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<kjn260>
Hello linux-sunxi community. I have a challenging problem regarding the sunxi-mali-mainline driver and how it relates to framebuffer use
<kjn260>
essentially it would seem that this driver is incompatible with SPI based displays (either realised via the FBTFT lib in staging or TINYDRM )
<kjn260>
so if you want to utilise Mali acceleration and have it work to one of these devices there is no clear solution
<KotCzarny>
fb clone
<kjn260>
in reading the raspberry pi forums, it seems they navigated around this challenge by setting a "virtual" framebuffer allocated to the HDMI port - weather it is used or not
<kjn260>
and then using a script called fbcp to copy this framebuffer to the fbtft or tinydrm display
<KotCzarny>
spi is slow
<kjn260>
I checked this for the screen (320x320px) at 60Mhz spi the setmode reports around 30Hz performance - more than enough for me
<KotCzarny>
at 320x320 you can probably even stick to software 3d
<KotCzarny>
but yeah, would be nice to have a kernel side module for cloning fb
<kjn260>
I tried - the SDL libraries are super slow unaccelerated, my framerate tanks - maybe mali will make an improvement (the suggestion is that it will) but to experiment none the less
<kjn260>
so my board doesn't have a HDMI connector (nanopi neo)
<kjn260>
so do i just force a video mode in uboot to create the framebuffer? from here:
<kjn260>
e.g. setenv video-mode sunxi:320x320-16@50,monitor=hdmi,hpd=0,edid=0
<kjn260>
does this force the kernel to create fb0 with these properties that would link with the Mali GPU? the creation of fb1 for the SPI LCD is trivial
<kjn260>
in "fbdev quirks" it says that CONFIG_DRM_FB_OVERALLOC must be 200 or 300 etc. does this mean I MUST use DRM/KMS? can the framebuffer overallocation be set independently for each framebuffer?
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