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
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<janneg>
sven: could the 14 vs. 0x14 error in PIPEHANDLER_OVERRIDE_VALUES explain the broken suspend or other issue we've seen with usb3?
<sven>
I don’t think so
<sven>
0x14 hardcoded some values for the phy interface when we switch the phy
<sven>
it’s not used after that function is done
<sven>
broken suspend is because xhci doesn’t wake up the ports, isn’t it?
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<kettenis>
janneg: I'm seeing the wrong brightness level being restored coming out of DPMS on the 13" M1 MacBook
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<kettenis>
I think the problem is that because I don't have a GPU driver (yet) the "next swap" that you refer to in iomfbep_cb_enable_backlight_message_ap_gated() never happens...
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<j`ey>
are you on 13.5 fw?
<kettenis>
still on 12.3 fw for this machine
<j`ey>
ok ignore me then
<kettenis>
but I see the same thing on the 13" M2 MacBook Air with 13.5 fw
<j`ey>
there was an issue with DCP and the iomfb_cb_pr_publish callback with later fw, but that appears to be a different issue
<janneg>
kettenis: known issue. lina and I tried to workaround that but I'm not sure if that ever was relieable. not related to the gpu driver but just how the application uses the kms device
<janneg>
this is one reason why we don't want to support Xorg on linux
<leio>
could this have something to do for why I need to delay the gdm start to get a successful modeset?
<janneg>
leio: no
<leio>
or rather not lose picture; ok
<janneg>
kettenis: for xorg/modesetting you could try if the tearfree option helps, that should do swaps but iirc I've never tested it
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<kettenis>
janneg: I still think this needs to be fixed; even if you believe Xorg should die there are other contexts where having a working dumb framebuffer is desirable
<kettenis>
is it really that difficult to force a flush from the iomfbep_cb_enable_backlight_message_ap_gated() callback?
<kettenis>
maybe from some delayed scheduled work such that it can be avoided if a swap already happened?
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<janneg>
kettenis: sure, the modesetting/tearfree comment was also about improving the experience on xorg in general
<janneg>
we certyainly can't issue a flush directly from iomfbep_cb_enable_backlight_message_ap_gated(). the easiest option would be to call dcp_set_brightness() from a a workqueue
<kettenis>
right, that was my idea; already has a check whether backlight.update is still set ;)
<janneg>
that already has the delay to to see if a swap has happened
<kettenis>
ok, I'll try that and if it works on OpenBSD I'll send you a diff to test on Linux ;)
<kettenis>
the other bit that I'm still struggling with is that drm_fb_helper_blank() doesn't seem to do the right thing
<kettenis>
but that probably is a problem in the drm atomic modeset code
<kettenis>
and for some reason dcp sometimes refuses to start; happens more often on the M1 MacBook than on the M1 mini
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<janneg>
drm_fb_helper_blank should result .atomic_enable / .atomic_disable calls
<janneg>
refuses to start in what sense? rtkit_wakeup fails? dcp_start()?
<kettenis>
hmm, so maybe this is fixed by "drm: apple: Move modeset into drm_crtc's atomic_enable" that I don't have yet
<kettenis>
looks like I really should update to the latest code as soon as possible ;)
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<janneg>
kettenis: I don't think so. my motivation was to untangle modeset and dcp_flush()
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<kettenis>
nice to see that with dpms there are some significant power savings
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<janneg>
marcan: asahi-soc-mailbox-6.8 is missing from asahi-soc/for-next
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<cyrinux>
Hello here, just to say that the last m1n1/uboot/edge kernel of asahi-dev (archlinux) , prevent m2 air to boot. I was able to enter my luks password but then totally blind.
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<janneg>
cyrinux: use the non-edge kernel. they are now fnuctionally the same
<janneg>
there is a problem with the local version of the edge kernel
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<cyrinux>
Ok janneg, thanks
<cyrinux>
same for vulkan and mesa ?
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<Lyude>
Hi! I'm one of the folks working on nouveau/nova, and I heard that y'all might be thinking of writing a new KMS driver in rust? I was curious whether there had been any progress here or any WIP branches I could look at, since we're hoping to also write a KMS driver in rust (and to help start moving rust in the kernel forward generally)
<j`ey>
unless KMS means the actual display driver? thats in C
<j`ey>
yeah
<j`ey>
just realised
<Lyude>
yeah I meant KMS :p
<chaos_princess>
both asahi kms drivers are in c
<j`ey>
but it's still probably helpful.. maybe
<Lyude>
there's two of them?
<j`ey>
Lyude: one for the touchbar
<Lyude>
Oh
<Lyude>
I guess that makes sense lol
<j`ey>
I think there was talk a year or so ago of doing it in rust.. but the C/driver has grown a lot since then
<Lyude>
Have the ABI differences with apple's firmware caused any problems for the KMS driver seeing as it's written in C?
<kettenis>
the ABI differences cause problems, regardless of whether the driver is written in C or rust ;)
<janneg>
cyrinux: no, just the kernel
<Lyude>
kettenis: good to know :p, we're kind of in a similar situation with nova since we don't really have much of a stable ABI guarantee from nvidia at the moment with GSP
<j`ey>
Lyude: DCP uses macros and 'templates' to support different versions
<janneg>
Lyude: it's mostly annoying to do in C. It uses #defines with multiple inclusion of template fiels
<chaos_princess>
i'd say dcp is a bit more stable-ish, since they have their cursed rpc protocol and some items are serialized dicts and not just bags of bytes.
<Lyude>
chaos_princess: yeah we just get bags of bytes :(
<Lyude>
at least they're documented bags though!
<janneg>
I want to rewrite it in Rust but I'm not sure if I ever find time for it
<Lyude>
well feel free to let me and folks like airlied/danilo/karolherbst know. We're already planning on doing the main driver in rust, while it'd be nice to be able to keep our display driver we sort of agreed the effort to make bindings between that and the main rust driver would be more effort then we'd like - and plus we'd kind of like everything to be in rust to make it more
<Lyude>
attractive to new contributors anyway (and start finally pushing things forward regarding actual rust code in the mainline kernel)
<janneg>
the interface is stable-ish but there is enough churn from release to release to be annoying
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