ChanServ changed the topic of #asahi-dev to: Asahi Linux: porting Linux to Apple Silicon macs | Non-development talk: #asahi | General development | GitHub: https://alx.sh/g | Wiki: https://alx.sh/w | Logs: https://alx.sh/l/asahi-dev
<amarioguy>
btw is pmc0 always the cpu cycle register?
<amarioguy>
the asahi docs are slightly unclear on this
<jannau>
amarioguy: pmc 0 and 1 are hardcoded to cycles and instructions
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<j`ey>
t8110 dart support was applied by joerg, yay, 7 fewer patches in bits/020-t6000-dart
<jannau>
probably to late for t8110 device trees
<chadmed_>
j`ey: the patch number actually went down for the first time ever with 6.2 :P
<j`ey>
:o
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<jannau>
sven: dp-altmode works even when connected on boot, only the hotplug event is missing in that case. altmodes/displayport.c doesn't issue that if HPD is set during configuration
<sven>
yeah, that's a probe dependency issue
<sven>
compare how e.g. usb-role-switch or the typec-mux works to how that OOB event works
<sven>
if you manage to have dcp up and running before tipd it'll work even when connected during boot iirc
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<jannau>
no, the problem I see is that dp_altmode_status_update() is only called once. it set dp altmode up then and never genereates a hotplug event
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<sven>
huh, true. never saw that here though
<sven>
I vaguely remember making it working during boot by adding a sleep somewhere in tipd
<sven>
and I thought I tracked that down to the probe dependency order
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<jannau>
I'm currently using my dcp tree with component based probing, i.e. without deferred probing so it should be up earlier
<jannau>
I don't remember if the port links have an influence on probe order but if they do it might be stable now
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<amarioguy>
jannau: gotcha thanks
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<sven>
ping over thunderbolt with dma. for some reason there's a pretty high latency though:
<sven>
# ping google.de
<sven>
PING google.de (142.250.185.195) 56(84) bytes of data.
<sven>
64 bytes from fra16s52-in-f3.1e100.net (142.250.185.195): icmp_seq=1 ttl=115 time=141 ms
<sven>
my internet is sometimes pretty bad but it's not _that_ bad :D
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<jannau>
yeah! so 80ms for the first meter and 60ms for the remaining kilometers
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<maz>
feels like interrupt latency, not DMA.
<maz>
are you doing MSIs? or INTx?
<sven>
MSIs
<sven>
the dma comment was just to say that the iommu finally works, I'm not sure what exactly causes that latency
<maz>
right. it could be that the MSI write is buffered somewhere. can you configure the memory type for the MSI mapping?
<sven>
I wouldn't know how
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<sven>
well... maybe I'm just gonna blame Broadcom for this
<sven>
64 bytes from fra24s04-in-f3.1e100.net (142.250.186.35): icmp_seq=2 ttl=115 time=17.0 ms
<sven>
that's via a USB adapter via my old apple thunderbolt display
<sven>
which also completely breaks bus rescanning. I had to rescan like 5 times before everything was up :/
<sven>
I need to figure out how to that properly
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<mkurz>
jannau: sven: Just curious: HDMI Out does work on the Mac Mini according to the wiki. the the MacBooks its WIP. Does it depend on some other stuff to make it work?
<chadmed_>
mkurz: the hdmi port on the laptops is actually a displayport on an atcphy
<chadmed_>
theres a dp to hdmi chip on the board
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<maz>
sven: do you get similarly high latency with local communication?
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<mkurz>
chadmed_: understand. Hmm.. Not sure if I understand everything correct, but is it possible to connect an external monitor or beamer to the macbook? The wiki says DCP does work in the asahi-edge kernel? Or maybe I just don't get it
<mkurz>
chadmed: And if I understand correct DCP is needed for displayport to work?
<maz>
I wonder if there is some aggressive PM going on on the TB side that would delay something...
<chadmed_>
DCP works, but the code to route a dp signal from it to the type-c phy is not yet in the kernel
<mkurz>
chadmed_: You mean the asahi-edge kernel?
<chadmed_>
DCP is just the display controller, theres a whole ballet dance that needs to happen between it, the DP routing circuitry, the usb-c mux chip, the ATCPHY...
<sven>
maz: I figured out the latency issues, it was mostly me being dumb. I had to enable some quirks I didn't understand in tg3 to make the adapter work. one of them replaced every single register access with an indirect one through config space
<chadmed_>
yes, DCP is not the only thing involved here
<sven>
the bigger issue is that everything in that tg3 bar reads back as 0xffffffff
<sven>
(tg3 is the 15000+ lines broadcom driver)
<mkurz>
chadmed_: OK, got it. So currently it is not possible to connect a external display/beamer?
<chadmed_>
no, hence why HDMI Out on the feature page is WIP
<mkurz>
chadmed_: Sad :(
<maz>
sven: tg3 is a horrible driver (to be fair, most bcm drivers are like that). the -1 returns are pretty worrying though.
