linux-kernel - Re: [PATCH] usb: pci-quirks: do not access OHCI

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Date:	Thu, 29 May 2014 19:45:47 +0400
From:	Nikita Yushchenko <nyushchenko@....rtsoft.ru>
To:	Alan Stern <stern@...land.harvard.edu>
CC:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Mathias Nyman <mathias.nyman@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	lugovskoy@....rtsoft.ru
Subject: Re: [PATCH] usb: pci-quirks: do not access OHCI_FMINTERVAL register
 on ULI hw

29.05.2014 19:44, Alan Stern пишет:
> On Thu, 29 May 2014, Nikita Yushchenko wrote:
> 
>> 29.05.2014 18:42, One Thousand Gnomes пишет:
>>>> I don't know how linux usb subsystem should behave against such
>>>> "half-existing" hardware. Perhaps hanging is not the best idea...
>>>> but maybe it should be fixed elsewhere, e.g. by masking non-wired
>>>> devices in platform PCI setup. Perhaps controlled by some device-tree
>>>> key.
>>>
>>> Does it have a unique svid/sdid set for the platform - if so you could
>>> just blacklist that combination of vid/did/svid/sdid.
>>
>> Unfortunately vid/did/svid/sdid come from ULI 1553 southbridge chip,
>> that is used by other hardware as well. AFAIK it is still being
>> manufactured, and could appear in PCs or laptops.
> 
>>> It would help to print the value of fminterval.
>>> And here to print the value obtained by the readl().
>>
>> I've checked these... all values read as 0xffffffff - which does not
>> look correct
> 
> You could have the platform setup code read one of those hardware
> registers, such as FMINTERVAL.  If it obtains 0xffffffff, don't
> register the OHCI controller as a platform device.

It is not a platform_device, it is PCI device that is found via bus scan.

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