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authorTejun Heo <tj@kernel.org>2016-01-15 15:13:05 -0500
committerTejun Heo <tj@kernel.org>2016-01-25 15:45:55 -0500
commit566d1827df2ef0cbe921d3d6946ac3007b1a6938 (patch)
tree86327a975ac2d4b675cff10be69128fc977edac6 /drivers/ata
parentb00622fc34e9d45069bd6e328dfd47ea2ef61468 (diff)
libata: disable forced PORTS_IMPL for >= AHCI 1.3
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> Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/ata')
-rw-r--r--drivers/ata/libahci.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index 284a176076f5..402967902cbe 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 < 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);