linux-kernel - Re: [PATCH v4] xhci: re-initialize the HC during resume if HCE was set

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Message-ID: <f6d19871-a9d0-85a8-d834-f8f8198cbe15@linux.intel.com>
Date:   Mon, 17 Jan 2022 14:24:54 +0200
From:   Mathias Nyman <mathias.nyman@...ux.intel.com>
To:     Puma Hsu <pumahsu@...gle.com>, mathias.nyman@...el.com,
        gregkh@...uxfoundation.org
Cc:     s.shtylyov@....ru, albertccwang@...gle.com,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH v4] xhci: re-initialize the HC during resume if HCE was
 set

On 17.1.2022 7.39, Puma Hsu wrote:
> When HCE(Host Controller Error) is set, it means an internal
> error condition has been detected. Software needs to re-initialize
> the HC, so add this check in xhci resume.
> 
> Cc: stable@...r.kernel.org
> Signed-off-by: Puma Hsu <pumahsu@...gle.com>
> ---
> v2: Follow Sergey Shtylyov <s.shtylyov@....ru>'s comment.
> v3: Add stable@...r.kernel.org for stable release.
> v4: Refine the commit message.
> 
>  drivers/usb/host/xhci.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> index dc357cabb265..ab440ce8420f 100644
> --- a/drivers/usb/host/xhci.c
> +++ b/drivers/usb/host/xhci.c
> @@ -1146,8 +1146,8 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
>  		temp = readl(&xhci->op_regs->status);
>  	}
>  
> -	/* If restore operation fails, re-initialize the HC during resume */
> -	if ((temp & STS_SRE) || hibernated) {
> +	/* If restore operation fails or HC error is detected, re-initialize the HC during resume */
> +	if ((temp & (STS_SRE | STS_HCE)) || hibernated) {

Add a debug message in case we reset due to HCE

-Mathias