Re: Help wanted with USB and OMAP3 off_mode

[NeilBrown <neilb@suse.de>]

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On Wed, 09 Jan 2013 12:42:43 +0100 Michael Trimarchi
<michael@amarulasolutions.com> wrote:

> On 01/09/2013 12:34 PM, NeilBrown wrote:
> > On Wed, 09 Jan 2013 11:24:09 +0100 Michael Trimarchi
> > <michael@amarulasolutions.com> wrote:
> > 
> >> Hi Neil
> >>
> >> On 01/09/2013 11:19 AM, NeilBrown wrote:
> >>> On Wed, 09 Jan 2013 12:00:05 +0200 Igor Grinberg <grinberg@compulab.co.il>
> >>> wrote:
> >>>
> >>>> -----BEGIN PGP SIGNED MESSAGE-----
> >>>> Hash: SHA1
> >>>
> >>>> Hi Neil,
> >>>
> >>>> On 01/09/13 00:29, NeilBrown wrote:
> >>>>>
> >>>>> Hi,
> >>>>>  I'm trying to get off_mode working reliably on my gta04 mobile phone.
> >>>>>
> >>>>> My current stumbling block is USB.  The "Option" GSM module is attached via
> >>>>> USB (there is a separate transceiver chip attached to port 1 which is placed
> >>>>> in OMAP_EHCI_PORT_MODE_PHY).
> >>>
> >>>> Which PHY is this (vendor/model)?
> >>>
> >>> Hi Igor,
> >>>   it is the SMSC USB3322
> >>>
> >>> http://www.smsc.com/media/Downloads_Public/Data_Sheets/3320.pdf
> >>>
> >>>
> >>> BTW I subsequently discovered that keeping USBHOST out off off_mode only
> >>> sometimes avoid the problem, not always.  So there are probably multiple
> >>> issues :-(
> >>
> >> Are you sure that you don't have glitch on power, reset pin during suspend?
> >>
> > 
> > No, I don't really have the equipment to measure such things.
> > But is it likely?  Would enabling off_mode make it more likely?
> > Can you suggest some way I could test the hypothesis?
> > 
> > The power pin is connected to a 3v3 regulator which certainly should stay on
> > the whole time and other things which depend on it keep working.
> > 
> > The reset line is connected to GPIO174 which is configured:
> > 
> > # cat /sys/kernel/debug/omap_mux/mcspi1_cs0
> > name: mcspi1_cs0.gpio_174 (0x480021ce/0x19e = 0x011c), b ac2, t NA
> > mode: OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE4
> > signals: mcspi1_cs0 | sdmmc2_dat7 | NA | NA | gpio_174 | NA | NA | safe_mode
> > 
> > The "PIN_INPUT" seems a bit odd, so I changed it to OMAP_PIN_OUTPUT but that
> > didn't appear to make any difference.
> > 
> 
> Can you try to add this OMAP_PIN_OFF_OUTPUT_HIGH or LOW? It's suppose to be the off_mode status of the pin.
> Is it correct?
> 

You only set OMAP_PIN_OFF_OUTPUT_HIGH etc if you want the status  in
offmode to be different to what is was before off mode.
In the normal case without any of these bits set, the current value is
latched when output in entered and it remains like that that until you
leave off_mode.

Thanks,
NeilBrown

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