linux-kernel - Re: [RFC V2 0/2] arm64: imx8mm: Enable Hantro VPUs

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Date:   Wed, 01 Dec 2021 18:32:28 +0100
From:   Lucas Stach <l.stach@...gutronix.de>
To:     Tim Harvey <tharvey@...eworks.com>, Adam Ford <aford173@...il.com>
Cc:     linux-media@...r.kernel.org, ezequiel@...guardiasur.com.ar,
        hverkuil@...all.nl, nicolas@...fresne.ca, aford@...conembedded.com,
        Rob Herring <robh+dt@...nel.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>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        linux-staging@...ts.linux.dev
Subject: Re: [RFC V2 0/2] arm64: imx8mm: Enable Hantro VPUs

Hi Tim,

Am Mittwoch, dem 01.12.2021 um 09:23 -0800 schrieb Tim Harvey:
> On Tue, Nov 30, 2021 at 5:33 PM Adam Ford <aford173@...il.com> wrote:
> > 
> > The i.MX8M has two Hantro video decoders, called G1 and G2 which appear
> > to be related to the video decoders used on the i.MX8MQ, but because of
> > how the Mini handles the power domains, the VPU driver does not need to
> > handle all the functions, nor does it support the post-processor,
> > so a new compatible flag is required.
> > 
> > With the suggestion from Hans Verkuil, I was able to get the G2 splat to go away
> > with changes to FORCE_MAX_ZONEORDER, but I found I could also set cma=512M, however
> > it's unclear to me if that's an acceptable alternative.
> > 
> > At the suggestion of Ezequiel Garcia and Nicolas Dufresne I have some
> > results from Fluster. However, the G2 VPU appears to fail most tests.
> > 
> > ./fluster.py run -dGStreamer-H.264-V4L2SL-Gst1.0
> > Ran 90/135 tests successfully               in 76.431 secs
> > 
> >  ./fluster.py run -d GStreamer-VP8-V4L2SL-Gst1.0
> > Ran 55/61 tests successfully               in 21.454 secs
> > 
> > ./fluster.py run -d GStreamer-VP9-V4L2SL-Gst1.0
> > Ran 0/303 tests successfully               in 20.016 secs
> > 
> > Each day seems to show more and more G2 submissions, and gstreamer seems to be
> > still working on the VP9, so I am not sure if I should drop G2 as well.
> > 
> > 
> > Adam Ford (2):
> >   media: hantro: Add support for i.MX8M Mini
> >   arm64: dts: imx8mm: Enable VPU-G1 and VPU-G2
> > 
> >  arch/arm64/boot/dts/freescale/imx8mm.dtsi   | 41 +++++++++++++++
> >  drivers/staging/media/hantro/hantro_drv.c   |  2 +
> >  drivers/staging/media/hantro/hantro_hw.h    |  2 +
> >  drivers/staging/media/hantro/imx8m_vpu_hw.c | 57 +++++++++++++++++++++
> >  4 files changed, 102 insertions(+)
> > 
> 
> Adam,
> 
> That's for the patches!
> 
> I tested just this series on top of v5.16-rc3 on an
> imx8mm-venice-gw73xx-0x and found that if I loop fluster I can end up
> getting a hang within 10 to 15 mins or so when imx8m_blk_ctrl_power_on
> is called for VPUMIX pd :
> while [ 1 ]; do uptime; ./fluster.py run -d GStreamer-VP8-V4L2SL-Gst1.0; done
> ...
> [  618.838436] imx-pgc imx-pgc-domain.6: failed to command PGC
> [  618.844407] imx8m-blk-ctrl 38330000.blk-ctrl: failed to power up bus domain
> 
> I added prints in imx_pgc_power_{up,down} and
> imx8m_blk_ctrl_power_{on,off} to get some more context
> ...
> Ran 55/61 tests successfully               in 8.685 secs
>  17:16:34 up 17 min,  0 users,  load average: 3.97, 2.11, 0.93
> ********************************************************************************
> ********************
> Running test suite VP8-TEST-VECTORS with decoder GStreamer-VP8-V4L2SL-Gst1.0
> Using 4 parallel job(s)
> ********************************************************************************
> ********************
> 
> [TEST SUITE      ] (DECODER                    ) TEST VECTOR               ... R
> ESULT
> ----------------------------------------------------------------------
> [ 1023.114806] imx8m_blk_ctrl_power_on vpublk-g1
> [ 1023.119669] imx_pgc_power_up vpumix
> [ 1023.124307] imx-pgc imx-pgc-domain.6: failed to command PGC
> [ 1023.130006] imx8m-blk-ctrl 38330000.blk-ctrl: failed to power up bus domain
> 
> While this wouldn't be an issue with this series it does indicate we
> still have something racy in blk-ctrl. Can you reproduce this (and if
> not what kernel are you based on)? Perhaps you or Lucas have some
> ideas?
> 
Did you have "[PATCH] soc: imx: gpcv2: Synchronously suspend MIX
domains" applied when running those tests? It has only recently been
picked up by Shawn and may have an influence on the bus domain
behavior.

Regards,
Lucas