linux-kernel - Re: [PATCH v5] usb: host: xhci-plat: Set XHCI_SKIP_PHY

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Date:   Thu, 6 Jan 2022 15:25:59 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Sandeep Maheswaram <quic_c_sanm@...cinc.com>
Cc:     Felipe Balbi <balbi@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Doug Anderson <dianders@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, quic_pkondeti@...cinc.com,
        quic_ppratap@...cinc.com
Subject: Re: [PATCH v5] usb: host: xhci-plat: Set XHCI_SKIP_PHY_INIT quirk
 for DWC3 controller

On Wed, Dec 22, 2021 at 11:39:43AM +0530, Sandeep Maheswaram wrote:
> Set XHCI_SKIP_PHY_INIT quirk to avoid phy initialization twice.
> Runtime suspend of phy drivers was failing from DWC3 driver as runtime
> usage value is 2 because the phy is initialized from DWC3 and HCD core.
> DWC3 manages phy in their core drivers. Set this quirk to avoid phy
> initialization in HCD core.
> 
> Signed-off-by: Sandeep Maheswaram <quic_c_sanm@...cinc.com>
> ---
> v5:
> Added comment to explain the change done.
> v4:
> Changed pdev->dev.parent->of_node to sysdev->of_node
> 
>  drivers/usb/host/xhci-plat.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
> index c1edcc9..e6014d4 100644
> --- a/drivers/usb/host/xhci-plat.c
> +++ b/drivers/usb/host/xhci-plat.c
> @@ -327,6 +327,14 @@ static int xhci_plat_probe(struct platform_device *pdev)
>  					 &xhci->imod_interval);
>  	}
>  
> +	/*
> +	 * Set XHCI_SKIP_PHY_INIT quirk to avoid phy initialization twice.
> +	 * DWC3 manages phy in their core drivers. Set this quirk to avoid phy
> +	 * initialization in HCD core.
> +	 */
> +	if (of_device_is_compatible(sysdev->of_node, "snps,dwc3"))
> +		xhci->quirks |= XHCI_SKIP_PHY_INIT;
> +

Why is this function caring about dwc3 stuff?  Shoudn't this be a
"generic" device property instead of this device-specific one?

thanks,

greg k-h