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