[RFC V2 0/2] arm64: imx8mm: Enable Hantro VPUs

[Adam Ford]

On Wed, Dec 1, 2021 at 11:32 AM Lucas Stach <l.stach at pengutronix.de> wrote:
>
> 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 at gmail.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?

i have not seen an issue with my implementation, but used
media-staging [1] for the last attempt to try to get as much of the
latest hantro driver integration, although the VP9 stuff isn't quite
ready yet on the g2-VPU

[1] - https://git.linuxtv.org/media_stage.git/log/drivers/staging/media/hantro

> >
> 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.

I didn't know about this one either, so I'll try it.

When I was attempting to read registers from the H1 vpu, I had to set
"keep_clocks = true" for the H1 power domain or it would hang.  If the
patch Lucas suggests doesn't work, you could try keeing the G1 or G2
clocks on.  I believe it's already set for the vpumix, but the G1, G2
and H1 clocks are not touched by the vpumix, just the
IMX8MM_CLK_VPU_DEC_ROOT.

>
> Regards,
> Lucas
>