Hi Eugniu, CC cpuidle people On Fri, Jul 26, 2019 at 11:47 AM Eugeniu Rosca <erosca@xxxxxxxxxxxxxx> wrote: > On Fri, Jul 26, 2019 at 11:13:29AM +0200, Rosca, Eugeniu (ADITG/ESM1) wrote: > [..] > > The culprit BSP commits are: > > https://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas-bsp.git/commit/?id=3c3b44c752c4ee > > https://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas-bsp.git/commit/?id=902ff7caa32dc71c > > > > Further narrowing it down, it turns out the CA57 cpuidle support is > > not responsible for generating the issue. It's all about the CA53 idle > > enablement. The reference target is H3-ES2.0-Salvator-X (the problem > > originally emerged on M3-based customer HW). > [..] > > Small amendment to the above (based on vanilla testing): > > Version Issue reproduced? > (H3-ES2.0-Salvator-X) > v5.3-rc1-96-g6789f873ed37 No > v5.3-rc1-96-g6789f873ed37 + [1] No > v5.3-rc1-96-g6789f873ed37 + [2] No > v5.3-rc1-96-g6789f873ed37 + [1] + [2] Yes > > [1] https://patchwork.kernel.org/patch/10769701/ > ("[v2,1/5] arm64: dts: r8a7795: Add cpuidle support for CA57 cores") > > [2] https://patchwork.kernel.org/patch/10769689/ > ("[v2,2/5] arm64: dts: r8a7795: Add cpuidle support for CA53 cores") Thanks for your report and investigation! Unfortunately your original report didn't make it to lore.kernel.org, and probably also not to the list, due to the large audio attachment. For the newly CCed people, the issue is about consistent dropouts during audio playback using an in-house application, introduced by adding cpuidle support to _both_ the big and LITTLE cores. Thanks! Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
