Re: [v4l-dvb-maintainer] bttv driver questions

[Trent Piepho <xyzzy@xxxxxxxxxxxxx>]

On Tue, 26 Aug 2008, Andy Walls wrote:
> On Tue, 2008-08-26 at 19:20 -0700, Trent Piepho wrote:
> > On Wed, 27 Aug 2008, Daniel [iso-8859-1] Glckner wrote:
>
> > Isn't the latency timer in units of 250 ns, not PCI cycles?
>
> Latency timer is in PCI clock cycles.  Most devices ignore the 3 least
> significant bits of the setting (as allowed/suggested by the PCI spec),
> making most latency timers as multiple of 8 PCI clock cycles.

I bet I was reading a datasheet for a device that did this.  They probably
dropped three bits from the field width and said it was 250 ns units.

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