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

[Hans Verkuil]

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.
diff --git a/drivers/gpu/drm/sun4i/sun4i_hdmi.h b/drivers/gpu/drm/sun4i/sun4i_hdmi.h
index 8263de225b36..82bc6923b90f 100644
--- a/drivers/gpu/drm/sun4i/sun4i_hdmi.h
+++ b/drivers/gpu/drm/sun4i/sun4i_hdmi.h
@@ -15,7 +15,7 @@
 #include <drm/drm_connector.h>
 #include <drm/drm_encoder.h>

-#include <media/cec-pin.h>
+#include <media/cec.h>

 #define SUN4I_HDMI_CTRL_REG		0x004
 #define SUN4I_HDMI_CTRL_ENABLE			BIT(31)


Unfortunately you need to change the header as well since cec-pin.h doesn't
exist without the cec patches. It might be better to

And once the cec patch series and the sun4i_hdmi patch is merged the patch above
can be applied with -R and all will work fine.

This seems a sensible way forward.

Regards,

	Hans