ChanServ changed the topic of #armlinux to: ARM kernel talk [Upstream kernel, find your vendor forums for questions about their kernels] | https://libera.irclog.whitequark.org/armlinux
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<Xogium>
ukleinek: you'll never guess what this was all about... A new hdmi connector node in the device tree, on which the hdmi transmitter was waiting on, and by extension, the sound device, and the entire display controller
<Xogium>
never mind I don't even use hdmi ;)
<Xogium>
also the hdmi connector didn't show up at all in devices_deferred, strangely enough
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<Xogium>
it was literally by luck I checked the commit that added this, then went like, huh, compatible hdmi-connector, hmm ? What sort of driver has that ? Then from there I realized that for whatever reason, said driver isn't enabled by default
<Xogium>
for the record
<Xogium>
CONFIG_DRM_DISPLAY_CONNECTOR=y
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<ukleinek>
Xogium: You had 5a001000.display-controller in your devices_deferred list though?!
<Xogium>
ukleinek: yes, but no reason why it was deferred. I had the hdmi transmitter, the display controller, and a parse error for audio-graph-card which was ultimately misleading, but no mention of hdmi-connector anywhere
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<Xogium>
the first conclusion I came to was that the hdmi-transmitter@39 on i2c1 was waiting for the sound device to show up, but the sound device had a parse error so it couldn't
<Xogium>
the real problem however was that the sound device got blocked by hdmi: connector of compatible hdmi-connector
<Xogium>
but that was not visible anywhere
<ukleinek>
Xogium: sounds like a bug?
<geertu>
Xogium: Perhaps the parse error should return -EPROBE_DEFER. st least for some cases? It might already do so, but the error might not be propagated correctly.
<ukleinek>
geertu: /sys/kernel/debug/devices_deferred had "sound asoc-audio-graph-card: parse error"
<geertu>
ukleinek: OK
<ukleinek>
Still "parse error" isn't a very good error message. Doesn't sound to me like redoing probe would fix it. I would expect an invalid dtb or something similar in this case.
<Xogium>
yeah :/
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<geertu>
arnd: "[PATCH] [v5] kallsyms: rework symbol lookup return codes
<geertu>
" is still missing in both next and upstream
<arnd>
geertu: ah, somehow I was expecting mcgrof or akpm to merge that one, but now I see that they probably expected me to do it. I'm planning to send an asm-generic PR for the syscall fixes, and can probably just combine that
<geertu>
arnd: thx!
<Xogium>
ukleinek: I'm also not quite sure why the connector did not show up at all in devices_deferred
<Xogium>
nor anywhere in dmesg as waiting for being probed
<Xogium>
I only see this when the driver is in my kernel
<Xogium>
platform connector: Fixed dependency cycle(s) with /soc/etzpc@5c007000/i2c@40012000/hdmi-transmitter@39
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<robmur01>
Xogium: deferring is generally something a driver does, so other than a few subsystem-level cases, if there's no driver then nothing happens at all
<robmur01>
and for "devices not yet probed", just look in /sys/bus/platform/devices for everything without a "driver" link
<Xogium>
robmur01: mmh, that makes sense. I will know what to try the next time I encounter something similar
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<robmur01>
in fact maybe I wasn't very clear there - even when deferral isn't triggered by the driver itself, there still can't be any probe to defer in the first place unless a matching driver *is* present
<Xogium>
interesting
<Xogium>
well, it was not obvious at all, but at least now I'll know how to handle such strange cases, hopefully
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<marc|gonzalez>
Hello, not sure if there's a linux-tools channel on IRC? I have a b4 question. Is it possible to have it run git format-patch with stat=100 so as to not truncate the filepaths in the cover letter summary?
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