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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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tejun Heo 2016-01-15 15:13:05 -05:00 committed by Greg Kroah-Hartman
parent d2b76ee268
commit f6c2bfd8a8
1 changed files with 2 additions and 2 deletions
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4
drivers/ata/libahci.c
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@ -486,8 +486,8 @@ void ahci_save_initial_config(struct device *dev,
}
}
/* fabricate port_map from cap.nr_ports */
if (!port_map) {
/* fabricate port_map from cap.nr_ports for < AHCI 1.3 */
if (!port_map && vers < 0x10300) {
port_map = (1 << ahci_nr_ports(cap)) - 1;
dev_warn(dev, "forcing PORTS_IMPL to 0x%x\n", port_map);