1 files changed, 30 insertions, 19 deletions

diff --git a/drivers/ide/pci/piix.c b/drivers/ide/pci/piix.c
index 569822f4cf55..061d300ab8be 100644
--- a/drivers/ide/pci/piix.c
+++ b/drivers/ide/pci/piix.c
@@ -1,10 +1,10 @@
 /*
- *  linux/drivers/ide/pci/piix.c        Version 0.46    December 3, 2006
+ *  linux/drivers/ide/pci/piix.c        Version 0.47    February 8, 2007
  *
  *  Copyright (C) 1998-1999 Andrzej Krzysztofowicz, Author and Maintainer
  *  Copyright (C) 1998-2000 Andre Hedrick <andre@linux-ide.org>
  *  Copyright (C) 2003 Red Hat Inc <alan@redhat.com>
- *  Copyright (C) 2006 MontaVista Software, Inc. <source@mvista.com>
+ *  Copyright (C) 2006-2007 MontaVista Software, Inc. <source@mvista.com>
  *
  *  May be copied or modified under the terms of the GNU General Public License
  *
@@ -205,14 +205,13 @@ static u8 piix_dma_2_pio (u8 xfer_rate) {
 }
 
 /**
- *      piix_tune_drive         -       tune a drive attached to a PIIX
+ *      piix_tune_pio           -       tune PIIX for PIO mode
  *      @drive: drive to tune
  *      @pio: desired PIO mode
  *
- *      Set the interface PIO mode based upon  the settings done by AMI BIOS
- *      (might be useful if drive is not registered in CMOS for any reason).
+ *      Set the interface PIO mode based upon the settings done by AMI BIOS.
  */
-static void piix_tune_drive (ide_drive_t *drive, u8 pio)
+static void piix_tune_pio (ide_drive_t *drive, u8 pio)
 {
         ide_hwif_t *hwif        = HWIF(drive);
         struct pci_dev *dev     = hwif->pci_dev;
@@ -233,8 +232,6 @@ static void piix_tune_drive (ide_drive_t *drive, u8 pio)
                                         { 2, 1 },
                                         { 2, 3 }, };
 
-        pio = ide_get_best_pio_mode(drive, pio, 4, NULL);
-
         /*
          * Master vs slave is synchronized above us but the slave register is
          * shared by the two hwifs so the corner case of two slave timeouts in
@@ -253,19 +250,20 @@ static void piix_tune_drive (ide_drive_t *drive, u8 pio)
                 master_data |=  0x4000;
                 master_data &= ~0x0070;
                 if (pio > 1) {
-                        /* enable PPE, IE and TIME */
-                        master_data = master_data | (control << 4);
+                        /* Set PPE, IE and TIME */
+                        master_data |= control << 4;
                 }
                 pci_read_config_byte(dev, slave_port, &slave_data);
-                slave_data = slave_data & (hwif->channel ? 0x0f : 0xf0);
-                slave_data = slave_data | (((timings[pio][0] << 2) | timings[pio][1]) << (hwif->channel ? 4 : 0));
+                slave_data &= hwif->channel ? 0x0f : 0xf0;
+                slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) <<
+                               (hwif->channel ? 4 : 0);
         } else {
                 master_data &= ~0x3307;
                 if (pio > 1) {
                         /* enable PPE, IE and TIME */
-                        master_data = master_data | control;
+                        master_data |= control;
                 }
-                master_data = master_data | (timings[pio][0] << 12) | (timings[pio][1] << 8);
+                master_data |= (timings[pio][0] << 12) | (timings[pio][1] << 8);
         }
         pci_write_config_word(dev, master_port, master_data);
         if (is_slave)
@@ -274,6 +272,21 @@ static void piix_tune_drive (ide_drive_t *drive, u8 pio)
 }
 
 /**
+ *      piix_tune_drive         -       tune a drive attached to PIIX
+ *      @drive: drive to tune
+ *      @pio: desired PIO mode
+ *
+ *      Set the drive's PIO mode (might be useful if drive is not registered
+ *      in CMOS for any reason).
+ */
+static void piix_tune_drive (ide_drive_t *drive, u8 pio)
+{
+        pio = ide_get_best_pio_mode(drive, pio, 4, NULL);
+        piix_tune_pio(drive, pio);
+        (void) ide_config_drive_speed(drive, XFER_PIO_0 + pio);
+}
+
+/**
  *      piix_tune_chipset       -       tune a PIIX interface
  *      @drive: IDE drive to tune
  *      @xferspeed: speed to configure
@@ -348,8 +361,8 @@ static int piix_tune_chipset (ide_drive_t *drive, u8 xferspeed)
                         pci_write_config_byte(dev, 0x55, (u8) reg55 & ~w_flag);
         }
 
-        piix_tune_drive(drive, piix_dma_2_pio(speed));
-        return (ide_config_drive_speed(drive, speed));
+        piix_tune_pio(drive, piix_dma_2_pio(speed));
+        return ide_config_drive_speed(drive, speed);
 }
 
 /**
@@ -392,9 +405,7 @@ static int piix_config_drive_xfer_rate (ide_drive_t *drive)
                 return 0;
 
         if (ide_use_fast_pio(drive))
-                /* Find best PIO mode. */
-                piix_tune_chipset(drive, XFER_PIO_0 +
-                                  ide_get_best_pio_mode(drive, 255, 4, NULL));
+                piix_tune_drive(drive, 255);
 
         return -1;
 }