1 files changed, 8 insertions, 9 deletions

diff --git a/drivers/ide/pci/piix.c b/drivers/ide/pci/piix.c
index 4f69cd067e5e..5cfa9378bbb8 100644
--- a/drivers/ide/pci/piix.c
+++ b/drivers/ide/pci/piix.c
@@ -1,5 +1,5 @@
 /*
- *  linux/drivers/ide/pci/piix.c        Version 0.50    Jun 10, 2007
+ *  linux/drivers/ide/pci/piix.c        Version 0.51    Jul 6, 2007
  *
  *  Copyright (C) 1998-1999 Andrzej Krzysztofowicz, Author and Maintainer
  *  Copyright (C) 1998-2000 Andre Hedrick <andre@linux-ide.org>
@@ -109,7 +109,7 @@ static int no_piix_dma;
  *      piix_dma_2_pio          -       return the PIO mode matching DMA
  *      @xfer_rate: transfer speed
  *
- *      Returns the nearest equivalent PIO timing for the PIO or DMA
+ *      Returns the nearest equivalent PIO timing for the DMA
  *      mode requested by the controller.
  */
  
@@ -123,20 +123,14 @@ static u8 piix_dma_2_pio (u8 xfer_rate) {
                 case XFER_UDMA_1:
                 case XFER_UDMA_0:
                 case XFER_MW_DMA_2:
-                case XFER_PIO_4:
                         return 4;
                 case XFER_MW_DMA_1:
-                case XFER_PIO_3:
                         return 3;
                 case XFER_SW_DMA_2:
-                case XFER_PIO_2:
                         return 2;
                 case XFER_MW_DMA_0:
                 case XFER_SW_DMA_1:
                 case XFER_SW_DMA_0:
-                case XFER_PIO_1:
-                case XFER_PIO_0:
-                case XFER_PIO_SLOW:
                 default:
                         return 0;
         }
@@ -269,6 +263,7 @@ static int piix_tune_chipset (ide_drive_t *drive, u8 xferspeed)
                 case XFER_PIO_4:
                 case XFER_PIO_3:
                 case XFER_PIO_2:
+                case XFER_PIO_1:
                 case XFER_PIO_0:        break;
                 default:                return -1;
         }
@@ -299,7 +294,11 @@ static int piix_tune_chipset (ide_drive_t *drive, u8 xferspeed)
                         pci_write_config_byte(dev, 0x55, (u8) reg55 & ~w_flag);
         }
 
-        piix_tune_pio(drive, piix_dma_2_pio(speed));
+        if (speed > XFER_PIO_4)
+                piix_tune_pio(drive, piix_dma_2_pio(speed));
+        else
+                piix_tune_pio(drive, speed - XFER_PIO_0);
+
         return ide_config_drive_speed(drive, speed);
 }