Re: [M560x-driver-devel] register value change when it was read po1030 sensor

[Erik A. <eri...@gm...>]

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Lukáš Karas wrote:
> Dne Monday 05 of January 2009 14:52:46 Laurent BARRAILLE napsal(a):
>> Hi,
>>
>> When i launch vlc and i close it many times in a row and quickly, my
>> webcam's image becomes one time too blue, one time upside down and too
>> red ...
>>
>> With the v4lctrl software, i obtain the same result when i read a or
>> many register value every second (for example : watch -n 0,5 v4lctrl -g
>> 9963791)
>>
>> Where ist the problem, in driver, in libv4l ?
>> Is it the same thing with other sensor (I have the po1030 sensor) ?
>>
>>
>> I have the last version of the driver (from linuxtv.org)
>>
>> Regards
>>
>> Laurent BARRAILLE
>>
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> 
> 
> Hi Laurent.
> 
> I have same problem with my sensor (s5k83a). I mean that is problem in 
> sensor_read / sensor_write function, because sensor_read return bad value 
> many times (different from writed value).
> 
> Erik work on ctrl cache for all sensors now. It could help with this 
> problem... I will test his patch for my sensor today evening.
> 
> Regards, Lukas.

Hi,
I'm currently implementing ctrl cache on all the sensors but have
only gotten around to a couple. I'll try to fix the po1030 tomorrow.

It's bad if we can't trust the values we read from the sensor as it
implies we're doing it wrong. This calls for some closer inspection
of the read sensor routine.

Regards,
Erik
> 
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