linux-kernel - [PATCH] libata: disable forced PORTS

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Date:	Thu, 14 Jan 2016 17:37:32 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	linux-ide@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] libata: disable forced PORTS_IMPL for >= v3.0 controllers

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.

Signed-off-by: Tejun Heo <tj@...nel.org>
Reported-by: Andy Lutomirski <luto@...capital.net>
Link: http://lkml.kernel.org/g/CALCETrU7yMvXEDhjAUShoHEhDwifJGapdw--BKxsP0jmjKGmRw@mail.gmail.com
---
Hello, Andy.

Can you please test whether this fixes the issue?

Thanks.

 drivers/ata/libahci.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index d61740e..4931075 100644
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -496,8 +496,8 @@ void ahci_save_initial_config(struct device *dev, struct ahci_host_priv *hpriv)
 		}
 	}
 
-	/* fabricate port_map from cap.nr_ports */
-	if (!port_map) {
+	/* fabricate port_map from cap.nr_ports for older controllers */
+	if (!port_map && (vers >> 16) <= 2) {
 		port_map = (1 << ahci_nr_ports(cap)) - 1;
 		dev_warn(dev, "forcing PORTS_IMPL to 0x%x\n", port_map);