(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>

1 files changed, 10 insertions, 8 deletions

diff --git a/drivers/ata/pata_oldpiix.c b/drivers/ata/pata_oldpiix.c
index b76d2b466614..45215aa05e72 100644
--- a/drivers/ata/pata_oldpiix.c
+++ b/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;