> 1.7.9.5
>

Do you have any comments about this patch? Thanks.

-- 
Baolin.wang
Best Regards