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

[Hans Verkuil <hverkuil@xs4all.nl>]

Hi Maxime,

On 07/18/17 18:29, Maxime Ripard wrote:
> Hi,
> 
> On Tue, Jul 11, 2017 at 11:06:52PM +0200, Hans Verkuil wrote:
>> On 11/07/17 22:39, Maxime Ripard wrote:
>>> On Tue, Jul 11, 2017 at 08:30:33AM +0200, 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).
>>>
>>> For the whole serie:
>>> Reviewed-by: Maxime Ripard <maxime.ripard@free-electrons.com>
>>>
>>>> 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.
>>>
>>> We'll probably have a number of reworks for 4.14, so it would be
>>> better if I merged it.
>>>
>>> However, I guess if we just switch to a depends on CEC_PIN instead of
>>> a select, everything would just work even if we merge your patches in
>>> a separate tree, right?
>>
>> This small patch will do it:
>>
>> diff --git a/drivers/gpu/drm/sun4i/Kconfig b/drivers/gpu/drm/sun4i/Kconfig
>> index e884d265c0b3..ebad80aefc87 100644
>> --- a/drivers/gpu/drm/sun4i/Kconfig
>> +++ b/drivers/gpu/drm/sun4i/Kconfig
>> @@ -25,7 +25,7 @@ config DRM_SUN4I_HDMI_CEC
>>         bool "Allwinner A10 HDMI CEC Support"
>>         depends on DRM_SUN4I_HDMI
>>         select CEC_CORE
>> -       select CEC_PIN
>> +       depends on CEC_PIN
>>         help
>>  	  Choose this option if you have an Allwinner SoC with an HDMI
>>  	  controller and want to use CEC.

Just a reminder: now that both this driver and the CEC_PIN code has been
merged in 4.14, this 'depends on' can become a 'select' again.

Regards,

	Hans