[Bug 109790] [ 11.594966] [drm:r600_ring_test [radeon]] *ERROR* radeon: ring 0 test failed (scratch(0x850C)=0xCAFEDEAD)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109790

--- Comment #3 from Alex Deucher <alexdeucher at gmail.com> ---
(In reply to baopeng from comment #0)
> Created attachment 143482 [details]
> error_dmesg
> 
> We enabled the Radeon OLAND series of graphics cards on ARM, very old
> graphics cards,
> The kernel is a 4.14 kernel and there is a problem with GPU acceleration not
> being enabled:
> The kernel initialization log is as follows, there are 2 errors, one is
> radeon 0000:43:00.0: failed VCE resume (-110).

This one is harmless.

> One is [drm:r600_ring_test [radeon]] *ERROR* radeon: ring 0 test failed
> (scratch(0x850C)=0xCAFEDEAD), this error causes the GPU acceleration
> function to be turned off.
> Can you ask me what it is, or how to position it next?

For this one, make sure you have this patch:
https://cgit.freedesktop.org/drm/drm/commit/?id=e02f5c1bb2283cfcee68f2f0feddcc06150f13aa
and also make sure your ARM platform supports cache coherence as required by
the PCI spec.

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