[linux-dvb] System load caused by I2C (was: Re: Re: Announcement:new saa7146 driver core for the av7110 dvb driver)

[Michael Hunold <hunold-ml@web.de>]

Hello Johannes,

>>>My xawtv is a binary package from Debian unstable. Must I recompile with
>>>the new videodev.h for grabdisplay to work?
>>
>>No. "xawtv" comes with it's own set of videodev.h, videodev2.h (old - 
>>pre-2.5.x-version) and videodev2.h (2.5.x version) header files and has 
>>modules for all three apis out there. So it should work.

I can confirm your problem with xawtv-3.81, I'll have a look at it tomorrow.

> One other thing I noticed: The new I2C driver causes a higher system
> load, most visible when you pull out the SAT cable and let the kdvb-fe
> thread do its zig-zag scanning work. In theory the approach with
> schedule() should perform better than the old mdelay() stuff,
> but it seems it doesn't. Maybe not enough to worry about, but maybe
> we could use one of the saa's register sequencers for I2C timing?

Yes, heavy i2c access can cause high system load, that's true.

In my current design, RPS0 is used for video capture, RPS1 is used for 
vbi capture.

If you can tell me for sure, that you never ever want to capture vbi (is 
it re-inserted at all?) with a dvb card, then I can add a "use RPS1 for 
DVB I2C access" mode.

> Regards,
> Johannes

CU
Michael.




-- 
Info:
To unsubscribe send a mail to listar@linuxtv.org with "unsubscribe linux-dvb" as subject.