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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<Strontium> anyone know the way to change the video mode being used by a drm driver?
<Strontium> fbset doesnt seem to do anything inteligent
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<lucascastro> hello
<lucascastro> I'm trying to use the sunxi-mali driver, on banana pi running debian.
<lucascastro> I'm using https://github.com/mripard/sunxi-mali/ this source. But I'm getting an error when trying to load the module.
<lucascastro> dmesg show me -> Couldn't set clock defaults
<lucascastro> does someone already faced against that and/or know anything about that?
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<diego71> lucascastro: just guessing: do you have the right dtb?
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<oliv3r> Hey, is.there any way to get displays driven with our 2d/3d stack other then the available rgb/tcon? I.e. can ibdrive an SPI diaplay for example?
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<wens> how many fps can you get with an SPI display?
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<diego71> wens: depends on the resolution. Usually not more than a vga.
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<KotCzarny> yeah, it's slow
<KotCzarny> good for low-refresh info display, photo frames etc
<KotCzarny> not good for anything >10-15fps
<Strontium> wens: the limit is the spi controller in the lcd display. For example, i am using a display with a ILI9488. Specifies a maximum spi clock cycle of 50ns. (Thats 20Mhz)
<Strontium> wens: its a 480x320 display and needs 24 bits of data per pixel in spi mode.
<Strontium> wens: so 20,000,000 / 24 / 480 / 320 = Maximum frame rate (according to specs) = 5.4 frames per second.
<Strontium> wens: however, many people have success running with higher clocks than specified, but even if you can double it, you will only get < 11 frames per second.
<Strontium> You can do the same calculations for any spi panel.
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<Strontium> the SPI in the socs from sunxi can run up to 100Mhz (i believe) so in theory that panel could do 27 frames per second, but the controller on the lcd can't handle it. The limit with these displays is always the lcd controller, when using a soc like the allwinner ones, or the raspberry pi.
<Strontium> oliv3r: in theory if you use fbtft or tinydrm you should be able to use a spi lcd like a normal screen (just with a low refresh rate)
<KotCzarny> i was running linux console via fbtft on 128x64
<KotCzarny> works, but not much screen estate ;)
<Strontium> KotCzarny: yes, but for a status screen, or a specific application could be plenty. but console, yeah not very useful.
<KotCzarny> still fun
<Strontium> i have a plan for a spi tft that can run with a spi clock up to 150mhz using a tiny fpga to do serial to parallel conversion.
<KotCzarny> why not just use some proper display connector?
<Strontium> KotCzarny: not always available.
<Strontium> especially for small size screens (sub 4")
<KotCzarny> spi2hdmi? :>
<Strontium> spi2mipi dbi type B :)
<Strontium> the logic is very very simple and the fpga is very cheap ($2)
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<JohnDoe_71Rus> KotCzarny: the magic :)
<KotCzarny> actually magic was pixels organization in the display
<KotCzarny> and fixed organization of the same image: https://imgur.com/GJTwEz6
<Strontium> KotCzarny: nice.
<Strontium> my next job with this opi zero is to get these sample lcd boards going. i will probably uses fbtft, shouldn't be too difficult.
<KotCzarny> other than that, fbconsole take care of the linux side
<KotCzarny> strontium: yeah, easy work, most are already supported
<KotCzarny> i had to hack that particular one because i needed to use legacy kernel and got knock-off from aliexpress
<Strontium> tinydrm looks nice, pitty is it doesn't support many lcd's at all (1 or 2)
<Strontium> well, i think this H3/TVE patch for the armbian mainline kernel is working about as good as i can do. i will clean it up and post it later if anyone is interested.
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<JohnDoe_71Rus> https://i.imgur.com/PrIc0ci.jpg https://i.imgur.com/SiPxPny.jpg magic too. dvi-hdmi converter
<KotCzarny> mm, pink
<JohnDoe_71Rus> red
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<KotCzarny> depends ondisplay
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<oliv3r> Im currently.lokoking at very low resolution screens. Think 128x128 for.example
<oliv3r> And planning of writing the timydrm.driver dor it. But wanted to know if it is possible at all before spending.time.on iy
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<lucascastro> diego71: I'm wondering the same question, I had made some checky-pick for my dts to bananapi gpu
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<JohnDoe_71Rus> oliv3r: 128x128 screens use spi or some like. control like arduino
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<lucascastro> can someone say me if the irq setup for mali gpu on sun7i-a20 at that link is right?
<lucascastro> or how can I get that information to check?
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<Strontium> if anyone is interested in the patch or a working image: https://github.com/stevenj/h3-tve/releases/tag/v0.0.11
<Strontium> all credit goes to icenowy[m], i just got it to apply cleanly to armbian mainline and work out why it wasn't showing an image.
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<pgreco> I'm using a bananapi-m1, with plain fedora workstation
<pgreco> kernel 4.15 brings up graphics without problems
<pgreco> 4.16rc2(which includes many of the other a20) doesn't, X keeps crashing
<pgreco> once I apply that patch to the dtb, boots ok without any other change
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<oliv3r> yeah small info.screen, but want to drive it via our sun4i 2d/3d engones
<buZz> finally, have working PAL out of a CHIP :)
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<plaes> oliv3r: tinydrm is totally separate of sun4i
<plaes> it's just spi
<oliv3r> tinydrm is 'whatever you want ' :p
<oliv3r> the initial question was, can i use a sSPI display as a sunxi output. as all the videomemory is in RAM in theory it should be possible :)
<plaes> I actually got fbtft working on cubietruck a while ago...
<plaes> before it was superceded by tinydrm
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<oliv3r> yeah but i want to use the sunxi 2d and 3d engines (well 3d when lima gets somewhere)
<oliv3r> so was just curious if we can take the pixel data and push it out via SPI
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<buZz> https://imgur.com/a/G1aNo <-- yay :) 'CHIP' running pico-8 on a CRT
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