[linux-dvb] Re: dish networks legacy cmd

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

On Thursday 07 Oct 2004 13:40, NooneImportant wrote:
> On Thu, 7 Oct 2004 10:29:35 +0100, Andrew de Quincey wrote:
> > Hi, I found this when I was messing with the stv0299. All it appears to
> > be doing is twiddling the voltage between 13v/18v depending on the binary
> > sequence in a supplied u32... e.g. 10110 == 18v,13v,18v,18v,13v and so
> > on.
> >
> > I don't see why this is implemented in stv0299 - its not needing any
> > hardware-specific features. I would have thought implementing it directly
> > in dvb_frontend.c/dvb_frontend_ioctl() would be better. Then we dont add
> > any more code to stv0299, and it can be used with any DVB-S frontend.
>
> Actually this patch, which is needed for budget cards might explain why.
> Basically, the switch is very sensitive to getting the transitions on
> time, and doing a set_voltage can take more than 8ms on those cards,
> so I need to actually break the commands down.  Even then just  doing
> a writereg can take over 1ms, so I need to measure the delays and
> account for them during the sleep.
>
> It also adds a switch to print the delay, which helps with debuging.

Ah I see - OK, I'll pull that into the refactored code.