SRU:
* https://kernel.ubuntu.com/forgejo/kernel/noble-linux-oem/pulls/221 (oem-6.11)
* https://kernel.ubuntu.com/forgejo/kernel/noble-linux-oem/pulls/182 (oem-6.14)
** Description changed:
+ [SRU Justification]
+
+ [ Impact ]
+
+ amdgpu has functionality that will reset the GPU when a job in a ring
+ buffer times out to try to recover. When this happens, the application
+ submitting the job will crash and there will be a flicker for ~2s while
+ the GPU recovers.
+
+ Proposed fix in v6.15-rc7 as commit
+ 07c9db090b86e5211188e1b351303fbc673378cf ("drm/amdgpu: read back
+ register after written for VCN v4.0.5").
+
+ [ Test Plan ]
+
+ This was originally reported in
https://gitlab.freedesktop.org/mesa/mesa/-/issues/12528. The reproduce steps
are:
+ 1. enabled HW accelerated video decode in Firefox 134 using about:config
+ 2. run video playback streams as stress test for hours.
+
+ [ Where problems could occur ]
+
+ The fix reads back registers to ensure a previous write has completed.
+ No known problem as this moment.
+
+ [ Other Info ]
+
+ While this affects VCN 4.0.5 (AMD Strix Point) and the fix has been
+ committed to v6.15-rc7, nominate for 6.11+ - 6.14 kernels, e.g.
+ linux/oracular, linux-oem-6.11/noble, linux/plucky, linux-
+ oem-6.14/noble.
+
+ ========== original bug report ==========
+
Upstream bug: https://gitlab.freedesktop.org/mesa/mesa/-/issues/12528
amdgpu has functionality that will reset the GPU when a job in a ring
buffer times out to try to recover. When this happens, the application
submitting the job will crash and there will be a flicker for ~2s while
the GPU recovers.
Proposed fix in v6.15-rc7 as commit
07c9db090b86e5211188e1b351303fbc673378cf ("drm/amdgpu: read back
register after written for VCN v4.0.5").
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https://bugs.launchpad.net/bugs/2112582
Title:
HW accelerated video playback causes VCN timeout on VCN 4.0.5 (AMD
Strix)
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