Message-ID: <8db00a4b6faa99c940d9bc86e17161eb0db5efe3.camel@ndufresne.ca>
Date:   Tue, 09 Nov 2021 10:57:28 -0500
From:   Nicolas Dufresne <nicolas@...fresne.ca>
To:     Adam Ford <aford173@...il.com>
Cc:     linux-media <linux-media@...r.kernel.org>,
        Tim Harvey <tharvey@...eworks.com>,
        Schrempf Frieder <frieder.schrempf@...tron.de>,
        Marek Vasut <marek.vasut@...il.com>,
        Jagan Teki <jagan@...rulasolutions.com>,
        Adam Ford-BE <aford@...conembedded.com>,
        cstevens@...conembedded.com,
        Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        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>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Lucas Stach <l.stach@...gutronix.de>,
        Joakim Zhang <qiangqing.zhang@....com>,
        Alice Guo <alice.guo@....com>, Peng Fan <peng.fan@....com>,
        "open list:HANTRO VPU CODEC DRIVER" 
        <linux-rockchip@...ts.infradead.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:STAGING SUBSYSTEM" <linux-staging@...ts.linux.dev>
Subject: Re: [RFC 0/5] arm64: imx8mm: Enable Hantro VPUs

Le lundi 08 novembre 2021 à 10:33 -0600, Adam Ford a écrit :
> On Mon, Nov 8, 2021 at 7:59 AM Nicolas Dufresne <nicolas@...fresne.ca> wrote:
> > 
> > Hi Adam,
> > 
> > thanks for you work, I'll try and reply  about the GStreamer questions below, if
> > you have further question feel free to ask.
> > 
> > Le samedi 06 novembre 2021 à 13:37 -0500, Adam Ford a écrit :
> > > 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, so a new compatible flag is required.
> > > 
> > > This is an RFC because I don't have functional video on my system yet,
> > > and I'm hoping there might be people who do and can help test this.
> > > I have only tested this far enough to see they enumerate and appear
> > > as /dev/videoX and /dev/mediaX devices.
> > 
> > I will check the patchset, but you need in the mini-variant to disable the G1
> > post processor, because this block was fused out. We didn't make it optional
> 
> Thanks for being willing to review this.
> 
> > from the start as according to the V1 of the TRM it was there, but that error
> > was corrected in V3.
> 
> Thanks for the clarification.  It wasn't obvious to me, because in
> some instances the PP looked like it was there and sometimes not
> there.  I'll remove the postproc stuff.
> 
> > 
> > > 
> > > I am also curious to know if/what gstreamer plugins are necessary.  In
> > > NXP's custom kernel, there are IMX-specific plugins, and I was hoping there
> > > would be more generic plugins that I can use to test.  I am hoping some
> > > of the linux-media experts might chime in on how to best test.
> > 
> > I will recommend using GStreamer 1.19.3 or main branch (GStreamer is now a
> > single git repo). You will then be able to test Hantro G1 decoding of MPEG2,
> > H264 and VP8. Remember that the related plugin depends on libgudev (a glib
> > binding of udev).
> 
> Thanks for the tip.
> 
> > 
> > For the encoder, I believe only JPEG maybe supported, since this is all there is
> > mainline for RK3288 (and perhaps other RK). But this will need testing and
> > debugging as the G1 version is slightly newer on NXP SoC.
> 
> For what it's worth the G1 seems to repond cleanly to the inquiries
> from v42-compliance.
> The G2 throws some splat when I run v4l2-compliance, but I am still
> investigating that.
> 
> [  405.456979] ------------[ cut here ]------------
> [  405.464173] WARNING: CPU: 0 PID: 563 at mm/page_alloc.c:5344
> __alloc_pages+0x5a4/0xbe0
