Puneet Shenoy <puneet@...> writes:
>
> Hey Bill,
>
> I see that you are the author of the i2c-ismt driver so thought will check
with you on a issue that I have been
> seeing on my setup.
>
> My setup has an Intel Atom S1220 Processor which has a PMBUS device on its
SMBUS 2.0 controller (SMBus—Bus
> 0:D19:F0-1).
>
> Now while accessing(read/write) the PMBUS device, I see the following
error messages:
> [10799.333083] ismt_smbus 0000:00:13.1: completion wait timed out
> [10800.337089] ismt_smbus 0000:00:13.1: completion wait timed out
> [10801.341097] ismt_smbus 0000:00:13.1: completion wait timed out
> [10802.345105] ismt_smbus 0000:00:13.1: completion wait timed out
>
> All read/write access to the device fail when its in this state. The issue
is hard to reproduce and happens
> once in a while.
>
> I tried rmmod/modprobe the driver, but that doesn't help. I dumped the
relevant registers that are
> dev_dbg'ed in the driver and compared the data between the failed and
working cases and I don't see any
> difference.
> Once in a while when I am in the failed state, I see the In Progress Bit
(Bit 0) in the MSTS (Master Status
> Register) being set but its not always the case.
>
> Have you seen this issue before ? Any pointers on how to debug this ?
>
> Appreciate any help.
> Thanks
> Puneet--
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>
Puneet,
Did you get anything on this?
Even i am also facing same error with smbus controller 2.
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