Re: [PATCH] libata: disable forced PORTS_IMPL for >= v3.0 controllers

On Thu, Jan 14, 2016 at 2:37 PM, Tejun Heo [off-list ref] wrote:

Some early controllers incorrectly reported zero ports in PORTS_IMPL
register and the ahci driver fabricates PORTS_IMPL from the number of
ports in those cases.  This hasn't mattered but with the new nvme
controllers there are cases where zero PORTS_IMPL is valid and should
be honored.

Disable the workaround for controllers >= v3.0.

I still see:

[  +0.001350] ahci 0000:00:17.0: version 3.0
[  +0.000034] ahci 0000:00:17.0: forcing PORTS_IMPL to 0xff

My "vers" is 0x10301.

--Andy