[Bug 97882] [amdgpu SI] amdgpu on SI devices is much slower then radeon

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97882

--- Comment #7 from Trevor Davenport <trevor.davenport at gmail.com> ---
This is fixed by the following commit:


author  Jean Delvare <jdelvare at suse.de> 2017-07-30 08:18:25 (GMT)
committer       Alex Deucher <alexander.deucher at amd.com>        2017-07-31
20:30:42 (GMT)
commit  e5c8d400da67abc1c033b9a4af1806926b55e5f6 (patch)
tree    cf3dac459890ed900416d4087ae0603d4aa42b6f
parent  29805b5f60d88c56ae7e91ae231f0ff8bf1983b8 (diff)

drm/amdgpu: Fix undue fallthroughs in golden registers initialization

As I was staring at the si_init_golden_registers code, I noticed that
the Pitcairn initialization silently falls through the Cape Verde
initialization, and the Oland initialization falls through the Hainan
initialization. However there is no comment stating that this is
intentional, and the radeon driver doesn't have any such fallthrough,
so I suspect this is not supposed to happen.

Commit can be seen here:
https://cgit.freedesktop.org/~agd5f/linux/commit/?h=drm-next-4.14-wip&id=e5c8d400da67abc1c033b9a4af1806926b55e5f6

With this fix I now get performance approximately equal to that of radeon.

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