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<jakllsch> friedy: is it because it's going via the iommu?
<friedy> Yeah
<jakllsch> does Linux have a DMA KPI that takes that into account?
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<montjoie> hello does someone know instructions to build upstream uboot for rockpi5b ?
<montjoie> I see support for it was merged, but no instructions at all... and I am puzzled that ATF have no rk3588 support
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<robmur01> CounterPillow: coherent buffers are always coherent, i.e. can be accessed by both CPU and device at any time without explicit synchronisation. Whether that is achieved by hardware cache snooping or forcing non-cacheable accesses or whatever is for the DMA API internals to worry about.
<robmur01> As far as drivers should care, they simply set their mask, allocate their buffer(s) and do what they do with them.
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<CounterPillow> Alright, thanks!
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<Kwiboo> montjoie: rk3588 mainline u-boot support is only half baked at this time
<Kwiboo> it needs https://patchwork.ozlabs.org/project/uboot/cover/20230321214301.2590326-1-jonas@kwiboo.se/ to build a bootable u-boot-rockchip.bin image
<Kwiboo> and even more to make it usable
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<Tenkawa> Even once you have mainline u-boot going the mainline kernel support is very nominal for most boards/drivers unless someone has made some major progress in the last week or two..
<Tenkawa> Anyone heard of any significant changes in the last week?
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<CounterPillow> macromorgan: Currently playing around with dsi panels on rk3566, got it to display something but the image starts in the middle of the screen and wraps around. Any experience with this issue? Do I need to adjust timings?