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

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Date:   Mon, 20 Dec 2021 11:13:37 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     Nicolas Dufresne <nicolas@...fresne.ca>
Cc:     Tim Harvey <tharvey@...eworks.com>, Adam Ford <aford173@...il.com>,
        Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
        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

On Sat, Dec 18, 2021 at 1:52 AM Nicolas Dufresne <nicolas@...fresne.ca> wrote:
> Le vendredi 17 décembre 2021 à 09:26 -0800, Tim Harvey a écrit :
> > I'm not clear if anyone is working on IMX8MM VPU H1 support. You had
> > mentioned that some support [1] and [2] can be derived from the RK3288
> > using the Google ChromeOS method (a v4l2 plugin that simulates in
> > userspace a stateful encoder). I'm not sure if this is worth pursuing
> > if others are working on stateless encode support in kernel and
> > gstreamer.
>
> My colleagues started last week the project of crafting mainline stateless
> encoder uAPI. This is too early. In older project, we have had good success with
> the emulated stateful encoder. It is of course quite limited, but works in
> gstreamer, ffmpeg and chromium. It is also likely safer compared to the vendor
> provided driver.

If people still want to play with the old emulated stateful encoder, there
is a forward-ported version in the ChromeOS v5.10 kernel now. Note that
RK3288 (H1) support is untested. Also, RK3288 and RK3399 require different
versions of the userspace plugin. And the RK3288 version might require some
updates to add SELECTION API support.


ChenYu