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SubjectRe: [PATCH v9 5/9] media: platform: Add Cedrus VPU decoder driver
Hi Hans,

On Fri, Sep 07, 2018 at 03:13:19PM +0200, Hans Verkuil wrote:
> On 09/07/2018 12:24 AM, Paul Kocialkowski wrote:
> > From: Paul Kocialkowski <>
> >
> > This introduces the Cedrus VPU driver that supports the VPU found in
> > Allwinner SoCs, also known as Video Engine. It is implemented through
> > a V4L2 M2M decoder device and a media device (used for media requests).
> > So far, it only supports MPEG-2 decoding.
> >
> > Since this VPU is stateless, synchronization with media requests is
> > required in order to ensure consistency between frame headers that
> > contain metadata about the frame to process and the raw slice data that
> > is used to generate the frame.
> >
> > This driver was made possible thanks to the long-standing effort
> > carried out by the linux-sunxi community in the interest of reverse
> > engineering, documenting and implementing support for the Allwinner VPU.
> >
> > Signed-off-by: Paul Kocialkowski <>
> > Acked-by: Maxime Ripard <>
> One high-level comment:
> Can you add a TODO file for this staging driver? This can be done in
> a follow-up patch.
> It should contain what needs to be done to get this out of staging:
> - Request API needs to stabilize
> - Userspace support for stateless codecs must be created

On that particular note, as part of the effort to develop the driver,
we've also developped two userspace components:

- v4l2-request-test, that has a bunch of sample frames for various
codecs and will rely solely on the kernel request api (and DRM for
the display part) to test and bringup a particular driver

- libva-v4l2-request, that is a libva implementation using the
request API

Did you have something else in mind?


Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
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