linux-kernel - Re: [PATCH v2 1/1] usb: cdns3: host: fix endless superspeed hub port reset

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Date:   Thu, 27 Oct 2022 09:06:22 +0200
From:   Alexander Stein <alexander.stein@...tq-group.com>
To:     Frank Li <Frank.Li@....com>
Cc:     jun.li@....com, frank.li@....com, a-govindraju@...com,
        gregkh@...uxfoundation.org, hzpeterchen@...il.com,
        imx@...ts.linux.dev, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, pawell@...ence.com,
        peter.chen@...nel.org, rogerq@...nel.org, stable@...nel.org
Subject: Re: [PATCH v2 1/1] usb: cdns3: host: fix endless superspeed hub port reset

Am Mittwoch, 26. Oktober 2022, 21:07:49 CEST schrieb Frank Li:
> 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/po
> wer/runtime_status
> 
>  suspended
> 
>  cat
> /sys/bus/platform/devices/5b110000.usb/5b130000.usb/xhci-hcd.1.auto/usb1/po
> wer/runtime_status
> 
>  active
> 
>  cat
> /sys/bus/platform/devices/5b110000.usb/5b130000.usb/xhci-hcd.1.auto/power/r
> untime_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. Reinit again in resume function in case
> controller power lost during suspend.
> 
> Cc: stable@...r.kernel.org 5.10
> Signed-off-by: Li Jun <jun.li@....com>
> Signed-off-by: Frank Li <Frank.Li@....com>
> ---
> 
> Change from V1 to V2.
>  - call xhci_cdns3_plat_start() in xhci_cdns3_resume_quirk
> in case power lost during suspend
> 
>  drivers/usb/cdns3/host.c | 56 ++++++++++++++++++++--------------------
>  1 file changed, 28 insertions(+), 28 deletions(-)
> 
> diff --git a/drivers/usb/cdns3/host.c b/drivers/usb/cdns3/host.c
> index 9643b905e2d8..6164fc4c96a4 100644
> --- a/drivers/usb/cdns3/host.c
> +++ b/drivers/usb/cdns3/host.c
> @@ -24,11 +24,37 @@
>  #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_resume_quirk(struct usb_hcd *hcd)
> +{
> +	xhci_cdns3_plat_start(hcd);
> +	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,
> +	.resume_quirk = xhci_cdns3_resume_quirk,
>  };
> 
>  static int __cdns_host_init(struct cdns *cdns)
> @@ -90,32 +116,6 @@ 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);

Although I could only test it on v5.15 downstream kernel
Acked-by: Alexander Stein <alexander.stein@...tq-group.com>