pata_it8213: fix PIO2 underclocking

[ port of Sergei's fixes for pata_efar from commit 5f33b3b ]

Fix the PIO mode 2 using mode 0 timings -- this driver should enable the
fast timing bank starting with PIO2, just like the PIIX/ICH drivers do.
Also, fix/rephrase some comments while at it.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 6 insertions, 7 deletions

diff --git a/drivers/ata/pata_it8213.c b/drivers/ata/pata_it8213.c
index 092af531aa0..f0bf77ad371 100644
--- a/drivers/ata/pata_it8213.c
+++ b/drivers/ata/pata_it8213.c
@@ -92,18 +92,17 @@ static void it8213_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))   /* PIO 3/4 require IORDY */
-                control |= 2;   /* IORDY enable */
+                control |= 2;   /* IE */
         /* Bit 2 is set for ATAPI on the IT8213 - reverse of ICH/PIIX */
         if (adev->class != ATA_DEV_ATA)
-                control |= 4;
+                control |= 4;   /* PPE */
 
         pci_read_config_word(dev, idetm_port, &idetm_data);
 
-        /* Enable PPE, IE and TIME as appropriate */
-
+        /* Set PPE, IE, and TIME as appropriate */
         if (adev->devno == 0) {
                 idetm_data &= 0xCCF0;
                 idetm_data |= control;
@@ -122,7 +121,7 @@ static void it8213_set_piomode (struct ata_port *ap, struct ata_device *adev)
                 pci_write_config_byte(dev, 0x44, slave_data);
         }
 
-        idetm_data |= 0x4000;   /* Ensure SITRE is enabled */
+        idetm_data |= 0x4000;   /* Ensure SITRE is set */
         pci_write_config_word(dev, idetm_port, idetm_data);
 }