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

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Message-ID: <6a43e6aa-5609-ecd5-b040-010763a686ee@zhaoxin.com>
Date:   Fri, 21 Apr 2023 01:14:46 +0800
From:   "WeitaoWang-oc@...oxin.com" <WeitaoWang-oc@...oxin.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     <stern@...land.harvard.edu>, <linux-usb@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <tonywwang@...oxin.com>,
        <weitaowang@...oxin.com>
Subject: Re: [PATCH] UHCI：adjust zhaoxin UHCI controllers OverCurrent bit value

On 2023/4/20 16:05, Greg KH wrote:
> On Thu, Apr 20, 2023 at 07:14:45PM +0800, Weitao Wang wrote:
>> Over Current condition is not standardized in the UHCI spec.
>> Zhaoxin UHCI controllers report OverCurrent bit active off.
>> Intel controllers report it active on, so we'll adjust the bit value.
>>
>> Signed-off-by: Weitao Wang <WeitaoWang-oc@...oxin.com>
> 
> Note, your Subject: line has odd characters in it, can you rewrite it to
> just use ascii?  I think it's the '：' character which should be ':',
> right?Yes,you are right. it's my typo mistake. I'll rewrite this patch. Thanks!

>> ---
>>   drivers/usb/host/uhci-pci.c | 4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/drivers/usb/host/uhci-pci.c b/drivers/usb/host/uhci-pci.c
>> index 3592f757fe05..177e3c2aa287 100644
>> --- a/drivers/usb/host/uhci-pci.c
>> +++ b/drivers/usb/host/uhci-pci.c
>> @@ -126,6 +126,10 @@ static int uhci_pci_init(struct usb_hcd *hcd)
>>   	if (to_pci_dev(uhci_dev(uhci))->vendor == PCI_VENDOR_ID_VIA)
>>   		uhci->oc_low = 1;
>>   
>> +	/* ZHAOXIN controllers report OverCurrent bit active off. */
>> +	if (to_pci_dev(uhci_dev(uhci))->vendor == PCI_VENDOR_ID_ZHAOXIN)
>> +		uhci->oc_low = 1;
>> +
> 
> This should also go to the stable kernels, right?
> 
> But a new UHCI controller?  And this affects all of them? 
All UHCI controller of zhaoxin have this issue, And Hope this
patch go to stable kernel.Could I resubmit this patch with
modify subject typo mistake?

> Intel an issue here (as you mention in the changelog text)?
> 
I got this info from uhci driver comments in function uhci_pci_init.

"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.)"

Best Regards,
weitao

> thanks,
> 
> greg k-h
> .