[Mesa-dev] Android + tegra + mesa

[Thierry Reding]

On Fri, Jan 18, 2019 at 01:26:30PM +0300, Artyom Bambalov wrote:
>     Do you have some notes on how to reproduce your setup? I've been meaning
>     to try this out but never found enough time to see it through. Having a
>     set of simple instructions for getting this built and booted would help
>     reproduce the behavior and debug.
> 
> My device is xiaomi mipad 1(codename is mocha). It's similar with with
> shieldtablet(tn8), but uses different lcd panel, pmic(tps65913 like in t114
> instead of as3xxx) and some other secondary hardware. 
> My device tree(lineage-16.0 branch): https://github.com/arttttt/
> android_device_xiaomi_mocha_mainline
> My kernel(android-4.19_mocha-changes branch): https://github.com/Insei/linux
> 
> 
> 
>     That said, it looks like you've got a completely white display, which
>     usually means that you're getting page faults from the SMMU, so maybe
>     that'd be an interesting place to look at. You should be seeing errors
>     from the SMMU in the kernel log in that case.
> 
> The display can be white or black. It depends on real picture color. 
> 
> 
> 
>     There was a brief period where the SMMU wasn't working properly with
>     Nouveau, which could be related to this, especially since it was around
>     the timeframe of 4.19. That issue was fixed with this commit:
> 
>             b59fb482b522 ("drm/nouveau: tegra: Detach from ARM DMA/IOMMU
>     mapping")
> 
>     which was merged into v4.19, but maybe it's not in the tree from Google
>     that you're using (for whatever reason).
> 
>     Come to think of it, that wouldn't really explain the white display,
>     though, since that usually happens on SMMU faults for reads by the
>     display controller. In any case, the kernel log would hopefully contain
>     some clues as to what could be wrong.
> 
>     Thierry
> 
> 
> I attached dmesg. It contains pretty much nouveau errors. 
[...]
> [  202.341300] nouveau 57000000.gpu: gr: DATA_ERROR 0000009c [] ch 6 [0400441000 RenderThread[924]] subc 0 class a297 mthd 0d78 data 00000004
> [  202.341332] nouveau 57000000.gpu: gr: DATA_ERROR 0000009c [] ch 6 [0400441000 RenderThread[924]] subc 0 class a297 mthd 0d78 data 00000004
> [  202.341359] nouveau 57000000.gpu: gr: DATA_ERROR 0000009c [] ch 6 [0400441000 RenderThread[924]] subc 0 class a297 mthd 0d78 data 00000004
> [  202.341383] nouveau 57000000.gpu: gr: DATA_ERROR 0000009c [] ch 6 [0400441000 RenderThread[924]] subc 0 class a297 mthd 17e0 data 0000001e
> [  202.341418] nouveau 57000000.gpu: gr: DATA_ERROR 0000009c [] ch 6 [0400441000 RenderThread[924]] subc 0 class a297 mthd 0d78 data 00000004
> [  202.341453] nouveau 57000000.gpu: gr: DATA_ERROR 0000009c [] ch 6 [0400441000 RenderThread[924]] subc 0 class a297 mthd 0d78 data 00000004
> [  202.341476] nouveau 57000000.gpu: gr: DATA_ERROR 0000009c [] ch 6 [0400441000 RenderThread[924]] subc 0 class a297 mthd 0d78 data 00000004
> [  202.341499] nouveau 57000000.gpu: gr: DATA_ERROR 0000009c [] ch 6 [0400441000 RenderThread[924]] subc 0 class a297 mthd 17e0 data 0000001e
> [  202.415128] nouveau 57000000.gpu: gr: DATA_ERROR 0000009c [] ch 6 [0400441000 RenderThread[924]] subc 0 class a297 mthd 0d78 data 00000004
> [  202.415162] nouveau 57000000.gpu: gr: DATA_ERROR 0000009c [] ch 6 [0400441000 RenderThread[924]] subc 0 class a297 mthd 0d78 data 00000004
> [  202.415188] nouveau 57000000.gpu: gr: DATA_ERROR 0000009c [] ch 6 [0400441000 RenderThread[924]] subc 0 class a297 mthd 0d78 data 00000004
> [  202.415213] nouveau 57000000.gpu: gr: DATA_ERROR 0000009c [] ch 6 [0400441000 RenderThread[924]] subc 0 class a297 mthd 17e0 data 0000001e

These errors certainly look like something's wrong with the IOMMU. Can
you post the contents of this:

	$ ls -l /sys/class/iommu/70019000.memory-controller/devices

from your system?

Thierry
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