linux-kernel - Re: [PATCH 1/1] usb: cdns3: host: fix endless superspeed hub port reset

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Date:   Fri, 21 Oct 2022 09:51:46 +0800
From:   Peter Chen <hzpeterchen@...il.com>
To:     Frank Li <Frank.Li@....com>
Cc:     imx@...ts.linux.dev, Pawel Laszczak <pawell@...ence.com>,
        Peter Chen <peter.chen@...nel.org>,
        Roger Quadros <rogerq@...nel.org>,
        Aswath Govindraju <a-govindraju@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "open list:CADENCE USBSSP DRD IP DRIVER" <linux-usb@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>, stable@...nel.org
Subject: Re: [PATCH 1/1] usb: cdns3: host: fix endless superspeed hub port reset

On Wed, Oct 19, 2022 at 11:21 PM Frank Li <Frank.Li@....com> wrote:
>
> From: Li Jun <jun.li@....com>
>
> When usb 3.0 hub connect with one USB 2.0 device and NO USB 3.0 device,
> some usb hub reports endless port reset message.
>
> [  190.324169] usb 2-1: new SuperSpeed USB device number 88 using xhci-hcd
> [  190.352834] hub 2-1:1.0: USB hub found
> [  190.356995] hub 2-1:1.0: 4 ports detected
> [  190.700056] usb 2-1: USB disconnect, device number 88
> [  192.472139] usb 2-1: new SuperSpeed USB device number 89 using xhci-hcd
> [  192.500820] hub 2-1:1.0: USB hub found
> [  192.504977] hub 2-1:1.0: 4 ports detected
> [  192.852066] usb 2-1: USB disconnect, device number 89
>
> The reason is the runtime pm state of USB2.0 port is active and
> USB 3.0 port is suspend, so parent device is active state.
>
>  cat /sys/bus/platform/devices/5b110000.usb/5b130000.usb/xhci-hcd.1.auto/usb2/power/runtime_status
>
>  suspended
>
>  cat /sys/bus/platform/devices/5b110000.usb/5b130000.usb/xhci-hcd.1.auto/usb1/power/runtime_status
>
>  active
>
>  cat /sys/bus/platform/devices/5b110000.usb/5b130000.usb/xhci-hcd.1.auto/power/runtime_status
>
>  active
>
>  cat /sys/bus/platform/devices/5b110000.usb/5b130000.usb/power/runtime_status
>
>  active
>
> So xhci_cdns3_suspend_quirk() have not called. U3 configure is not applied.
>
> move U3 configure into host start
>
> Signed-off-by: Li Jun <jun.li@....com>
> Signed-off-by: Frank Li <Frank.Li@....com>
> ---
>  drivers/usb/cdns3/host.c | 58 +++++++++++++++++++++-------------------
>  1 file changed, 31 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/usb/cdns3/host.c b/drivers/usb/cdns3/host.c
> index 9643b905e2d8..9092b6f4d7c4 100644
> --- a/drivers/usb/cdns3/host.c
> +++ b/drivers/usb/cdns3/host.c
> @@ -24,11 +24,41 @@
>  #define CFG_RXDET_P3_EN                BIT(15)
>  #define LPM_2_STB_SWITCH_EN    BIT(25)
>
> -static int xhci_cdns3_suspend_quirk(struct usb_hcd *hcd);
> +static void xhci_cdns3_plat_start(struct usb_hcd *hcd)
> +{
> +       struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> +       u32 value;
> +
> +       /* set usbcmd.EU3S */
> +       value = readl(&xhci->op_regs->command);
> +       value |= CMD_PM_INDEX;
> +       writel(value, &xhci->op_regs->command);
> +
> +       if (hcd->regs) {
> +               value = readl(hcd->regs + XECP_AUX_CTRL_REG1);
> +               value |= CFG_RXDET_P3_EN;
> +               writel(value, hcd->regs + XECP_AUX_CTRL_REG1);
> +
> +               value = readl(hcd->regs + XECP_PORT_CAP_REG);
> +               value |= LPM_2_STB_SWITCH_EN;
> +               writel(value, hcd->regs + XECP_PORT_CAP_REG);
> +       }
> +}
> +
> +static int xhci_cdns3_suspend_quirk(struct usb_hcd *hcd)
> +{
> +       if (pm_runtime_status_suspended(hcd->self.controller))
> +               return 0;
> +
> +       xhci_cdns3_plat_start(hcd);
> +

Why does it need to call again at suspend?

Peter

> +       return 0;
> +}
>
>  static const struct xhci_plat_priv xhci_plat_cdns3_xhci = {
>         .quirks = XHCI_SKIP_PHY_INIT | XHCI_AVOID_BEI,
>         .suspend_quirk = xhci_cdns3_suspend_quirk,
> +       .plat_start = xhci_cdns3_plat_start,
>  };
>
>  static int __cdns_host_init(struct cdns *cdns)
> @@ -90,32 +120,6 @@ static int __cdns_host_init(struct cdns *cdns)
>         return ret;
>  }
>
> -static int xhci_cdns3_suspend_quirk(struct usb_hcd *hcd)
> -{
> -       struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> -       u32 value;
> -
> -       if (pm_runtime_status_suspended(hcd->self.controller))
> -               return 0;
> -
> -       /* set usbcmd.EU3S */
> -       value = readl(&xhci->op_regs->command);
> -       value |= CMD_PM_INDEX;
> -       writel(value, &xhci->op_regs->command);
> -
> -       if (hcd->regs) {
> -               value = readl(hcd->regs + XECP_AUX_CTRL_REG1);
> -               value |= CFG_RXDET_P3_EN;
> -               writel(value, hcd->regs + XECP_AUX_CTRL_REG1);
> -
> -               value = readl(hcd->regs + XECP_PORT_CAP_REG);
> -               value |= LPM_2_STB_SWITCH_EN;
> -               writel(value, hcd->regs + XECP_PORT_CAP_REG);
> -       }
> -
> -       return 0;
> -}
> -
>  static void cdns_host_exit(struct cdns *cdns)
>  {
>         kfree(cdns->xhci_plat_data);
> --
> 2.34.1
>