[BUG][MTL] - with mtl-008 and main branch FW - video is not smooth with google assistant enabled

[udaymb]

Describe the bug With mtl-008 and main branch FW - video is not smooth with google assistant enabled

To Reproduce

• Boot the chromebook and log in to credentials.
• In Settings, search for “Google assistant”.
• In Google assistant, set “Hey Google/Okay Google” to “On (Recommended)”.
• Retrain the voice to perform voice search.
• Play the video from youtube or Local player.

Reproduction Rate How often does the issue happen ? i.e. 1/10 (once in ten attempts), 1/1000 or all the time. Does the reproduction rate vary with any other configuration or user action, if so please describe and show the new reproduction rate. Always

Expected behavior A clear and concise description of what you expected to happen. Video should run smooth with google assistant enabled

Impact What impact does this issue have on your progress (e.g., annoyance, showstopper) Effects

Environment

1. Branch name and commit hash of the 2 repositories: sof (firmware/topology) and linux (kernel driver).
   • Kernel: {SHA} - https://chromium.googlesource.com/chromiumos/third_party/kernel/+log/refs/heads/release-R123-15786.B-chromeos-6.1 (https://chromium.googlesource.com/chromiumos/third_party/kernel/+/d4f476208c715d8dee7fc7f28134d150f507af6f)
   • SOF: {SHA} - https://github.com/thesofproject/sof/tree/releases/mtl/v8.0 (https://github.com/thesofproject/sof/tree/mtl-008-drop-stable) - top 5 commits aa56343a9612 (tag: releases/mtl/v8.0, origin/mtl-008-drop-stable, 2886ee383d05 multicore: don't enable timer interrupts on secondary cores 8f12c9d8cdcb Revert "idc: zephyr: fix race between IDC p4wq worker and new msg submission" 49af52610d96 app: perf_overlay: disable CONFIG_ADSP_IDLE_CLOCK_GATING d533db7a10a1 west: update zephyr to 2fa282b6cc8b
2. Name of the topology file
   • Topology: {FILE} - Built from above branch with alsatplg version 1.2.11
3. Name of the platform(s) on which the bug is observed.
   • Platform: {PLATFORM} - MTL

Screenshots or console output If applicable, add a screenshot (drag-and-drop an image), or console logs (cut-and-paste text and put a code fence (```) before and after, to help explain the issue. dmesg-mtl-008-video-issue.log mtrace-mtl-008-video-issue.log

Please also include the relevant sections from the firmware log and kernel log in the report (and attach the full logs for complete reference). Kernel log is taken from dmesg and firmware log from sof-logger. See https://thesofproject.github.io/latest/developer_guides/debugability/logger/index.html

NOTE THAT Reverting below patch has resolved the issue https://github.com/thesofproject/sof/commit/08cf3d2232e4

[abonislawski]

@RanderWang @kv2019i https://github.com/thesofproject/sof/commit/08cf3d2232e4 revert helps here so basically delay to start host dma helps here and we need driver team help to understand why host delay is required and if this can be resolved another way in driver?

FYI @lgirdwood @plbossart

[kv2019i]

@udaymb This is probably same rootcause as https://github.com/thesofproject/linux/issues/4781 -- there's a kernel PR available from @ujfalusi

[udaymb]

@kv2019i - @ujfalusi and @abonislawski suggested to use https://github.com/thesofproject/linux/pull/4851 As the kernel used is - https://chromium.googlesource.com/chromiumos/third_party/kernel/+log/refs/heads/release-R123-15786.B-chromeos-6.1 (https://chromium.googlesource.com/chromiumos/third_party/kernel/+/d4f476208c715d8dee7fc7f28134d150f507af6f) patches cannot be directly applied from the PR - manual changes are done as attached - mtl-6.1-kernel-pr-4851-backport.zip

With this issue is NOT observed dmesg-pr-4851-backport-6.1-24ww113.log mtrace-pr-4851-backport-6.1-24ww113.log

[abonislawski]

Fixed in https://github.com/thesofproject/linux/pull/4851

• v8.0.1 opt-in release for older kernel versions, otherwise v8.0 still recommended @udaymb please close if all is good