[PATCH 1/3] arm: dts: imx8mm: Sync with Linux 6.3

[Tim Harvey]

On Fri, Apr 28, 2023 at 4:57 AM Adam Ford <aford173 at gmail.com> wrote:
>
> On Thu, Apr 27, 2023 at 5:25 PM Tim Harvey <tharvey at gateworks.com> wrote:
> >
> > On Thu, Apr 27, 2023 at 12:49 PM Fabio Estevam <festevam at gmail.com> wrote:
> > >
> > > On Thu, Apr 27, 2023 at 4:44 PM Tim Harvey <tharvey at gateworks.com> wrote:
> > >
> > > > Fabio,
> > > >
> > > > Sorry for the confusion.
> > > >
> > > > This imx8mm dt sync patch will hang on imx8mm boards that use 'both'
> > > > usbotg1 and usbotg2. You can reproduce this hang on your imx8mm-evk by
> > > > enabling usbotg2 in the dt (the board has it but it is not enabled due
> > > > to the gpio based usb 3.0 mux not being sorted out yet):
> > > > +&usbotg2 {
> > > > +       dr_mode = "otg";
> > > > +       status = "okay";
> > > > +};
> > > > +
> > > >
> > > > u-boot=> usb start && usb tree
> > > > starting USB...
> > > > Bus usb at 32e40000: Bus usb at 32e50000:
> > > > ^^^ imx8mm-evk hangs
> > >
> > > Yes, I can reproduce the hang, but it happens with or without the
> > > imx8mm dt sync.
> > >
> >
> > Fabio,
> >
> > I do 'not' see a hang on imx8mm-evk on 'usb start && usb tree' on
> > master (my other issue was on a 'usb stop' but only with usb
> > controllers in host mode).
> >
> > > This hang is a separate issue, not dt related, as far as I understand.
> > >
> > > The imx8mm dts sync does solve the issue of running 'ums' after CTRL+C.
> >
> > I don't agree. The hang 'is' related because all my imx8mm-venice-*
> > boards which use 'both' USB controllers hang with this patch on a 'usb
> > start' and don't hang without it. While a basic 'review' of the patch
> > looks good but actual product testing shows issues. As a maintainer
> > for ARM FREESCALE IMX you must have another imx8mm board which uses
> > both usbotg devices to test against and verify you see what I see?
> >
> > Until we know what other fix is needed to go along with this:
> > Nacked-by: Tim Harvey <tharvey at gateworks.com>
>
> What is the harm is sync'ing the device tree with the kernel? I seemed
> like you found a solution with the regulator patch.  Did I
> misunderstand that?
>
> adam

Adam,

No, the regulator patch did 'not' resolve the issue created by syncing
the imx8mm dt (I caused confusion by responding to the wrong thread -
the regulator patch resolved a different issue).

Could you please verify my results on a board that uses both usbotg1
and usbotg2? What I see is on master + this imx8mm dt sync
(specifically the changes from Linux commit 4585c79ff477f ("arm64:
dts: imx8mm: correct usb power domains")) the board hangs on usb start
when bringing up usbotg2.

Best Regards,

Tim