#asahi-dev on 2025-04-06 — irc logs at oftc.irclog.whitequark.org

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04:46 <chadmed> interesting development in the wireplumber space: apparently someone else has found a use for the DSP chain stuff we built and george and arun want to hack on it at the pw hackfest

04:46 <chadmed> i wish i could attend

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10:46 <sven> mischa85: uh, no. the point is to make wfi last longer but right now the core seems to exit that state pretty quickly again

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10:51 <sven> there's probably still some event firing in the background, maybe some timer

10:53 <sven> if there's the HW magic that decides between retention/non-retention it will probably only move to non-retention if nothing happened for a longer time

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11:00 <chaos_princess> isn't the event literally the read64 in the next line that causes proxyclient to write to serial?

11:05 <sven> I don’t think we use interrupts for usb

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11:06 <sven> or wait.. do we these days?

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11:10 <nickchan> sven: i think interrupts are not used

11:10 <mischa85> sven: yes, i realized. so this is why this experiment will need to be done on another cpu and doesn't work with only the boot cpu

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11:10 <mischa85> i can only say, the output is consistent

11:11 <mischa85> the timer idea would probably work to fire an interrupt but only with smp working

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11:13 <sven> why do you need another cpu?

11:13 <mischa85> to actually run the timer

11:14 <sven> i'm talking about the hardware timer

11:14 <sven> we use that in the hv as well

11:14 <sven> you can configure it to just trigger an interrupt which will wake you from wfi

11:15 <sven> but first you need to figure out what currently causes wfi to terminate

11:15 <mischa85> which was my first approach but the aic timer crashes as it's probably not enabled via pmgr

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11:20 <nickchan> mischa85: i do not think there is a timer in aic on 64-bit apple soc

11:21 <mischa85> it's defined in the adt tho

11:21 <mischa85> 0x302580000

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11:23 <nickchan> mischa85: can you not use the cpu register timers?

11:24 <nickchan> they should be standard ARM stuffs

11:24 <nickchan> and the interrupt of that timer is delivered as a FIQ

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11:26 <mischa85> but how can i poll that timer without causing an interrupt? maybe i'm just unsure here how to implement that

11:27 <nickchan> mischa85: you need an interrupt to wake from wfi...

11:28 <nickchan> as for polling the timer without causing interrupt that's what udelay() does already

11:32 <chadmed> mischa85: udelay implements a "timer" by just counting CNTPCT_EL0 ticks so you can use that i suppose

11:32 <chadmed> it's exposed to python

11:32 <nickchan> But that's the opposite of what one wants to do in a wfi experiments

11:32 <nickchan> it keeps the cpu busy

11:32 <nickchan> and other cores are not working so everything needs to happen on the boot cpu

11:33 <chadmed> yeah so we're stuck

11:33 <nickchan> configure the timer register to fire an interrupt after a second then call a function that does deep wfi

11:33 <sven> ^-- that

11:34 <sven> but first we need to figure out why wfi returns currently

11:36 <nickchan> and that function should write a magic value into x0, save x19-x30, wfi, restore x19-x30, then return

11:36 <nickchan> and x0 will end up being the return value so check that from the caller

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17:26 <sven> mischa85: when you tried to start the other cores did you do that with the m1n1 on disk or did you do a chainload to an updated m1n1 inbetween?

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17:36 <mischa85> m1n1 on disk

17:37 <sven> ok, that should've worked with the locked iorvbar values we checked earlier

17:37 <sven> pity. i was hoping there was a chainload inbetween and the only issue was that m1n1_base changed

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