[linux-dvb] Re: timing in dvb-kernel

[Jeremy Hall <jhall@maoz.com>]

It still feels like it takes longer to tune in dvb-kernel than it did in 
DVB.

_J

In the new year, Oliver Endriss wrote:
> On Tuesday 25 November 2003 10:19, Michael Hunold wrote:
> > > Note that without [2] modification [1] is almost useless,
> > > because each I2C access causes a delay of 10..20ms.
> > > I suggested several times to improve this but I was ignored...
> > 
> > I'm sorry if I ignored something back then. I just had a look at our 
> > discussion and it thought that the discussion was about the DVB driver only.
> > 
> > Please repeat your proposal.
> 
> Basically I suggested to add a function to make 'short_delay'
> configurable, because dvb-kernel did not tune as fast as DVB.
> (IIRC these discussions were on the dvb and vdr ml a few months ago.)
> 
> > In your other mail your wrote:
> > 
> >  > The problem is that the saa7146 driver is used by different types of
> >  > cards. IMHO we need a way to select whether short_delay should be used
> >  > in the saa7146 driver or not.
> > 
> > "struct saa7146_extension" in "include/media/saa7146.h" already has a 
> > flag SAA7146_USE_I2C_IRQ for i2c driven i2c for analog tv cards.
> > 
> > You could simply add a SAA7146_I2C_SHORT_DELAY flag here and check for 
> > it saa7146_i2c_writeout() like this:
> > 
> > if( 0 != (SAA7146_I2C_SHORT_DELAY & dev->ext->flags)) {
> > 	short_delay = 1;
> > }
> 
> That's fine. If you don't mind I'll add this.
> 
> Oliver
> 
> 
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