Hello Sam,
On 2/1/19 22:37, Sam Ravnborg wrote:
> The problem with the RED/BLUE lines swapped is something I
> have encountered while working with DRM support for Atmel at91sam9263 too.
>
> The solution selected is to extend the endpoint with
> a new optional property:
>
> - wiring: Wiring of data lines to display.
> "straight" - normal wiring.
> "red-blue-reversed" - red and blue lines reversed.
>
> (media/video-interfaces.txt)
>
>
> The DT node looks like this:
>
> port@0 {
> reg = <0>;
> #address-cells = <1>;
> #size-cells = <0>;
> lcdc_panel_output: endpoint@0 {
> reg = <0>;
> wiring = "red-blue-reversed";
> remote-endpoint = <&panel_input>;
> };
> };
>
> This allows us to specify the swapping in the endpoint and
> not in the panel.
> So we can use the same panel, with the same bus_format, in several
> designs some with red-blue swapped (reversed), and some not.
A colleague suggested a property in the endpoint as well, but I shied
away because of the extra hassle. Seems there's won't be a way around it ^^'..
How do you intend to propagate this different wiring setting?
How about having drm_of_find_panel_or_bridge adjust the
(*panel)->connector->display_info.bus_formats array to account for the
different wiring? That way there shouldn't be any need to adjust drivers.
>
> This above is inspired by some earlier thread on dri-devel.
> I recall Peter Rosin was one of the main source of inspiration.
Thanks for the interesting read.
>
> Patches I refer to are not yet posted, this is work-in-progess.
> They need more polishing and testing before they are dri-devel ready
Cheers
Ahmad
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