Re: GPMI iMX6ull timeout on DMA

[Miquel Raynal <miquel.raynal@xxxxxxxxxxx>]

Hi Michael,

Michael Nazzareno Trimarchi <michael@xxxxxxxxxxxxxxxxxxxx> wrote on
Mon, 29 Jul 2019 22:00:25 +0200:

> Hi Miquel
> 
> sorry was difficult day ;). My answer below
> 

No pb ;)

[...]

> > > > > > > > That's strange... I don't get what would produce
such unstable issue.  
> > > > > > >
> > > > > > > My initial guess is that the calculated timing is very marginal.  
> > > > > >
> > > > > > What do you mean by "marginal"?
> > > > > >  
> > > > >
> > > > > I don't think that is timing calculation. I have tried to use the same timing
> > > > > as before but when those are applide. Is it possible?  
> > > >
> > > >                                       ^
> > > > I suppose the end of the sentence is missing?  
> >
> > Michael, what did you mean here?
> >  
> commit 02c786627b93b3c3286570f793294816286ff397
> Author: Michael Trimarchi <michael@xxxxxxxxxxxxxxxxxxxx>
> Date:   Fri Oct 5 09:46:29 2018 +0200
> 
>     Revert "mtd: rawnand: gpmi: use core timings instead of an
> empirical derivation"
> 
>     This reverts commit b1206122069aadabe1a8c50789277a978aaa4df7.
> 
>     Change-Id: Icd0ddcd5e3ac7d82932bbf412299cca424cbc571
>     Jira-Id: WAN-50
>     Signed-off-by: Michael Trimarchi <michael@xxxxxxxxxxxxxxxxxxxx>
> 
> Revert this one does not fix the problem. Right now I have two revert
> this one and
> 
> commit 6ab543c1924f77957004994bd6806a9daa45f903 (tag: MMI_004_011_R02)
> Author: Michael Trimarchi <michael@xxxxxxxxxxxxxxxxxxxx>
> Date:   Fri Oct 5 09:46:44 2018 +0200
> 
>     Revert "mtd: rawnand: gpmi: support ->setup_data_interface()"
> 
>     This reverts commit 76e1a0086a0c3276b384f77905345e0fcc886fdd.
> 
>     Change-Id: I60fb6f874364d1deeda3424d4508553a38ac9b1a
>     Jira-Id: WAN-50
>     Signed-off-by: Michael Trimarchi <michael@xxxxxxxxxxxxxxxxxxxx>
> 
> I did not have time to finish to undestand why this was fixing my problem

Ok so I am pretty convinced that this is still a timings issue then;
but not entirely due to the different timings calculation. Interesting.
I'm waiting for Greg's results now.


Thanks,
Miquèl

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