Reverse-Engineered Vivante Driver Brings Improved Performance & Fixes For Linux 6.11

Written by Michael Larabel in Hardware on 30 June 2024 at 06:39 AM EDT. Add A Comment
The Etnaviv kernel graphics driver that provides reverse-engineered open-source support for Vivante graphics (and NPU) IP has seen a fresh round of patches ready to go for queuing in DRM-Next ahead of the Linux 6.11 cycle kicking off in mid-July.

Of the handful of patches for the Etnaviv Direct Rendering Manager (DRM) driver this cycle is one ot keep TS enabled on MMUv2 cores to yield better performance. The change is to not disable the Tile Status (TS) engine on MMUv2 cores when moving the linear window. The patch explains:
"On MMUv2 cores the linear window is only relevant when starting the FE, before the MMU has been activated. Once the MMU is active, all accesses are translated with no way to bypass the MMU via the linear window. Thus TS ignoring the linear window offset is not an issue on cores with MMUv2 present and there is no need to disable TS when we need to move the linear window."

This change should help with improving performance for hardware having newer Vivante graphics IP with MMUv2 cores.

Other Etnaviv work for Linux 6.11 includes fixing NPU clock gating with the NXP i.MX8MP that is also important for performance. There is also a workaround for FE register CDC issues with some Vivante cores, fixing job timeout handling, fixing DMA sync handling, and other fixes.

The full list of Etnaviv driver patches for Linux 6.11 can be found via this pull request.
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Michael Larabel is the principal author of and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 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 automated benchmarking software. He can be followed via Twitter, LinkedIn, or contacted via

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