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

[Maxime Ripard]

Hi Hans,

On Fri, Sep 08, 2017 at 10:59:44AM +0000, Hans Verkuil wrote:
> 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 at 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 at 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.

Thanks for the reminder.

Would that commit work for you:
http://code.bulix.org/19o9y6-201254

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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