Update: I2C bus driver TIMEDOUT because of PM autosuspend

Update: I2C bus driver TIMEDOUT because of PM autosuspend

[Primoz Beltram]

I must update my report. It is not PM autosuspend (void calls do 
nothing, no miracle here).

This morning I reproduced the I2C timeout error also with 
XIIC_PM_TIMEOUT=10000 delay. For several days some other change was 
misleading me to PM autosuspend conclusion.

What looks to me now is that just slight change in driver code (e.g. add 
or remove dev_info() call) changes the execution timing pattern of 
driver and this then determine if the problem probability window is hit 
or not. Probability to hit the problem is very low.

The driver timeout error and its result to I2C bus blocked is still a 
problem.

I would still like to let the maintainer aware of this problem.


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Re: Update: I2C bus driver TIMEDOUT because of PM autosuspend

[Greg KH]

On Thu, Nov 28, 2019 at 10:32:42AM +0100, Primoz Beltram wrote:
> I must update my report. It is not PM autosuspend (void calls do nothing, no
> miracle here).
> 
> This morning I reproduced the I2C timeout error also with
> XIIC_PM_TIMEOUT=10000 delay. For several days some other change was
> misleading me to PM autosuspend conclusion.
> 
> What looks to me now is that just slight change in driver code (e.g. add or
> remove dev_info() call) changes the execution timing pattern of driver and
> this then determine if the problem probability window is hit or not.
> Probability to hit the problem is very low.
> 
> The driver timeout error and its result to I2C bus blocked is still a
> problem.
> 
> I would still like to let the maintainer aware of this problem.

Then email them, and not some other random mailing list :)

good luck!

greg k-h

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