[linux-dvb] Re: Slow i2c problem

[Andrew de Quincey <adq_dvb@lidskialf.net>]

> But take a look what the i2c_busy_rise_and_fall() function does instead: It
> reads the PSR *once* and if the "I2C busy" bit is not set (which it never
> is upon the first read!) it does:
>
>   /* see if anything can be done while we're waiting */
>   SAA7146_RESCHED;
>   mdelay(1);
>
> Not surprising that the performance is poor...
>
> > Does anyone have any suggestions?
>
> Yes, rewrite the SAA7146A I2C functions from scratch :) Alternatively, try
> putting just an extra read of the PSR into the i2c_busy_rise_and_fall()
> function before the loops, that might work wonders already.

Is that from the released version of the driver on the website? I think the 
dvb-kernel CVS head version has had its i2c rewritten... but it still has the 
problem.



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