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From:   Adam Ford <aford173@gmail.com>
Date:   Tue, 16 Nov 2021 12:04:36 -0600
Message-ID: <CAHCN7xJrnZMQgXVMJg7MZdFMWyesf6Ph7HnfMH7-9bm1qODHFw@mail.gmail.com>
Subject: Re: [PATCH V3 0/9] arm64: imx8mn: Enable more imx8m Nano functions
To:     Tim Harvey <tharvey@gateworks.com>
Cc:     Linux ARM Mailing List <linux-arm-kernel@lists.infradead.org>,
        Adam Ford-BE <aford@beaconembedded.com>,
        ariel.dalessandro@collabora.com,
        Krzysztof Kozlowski <krzk@kernel.org>,
        Lucas Stach <l.stach@pengutronix.de>,
        Device Tree Mailing List <devicetree@vger.kernel.org>,
        Shawn Guo <shawnguo@kernel.org>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        Pengutronix Kernel Team <kernel@pengutronix.de>,
        Fabio Estevam <festevam@gmail.com>,
        NXP Linux Team <linux-imx@nxp.com>,
        open list <linux-kernel@vger.kernel.org>
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On Tue, Nov 16, 2021 at 11:57 AM Tim Harvey <tharvey@gateworks.com> wrote:
>
> On Thu, Nov 4, 2021 at 9:18 AM Adam Ford <aford173@gmail.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.

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