Re: sata_mv: hard resetting port

[Mark Lord <liml@rtr.ca>]

Eric D. Mudama wrote:
> On Nov 15, 2007 7:31 AM, Mark Lord <liml@rtr.ca> wrote:
>> Here, the messages fail us.  The edma_err value says that there
>> should be a non-zero value in the SErr value.  Except the messages
>> show zero there, meaning the registers were probably read in the
>> wrong sequence (some bits clear automatically on reads).
> 
> Isn't that the reset signature?
..

No, it's just funny status.  The chipset (Marvell) claims it saw
a SATA error.  But the SATA error register is all-zeros, meaning "no error".

I think somebody forgot to save the latter before clearing it,
or somebody forgot to clear the former from an earlier error.
Either way, a nuisance, but no harm done here.

> Maybe due to insufficient power the drive decided to reboot itself.
> 
> (What bits clear automatically on read, other than IRQ?)
..

Mmm.. none in this case (my mistake).