On 11/08/17 12:57, Tomi Valkeinen wrote:
> Hi Hans,
> Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
> Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
> On 02/08/17 11:53, Hans Verkuil wrote:
>> From: Hans Verkuil <hans.verk...@cisco.com>
>> This patch series adds CEC support for the omap4. It is based on
>> the 4.13-rc2 kernel with this patch series applied:
>> It is virtually identical to the first patch series posted in
>> The only two changes are in the Kconfig due to CEC Kconfig
>> changes in 4.13 (it now selects CEC_CORE instead of depending on
>> CEC_CORE) and a final patch was added adding a lost_hotplug op
>> since for proper CEC support I have to know when the hotplug
>> signal goes away.
>> Tested with my Pandaboard.
> I'm doing some testing with this series on my panda. One issue I see is
> that when I unload the display modules, I get:
> [ 75.180206] platform 58006000.encoder: enabled after unload, idling
> [ 75.187896] platform 58001000.dispc: enabled after unload, idling
> [ 75.198242] platform 58000000.dss: enabled after unload, idling
> So I think something is left enabled, most likely in the HDMI driver. I
> haven't debugged this yet.
> The first time I loaded the modules I also got "operation stopped when
> reading edid", but I haven't seen that since. Possibly not related to
> this series.
> Are there some simple ways to test the CEC? My buildroot fs has
> cec-compliance, cec-ctl and cec-follower commands. Are you familiar with
> those? Can they be used?
I'm very familiar with them since I wrote them :-)
The latest version of those utilities are maintained here:
But the ones from buildroot should be fine.
cec-ctl --playback # configure the CEC adapter as a playback device
cec-ctl -S # Detect and show all CEC devices
Note: all cec utilities use /dev/cec0 as the default device node. Use the
-d option to specify another device node.
So assuming you have the panda connected to a CEC-capable TV you should see
the TV in that list.
You can use cec-compliance to check the CEC compliance of devices:
cec-follower # emulate a CEC playback device follower functionality
In another shell run:
cec-compliance -r0 # Test remote CEC device with logical address 0 (== TV)