Hi Stefan,
Am Donnerstag, 13. Januar 2022, 15:36:38 CET schrieb Stefan Agner:
> Hi Neil,
>
> I am trying to use HDMI CEC on ODROID-N2+ using Linux 5.10.91. However,
> I was unsuccessful: As far as I can tell cec-client uses the right
> device (I disabled CONFIG_DRM_DW_HDMI_CEC since my kernel is still
> missing your patch "drm/meson: dw-hdmi: disable DW-HDMI CEC
> sub-driver"). But communication won't work, and dmesg prints timeout
> messages:
>
> [ 68.831253] cec-meson_g12a_ao_cec: message ff 84 20 00 06 timed out
> [ 71.134987] cec-meson_g12a_ao_cec: message ff 87 00 15 82 timed out
> [ 73.438826] cec-meson_g12a_ao_cec: message f0 timed out
> [ 75.742677] cec-meson_g12a_ao_cec: message f0 timed out
> [ 78.046555] cec-meson_g12a_ao_cec: message f0 timed out
> [ 80.350446] cec-meson_g12a_ao_cec: message f0 timed out
> [ 82.654358] cec-meson_g12a_ao_cec: message 11 timed out
> [ 84.958285] cec-meson_g12a_ao_cec: message 11 timed out
> [ 87.262194] cec-meson_g12a_ao_cec: message 11 timed out
> [ 89.566130] cec-meson_g12a_ao_cec: message 11 timed out
>
> I did a quick test with CoreELEC which uses the 4.9 downstream kernel,
> CEC seems to work there. So it does not seem to be my hardware setup.
>
> A quick test with the latest Linux 5.16 shows the same errors.
>
> Do you happen to have an idea? Do you know if HDMI CEC using upstream
> kernels worked at one point on that particular platform?
I'm using Arch Linux on my ODROID-n2 (non-plus) and HDMI CEC works as
expected.
Currently I'm running a 5.15.13-1-aarch64-ARCH kernel. AFAICS the mentioned
patch is mainline since v5.14. I can see my TV without issues. I have to add
that not every cable is suitable for HDMI CEC, I have one where CEC does not
work (in general).
HTH
Alexander
------
$ cec-ctl --playback
$ cec-ctl -S
Driver Info:
Driver Name : meson-ao-cec-g12a
Adapter Name : meson_g12a_ao_cec
Capabilities : 0x0000011e
Logical Addresses
Transmit
Passthrough
Remote Control Support
Connector Info
Driver version : 5.15.13
Available Logical Addresses: 4
DRM Connector Info : card 1, connector 32
Physical Address : 1.0.0.0
Logical Address Mask : 0x0010
CEC Version : 2.0
Vendor ID : 0x000c03 (HDMI)
OSD Name : 'Playback'
Logical Addresses : 1 (Allow RC Passthrough)
Logical Address : 4 (Playback Device 1)
Primary Device Type : Playback
Logical Address Type : Playback
All Device Types : Playback
RC TV Profile : None
Device Features :
None
System Information for device 0 (TV) from device 4 (Playback Device
1):
CEC Version : 1.4
Physical Address : 0.0.0.0
Primary Device Type : TV
Vendor ID : 0x080046 (Sony)
OSD Name : 'TV'
Power Status : Standby
Topology:
0.0.0.0: TV
1.0.0.0: Playback Device 1
