On 05/30/17 09:21, Neil Armstrong wrote: > Hi Hans, > > On 05/30/2017 08:53 AM, Hans Verkuil wrote: >> For those who are interested in HDMI CEC support I made a little status >> document that I intend to keep up to date: >> >> https://hverkuil.home.xs4all.nl/cec-status.txt >> >> My goal is to get CEC supported for any mainlined HDMI driver where the hardware >> supports CEC. >> >> If anyone is working on a CEC driver that I don't know already about, just drop >> me an email so I can update the status. >> >> I also started maintaining a list of DisplayPort to HDMI adapters that support >> CEC. If you have one that works and is not on the list, then please let me know. >> Seeing /dev/cecX is not enough, some adapters do not connect the CEC pin, so they >> won't be able to detect any other CEC devices. See the test instructions in the >> cec-status.txt file on how to make sure the adapter has a working CEC pin. I >> plan to do some more testing this week, so hopefully the list will expand. >> >> Thanks! >> >> Hans > > Following our discussion on IRC, > I'm working on a CEC driver for the standalone Amlogic CEC Controller that is able > to wake up the device from Suspend or Power Off mode by passing infos to the FW. FYI: the Pulse Eight linux driver has similar support. It has to be enabled via a module option (persistent_config=1). I have no public API for this, mostly because I would first like to get more information about how these things are typically implemented in hardware. Regards, Hans > I initially planned to use the DW-HDMI CEC controller but I recently found out that > on the Amlogic Meson GX SoCs, the CEC line can be pinmuxed to either an Amlogic custom > controller or either to a Synopsys IP. > > But it's connected to the Synopsys HDMI-RX controller... so my plan to use Russell's code > is now dead. > > Anyway, I'll still need to have the CEC notifier suport for DW-HDMI, so I made a rebase/cleanup > of Russell's driver on 4.12-rc3 : > https://github.com/superna9999/linux/commits/amlogic/v4.12/rmk-dw-hdmi-cec > The rebase is aligned on dw-hdmi-i2s to use the bridge read/write ops. > > Neil >
