libertas_sdio doesn't work after reloading

[Dan Williams]

On Tue, 2009-02-03 at 11:09 -0800, Matt Reimer wrote:
> On Tue, Feb 3, 2009 at 7:42 AM, Dan Williams <dcbw at redhat.com> wrote:
> > On Tue, 2009-02-03 at 11:20 +0000, Jonathan Cameron wrote:
> >> Matt Reimer wrote:
> >> > On Mon, Feb 2, 2009 at 1:58 PM, Andrey Yurovsky <andrey at cozybit.com> wrote:
> >> >> Hi Matt.  Is this on an embedded system or on a desktop PC with some
> >> >> host controller?  If so, which one?  I'm curious because module reload
> >> >> seems to work fine with my Ricoh host controller.
> >> >
> >> > This is on an embedded system, using the SD controller on a pxa320.
> >> >
> >> > Matt
> >> >
> >> I ran into exactly the same issue with a pxa271 board, but never figured
> >> out what was going on.  Very interested to hear if you do!
> >
> > The only method I have found to reset the libertas chip is to pull the
> > power from the card or unplug it.  There hasn't been any other method
> > that we can figure out to hard-reset the card, either with SDIO commands
> > or with CMD_802_11_RESET.  I'd be quite interested if anyone found a
> > mechanism for doing a full reset while the card's plugged in.
> 
> Do you think the problem could be that after reset the libertas chip
> is talking to the controller at the wrong bus speed and bus width?

It could well be.  Pierre, I and Philip Rakity are having a side
conversation right now about this sort of thing.  Let me see if Philip
would mind if I pasted in his debugging patch for that.  Basically,
issue an SDIO ABORT/reset during MMC bus rescan.  That could kick the
card hard enough for it to be re-enumerated and take firmware upload
again.

Dan