(2.6.20) pata_oldpiix: fix PIO2 underclocking

Fix the PIO mode 2 using mode 0 timings -- this driver should enable the
fast timing bank starting with PIO2, just like the ata_piix driver does.
Also, fix/rephrase some comments while at it.
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/ata/pata_oldpiix.c

@@ -25,7 +25,7 @@
 #include <linux/ata.h>
 
 #define DRV_NAME	"pata_oldpiix"
-#define DRV_VERSION	"0.5.2"
+#define DRV_VERSION	"0.5.3"
 
 /**
  *	oldpiix_pre_reset		-	probe begin
@@ -94,19 +94,21 @@ static void oldpiix_set_piomode (struct ata_port *ap, struct ata_device *adev)
 			    { 2, 1 },
 			    { 2, 3 }, };
 
-	if (pio > 2)
-		control |= 1;	/* TIME1 enable */
+	if (pio > 1)
+		control |= 1;	/* TIME */
 	if (ata_pio_need_iordy(adev))
-		control |= 2;	/* IE IORDY */
+		control |= 2;	/* IE */
 
-	/* Intel specifies that the PPE functionality is for disk only */
+	/* Intel specifies that the prefetch/posting is for disk only */
 	if (adev->class == ATA_DEV_ATA)
-		control |= 4;	/* PPE enable */
+		control |= 4;	/* PPE */
 
 	pci_read_config_word(dev, idetm_port, &idetm_data);
 
-	/* Enable PPE, IE and TIME as appropriate. Clear the other
-	   drive timing bits */
+	/*
+	 * Set PPE, IE and TIME as appropriate.
+	 * Clear the other drive's timing bits.
+	 */
 	if (adev->devno == 0) {
 		idetm_data &= 0xCCE0;
 		idetm_data |= control;