AMDGPU PowerPlay Code Gets Readied For Linux 4.5
Written by Michael Larabel in Radeon on 22 December 2015 at 05:29 PM EST. 1 Comment
RADEON --
Alex Deucher has been tidying up his drm-next-4.5 branch for merging the Radeon and AMDGPU DRM driver changes into DRM-Next.

Since yesterday, all of the AMDGPU PowerPlay support code is present in drm-next-4.5, which means it should land for Linux 4.5 with this being the branch that Alex will submit to David Airlie for DRM-Next, and then within a few weeks once the Linux 4.5 merge window is open will hit the mainline tree.

The PowerPlay support code for AMDGPU allows the discrete GPUs supported by this newer DRM driver to properly re-clock to their maximum power state along with other power management related features. This code for Linux 4.5 will finally allow the R9 285 "Tonga", R9 Fury "Fiji", and future AMD graphics processors to run at their rated speeds to better compete with the Catalyst driver.

Last month I published some preliminary AMDGPU PowerPlay results while tomorrow or Thursday I should have some fresh end-of-year AMDGPU benchmarks completed with this drm-next-4.5 code paired with LLVM 3.8 SVN and Mesa 11.2-devel.

You can dig through Alex's drm-next-4.5 branch for now here while likely soon he'll issue the pull request to get it in DRM-Next. Stay tuned for more Linux 4.5 details as the 4.4 kernel release gets closer.
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