linux-kernel - Re: [PATCH v3] UHCI:adjust zhaoxin UHCI controllers OverCurrent bit value

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Message-ID: <75fa0424-d0e5-4d7d-a553-55f11218f960@rowland.harvard.edu>
Date:   Sun, 23 Apr 2023 14:14:38 -0400
From:   Alan Stern <stern@...land.harvard.edu>
To:     Weitao Wang <WeitaoWang-oc@...oxin.com>
Cc:     gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, tonywwang@...oxin.com,
        weitaowang@...oxin.com, stable@...r.kernel.org
Subject: Re: [PATCH v3] UHCI:adjust zhaoxin UHCI controllers OverCurrent bit
 value

On Sun, Apr 23, 2023 at 06:59:52PM +0800, Weitao Wang wrote:
> OverCurrent condition is not standardized in the UHCI spec.
> Zhaoxin UHCI controllers report OverCurrent bit active off.
> In order to handle OverCurrent condition correctly, the uhci-hcd
> driver needs to be told to expect the active-off behavior.
> 
> Suggested-by: Alan Stern <stern@...land.harvard.edu>
> Cc: stable@...r.kernel.org
> Signed-off-by: Weitao Wang <WeitaoWang-oc@...oxin.com>
> ---
> v2->v3
>  - Change patch code style.
> 
>  drivers/usb/host/uhci-pci.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/usb/host/uhci-pci.c b/drivers/usb/host/uhci-pci.c
> index 3592f757fe05..7bd2fddde770 100644
> --- a/drivers/usb/host/uhci-pci.c
> +++ b/drivers/usb/host/uhci-pci.c
> @@ -119,11 +119,13 @@ static int uhci_pci_init(struct usb_hcd *hcd)
>  
>  	uhci->rh_numports = uhci_count_ports(hcd);
>  
> -	/* Intel controllers report the OverCurrent bit active on.
> -	 * VIA controllers report it active off, so we'll adjust the
> -	 * bit value.  (It's not standardized in the UHCI spec.)
> +	/*
> +	 * Intel controllers report the OverCurrent bit active on.  VIA
> +	 * and ZHAOXIN controllers report it active off, so we'll adjust
> +	 * the bit value.  (It's not standardized in the UHCI spec.)
>  	 */
> -	if (to_pci_dev(uhci_dev(uhci))->vendor == PCI_VENDOR_ID_VIA)
> +	if (to_pci_dev(uhci_dev(uhci))->vendor == PCI_VENDOR_ID_VIA ||
> +			to_pci_dev(uhci_dev(uhci))->vendor == PCI_VENDOR_ID_ZHAOXIN)
>  		uhci->oc_low = 1;
>  
>  	/* HP's server management chip requires a longer port reset delay. */

Acked-by: Alan Stern <stern@...land.harvard.edu>