Re: [PATCH] b43: Fix Bluetooth coexistence SPROM coding error for Motorola 7010 variant of BCM4306

[Dan Williams <dcbw@redhat.com>]

On Sat, 2008-09-20 at 23:11 +0200, Johannes Berg wrote:
> On Sat, 2008-09-20 at 14:05 -0700, Luis R. Rodriguez wrote:
> 
> > >> > Does anyone actually make laptops that use these bluetooth coexistence
> > >> > pins? All CSR bluetooth chips do it automatically I'm told, maybe we
> > >> > should just kill them completely.
> > >>
> > >> Regardless of the wireless card? Or just for bcm?
> > >
> > > Well just for b43(legacy), but out of curiosity, does any BT chip use
> > > these pins anyway? Well I guess _somebody_ has to buy BCMs BT chips,
> > > but ...
> > 
> > BCM BT chips? I thought you said CSR?
> 
> Well the thing is, BCM wifi chips have these IO pins that tell the BT
> chip what the wifi chip is doing. But CSR chips for instance don't care,
> they just check what the wifi chip is doing on the antenna. So those
> don't use those IO pins.

Marvell SD 8686 have these pins too; I have at least one sample of such
a setup.  Not that I have had time yet to implement it...  but this sort
of thing exists of course.

Dan

> Hence, I'm wondering if there's any use in the IO pins at all. But they
> must have added them for a reason, presumably because their own BT chips
> can use those inputs...
> 
> Anyway, mostly just idly wondering, since most of the time it works fine
> and the EEPROM is actually done right I guess we should keep them on.
> 
> johannes