vicodec: a couple fixes towards spec compliancy

Given the stateful codec specification is still a moving target, it doesn't make any sense to try to comply fully with it.

On the other side, we can still comply with some basic userspace expectations, with just a couple small changes.

This series implements proper resolution changes propagation, and fixes the CMD_STOP so it actually works.

The intention of this series is to be able to test this driver using already existing userspace, gstreamer in particular. With this changes, it's possible to construct variations of this pipeline:

gst-launch-1.0 videotestsrc ! v4l2fwhtenc ! v4l2fwhtdec ! fakevideosink

Also, as discussed in v1 feedback [1,2], I'm including pixel format helpers, as RFC for now. Hans, Tomasz: is this what you had in mind?

[1] https://www.spinics.net/lists/linux-media/msg141912.html
[2] https://www.spinics.net/lists/linux-media/msg142099.html

v2:
* Add more info to commit logs
* Propagate changes on both encoders and decoders
* Add pixel format helpers

Ezequiel Garcia (4):
media: Introduce helpers to fill pixel format structs
vicodec: Use pixel format helpers
vicodec: Propagate changes to the CAPTURE queue
vicodec: Implement spec-compliant stop command

 .../media/platform/vicodec/codec-v4l2-fwht.c  |  42 ++--
 .../media/platform/vicodec/codec-v4l2-fwht.h  |   3 -
 drivers/media/platform/vicodec/vicodec-core.c | 197 +++++++++---------
 drivers/media/v4l2-core/Makefile              |   2 +-
 drivers/media/v4l2-core/v4l2-common.c         |  66 ++++++
 drivers/media/v4l2-core/v4l2-fourcc.c         |  93 +++++++++
 include/media/v4l2-common.h                   |   5 +
 include/media/v4l2-fourcc.h                   |  53 +++++
 8 files changed, 332 insertions(+), 129 deletions(-)
 create mode 100644 drivers/media/v4l2-core/v4l2-fourcc.c
 create mode 100644 include/media/v4l2-fourcc.h

2.19.1