pata_cmd64x: fix PIO setup

Fix incorrect handling of recovery clocks value == 16 resulting
in overclocked recovery timings & potentially underclocked active
timings.
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

drivers/ata/pata_cmd64x.c

@@ -2,6 +2,7 @@
  * pata_cmd64x.c 	- CMD64x PATA for new ATA layer
  *			  (C) 2005 Red Hat Inc
  *			  Alan Cox <alan@lxorguk.ukuu.org.uk>
+ *			  (C) 2009-2010 Bartlomiej Zolnierkiewicz
  *
  * Based upon
  * linux/drivers/ide/pci/cmd64x.c		Version 1.30	Sept 10, 2002
@@ -147,7 +148,9 @@ static void cmd64x_set_timing(struct ata_port *ap, struct ata_device *adev, u8 m
 	/* Now convert the clocks into values we can actually stuff into
 	   the chip */
 
-	if (t.recover > 1)
+	if (t.recover == 16)
+		t.recover = 0;
+	else if (t.recover > 1)
 		t.recover--;
 	else
 		t.recover = 15;