Hi,

On Fri, Jan 26, 2018 at 04:55:54PM +0100, Giulio Benetti wrote:

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It behaves the same way as A20, so as I mean IO polarity,
all signals(except D0-D23), are inverted.
For A33 I've used A33-OLinuXino.
For A20 our LiNova1.

Indeed, HSYNC and VSYNC look inverted.

Yes, so they should be inverted inside the driver.

Yep. And the LCD panels used on our boards as well in order to avoid
any breakages.

Can you provide a list?
Or is there a way I can find it on my own?
I can create a whole patch-set providing this too on panel-simple.c
Ok?

Grepping through the DT, it seems like there's only the A13 q8 tablet
and the SinA33. The former uses simple-panel, the latter a custom
panel driver.

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A little out of thread but:
I'd like to send one for u-boot too,
but this means also to modify every sunxi "sync:3" to "sync:0" and
vice-versa.

What do you think?

That it's going to be a nightmare... We've advertised since the very
beginning something, and we're about to break it. I'm not sure we want
to do that.

I can take care about that.
But I also think that a lot of displays work because they use only DE-mode,
almost ignoring HSync and VSync signals(HV-mode).

In any case I have to produce these patches because of my company's board
based on A20 and A33, and modify defconfig according to it.
The only technical nightmare I see is to produce a commit for every
defconfig to be modified and copy-paste che commit-log substituing board
name(1-2 days of work).
Problem is testing, but we're speaking about something that probably was
badly working, but you couldn't see it on display.
So I think this is only an improvement at the end.

It really is a separate discussion, but you would also need to fix all
the environments everywhere, which is simply not feasible.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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