[lkml]   [2020]   [Apr]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH v2 1/2] i2c: tegra: Better handle case where CPU0 is busy for a long time
27.04.2020 17:13, Dmitry Osipenko пишет:
> 27.04.2020 15:46, Dmitry Osipenko пишет:
>> 23.04.2020 13:56, Jon Hunter пишет:
>>>>> So I think that part of the problem already existed prior to these
>>>>> patches. Without your patches I see ...
>>>>> [ 59.543528] tegra-i2c 7000d000.i2c: i2c transfer timed out
>>>>> [ 59.549036] vdd_sata,avdd_plle: failed to disable
>>>>> [ 59.553778] Failed to disable avdd-plle: -110
>>>>> [ 59.558150] tegra-pcie 3000.pcie: failed to disable regulators: -110
>>>> Does this I2C timeout happen with my patches? Could you please post full
>>>> logs of an older and the recent kernel versions?
>>> I believe that it does, but I need to check.
>> Jon, could you please confirm that you're seeing those regulator-disable
>> errors with my patch? I don't see those errors in yours original log [1].
>> [1]
>> Again, could you please post the *full* logs?
>> If regulator's disabling was "failing" before without my patch because
>> of the I2C interrupt being force-disabled during of NOIRQ phase, and now
>> regulator's disabling succeeds with my patch because IRQ is manually
>> handled after the timeout, then this could be bad. It means that
>> regulator was actually getting disabled, but I2C driver was timing out
>> because interrupt couldn't be handled in NOIRQ phase, which should
>> result in a dead PCIe on a resume from suspend since regulator's core
>> thinks that regulator is enabled (I2C said it failed to disable), while
>> it is actually disabled.
>> Do you have anything plugged into the PCIe slot in yours testing farm?
>> It wouldn't surprise me if the plugged card isn't functional after
>> resume from suspend on a stable kernels.
> I actually now see that interrupt is not allowed to be enabled during
> the NOIRQ phase:
> it should be worthwhile to turn it into a WARN_ON.

Oh, wait! There is already a warning there.. hmm.

 \ /
  Last update: 2020-04-27 16:45    [W:0.230 / U:6.740 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site