[PATCH v2 0/1] Virtio Video V4L2 driver

Dmitry Sepp
2020-02-18T20:33:27Z

Hi all,

This is a v4l2 virtio video driver for the virtio-video device
specification v3 [1].

The first version of the driver was introduced here [2].

Changes v1 -> v2:
* support the v3 spec (mostly)
* add a module parameter to ask for pages from ZONE_DMA

What is not implemented:
* Plane layout flags should be used to propagate number of planes to
user-space
* There is no real use of stream creation with bitstream format in the
parameter list. The driver just uses the first bitstream format from
the list.
* Setting bitrate is done in a different way compared to the spec. This
is because it has been already agreed on that the way the spec
currently describes it requires changes.

Potential improvements:
* Do not send stream_create from open. Use corresponding state machine
condition to do this.
* Do not send stream_destroy from close. Do it in reqbufs(0).
* Cache format and control settings. Reduce calls to the device.

Best regards,
Dmitry.

[1] https://markmail.org/message/dmw3pr4fuajvarth
[2] https://markmail.org/message/wnnv6r6myvgb5at6