#asahi-dev on 2025-09-06 — irc logs at oftc.catirclogs.org

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08:14 <sven> https://git.kernel.org/pub/scm/linux/kernel/git/sven/linux.git/log/?h=wip/atcphy still has the 5 seconds issue :(

08:14 <sven> happy with that otherwise though

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08:43 <jannau> sven: in the cover letter "Removed most quirks added to dwc3" isn't true if you don't count skip_core_init_mode as quirk but extending the glue layer

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08:44 <sven> true

08:44 <jannau> extending the glue layer should be mentioned in the changelog

08:44 <sven> yeah

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08:46 <sven> i guess i'll remove RFC as well and send this as v2

08:47 <jannau> the devm_kcalloc in the hardware tunable trips me up but it can understand why did it like this

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08:48 <jannau> otherwise looks good to and dropping the RFC seems fine

08:49 <sven> hm, let me take a look at the tunables.c again. it's been so long ago that i don't even remember writing that code

08:53 <jannau> it looks weird. I think more in line with kernel code would be to use a flexible array memeber for values and allocate the whole struct apple_tunable with devm_*alloc

08:53 <sven> yeah, that's what i'm thinking about right now. and then just drop the devm_apple_tunable_free thing entirely

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08:54 <jannau> not sure that that would be a better solution but it would be more aligned with kernel style

08:54 <jannau> if you want to change it I can reply to the patch

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09:14 <sven> yeah, i'm gonna give it a try

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09:26 <nickchan> so... I guess the SARTv1 commit is staying as-is?

09:26 <nickchan> I mean SARTv0

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09:29 <sven> i updated the commit description

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09:46 <jannau> on t602x we need ps_atcN_usb_aon. without it we end up with "dwc3 b02280000.usb: this is not a DesignWare USB3 DRD Core"

09:47 <jannau> maybe related to the omitted fuses on t602x

09:47 <sven> huh, could be

09:48 <sven> or there's some additional init that we're still missing

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09:59 <sven> [ 37.126452] phy-apple-atc 503000000.phy: Pipehandler lock not acked.

09:59 <sven> ugh.. why is that happening again now?!

10:01 <sven> oh, duh, i messed up the tunables and forgot to set -?sz

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10:02 <jannau> we need ps_atcN_usb_aon for dwc3 to survive suspend

10:03 <jannau> at least downstream. on t8103:

10:03 <jannau> dwc3 502280000.usb: DWC3 controller soft reset failed.

10:03 <jannau> dwc3 502280000.usb: failed to reinitialize core

10:03 <jannau> on plug-in after suspend

10:04 <sven> weird

10:04 <sven> but i guess there's some state setup by iboot that needs to survive

10:07 <sven> jannau: do you remember which tree didn't have the 5s delay?

10:09 <sven> https://git.kernel.org/pub/scm/linux/kernel/git/sven/linux.git/commit/?h=wip/atcphy&id=1cf8afff18c8224b150fa458cb5722b079da9b56 i prefer the tunables like this

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10:14 <sven> or alternatively, do you still have a trace_atc.py from a linux tree where we didn't have that 5s delay?

10:17 <sven> also, should i directly add the t6020 compatible?

10:17 <sven> ah nvm, i already added it

10:20 <jannau> sven: no idea about a linux trace without delay. I think the atcphy/2025-experiments* branches don't have the delay. atcphy/2025-experiments_v6.14 would be the most recent

10:20 <sven> okay, i'll try that one after lunch

10:23 <jannau> tunables don't trip "this looks a little weird" anymore

10:23 <sven> yeah, same :)

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10:46 <jannau> sven: pushed DT changes for ps_atc_usb_aon to https://github.com/jannau/linux/commits/wip/atcphy-20250906/

10:47 <sven> ack

10:51 <sven> - reg = <0x3 0x82280000 0x0 0xce00>, <0x3 0x8228ce00 0x0 0x3200>;

10:51 <sven> + reg = <0x3 0x82280000 0x0 0xcd00>, <0x3 0x8228cd00 0x0 0x3200>;

10:51 <sven> 🙃

10:51 <sven> doesn't fix the 5s delay though

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11:08 <jannau> downstream kernel has the same behavior btw. device connected to an usb3 dp-altmode switch are detected without delay

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11:20 <sven> i also see the 5s delay on that experiements branch i think

11:22 <jannau> hmm, I might misremember state then

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11:36 <jannau> I just saw uas errors on shutdown with the downstream kernel so those aren't new / a regression

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11:49 <jannau> I've tagged asahi-6.16.5-1 and pushed to github. rebase and bits/000-devicetree cleanup, another 50+ commits dropped (mostly by squasing but some duplicates or no longer needed changes)

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12:05 <jannau> sven: I certainly used dp-altmode usb3 hub for testing back as well. we probably just didn't realize the 5 second delay is device dependent

12:05 <sven> yeah, that's what i think as well

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12:29 <sven> xnu seems to bring up dwc3 earlier and I Hacker that into Linux and still have the 5s delay :/

12:29 <sven> *hacked

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12:29 <sven> I guess I’ll ignore that for now

12:39 <jannau> +1

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13:24 <sven> just to confirm: if i run make dt_binding_check DT_SCHEMA_FILES=apple,dwc3.yaml and nothing shows up the schema is valid, isn't it?

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13:49 <sven> planning to submit this later as v2: https://git.kernel.org/pub/scm/linux/kernel/git/sven/linux.git/log/?h=wip/atcphy

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15:46 <sven> https://lore.kernel.org/all/20250906-atcphy-6-17-v2-0-52c348623ef6@kernel.org/

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19:55 <mjr23> Hello, I’m learning by writing my own stage-1 loader. Quick question about the boot chain: do I need to worry about RVBAR for stage-1, or is my entry point entirely defined by what I enroll with kmutil? From looking at m1n1:start.S, it seems only the Boot ROM deals with RVBAR.

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