Hi, On Thu, Sep 19, 2019 at 11:03:26PM +0300, Roman Stratiienko wrote: > Actually, I beleive this is True solution, and current one is wrong. Let > me explain why. > > De2. 0 was designed to match Android hwcomposer hal requirements IMO. > You can easily agree with this conclusion by comparing Composer HAL and > De2. 0 hardware manuals. > > I faced at least 4 issues when try to run Android using the mainline kernel > sun8i mixer implementation. Current one, missing pixel formats (my previous > patch), missing plane alpha and rotation properties. I plan to fix it and > also send appropriate solution to the upstream. > > To achieve optimal UI performance Android requires at least 4 ui layers to > make screen composition. Current patch enables 4th plane usable. Note that you can also get 4 UI planes by enabling more than one UI layer per channel. You wouldn't be able to use alpha between each plane of a given channel, but we can use a similar trick than what we did for the pipes in the sun4i backend. Maxime
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