<sven>
I can test that one myself later though, but good idea
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<rmk>
marcan: is there another backend for smc_core written at the moment to prove out the current code structure?
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<sven>
don't think so, I only vaguely recall someone working on linux for x86 macs with that T2 chip wanted to write one
<sven>
but no idea if they already started
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<amarioguy2>
i realize this is probably going to sound like a crazy idea but long term i think we could start bringing more and more parts of m1n1 over to rust
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<amarioguy2>
there's already some subsystems I see that can probably be converted to rust with minimal issue
<amarioguy2>
(ADT code is the thing I'm mainly looking at right now)
<sven>
what would be the benefit of that?
<sven>
rust for e.g. fat32 makes sense because that's a potential attack vector
<sven>
but if the ADT is malicious all bets are off anyway
<amarioguy2>
ah you're right, i forgot ADT was verified by iboot anyways
<amarioguy2>
i was thinking more from a general "C is obsolete" kinda perspective
<sven>
i think that's a pretty bad perspective
<sven>
rust makes a lot of sense in certain areas but converting from C to rust just because "C is obsolete" doesn't really gain anythiing
<sven>
might even prevent people who only know C from contributing
<amarioguy2>
gotcha that's fair it's not like i'm adamant on this or anything lol it was just something i had thought about the viability of
* amarioguy2
shelves that idea
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<kettenis>
rmk: no; the idea was that the existing code for the smc on intel macs could be refactored into another backend for smc_core
<kettenis>
but given lee's reply I wonder if adding this abstraction was a good idea
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<rmk>
kettenis: I'm thinking if we can have another backend soon, then it boosts the case for this abstraction
<rmk>
when I mooted the idea of not using mfd, Lee didn't seem to be keen on that idea either
<rmk>
I think it would help to see what a different backend would look like - not having another backend and makes trying to argue for this code structure quite difficult.
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<amarioguy2>
just asking what's the state on PSCI or some derivative thereof?
<j`ey>
I have a crappy PoC, but it looks like it'll just be done as some non-PSCI UEFI protocol in the end, but no code has been written
<maz>
j`ey: I though we'd have a discussion on the list first? did I miss anything?
<j`ey>
I dont think it was sent yet, that was just what was said on irc
<maz>
k
<sven>
you guys don't happen to have a device that specifically claims to be USB4 and not "just" thunderbolt around, do you?
<maz>
sven: how do you identify such a beast?
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<sven>
check if the marketing materials mention USB4 :D
<sven>
I e.g. have an older caldigit dock that's advertised as Thunderbolt 3. the newer version of that dock claims to be "Thunderbolt 4 / USB4"
<amarioguy2>
sven: i think newest amd mobile processors (6000 series) are usb4 only
<amarioguy2>
no official TBT certification
<sven>
I care about the _device_ here
<amarioguy2>
ah rip
<sven>
I want to see if tps6598x identifies it differently because the PD commands to enter USB4 are different from those used for pre-USB4 thunderbolt
<maz>
sven: I have a TB3 NVMe device that has a USB hub inside (the kernel says so when I plug it).
<maz>
any interest in that?
<sven>
that's the same as my tb3 dock I think :(
<maz>
right. it was worth checking anyway.
<sven>
yeah, thanks.
<sven>
I think usb4 devices are pretty new
<ChaosPrincess>
maz: usb over tb3 is usb3-over-pcie-over-tb, while usb over usb4 is usb over usb4
<ChaosPrincess>
they are kinda different on protocol level
<maz>
ChaosPrincess: given that I no TB support whatsoever in the kernel, I doubt that the USB hub I see has *anything* to do with tunelling.
<maz>
given that I *have*
<ChaosPrincess>
then i guess it can do both raw usb and usb wrapped in tb
<maz>
probably. the ports are definitely only doing standard USB3 at the moment.
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<sven>
hah, found the HPD signal. it's in one of the "reserved" bits in the tps6598x DATA_STATUS and triggers and irq there
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<sven>
hrm, what kind of displays would require 4 lane display port? 5k I guess?
<sven>
anyone with such a display that connects via display port and not thunderbolt here?
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<Dcow>
that's a rare thing I guess
<sven>
probably, it looks like apple modified some bits inside these cd321x chips and my 2-lane DP pin assignments looks like a 4-lane assignment. would be interesting to see how 4 lane actually looks
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<sven>
(and also to confirm my atcphy setup works for 4 lanes as well)
<sven>
oh, nevermind, my 4 lane code just did something dumb
<sven>
because technically this capture card doesn't have any usb3 connection so switching to 4 lane mode is correct here
<jannau>
my 5120x2160 monitor does iirc requires 4 lanes for 60Hz
<sven>
so now just HPD is missing and then I've finally shaved all yaks and can go back to thunderbolt :>
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<sven>
jannau: great! sounds like a good test for the 4 lane atcphy setup then
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<jannau>
anything to test now or is that for the linux drivers?
<sven>
Linux driver, I just messed up something in my code which confused me
<sven>
cd321x registers are exactly the same as tps6598x for the DP pin assignment
<sven>
now I just need to understand how to hook up the drm connector to the typec port in the device tree and write some glue code and then hopefully hotplugging displays should also work
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<ChaosPrincess>
for 4 lanes - can't you connect it with the worst possible cable so it will be unable to train anything above dp rbr speed?
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<sven>
lol, I wonder if that would actually work :D
<marcan>
fwiw I just picked up a USBC 4K monitor that I *think* does USB3+DP, so I can test with that
<marcan>
(as well as the usual assortment of HDMI adapters of course)
<marcan>
I also have a dock-like thing that definitely does 3+DP
<sven>
I have some old dock that does 3+dp as well
<sven>
and I’m pretty sure that will just work
<sven>
I hardcoded the mode to 3+DP before I implemented the typec stuff for the tps6598x thing today and at least the DP part worked
<sven>
yup, 3+DP works
<ajv009>
you guys are amazing
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<jannau>
so from one annoying problem (brightness mapping) to the next one (updating brightness without atomic_commit)
* jannau
looks angrily towards Xorg
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<jannau>
two problems with that. We shouldn't waste a frame swap for a brightness if userspace uses atomic_commit to update the screen like wayland compositors do
<jannau>
second problem, locking. drm has shielded us so far from most locking issues with wrt to the coprocessor communication
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