libata: cable logic

The cable detect isolation patch inadvertently removed 40 wire short
cable handling. Put it back

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index f60988f5e01b..2556ea29defb 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -4033,6 +4033,10 @@ static int cable_is_40wire(struct ata_port *ap)
         /* If the controller thinks we are 80 wire, we are */
         if (ap->cbl == ATA_CBL_PATA80 || ap->cbl == ATA_CBL_SATA)
                 return 0;
+        /* If the system is known to be 40 wire short cable (eg laptop),
+           then we allow 80 wire modes even if the drive isn't sure */
+        if (ap->cbl == ATA_CBL_PATA40_SHORT)
+                return 0;
         /* If the controller doesn't know we scan
 
            - Note: We look for all 40 wire detects at this point.