> [  405.472104] Modules linked in: 8021q garp mrp stp llc caam_jr
> caamhash_desc caamalg_desc crypto_engine rng_core authenc libdes
> imx7_media_csi(C) crct10dif_ce imx_media_common(C)
> snd_soc_fsl_asoc_card imx7_mipi_csis(C) snd_soc_imx_audmux
> snd_soc_simple_card_utils fsl_imx8_ddr_perf imx8m_ddrc brcmfmac
> brcmutil hantro_vpu(C) v4l2_h264 v4l2_mem2mem videobuf2_vmalloc
> videobuf2_dma_contig videobuf2_memops cfg80211 ov5640 videobuf2_v4l2
> v4l2_fwnode v4l2_async videobuf2_common videodev etnaviv gpu_sched
> hci_uart mc btqca btbcm snd_soc_wm8962 at24 spi_imx rtc_pcf85363
> rtc_snvs clk_bd718x7 spi_bitbang snvs_pwrkey snd_soc_fsl_sai
> imx_pcm_dma caam error bluetooth imx8mm_thermal ecdh_generic
> imx_cpufreq_dt ecc rfkill fuse drm ipv6
> [  405.535835] CPU: 0 PID: 563 Comm: v4l2-compliance Tainted: G      D
>  C        5.15.0-next-20211105-00010-g4bb8e8a25d3c-dirty #28
> [  405.547401] Hardware name: Beacon EmbeddedWorks i.MX8M Mini
> Development Kit (DT)
> [  405.554797] pstate: 20000005 (nzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> [  405.561762] pc : __alloc_pages+0x5a4/0xbe0
> [  405.565861] lr : __dma_direct_alloc_pages+0x17c/0x1e0
> [  405.570917] sp : ffff800012443810
> [  405.574232] x29: ffff800012443810 x28: 0000000000000000 x27: ffff000005288220
> [  405.581375] x26: 0000000000000034 x25: 0000000000000000 x24: ffff000000259010
> [  405.588517] x23: ffff80001011ab7c x22: ffff000000259010 x21: 00000000ffffffff
> [  405.595659] x20: 0000000000000cc1 x19: 0000000000000000 x18: 0000000000000000
> [  405.602803] x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000
> [  405.609947] x14: 0000000000000001 x13: 0000000000000000 x12: 0000000000000000
> [  405.617090] x11: ffff80001241d000 x10: ffff00000528833a x9 : ffff00000528832a
> [  405.624232] x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000cc0
> [  405.631378] x5 : 00000000bfffffff x4 : ffff000009e30dc0 x3 : 0000000000000000
> [  405.638520] x2 : 0000000000000000 x1 : 0000000000000001 x0 : 0000000000000cc1
> [  405.645666] Call trace:
> [  405.648113]  __alloc_pages+0x5a4/0xbe0
> [  405.651862]  __dma_direct_alloc_pages+0x17c/0x1e0
> [  405.656569]  dma_direct_alloc+0x70/0x310
> [  405.660494]  dma_alloc_attrs+0x7c/0xe4
> [  405.664246]  hantro_hevc_get_ref_buf+0x15c/0x184 [hantro_vpu]
> [  405.670021]  hantro_g2_hevc_dec_run+0x3b8/0x1910 [hantro_vpu]
> [  405.675791]  device_run+0xac/0x110 [hantro_vpu]
> [  405.680345]  v4l2_m2m_try_run+0xac/0x1b0 [v4l2_mem2mem]
> [  405.685598]  v4l2_m2m_ioctl_streamon+0x84/0xa0 [v4l2_mem2mem]
> [  405.691366]  v4l_streamon+0x28/0x34 [videodev]
> [  405.695877]  __video_do_ioctl+0x178/0x3dc [videodev]
> [  405.700897]  video_usercopy+0x368/0x6dc [videodev]
> [  405.705745]  video_ioctl2+0x1c/0x30 [videodev]
> [  405.710246]  v4l2_ioctl+0x44/0x64 [videodev]
> [  405.714574]  __arm64_sys_ioctl+0xac/0xf0
> [  405.718502]  invoke_syscall+0x48/0x114
> [  405.722258]  el0_svc_common.constprop.0+0xd4/0xfc
> [  405.726969]  do_el0_svc+0x2c/0x94
> [  405.730286]  el0_svc+0x28/0x80
> [  405.733348]  el0t_64_sync_handler+0xa8/0x130
> [  405.737619]  el0t_64_sync+0x1a0/0x1a4
> [  405.741287] ---[ end trace 270ed4a899803006 ]---
> 
> The H1 encoder seems to hang the system when I run v4l2-compliance on
> it when H1 is set up as I submitted the patch.  I tried dropping all
> the encoder formats except the JPEG format, and it doesn't hang any
> more, but it also doesn't really do anything.
> The datasheet only references VPU_H1 as supporting VP8 and H.264, so I
> am not sure JPEG is even supported.

