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

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Date:   Tue, 28 Dec 2021 09:26:28 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Puma Hsu <pumahsu@...gle.com>
Cc:     mathias.nyman@...el.com, albertccwang@...gle.com,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xhci: re-initialize the HC during resume if HCE was set

On Tue, Dec 28, 2021 at 02:02:46PM +0800, Puma Hsu wrote:
> When HCE(Host Controller Error) is set, it means an internal
> error condition has been detected. It needs to re-initialize
> the HC too.
> 
> Signed-off-by: Puma Hsu <pumahsu@...gle.com>
> ---
>  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..c546d9533410 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) || (temp & STS_HCE) || hibernated) {
>  
>  		if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) &&
>  				!(xhci_all_ports_seen_u0(xhci))) {
> -- 
> 2.34.1.448.ga2b2bfdf31-goog
> 

What commit does this fix?  Does it need to be backported to older
kernels as well?

thanks,

greg k-h