linux-kernel - Re: [PATCH v3] usb: host: xhci-plat: Set XHCI_SKIP_PHY

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Date:   Wed, 1 Dec 2021 19:17:00 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     Doug Anderson <dianders@...omium.org>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Matthias Kaehlcke <mka@...omium.org>,
        Sandeep Maheswaram <quic_c_sanm@...cinc.com>
Cc:     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 v3] usb: host: xhci-plat: Set XHCI_SKIP_PHY_INIT quirk for
 DWC3 controller

Quoting Sandeep Maheswaram (2021-11-30 22:15:38)
> 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 core and HCD core.
> DWC3 manages phy in their core drivers.

This looks wrapped weirdly.

> Set this quirk to avoid phy initialization in HCD core.
>
> Signed-off-by: Sandeep Maheswaram <quic_c_sanm@...cinc.com>

Any Fixes tag?

> ---
>  drivers/usb/host/xhci-plat.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
> index c1edcc9..9bbd939 100644
> --- a/drivers/usb/host/xhci-plat.c
> +++ b/drivers/usb/host/xhci-plat.c
> @@ -327,6 +327,9 @@ static int xhci_plat_probe(struct platform_device *pdev)
>                                          &xhci->imod_interval);
>         }
>
> +       if (of_device_is_compatible(pdev->dev.parent->of_node, "snps,dwc3"))

Are we sure that pdev->dev.parent isn't NULL here?

> +               xhci->quirks |= XHCI_SKIP_PHY_INIT;
> +
>         hcd->usb_phy = devm_usb_get_phy_by_phandle(sysdev, "usb-phy", 0);
>         if (IS_ERR(hcd->usb_phy)) {