[Bug 101946] Rebinding AMDGPU causes initialization errors [R9 290 / 4.10 kernel]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101946

--- Comment #10 from Robin <beanow at oscp.info> ---
Created attachment 133101
  --> https://bugs.freedesktop.org/attachment.cgi?id=133101&action=edit
4.13rc2 ubuntu kern.log

Inspecting the output more closely there's a subtle difference in the error
produced.

While the 4.10 kernel produces:

> [  160.013733] [drm:ci_dpm_enable [amdgpu]] *ERROR* ci_start_dpm failed
> [  160.014134] [drm:amdgpu_device_init [amdgpu]] *ERROR* hw_init of IP block <amdgpu_powerplay> failed -22

The 4.13rc2, drm-next-4.14-wip and drm-next-4.14-wip with patch 3 produce:

> [  134.226312] [drm:cik_sdma_ring_test_ring [amdgpu]] *ERROR* amdgpu: ring 9 test failed (0xCAFEDEAD)
> [  134.226822] [drm:amdgpu_device_init [amdgpu]] *ERROR* hw_init of IP block <cik_sdma> failed -22


And something I noticed for the third bind error cases, the 2nd and 3rd time
have much longer ring 1 tests than the first bind.

> [   69.938959] [drm] ring test on 1 succeeded in 2 usecs
> ...
> [  102.040253] [drm] ring test on 1 succeeded in 677 usecs
> ...
> [  134.121468] [drm] ring test on 1 succeeded in 677 usecs

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