it8213/piix/slc90e66: don't change DMA settings when programming PIO

Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 7 insertions, 10 deletions

diff --git a/drivers/ide/pci/piix.c b/drivers/ide/pci/piix.c
index 07492d71c602..860b929f6e58 100644
--- a/drivers/ide/pci/piix.c
+++ b/drivers/ide/pci/piix.c
@@ -1,5 +1,5 @@
 /*
- *  linux/drivers/ide/pci/piix.c        Version 0.51    Jul 6, 2007
+ *  linux/drivers/ide/pci/piix.c        Version 0.52    Jul 14, 2007
  *
  *  Copyright (C) 1998-1999 Andrzej Krzysztofowicz, Author and Maintainer
  *  Copyright (C) 1998-2000 Andre Hedrick <andre@linux-ide.org>
@@ -242,6 +242,11 @@ static int piix_tune_chipset(ide_drive_t *drive, const u8 speed)
         u16                     reg4042, reg4a;
         u8                      reg48, reg54, reg55;
 
+        if (speed >= XFER_PIO_0 && speed <= XFER_PIO_4) {
+                piix_tune_pio(drive, speed - XFER_PIO_0);
+                return ide_config_drive_speed(drive, speed);
+        }
+
         pci_read_config_word(dev, maslave, &reg4042);
         sitre = (reg4042 & 0x4000) ? 1 : 0;
         pci_read_config_byte(dev, 0x48, &reg48);
@@ -259,11 +264,6 @@ static int piix_tune_chipset(ide_drive_t *drive, const u8 speed)
                 case XFER_MW_DMA_2:
                 case XFER_MW_DMA_1:
                 case XFER_SW_DMA_2:     break;
-                case XFER_PIO_4:
-                case XFER_PIO_3:
-                case XFER_PIO_2:
-                case XFER_PIO_1:
-                case XFER_PIO_0:        break;
                 default:                return -1;
         }
 
@@ -293,10 +293,7 @@ static int piix_tune_chipset(ide_drive_t *drive, const u8 speed)
                         pci_write_config_byte(dev, 0x55, (u8) reg55 & ~w_flag);
         }
 
-        if (speed > XFER_PIO_4)
-                piix_tune_pio(drive, piix_dma_2_pio(speed));
-        else
-                piix_tune_pio(drive, speed - XFER_PIO_0);
+        piix_tune_pio(drive, piix_dma_2_pio(speed));
 
         return ide_config_drive_speed(drive, speed);
 }