ITE66121 HDMI driver

[Paul Cercueil]

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.

Cheers,
-Paul