[linux-dvb] Re: Transponder switching taking considerably longer

[Johannes Stezenbach <js@convergence.de>]

Oliver Endriss wrote:
> On Friday 25 July 2003 19:32, Johannes Stezenbach wrote:
> >
> > These were due to a bug in scan. Now everything works rock solid
> > with the fast I2C timings; the max. number of iterations in
> > i2c_busy_rise_and_fall() with udelay(20) is 4, so I don't see
> > what the udelay(500) could change (except make things slower).
> 
> Well, it addes 420us after each I2C transfer. Since there are more than 
> 10 I2C transfers per tuning attempt, the pll/frontend has much more 
> time to lock before the status gets checked.

Yes, but then i2c_busy_rise_and_fall() is the wrong place to put
the delay, it should be added to the frontend driver.

Johannes


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