On Wed, Oct 06, 2010 at 05:29:33AM -0500, David Brownell wrote:
what happens, then, if e.g. device has usb charging and
devicde starts
to boot when you connect usb cable. Then, by the time link
(in this case
musb) probes it will have lost the VBUS notification from phy.
That should be trivial: enter the B-mode OTG
stage machine and set the relevant flags, as well
as updating the OTG state. Remember it doesn't
care about the notification, just the OTG state.
The transceiver/phy driver can do that.
Link needs to know about that somehow.
It can see that the otg_transceiver's default_a
flag is clear. Probably doesn't want to switch
on all the default-b states, for simplicity.
We want to keep link powered down until we get a) VBUS IRQ or b) ID pin
IRQ. There's no point turning it on before that since USB cable isn't
connected anyway. If you say checking xceiv->state is enough, then it's
enough :-p
--
balbi
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