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

[Klaus Schmidinger <Klaus.Schmidinger@cadsoft.de>]

Oliver Endriss wrote:
> 
> On Friday 25 July 2003 16:44, Klaus Schmidinger wrote:
> > Oliver Endriss wrote:
> > > ...I recently changed I2C bus speed from 10.3kHz to 275kHz to speed
> > > up tuning and I2C firmware downloads. At least it does for me. ;-)
> > >
> > > Maybe this causes problems with some frontends if they need some
> > > delays between tuning and status check. Or they cannot handle the
> > > high speed reliably...
> > >
> > > Try to change
> > >     SAA7146_I2C_BUS_BIT_RATE_120
> > > back to
> > >     SAA7146_I2C_BUS_BIT_RATE_3200
> > > in saa7146_core.c. Does it make a difference?
> >
> > This results in
> >
> > Jul 25 16:41:44 video kernel: DVB: AV7111(0) - firm f0240009, rtsl
> > b0250018, vid 71010068, app 8000261a Jul 25 16:41:44 video kernel:
> > DVB: AV7111(0) - firmware supports CI link layer interface Jul 25
> > 16:41:45 video kernel: av7110(0): adac type set to 0
> > Jul 25 16:41:45 video kernel: Couldn't read from EEPROM: not there?
> > ...
> > and the screen stays black (the OSD works, though).
> 
> Argh, I think you have to increase the udelay(20) in saa7146.c line 1286
> for the lower speed. Try something like udelay(500).

With this change (in addition to the one you suggested first) it works
as fast as before (at least as far as I can tell, but the difference was
pretty obvious).

Klaus


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