AMDGPU DRM Driver Updates To Work With Production Polaris GPUs
Written by Michael Larabel in Radeon on 21 June 2016 at 10:55 AM EDT. 27 Comments
RADEON --
It looks like some last-minute changes to the Linux kernel are needed for prepping the AMDGPU DRM driver to handle the production Radeon RX 400 "Polaris" graphics cards that will soon be shipping.

This is the first generation of Radeon hardware where open-source support has been worked on publicly prior to launch. With Polaris the initial kernel-side code is coming in Linux 4.7 as the first kernel with the big changes needed to the kernel driver. In user-space you'll need Mesa 12.0+.

While the code has already been mainlined in Linux 4.7, it looks like some changes are needed to this code for supporting the production Polaris GPUs. Alex Deucher of AMD today mailed out "Polaris updates for production silicon" that contain 444 lines of new code and 139 lines of deleted code.

These 12 patches to make the open-source driver work with the Radeon RX 460/470/480 hardware that will begin shipping in the weeks ahead contain fixes to the PolwerPlay code mostly but also some atomBIOS changes, updated golden settings, enabling the clock stretch functionality, and other adjustments. The patches were published this morning on the amd-gfx mailing list.

Since they're all fixes and Polaris hardware isn't even public yet, hopefully this work will all land in Linux 4.7 quite soon. Stay tuned for Polaris Linux benchmarks on Phoronix on launch day.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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