linux-kernel - Re: [PATCH v6 0/8] Cedrus driver for the Allwinner Video Engine, using media requests

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Date:   Mon, 06 Aug 2018 11:22:43 +0200
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     Hans Verkuil <hverkuil@...all.nl>, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, devel@...verdev.osuosl.org
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        linux-sunxi@...glegroups.com,
        Hugues Fruchet <hugues.fruchet@...com>,
        Randy Li <ayaka@...lik.info>,
        Ezequiel Garcia <ezequiel@...labora.com>,
        Tomasz Figa <tfiga@...omium.org>,
        Alexandre Courbot <acourbot@...omium.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>
Subject: Re: [PATCH v6 0/8] Cedrus driver for the Allwinner Video Engine,
 using media requests

Hi,

On Sat, 2018-08-04 at 14:43 +0200, Hans Verkuil wrote:
> On 07/25/2018 12:02 PM, Paul Kocialkowski wrote:
> > This is the sixth iteration of the updated Cedrus driver,
> > that supports the Video Engine found in most Allwinner SoCs, starting
> > with the A10. It was tested on the A13, A20, A33 and H3.
> > 
> > The initial version of this driver[0] was originally written and
> > submitted by Florent Revest using a previous version of the request API
> > that is necessary to provide coherency between controls and the buffers
> > they apply to.
> > 
> > The driver was adapted to use the latest version of the media request
> > API[1], as submitted by Hand Verkuil. Media request API support is a
> > hard requirement for the Cedrus driver.
> > 
> > The driver itself currently only supports MPEG2 and more codecs will be
> > added to the driver eventually. The output frames provided by the
> > Video Engine are in a multi-planar 32x32-tiled YUV format, with a plane
> > for luminance (Y) and a plane for chrominance (UV). A specific format is
> > introduced in the V4L2 API to describe it.
> > 
> > This implementation is based on the significant work that was conducted
> > by various members of the linux-sunxi community for understanding and
> > documenting the Video Engine's innards.
> > 
> > In addition to the media requests API, the following series are required
> > for Cedrus:
> > * vicodec: the Virtual Codec driver
> 
> This will appear in for 4.19.
>
> > * allwinner: a64: add SRAM controller / system control
> > * SRAM patches from the Cedrus VPU driver series version 5
> 
> What about these? Are they queued up for 4.19 as well?

Yes, they are queued for 4.19 through Maxime's tree[0].

> I'll post a rebased reqv17 later today that includes the
> "add v4l2_ctrl_request_hdl_find/put/ctrl_find functions" patch.

Great, I'll rebase and send a new version (taking in account your latest
review) as soon as time allows!

Cheers,

Paul

[0]: https://git.kernel.org/pub/scm/linux/kernel/git/sunxi/linux.git/log/?h=sunxi/for-next

-- 
Paul Kocialkowski, Bootlin (formerly Free Electrons)
Embedded Linux and kernel engineering
https://bootlin.com

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