Mark Lord wrote:

quoted

Heh... I never thought a PMP aware controller would use TF SRST, so what
you want to do is set pmp value in the register and calling
ata_std_softreset(), right?  I think the correct thing to do is to
separate out SRST sequence proper from ata_std_softreset() into, say,
ata_sff_SRST() and build custom softreset around it.  After all, the
problem here is the reset sequence not the SCR access.

..

Actually, I believe the problem *is* the (pmp) SCR access.
The same issue will return again when trying to support hotplug, for
example.

Can you elaborate a bit?

Any SCR access will steal the active pmp on such hosts.

I think we really do need to snoop those, somehow.

Adding ->sata_pmp_scr_read/write should do but I wanna avoid that if
possible.

Thanks.

-- 
tejun