ITE66121 HDMI driver

[Neil Armstrong]

On 15/02/2021 13:01, Paul Cercueil wrote:
> 
> 
> Le lun. 15 févr. 2021 à 10:05, Neil Armstrong <narmstrong at baylibre.com> a écrit :
>> Hi,
>>
>> On 14/02/2021 00:54, Paul Cercueil wrote:
>>>  Hi Phong and Neil,
>>>
>>>  I see you sent a patchset to support the ITE66121 HDMI transmitter, last version being the V2 back in March 2020.
>>>
>>>  Do you still plan to mainline it?
>>
>> Yes, we still plan to mainline it.
> 
> Ok, great!
> 
>>>
>>>  I do have a device with a ITE66121 chip, so I can help to clean the driver and have it mainlined. But right now I cannot get the driver to work, while the chip is properly detected and correct DDC data is read,, my PC monitor does not detect any signal.
>>
>> Having DDC read working is a good point...
>>
>> Did you check the DPI data setup ? the chip supports dual data rate input, and the last version only supported it via a DT property.
> 
> If "dual data rate" means two pixels per pixclock tick, then my SoC does not support it. I did try both modes though.
> 
> The other thing is that my SoC has no VDE/HDE pins, so (according to the manual) I have to have the chip recreate these signals from videomode information. Which I did, and I get the "video stable" status bit, but I still cannot get anything on screen.

What is the mode you're trying to achieve ?

let me send a v3 with all the comments from v2 fixed and re-start a discussion from this patchset.

Neil

> 
> Cheers,
> -Paul
> 
>