#linux-sunxi on 2015-04-23 — irc logs at freenode.irclog.whitequark.org

2015-02-18 19:37 Turl changed the topic of #linux-sunxi to: Allwinner/sunxi /development discussion - did you try looking at our wiki? https://linux-sunxi.org - Don't ask to ask. Just ask and wait! - https://github.com/linux-sunxi/ - Logs at http://irclog.whitequark.org/linux-sunxi

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08:42 <alexvf> ssvb: good morning, are you there?

08:43 <ssvb> alexvf: yes, I'm here

08:45 <alexvf> ssvb: i was making tests with dram setings

08:45 <alexvf> but none fixed the sprite shaking issues

08:46 <alexvf> did you try the test program i gave you to try to reproduce it?

08:47 <ssvb> not yet, I haven't been doing anything sunxi related for weeks

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08:48 <alexvf> it's just that i don't know what more can i test, maybe you have some advice

08:48 <alexvf> but i'm starting to lose any hope

08:48 <ssvb> yes, it could be an unresolvable hardware limitation

08:49 <alexvf> since sprites layer can only use DEBE and it seems broken ...

08:50 <ssvb> DEBE in A20 is not too bad, or at least it is better than in A10

08:50 <ssvb> does the sprites layer really use DEBE?

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08:52 <ssvb> if it exhibits different behavior, I wonder if it could be actually using some different host port (neither DEBE, not DEFE)?

08:52 <alexvf> but i don't see any sprite controller host port or anything related that i can tweak

08:52 <alexvf> well, i'm not sure, in the A20 manual it seems a totally different controller

08:54 <alexvf> actually, there are some unused/unknown host ports

08:54 <alexvf> http://rhombus-tech.net/allwinner_a10/A10_register_guide/A10_DRAMC/#index38h2

08:54 <alexvf> could it be one of them which affects sprites?

08:55 <ssvb> yes, the "5.4.2. Display Engine Block Diagram" in the A20 manual seems to show that the sprite controller probably has its own path to memory

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08:56 <ssvb> one of the dram controller host ports could be allocated to the sprite controller

08:56 <alexvf> do you mean one of the undocumented?

08:56 <ssvb> yes

08:56 <alexvf> ok, i will try

08:56 <alexvf> to minimize the unmber of tests

08:57 <alexvf> do you have a magic number that should make it?

08:57 <ssvb> you can try to disable host ports one at a time, to check if one of them breaks the sprite layers

08:57 <alexvf> i was raising and lowering CmdNmb and PrioLevel (even reserved bit)

08:57 <ssvb> just flip the bit 0

08:57 <alexvf> hmm, good idea

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08:59 <alexvf> ssvb: i will come back hopefully today or tomorrow and report any advance, thank you

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09:00 <ssvb> you could probably also ask Allwinner people, maybe they can share some information

09:00 <alexvf> sure, do you have any contact or should i just look for a support email address?

09:01 <ssvb> mripard_ may have some contacts

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09:02 <alexvf> ok, waiting for him to come back to computer :)

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16:05 <mvta> hi there

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16:16 <Skylark> hi me

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18:08 <WarheadsSE> ssvb: ping re: xf86-video-fbturbo-git on Pi2/armv7h building

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