Re: Git tree updated to v2.6.27, some issues remain

[David Brownell <david-b@pacbell.net>]

On Thursday 16 October 2008, Koen Kooi wrote:
> > The MUSB transceiver-level issues I was aware of (mostly
> > on Overo, but minor glitches on Beagle) now seem to be
> > fixed by the combination of the IRQ patches I sent last
> > week, plus the twl4030-usb patch I just sent.
> 
> Does your patch also make OTG cable detect work?

I'm not entirely sure what you mean by that ...

For an OTG connector there are four states of note:

 (1) Nothing connected
 (2) There's a B-connector
	(2a) with nothing on the other end, same as (1)
	(2b) with a host on the other end, suppling VBUS
 (3) There's an A-connector, grounding the ID pin
	(3a) with nothing on the other end,
	(3b) with a periphereral pulling up D+ or D-

That patch uses the STS_HW_CONDITIONS register to detect
those three basic states ...

Now, whether the musb_hdrc code handles both (3a) and (3b)
correctly is another issue.  Recently it only handled the
(3b) case, which is what I tend to use.

On this go-around I didn't test the (3a) case.  If that
starts to work, great; but I was focussing on fixing the
regresssions.  Does it work for you?  (So you can plug
in a B-device to the other end, "later"?)

- Dave