ChanServ changed the topic of #linux-rockchip to: Rockchip development discussion | Wiki at http://linux-rockchip.info | Logs at http://irclog.whitequark.org/linux-rockchip | ML at http://groups.google.com/group/linux-rockchip
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<ayaka> Myy, I will check the API upgrade
<Myy> Alright. I did some quick tests but with no success. I'll try to GDB the kernel this weekend
<ayaka> Myy, you mean kgdb?
<Myy> Yeah but it complained about ->counted being missing, so I might have overlooked some changes in the DRM code
<Myy> Yeah
<phh> Myy: have you checked how I handled the atomic_read changes?
<phh> I remember fixing it, and I remember I properly looked at how I was supposed to do that
<Myy> No, I'll give it a look
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<ayaka> anyway, I will begin that as well
<ayaka> phh, it seems that the base of you would be better
<Myy> The crash might be unrelated though.
<phh> Myy: ah it's a crash, I thought you had a lockup
<Myy> Yeah, well. It's "load the module and.... I can reboot the machine I guess..."
<phh> ok
<phh> well, for me it went better than that
<phh> I could decode some frames
<Myy> I'll retry that on the Gentoo box. I originally developped on it so there might be something in the global ARMbian configuration that triggered this issue.
<Myy> Meanwhile, I'll see how to have a decent simple IDE on Linux. I'm starting to get tired of kdevelop. If you know good autocompletion modules for vim/emacs, I'm all hear (´・ω・` )
<ayaka> I am still fixing my raid card, I am a little busy this week
<ayaka> but it seems necessary to begin this work now
<Myy> Alright
<ayaka> I won't like to use kgdb, it is really hard to make it work with module
<Myy> Well, I'll just use it to have a clue about where things went wrong. Worst case, it will require reintegrating the whole VCodec code inside the kernel during the testing phase.
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<phh> Myy: you have pstore or a serial to debug your kernel crash?
<Myy> Well, I have the good old UART connection.
<phh> right. and you get anything on uart with the lock-up/crash?
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<phh> worst case you should get some stack trace after 2 minutes
<Myy> Didn't try that ATM. I'll see when the Gentoo will finish compiling its own kernel version.
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<Myy> Yup, tried back on Gentoo and it's a nice freeze. I'll connect it on UART and see if I get something useful
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<Myy> After some fiddling, I'm starting to think that the new API is just a red herring and the real reason is elsewhere.
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<Myy> using kgdb didn't help me much. The freeze seems to be instantaneous.
<Myy> I guess I'll have to reduce the driver to the bare minimum and reextend it little by little until I pinpoint the crashing instructions
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<Myy> Ok, the issue seems to be located in the if (of_property_read_bool(np, "subcnt")) of the vcodec_probe section
<Myy> If I put a return 0 before, the driver loads but crash on remove (probably because a few things didn't get initialized correctly, I don't know)
<Myy> However, if I move the 'return 0' just before that 'if' clause, it hangs on load
<Myy> So I'll investigate vcodec_subdev_probe tomorrow, see if I can pinpoint the issue exactly
<Myy> However, the debugger is of no use given how the whole thing freezes instantly.
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<Myy> I tried removing the CONFIG_RK_IOVMM part from the subdev init code but it also hanged
<Myy> I'll continue to try pinpointing this issue tomorrow
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