[Bug 97494] Tonga vce perf regression since drm/amdgpu: add vce bypass mode for tonga.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97494

            Bug ID: 97494
           Summary: Tonga vce perf regression since drm/amdgpu: add vce
                    bypass mode for tonga.
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: adf.lists at gmail.com

R9285 agd5f drm-next-4.9-wip since 

commit c04399f19436616875879ee2711c5b78a90dd1b0
Author: Rex Zhu <Rex.Zhu at amd.com>
Date:   Thu Aug 18 18:27:14 2016 +0800

    drm/amdgpu: add vce bypass mode for tonga.

    fix issue that encode test failed on the second time when
    vce dpm enabled on tonga.

vce clocks seem stuck low, forcing gpu perf to high doesn't help.

500 frames 2160p nv12 from/to ram.

omx 8 seconds -> 35

vaapi 12 seconds -> 51

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