<sven>
yeah, it sounds like something is still a bit broken. no idea what exactly though
<chadmed_>
mkurz: itll get there soon enough, better to release something that works reliably than a hacky janky mess
<sven>
it only happens with that bcm device so far
<sven>
the ohci/ehci controllers in this old thunderbolt display work fine e.g.
<maz>
makes you wonder what sort of glue they used to put this contraption together...
<sven>
I don't think I want to know ;)
<mkurz>
chadmed_: Sure! Looking forward to it! I am very happy with Asahi already!
<sven>
I think I'm just missing some magic poke somewhere. the adapter works fine under macos
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<kettenis_>
sven: what thunderbolt ethernet is that? the apple one?
<sven>
yes
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<sven>
it uses the same chip as the internal one
<kettenis_>
heh, so I have the same stack of dongles here now
<kettenis_>
but no thunderbolt support in openbsd yet of course
<sven>
does openbsd already have support for the "normal" Thunderbolt NHI?
<kettenis_>
nope; but it nevertheless works on my x9
<kettenis_>
guess the firmware handles everything there
<kettenis_>
s/x9/x1/
<sven>
yeah, there are firmware connection managers especially on older hardware afaik
<kettenis_>
it is a gen9 so fairly recent
<sven>
shows how clueless I am still about thunderbolt ;)
<sven>
does hotplug also work?
<kettenis_>
I'm kinda disappointed though; one of the reasons I got the x1 was because I wanted to look at what was needed in OpenBSD to have thunderbolt support
<kettenis_>
turns out that apart from a bug in the pci bridge resource management it just worked
<kettenis_>
inlcuding hotplug
<kettenis_>
just looks like normal PCIe hotplug to the os
<sven>
hah. sounds like some firmware somewhere does all the heavy lifting then
<sven>
from what I understand the NHI driver establishes the tunnel and then usually the pcie just gets a hotplug interrupt on x86
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<jannau>
I didn't noticed until now (or forgot) that hpmBusManager is an i2c device too. macos reads something after interrupts, maybe the interrupt source?
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<jeffmiw>
back trying ot recover my mba M1 that is not booting at all any more (no sign of life). I compiled & installed all the libimobiledevice tools but I'm getting this error when doing an idevicerestore --latest -v :
<jeffmiw>
Sending iBEC (497779 bytes)...
<jeffmiw>
ERROR: Device did not disconnect. Possibly invalid iBEC. Reset device and try again.
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<jeffmiw>
I can see the device usb enumeration: [Fri Jan 20 20:46:40 2023] usb 3-1.1: Product: Apple Mobile Device (Recovery Mode)
<jeffmiw>
anyone faced this previously ? I saw mention that marcan you were able to recover a mpb with idevicerestore ?
<mps>
jeffmiw: for me idevicerestore didn't worked and I solved this by using another macbook with macos
<mps>
don't know if my problem was like your
<jeffmiw>
and how did you solve it ? Latest Apple Configurator 2 ? or something else ? my other mac is a mba 2012 and I can't get latest Apple Conf 2 on it ...
<mps>
I used m1 macbook
<jeffmiw>
did you have any sign of life (apple logo or missing disk icon ) ?
<jeffmiw>
and do you remember how usb enum was seen ? was it Product: Apple Mobile Device (Recovery Mode) ?
<mps>
but I think if it is identified on other machine it should work, my idevicerestore was old and I was lazy to uprage all 'batteries' needed for it
<mps>
jeffmiw: I forgot exact details
<mps>
I followed tpw_rules guide above
<jeffmiw>
tpw_rules: thanks, let me try to fix this then. usefull guide !
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<jeffmiw>
having some hope: got into DFU mode for real, got an apple logo now :) thanks tpw_rules !
<nicolas17>
DFU mode by itself doesn't show anything on screen, so if you're seeing an Apple logo it means the restore process actually made some progress
<nicolas17>
yay
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<tpw_rules>
yeah that means it's pretty much worked
<jeffmiw>
humm getting stuck now at the "Waiting for device to enter restore mode..." step. I must have not configured usbmuxd correctly. I did the make & make install, and launched it with sudo. Anything else to be done for it to work ?
<tpw_rules>
did you start usbmuxd?
<nicolas17>
well, is usbmuxd running?
<nicolas17>
on some distros it auto starts on boot or on USB-device-connect (via udev)
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<jeffmiw>
ok so I was running an old already installed version of usbmuxd. with the latest one, I was able to recover my mba M1 ! Thanks for the help. Now back to hwmon driver :)
<nicolas17>
how did it break in the first place?
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<jeffmiw>
I deleted some partitions of the asahi minimal install to grow my asahi linux partition with parted. everything worked well till the next reboot without any sign of life
<jeffmiw>
linux=>desktop
<jeffmiw>
parted must have left the partition table in a state that iboot was not happy with.
<jeffmiw>
note that I have not lost any macos(I have 2 of them) or asahi data while doing the recovery
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