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

[Oliver Endriss <o.endriss@gmx.de>]

On Friday 25 July 2003 18:10, Klaus Schmidinger wrote:
> Oliver Endriss wrote:
> > Hm, could you try to increase the speed again but set the delay to
> > 500us or 1000us. I'd like to know whether it is a matter of bus
> > speed or a timing issue. I think that timing problems should be
> > fixed in the frontend driver. If nothing else helps we have to
> > revert my change.
>
> I changed saa7146_core.c back to SAA7146_I2C_BUS_BIT_RATE_120 and
> left saa7146.c at udelay(500) (as in the previous test).
>
> Switching transponders still appears to be fast, so I'd say it makes
> no difference whether I use SAA7146_I2C_BUS_BIT_RATE_120 or
> SAA7146_I2C_BUS_BIT_RATE_3200, as long as I have udelay(500) in
> saa7146.c.

So it appears to be a timing issue in the frontend driver.
Which frontend is detected by the driver? We should try to fix this. 
Obviously there are some timing constraints which we are not aware of. 
:-(


Oliver


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