linux-kernel - Re: [PATCH v4 3/3] usb: xhci: plat: Facilitate using autosuspend for xhci plat devices

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Message-ID: <d121952e-4662-4651-9398-3a5446a2281c@oss.qualcomm.com>
Date: Mon, 25 Aug 2025 11:10:26 +0530
From: Krishna Kurapati PSSNV <krishna.kurapati@....qualcomm.com>
To: Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Mathias Nyman <mathias.nyman@...el.com>
Cc: linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
        Bjorn Andersson <bjorn.andersson@....qualcomm.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: Re: [PATCH v4 3/3] usb: xhci: plat: Facilitate using autosuspend for
 xhci plat devices



On 8/12/2025 11:25 AM, Krishna Kurapati wrote:
> Allow autosuspend to be used by xhci plat device. For Qualcomm SoCs,
> when in host mode, it is intended that the controller goes to suspend
> state to save power and wait for interrupts from connected peripheral
> to wake it up. This is particularly used in cases where a HID or Audio
> device is connected. In such scenarios, the usb controller can enter
> auto suspend and resume action after getting interrupts from the
> connected device.
> 
> Signed-off-by: Krishna Kurapati <krishna.kurapati@....qualcomm.com>
> ---
>   drivers/usb/host/xhci-plat.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
> index 5eb51797de32..dd57ffedcaa2 100644
> --- a/drivers/usb/host/xhci-plat.c
> +++ b/drivers/usb/host/xhci-plat.c
> @@ -171,6 +171,7 @@ int xhci_plat_probe(struct platform_device *pdev, struct device *sysdev, const s
>   		return ret;
>   
>   	pm_runtime_set_active(&pdev->dev);
> +	pm_runtime_use_autosuspend(&pdev->dev);
>   	pm_runtime_enable(&pdev->dev);
>   	pm_runtime_get_noresume(&pdev->dev);
>   

Hi Mathias,

  Can you help provide your review on this patch.

Regards,
Krishna,