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11:46 <lumag> Marijn[m], konradybcio: do you know if anybody tried using PSCI_DOMAIN idle states on 8994/8998?

11:52 <lumag> This boils down to the question whether OSI is supported on them or not.

11:57 <lumag> and the same question goes to the sdm630/660

12:00 <lumag> kholk[m], ^^

17:37 <aka_[m]> <lumag> "This boils down to the question..." <- can linux determine that?

17:37 <aka_[m]> on 8976 there is something like that in log:

17:37 <aka_[m]> psci: OSI mode supported.

17:50 <lumag> aka_[m], do you have CONFIG_PSCI_DOMAINS on?

17:52 <aka_[m]> not even config_psci enabled it appears

18:04 <lumag> aka_[m], then if you don't see dmesg errors from CPUidle or PSCI, then OSI is supported

18:04 <lumag> and psci_domains should work as expected

18:07 <aka_[m]> there is

18:07 <aka_[m]> but i bet i haven't configured it well

18:07 <aka_[m]> CPUidle PSCI: failed to enable OSI mode: -95

18:08 <lumag> aka_[m], ah, so it means that it also doesn't want the CPU_SUSPEND.

18:08 <lumag> Let me send the debugging patch...

18:11 <aka_[m]> at first glance 8953 also fails with same error

18:23 <lumag> aka_[m], https://lore.kernel.org/linux-arm-kernel/20220727182034.983727-1-dmitry.baryshkov@linaro.org/T/#u

18:23 <lumag> could you please check with this patch if/when you have time.

18:24 <aka_[m]> that might take a lot of time, maybe once i dig into 8976 once again.

19:00 <lumag> aka_[m], n/p

19:00 <lumag> I'm trying to understand, how common is this firmware issue

19:17 <Mis012[m]> the real firmware issue is that secure boot fuses are provisioned by someone other than the end user on most devices

19:17 <Mis012[m]> every other firmware issue could be solved if one could change the fw...

20:22 <konradybcio> lumag: 8994 psci is broken at best, i don't have high hopes

20:22 <konradybcio> that said i don't think anybody tried

20:22 <konradybcio> 8998.. i don't think anybody tried but i'd be surprised if it didn't work there

20:27 <lumag> konradybcio, what is broken with 8994 (just curious)?

20:27 <konradybcio> what isn't..

20:27 <konradybcio> psci is partially implemented on some fws and not implemented on others

20:27 <lumag> For the 8998 the question is about the OSI vs SET_SUSPEND_MODE support

20:27 <konradybcio> it's barely good enough to start secondary cores

20:27 <konradybcio> IIRC somebody said it can't even shut them down

20:27 <konradybcio> on xperias, no psci at all on 8994

20:28 <lumag> I see.

20:28 <lumag> So they must use SPM, which is forbidden for arm64?

20:28 <konradybcio> bingo

20:29 <konradybcio> and you can't implement psci-hvc because qHYP

20:29 <konradybcio> there is however an exploit that lets you take over hypervisor

20:29 <konradybcio> but sony patched it out even on pre-release-reviewers-journalists fw