linux-kernel - Re: [PATCH v5 1/2] usb: host: plat: Enable xhci plat runtime PM

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Date:   Wed, 25 Jan 2017 12:30:18 -0500
From:   Robert Foss <robert.foss@...labora.com>
To:     Baolin Wang <baolin.wang@...aro.org>, mathias.nyman@...el.com,
        balbi@...nel.org
Cc:     gregkh@...uxfoundation.org, broonie@...nel.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 1/2] usb: host: plat: Enable xhci plat runtime PM

Looks good to me.

Feel free to add my r-b.

On 2016-12-13 02:49 AM, Baolin Wang 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 v4:
>  - No updates.
>
> 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),
>  	},
>