linux-kernel - Re: [PATCH V3 0/9] arm64: imx8mn: Enable more imx8m Nano functions

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Date:   Tue, 16 Nov 2021 10:27:47 -0800
From:   Tim Harvey <tharvey@...eworks.com>
To:     Adam Ford <aford173@...il.com>
Cc:     Linux ARM Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Adam Ford-BE <aford@...conembedded.com>,
        ariel.dalessandro@...labora.com,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Lucas Stach <l.stach@...gutronix.de>,
        Device Tree Mailing List <devicetree@...r.kernel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V3 0/9] arm64: imx8mn: Enable more imx8m Nano functions

On Tue, Nov 16, 2021 at 10:04 AM Adam Ford <aford173@...il.com> wrote:
>
> On Tue, Nov 16, 2021 at 11:57 AM Tim Harvey <tharvey@...eworks.com> wrote:
> >
> > On Thu, Nov 4, 2021 at 9:18 AM Adam Ford <aford173@...il.com> wrote:
> > >
> > > The i.MX8M Nano is similar to the i.MX8M Mini in some ways, but very
> > > different in others.  With the blk-ctrl driver for Mini in place,
> > > this series expands the blk-ctrl driver to support the Nano which
> > > opens the door for additional functions in the future.  As part of
> > > this series, it also addresses some issues in the GPCv2 driver and
> > > finally adds support for enabling USB and GPU.
> > >
> > > V3:  Fixes an the yaml example
> > > V2:  Fixes the clock count in the blk-ctrl
> > >
> > > Adam Ford (9):
> > >   soc: imx: gpcv2: keep i.MX8MN gpumix bus clock enabled
> > >   soc: imx: gpcv2: Add dispmix and mipi domains to imx8mn
> > >   dt-bindings: power: imx8mn: add defines for DISP blk-ctrl domains
> > >   dt-bindings: soc: add binding for i.MX8MN DISP blk-ctrl
> > >   soc: imx: imx8m-blk-ctrl: add i.MX8MN DISP blk-ctrl
> > >   arm64: dts: imx8mn: add GPC node
> > >   arm64: dts: imx8mn: put USB controller into power-domains
> > >   arm64: dts: imx8mn: add DISP blk-ctrl
> > >   arm64: dts: imx8mn: Enable GPU
> > >
> > >  .../soc/imx/fsl,imx8mn-disp-blk-ctrl.yaml     |  97 +++++++++++++++++
> > >  arch/arm64/boot/dts/freescale/imx8mn.dtsi     | 103 ++++++++++++++++++
> > >  drivers/soc/imx/gpcv2.c                       |  26 +++++
> > >  drivers/soc/imx/imx8m-blk-ctrl.c              |  75 ++++++++++++-
> > >  include/dt-bindings/power/imx8mn-power.h      |   5 +
> > >  5 files changed, 305 insertions(+), 1 deletion(-)
> > >  create mode 100644 Documentation/devicetree/bindings/soc/imx/fsl,imx8mn-disp-blk-ctrl.yaml
> > >
> >
> > Adam,
> >
> > Thanks for the patches. I'm not sure how best to test this but on an
> > imx8mm-venice-gw7902 which has USB, but no display.
> >
> > I find that if DRM_ETNAVIV is enabled I hang at 'etnaviv etnaviv:
> > bound 38000000.gpu (ops 0xffff800010964748)'.
>
> Thanks for testing this.
>
> Does your board send power to the GPU?  I recall someone somewhere
> didn't power theirGPU, but I can't remember who and/or what board was
> being discussed.

Yes, the imx8mm-venice-gw7902 does have the GPU powered (the
imx8mm-venice-gw7901 was the one that did not).

Tim

>
> I'll run some more tests on the latest 5.16-rc1 to see if I can
> replicate your issue.
>
> adam
> >
> > If DRM_ETNAVIV is not enabled:
> > - boots fine
> > - usb works
> > - soft reboot works (does not hang)
>
> At least we have some progress.  :-)
>
> adam
> >
> > Best regards,
> >
> > Tim