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Intel DRM Driver Gets Support For Multiple Power Wells

Intel

Published on 01 November 2013 02:43 PM EDT
Written by Michael Larabel in Intel
3 Comments

As hopefully a sign that Intel will soon be publishing their open-source graphics driver code for next year's Broadwell platform, new patches emerged today for supporting multiple power wells to be present on "upcoming hardware" out of Intel.

Intel has been working towards Broadwell Linux support but there hasn't been any big code drops yet of Broadwell enablement within the Intel DRM / Mesa / xf86-video-intel. However, today by Intel's Imre Deak were a new set of eight patches implementing support for multiple power wells -- with Haswell there is just one dynamic well. "This patchset adds support for multiple dynamic power wells needed by
future platforms."
HW generations so far had only one always-on power well and optionally one dynamic power well. Upcoming HW gens may have multiple dynamic power wells, so add some infrastructure to support them.

The idea is to keep the existing power domain API used by the rest of the driver and create a mapping between these power domains and the underlying power wells. This mapping can differ from one HW to another but high level driver code doesn't need to know about this. Through the existing get/put API it would just ask for a given power domain and the power domain framework would make sure the relevant power wells get enabled in the right order.

The patch series can be found on intel-gfx.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
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