[linux-dvb] Re: Slow i2c problem -- temporary patch

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

On Monday 16 June 2003 11:25, Michael Hunold wrote:
> Hello Andrew,
>
> > 1) Is there a reason for the i2c bitrate to be set to 10kHz right now?
> > Perhaps some cards have very slow i2c components? It is fine on the
> > tda10045h-based cards
>
> My analog cards have rather slow i2c components, but 10kHz is really the
> lower bound. I never bother to change it, because only a couple of bytes
> are send on these cards.
>
> > 2) I've changed the wait-for-status-delay to use mdelay()... which is not
> > ideal as we are now effectively busy waiting, but the current 1 jiffy
> > delay is WAY too much at the new speed. At 275kHz, it doesn't  delay for
> > long enough for this to be significant though.
>
> If Robert's code works reliable, we should go for that and don't wait at
> all and use a higher transmission rate.

Unfortunately, it causes other problems in linux... see my latest i2c patch 
just submitted.



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