If JPEG is not supported, then there is nothing left for mainline in this
regard. The kernel control interface and encoding flow needs to be designed and
specified for encoders like VP8 and H264. Some prototypes and prior-art exist
though, but nothing ever got formalized in the form of a specification.

> 
> The log from v4l2-compliance on the H1 with everything except the JPEG
> removed looks like:
> 
> root@...con-imx8mm-kit:~# v4l2-compliance -d2
> v4l2-compliance SHA: not available
> , 64 bits, 64-bit time_t
> 
> Segmentation fault
> root@...con-imx8mm-kit:~#
> Message from syslogd@  at Thu Jan  1 00:05:07 1970 ...
> : Internal error: Oops: 96000004 [#2] SMP
> 
> Message from syslogd@  at Thu Jan  1 00:05:07 1970 ...
> : Code: 52800001 aa1403e0 d2801802 95c31ab9 (b9400aa1)
> 
> I want to install Gstreamer, but I don't have functioning DSI video,
> so I am not entirely sure how I will go about testing the decoders
> except by using fakesink

We too don't have an mainline DSI to test the CODECs on recent NXP SoC. For
decoders we use fluster, a tool that runs publicly available conformance test.
It will simply decode to disk and compare a checksum of the decoded image
against the compliant checksum (produced by the reference decoders). For you
interested, it uses the new videocodectestsink, which is specialized for
producing or calculating conformance image/checksum.

https://github.com/fluendo/fluster

We have added support for GStreamer stateless decoders already.

> 
> If the G1 ends up working with some of the newer Gstreamer stuff, I
> might just submit a formal patch to just enable the G1 for now.

This looks like a good idea indeed.

> 
> adam
> > 
> > > 
> > > Lastly, I didn't update any device tree binding YAML files, because
> > > I know there have been some discussions about the power domains on the
> > > imx8mq, and I wasn't sure if the imx8mm should get a separate YAML file
> > > or if the existing one for te imx8mq should just be modified.
> > > 
> > > This will likely require the following series in order to apply correctly:
> > > https://patchwork.kernel.org/project/linux-arm-kernel/list/?series=576407
> > > 
> > > Adam Ford (5):
> > >   media: hantro: Add support for i.MX8M Mini
> > >   arm64: dts: imx8mm:  Enable VPU-G1 and VPU-G2
> > >   media: hantro: Rename ROCKCHIP_VPU_ENC_FMT to HANTRO_VPU_ENC_FMT
> > >   media: hantro: Add H1 encoder support on i.MX8M Mini
> > >   arm64: dts: imx8mm:  Enable Hantro H1 Encoder
> > > 
> > >  arch/arm64/boot/dts/freescale/imx8mm.dtsi     |  61 ++++++++
> > >  drivers/staging/media/hantro/hantro_drv.c     |   3 +
> > >  drivers/staging/media/hantro/hantro_hw.h      |  19 ++-
> > >  drivers/staging/media/hantro/imx8m_vpu_hw.c   | 143 ++++++++++++++++++
> > >  .../staging/media/hantro/rockchip_vpu_hw.c    |  26 ++--
> > >  5 files changed, 231 insertions(+), 21 deletions(-)
> > > 
> > 

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