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@rowland.harvard.edu>
Cc: stable@vger.kernel.org
Signed-off-by: Weitao Wang <WeitaoWang-oc@zhaoxin.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. */
-- 
2.32.0

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@rowland.harvard.edu>
> Cc: stable@vger.kernel.org
> Signed-off-by: Weitao Wang <WeitaoWang-oc@zhaoxin.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@rowland.harvard.edu>