linux-kernel - Re: [RFC 0/5] arm64: imx8mm: Enable Hantro VPUs

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Message-ID: <CAAEAJfBXU-AiKKhkhXzgUSR4p1yefysNuHFycBz3F-GzNewS6w@mail.gmail.com>
Date:   Fri, 17 Dec 2021 01:48:52 -0300
From:   Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
To:     Adam Ford <aford173@...il.com>
Cc:     Tim Harvey <tharvey@...eworks.com>,
        Nicolas Dufresne <nicolas@...fresne.ca>,
        linux-media <linux-media@...r.kernel.org>,
        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,
        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

Hi Adam,

>
> I will post a V2 last today with the Mini's post-processing removed.
> Someone, I apologize that I forget who, mentioned it was fused out of
> the Mini, so the testing I've been doing was with that removed and I
> removed the H1 encoder since the Mini doesn't support JPEG encoding.
>
[...]

Resurrecting this thread here. IMX8MMRM Rev. 0, 02/2019 mentions
post-processor features for G1 and G2.

Have you checked the fuse and synth registers to see if they throw
any useful information about the hardware? For instance,
comparing PP fuse register (SWREG99) and
Synthesis configuration register post-processor (SWREG100)
in both 8MQ and 8MM could be useful.

As I mentioned on my previous mail, even if G1 PP is disabled
on the Mini, I would imagine the G2 can do linear NV12 (aka raster-scan)
which in our hantro driver jargon is a  "post-processed" format :-)

Thanks,
Ezequiel