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| author | Tejun Heo | 2016-01-15 21:13:05 +0100 |
|---|---|---|
| committer | Tejun Heo | 2016-01-25 21:45:55 +0100 |
| commit | 566d1827df2ef0cbe921d3d6946ac3007b1a6938 (patch) | |
| tree | 86327a975ac2d4b675cff10be69128fc977edac6 /drivers/ata/libahci.c | |
| parent | libata: blacklist a Viking flash model for MWDMA corruption (diff) | |
| download | kernel-qcow2-linux-566d1827df2ef0cbe921d3d6946ac3007b1a6938.tar.gz kernel-qcow2-linux-566d1827df2ef0cbe921d3d6946ac3007b1a6938.tar.xz kernel-qcow2-linux-566d1827df2ef0cbe921d3d6946ac3007b1a6938.zip | |
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/libahci.c')
| -rw-r--r-- | drivers/ata/libahci.c | 4 |
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); |