#linux-rockchip on 2021-03-22 — irc logs at freenode.irclog.whitequark.org

2017-05-08 04:47 ChanServ changed the topic of #linux-rockchip to: Rockchip development discussion | IRC log http://irclog.whitequark.org/linux-rockchip | Community GH https://github.com/linux-rockchip | Rockchip GH https://github.com/rockchip-linux | ML https://groups.google.com/group/linux-rockchip

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01:51 <cp-> unrelated to Rockchip (??:)) but I'll just leave this here for pondering by some: https://twitter.com/_markel___/status/1373059797155778562

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10:47 <robmur01> manawyrm: I believe the display controller (VOP) itself can only do 180 degree rotation (by reversing both axes). The RGA can apparently rotate buffers in 90 degree increments, but isn't part of the display pipeline :(

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16:15 <mmind00> robmur01: also it was determined that rga has certain flaws in terms of performance that makes it unsuitable for actual display work

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16:37 <macc24> mmind00: ???

16:37 <macc24> everyone with a linux distro for odroid go advance/super uses rga to rotate the display

16:39 <mmind00> macc24: https://lwn.net/Articles/729290/

16:39 <mmind00> "Rockchip RGA have a limited MMU, which means it can only hold several buffers in the same time.

16:39 <mmind00> When it was used in compositor, it will waste a lot of time to import/export/flush buffer, resulting in a bad performance"

16:39 <macc24> ohh yeah that makes sense

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