mmind00 changed the topic of #linux-rockchip to: Rockchip development discussion | public log at https://libera.irclog.whitequark.org/linux-rockchip
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<diederik> Looks like I'm on a lucky streak :) Installed that same 6.16-rc4 kernel on my RockPro64 and got a similar/related stack trace, but not the same: https://paste.sr.ht/~diederik/b4e7de1fb4e04289d69ddbd1a7071f2b3b147bc6
<diederik> This time with a "deferred probe pending" message. After a reboot, no stacktrace, but the familiar "ehci_hcd" warning
<diederik> Moreover, I got a rather sporadic error message, which I first saw a long time ago: "failed to register extcon device"
<diederik> And found some old (partial) logs: https://paste.sr.ht/~diederik/cfe606801d3dab0267bea7049687d24c0d6e8d71 about it. One on the PineTab2 and the other on a Quartz64-A
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<detlevc> CounterPillow: the decoder doesn't support 4:4:4 (well maybe just in black and white), so the 2 (a.k.a. or) is not possible. For point 1, I don't believe this is level 6 (1080p@50 shouldn't need that). I'm not ruling out a display side issue either
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<CounterPillow> diederik: this is somewhat worrying, extcon.c didn't change in a long time and the rockchip inno usb2 phy doesn't have any changes either. Possible we've always been broken and something uncovered the race condition now, needs investigating
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<diederik> yeah, and it's very difficult to reproduce. IIRC when I encountered it a previous time, I rebooted ~50 times ... and it didn't happen a single time
<diederik> My hope is that 'surrounding code' has improved since then (and especially recently) so that it now happens more often ... which should be beneficial when it comes to fixing it. Or it really was a 'lucky streak'
<CounterPillow> if I read the code right this may be caused if ida_alloc is broken which would be a huge problem
<CounterPillow> hm, and it can't be that either because the only recent commit there doesn't touch that code path afaict
<CounterPillow> ah, I see, it happened in 6.10 as well
<diederik> Yep, so my guess is that it indeed was always 'broken'.
<diederik> In case it helps, this is the kernel config: https://paste.sr.ht/~diederik/2905f86529641c22674a790fab5288ed5bc64b74
<CounterPillow> I'm a bit confused by how the function that's supposed to get us a unique ID returns a non-unique ID. My current guess is that extcon is using two different IDA handles unintentionally. To debug this I'd have to devise some sort of torture test for extcon to see if I can ever reproduce the race.
<diederik> I can't help with figuring out where/how the code is wrong, but I can collect information and/or try (debug) patches
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<diederik> Can you reproduce the "Warning! ehci_hcd should always be loaded before uhci_hcd and ohci_hcd, not after" warning? Because that one I get on almost every boot. If you know where that's coming from, it may be easier to track down where the real problem lies?
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