[Letux-kernel] Debugging 4.11-rc6 on GTA04

H. Nikolaus Schaller hns at goldelico.com
Tue Apr 11 20:10:52 CEST 2017

> Am 11.04.2017 um 19:49 schrieb Andreas Kemnade <andreas at kemnade.info>:
> On Tue, 11 Apr 2017 15:36:32 +0200
> "H. Nikolaus Schaller" <hns at goldelico.com> wrote:
>> Hi Andreas,
>>> Am 11.04.2017 um 12:43 schrieb Andreas Kemnade <andreas at kemnade.info>:
>>> On Mon, 10 Apr 2017 22:01:28 +0200
>>> "H. Nikolaus Schaller" <hns at goldelico.com> wrote:
>>>>> Am 10.04.2017 um 20:13 schrieb H. Nikolaus Schaller <hns at goldelico.com>:
>>>>> Hi,
>>>>> I have found a little time to upgrade our tree to 4.11-rc6
>>>>> and for the first time there were no kernel oops on the GTA04(A5)
>>>>> until login.
>>>>> Only the LCD is broken :(
>>>>> On the Pyra the same kernel works well. So it seems to be
>>>>> OMAP3 specific (maybe again some interference of the TILER
>>>>> addition, but I can easily check by merging my 4.11-rc6
>>>>> without TILER).
>>>> I have now built w/o TILER and for the first two boot attempts I had the
>>>> same error. But the third one succeeded. This time I got
>>> [...]
>>>> And the ethernet gadget was not loaded (initially). No VBUS event reported. But charger started charging.
>>>> After unplugging the USB cable I got:
>>>> root at letux:~# [  230.016326] musb-hdrc musb-hdrc.0.auto: VBUS_ERROR in b_idle (90, <VBusValid), retry #0, port1 00000100
>>>> And then:
>>>> [  237.857330] g_ether gadget: high-speed config #1: CDC Ethernet (ECM)
>>>> [  238.624481] IPv6: ADDRCONF(NETDEV_CHANGE): usb0: link becomes ready
>>>> Otherwise I didn't see any significant issue.
>>>> So it looks as if we still have two bugs: one in musb and another one in TILER/crtc.
>>> Sounds like problems which can be bisected on mainline. I think I will
>>> bisect this evening a bit. With musb, there is probably just another
>>> enable/disable balancing problem which must be somehow worked around in
>>> the glue layer or phy.
>> Good ideas!
>> But this gave me another idea... I have added a command line option to my
>> merge script so that it ignores the mergefile. Then I can add a handful
>> of our feature branches to be merged on top of letux-base.
>> With these ones, I could get it compiled and run on the GTA04A5 (of course missing sound,
>> inverted touch etc.):
>> ./merge -p -nmf -- work/hns/letux/rootfs work/hns/dt/gta04 work/hns/dt/gta04a5 work/hns/mtd/onenand work/marek/generic-adc-battery work/hns/misc/w2sg-serdev
>> Result is at:
>> http://git.goldelico.com/?p=gta04-kernel.git;a=shortlog;h=refs/heads/letux-4.11-rc6%2Brootfs%2Bgta04%2Bgta04a5%2Bonenand%2Bgeneric-adc-battery%2Bw2sg-serdev
>> Interestingly our feature branches are not as independent as they should
>> be... The generic adc battery is needed for some #include in the GTA04DT and
>> GTA04A5 wants to modify a bluetooth node that comes through the w2sg-serdev
>> branch.
>> Anyways, the important information is: with this minimum set of feature branches
>> I have neither problems with musb nor display. So the issue is not coming from
>> mainline...
> Well, I have just a white screen here with that. So, there is more...

Hm. That is unexpected... I am not 100% sure if I did a clean build.

> AFAICR, the most important this
> missing in twl4030_charger are the things to have detection working when
> the stuff is loaded. So for mainline experiments, the idea would be to
> build musb/twl stuff not as modules. And keep our device tree.

Well, the strangest thing is that I have merged all the listed branches on
top of letux-base and all of them work.

So I am either making a systematic mistake or the real bug is outside of the
musb/twl4030 subsystem.

I think I will have to bisect the mergefile until I find the problematic
feature branch...


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