Hi Martin,
Le 24 mars 2018 à 12:00, Martin Blumenstingl martin.blumenstingl@googlemail.com a écrit :
Hello Hans, Hi Neil,
(apologies in advance if any of this is wrong, I don't have any CEC capable TV so I can't test it)
On Fri, Mar 23, 2018 at 1:59 PM, Hans Verkuil hverkuil@xs4all.nl wrote:
From: Hans Verkuil hans.verkuil@cisco.com
Some boards (amlogic) have two CEC controllers: the DesignWare controller and their own CEC controller (meson ao-cec).
as far as I understand the Amlogic Meson SoCs have two domains:
- AO (always-on, powered even in suspend mode) where meson-ao-cec can
wake up the system from suspend
- EE (everything else, not powered during suspend) where dw-hdmi-cec lives
Exact, except … the EE CEC is not hooked to the DW-HDMI TX but the RX, and thus cannot be used on GXBB/GXL/GXM.
this far everything is OK
Since the CEC line is not hooked up to the DW controller we need a way to disable that controller. This patch series adds the cec-disable property for that purpose.
drivers/pinctrl/meson/pinctrl-meson-gxbb.c has ao_cec_pins and ee_cec_pins, both use GPIOAO_12 drivers/pinctrl/meson/pinctrl-meson-gxl.c has ao_cec_pins and ee_cec_pins, both use GPIOAO_8
@Neil: do you know if the CEC signal routing is: ao_cec_pins -> meson-ao-cec ee_cec_pins -> dw-hdmi-cec
It’s hooked to the DW-HDMI RX IP used in the TV SoCs.
I'm curious because if both CEC controllers can be used then it might be worth mentioning this in the cover-letter and patch description
Initially I thought it was hooked to the DW-HDMI TX, but no, I guess I should remove the ee_cec pinmux…
Neil
Regards Martin