From: Tejun Heo <tj@kernel.org>
Date: Fri, 15 Jan 2016 20:13:05 +0000 (-0500)
Subject: libata: disable forced PORTS_IMPL for >= AHCI 1.3
X-Git-Tag: v3.2.78~49
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=70f16b6417a5725a7f4edfaade28e62694f9d784;p=pandora-kernel.git

libata: disable forced PORTS_IMPL for >= AHCI 1.3

commit 566d1827df2ef0cbe921d3d6946ac3007b1a6938 upstream.

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 >= AHCI 1.3.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Andy Lutomirski <luto@amacapital.net>
Link: http://lkml.kernel.org/g/CALCETrU7yMvXEDhjAUShoHEhDwifJGapdw--BKxsP0jmjKGmRw@mail.gmail.com
Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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