Re: [PATCH 00/11] drm/sun4i: add CEC support

[Hans Verkuil <hverkuil@xs4all.nl>]

On 11/07/17 08:30, Hans Verkuil wrote:
> From: Hans Verkuil <hans.verkuil@cisco.com>
> 
> This patch series adds CEC support for the sun4i HDMI controller.
> 
> The CEC hardware support for the A10 is very low-level as it just
> controls the CEC pin. Since I also wanted to support GPIO-based CEC
> hardware most of this patch series is in the CEC framework to
> add a generic low-level CEC pin framework. It is only the final patch
> that adds the sun4i support.
> 
> This patch series first makes some small changes in the CEC framework
> (patches 1-4) to prepare for this CEC pin support.
> 
> Patch 5-7 adds the new API elements and documents it. Patch 6 reworks
> the CEC core event handling.
> 
> Patch 8 adds pin monitoring support (allows userspace to see all
> CEC pin transitions as they happen).
> 
> Patch 9 adds the core cec-pin implementation that translates low-level
> pin transitions into valid CEC messages. Basically this does what any
> SoC with a proper CEC hardware implementation does.
> 
> Patch 10 documents the cec-pin kAPI (and also the cec-notifier kAPI
> which was missing).
> 
> Finally patch 11 adds the actual sun4i_hdmi CEC implementation.
> 
> I tested this on my cubieboard. There were no errors at all
> after 126264 calls of 'cec-ctl --give-device-vendor-id' while at the
> same time running a 'make -j4' of the v4l-utils git repository and
> doing a continuous scp to create network traffic.
> 
> This patch series is based on top of the mainline kernel as of
> yesterday (so with all the sun4i and cec patches for 4.13 merged).
> 
> Maxime, patches 1-10 will go through the media subsystem. How do you
> want to handle the final patch? It can either go through the media
> subsystem as well, or you can sit on it and handle this yourself during
> the 4.14 merge window. Another option is to separate the Kconfig change
> into its own patch. That way you can merge the code changes and only
> have to handle the Kconfig patch as a final change during the merge
> window.

I forgot to mention that if you want to use pin monitoring, then the
updated cec-ctl is found here:

https://git.linuxtv.org/hverkuil/v4l-utils.git/log/?h=cec-mon-pin2

To start pin monitoring run:

sudo cec-ctl --monitor-pin

Add the -v flag to see each bit transition.

When in pin monitoring mode it will analyze the low-level protocol and
warn for incorrect bit periods, etc. To be really accurate the CPU should
be lightly loaded.

Regards,

	Hans

> 
> Regards,
> 
> 	Hans
> 
> Hans Verkuil (11):
>   cec: improve transmit timeout logging
>   cec: add *_ts variants for transmit_done/received_msg
>   cec: add adap_free op
>   cec-core.rst: document the adap_free callback
>   linux/cec.h: add pin monitoring API support
>   cec: rework the cec event handling
>   cec: document the new CEC pin capability, events and mode
>   cec: add core support for low-level CEC pin monitoring
>   cec-pin: add low-level pin hardware support
>   cec-core.rst: include cec-pin.h and cec-notifier.h
>   sun4i_hdmi: add CEC support
> 
>  Documentation/media/kapi/cec-core.rst              |  40 ++
>  .../media/uapi/cec/cec-ioc-adap-g-caps.rst         |   7 +
>  Documentation/media/uapi/cec/cec-ioc-dqevent.rst   |  20 +
>  Documentation/media/uapi/cec/cec-ioc-g-mode.rst    |  19 +-
>  drivers/gpu/drm/sun4i/Kconfig                      |   9 +
>  drivers/gpu/drm/sun4i/sun4i_hdmi.h                 |   8 +
>  drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c             |  57 +-
>  drivers/media/Kconfig                              |   3 +
>  drivers/media/cec/Makefile                         |   4 +
>  drivers/media/cec/cec-adap.c                       | 196 +++--
>  drivers/media/cec/cec-api.c                        |  73 +-
>  drivers/media/cec/cec-core.c                       |   2 +
>  drivers/media/cec/cec-pin.c                        | 794 +++++++++++++++++++++
>  include/media/cec-pin.h                            | 183 +++++
>  include/media/cec.h                                |  64 +-
>  include/uapi/linux/cec.h                           |   8 +-
>  16 files changed, 1389 insertions(+), 98 deletions(-)
>  create mode 100644 drivers/media/cec/cec-pin.c
>  create mode 100644 include/media/cec-pin.h
>