Re: ov538-ov7690

[Michael Trimarchi <michael@panicking.kicks-ass.org>]

Hi,

Randy Dunlap wrote:
> On Tue, 10 Nov 2009 11:18:13 +0100 Michael Trimarchi wrote:
> 
>> Hi,
>>
>> Michael Trimarchi wrote:
>>> Hi all
>>>
>>> I'm working on the ov538 bridge with the ov7690 camera connected. 
>>> Somentimes I receive
>>>
>>> [ 1268.146705] gspca: ISOC data error: [110] len=1020, status=-71
>>> [ 1270.946739] gspca: ISOC data error: [114] len=1020, status=-71
>>> [ 1271.426689] gspca: ISOC data error: [82] len=1020, status=-71
>>> [ 1273.314640] gspca: ISOC data error: [1] len=1020, status=-71
>>> [ 1274.114661] gspca: ISOC data error: [17] len=1020, status=-71
>>> [ 1274.658718] gspca: ISOC data error: [125] len=1020, status=-71
>>> [ 1274.834666] gspca: ISOC data error: [21] len=1020, status=-71
>>> [ 1275.666684] gspca: ISOC data error: [94] len=1020, status=-71
>>> [ 1275.826645] gspca: ISOC data error: [40] len=1020, status=-71
>>> [ 1276.226721] gspca: ISOC data error: [100] len=1020, status=-71
>>>
>>> This error from the usb, how are they related to the camera?
> 
> -71 = -EPROTO (from include/asm-generic/errno.h).
> 
> -EPROTO in USB drivers means (from Documentation/usb/error-codes.txt):
> 
> -EPROTO (*, **)		a) bitstuff error
> 			b) no response packet received within the
> 			   prescribed bus turn-around time
> 			c) unknown USB error
> 
> footnotes:
> (*) Error codes like -EPROTO, -EILSEQ and -EOVERFLOW normally indicate
> hardware problems such as bad devices (including firmware) or cables.
> 

OK, but it's a failure of the ehci transaction on my laptop and seems that is
not so frequent. I think that can be a cable problem.

> (**) This is also one of several codes that different kinds of host
> controller use to indicate a transfer has failed because of device
> disconnect.  In the interval before the hub driver starts disconnect
> processing, devices may receive such fault reports for every request.
> 
> 
>> Ok, this is not a big issue because I can use vlc to test the camera. But anybody
>> knows why camorama, camstream, cheese crash during test. is it driver depend? or not?
> 
> Could be driver.  Easily could be a device problem too.

I think that it can be a vl2 vl1 problem. Because now I can manage in skype too using
the v4l1-compat library. Maybe my 2.6.32-rc5 is too new :(

Michael

> 
> ---
> ~Randy
>