ITE66121 HDMI driver

[Paul Cercueil]

Le lun. 15 févr. 2021 à 14:39, Neil Armstrong 
<narmstrong at baylibre.com> a écrit :
> 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 ?

For now 720p in single data rate, RGB888, with VSYNC/HSYNC available 
but no DE.

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

Alright, please Cc me for the V3.

Cheers,
-Paul