piix: tuneproc() fixes/cleanups

Fix/cleanup the driver's tuneproc() and ratemask() methods:

- PPE, IE, and TIME bits need to be cleared beforehand for the slave drive as
  well as master (Alan probably just forgot about it);

- this driver only supports PIO modes up to 4, so must pass the correct limit
  to ide_get_best_pio_mode();

- use min_t() macro instead of min();

- simplify slave vs master drive evaluation;

- do come coding and formatting cleanups...

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 10 insertions, 11 deletions

diff --git a/drivers/ide/pci/piix.c b/drivers/ide/pci/piix.c
index 236d8fd4e72b..52cfc2ac22c1 100644
--- a/drivers/ide/pci/piix.c
+++ b/drivers/ide/pci/piix.c
@@ -1,5 +1,5 @@
 /*
- *  linux/drivers/ide/pci/piix.c        Version 0.45    May 12, 2006
+ *  linux/drivers/ide/pci/piix.c        Version 0.46    December 3, 2006
  *
  *  Copyright (C) 1998-1999 Andrzej Krzysztofowicz, Author and Maintainer
  *  Copyright (C) 1998-2000 Andre Hedrick <andre@linux-ide.org>
@@ -163,7 +163,7 @@ static u8 piix_ratemask (ide_drive_t *drive)
          *      if the drive cannot see an 80pin cable.
          */
         if (!eighty_ninty_three(drive))
-                mode = min(mode, (u8)1);
+                mode = min_t(u8, mode, 1);
         return mode;
 }
 
@@ -216,7 +216,7 @@ static void piix_tune_drive (ide_drive_t *drive, u8 pio)
 {
         ide_hwif_t *hwif        = HWIF(drive);
         struct pci_dev *dev     = hwif->pci_dev;
-        int is_slave            = (&hwif->drives[1] == drive);
+        int is_slave            = drive->dn & 1;
         int master_port         = hwif->channel ? 0x42 : 0x40;
         int slave_port          = 0x44;
         unsigned long flags;
@@ -225,7 +225,7 @@ static void piix_tune_drive (ide_drive_t *drive, u8 pio)
         static DEFINE_SPINLOCK(tune_lock);
         int control = 0;
 
-                                 /* ISP  RTC */
+                                     /* ISP  RTC */
         static const u8 timings[][2]= {
                                         { 0, 0 },
                                         { 0, 0 },
@@ -233,7 +233,7 @@ static void piix_tune_drive (ide_drive_t *drive, u8 pio)
                                         { 2, 1 },
                                         { 2, 3 }, };
 
-        pio = ide_get_best_pio_mode(drive, pio, 5, NULL);
+        pio = ide_get_best_pio_mode(drive, pio, 4, NULL);
 
         /*
          * Master vs slave is synchronized above us but the slave register is
@@ -243,25 +243,24 @@ static void piix_tune_drive (ide_drive_t *drive, u8 pio)
         spin_lock_irqsave(&tune_lock, flags);
         pci_read_config_word(dev, master_port, &master_data);
 
-        if (pio >= 2)
+        if (pio > 1)
                 control |= 1;   /* Programmable timing on */
         if (drive->media == ide_disk)
                 control |= 4;   /* Prefetch, post write */
-        if (pio >= 3)
+        if (pio > 2)
                 control |= 2;   /* IORDY */
         if (is_slave) {
-                master_data = master_data | 0x4000;
+                master_data |=  0x4000;
+                master_data &= ~0x0070;
                 if (pio > 1) {
                         /* enable PPE, IE and TIME */
                         master_data = master_data | (control << 4);
-                } else {
-                        master_data &= ~0x0070;
                 }
                 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));
         } else {
-                master_data = master_data & 0xccf8;
+                master_data &= ~0x3307;
                 if (pio > 1) {
                         /* enable PPE, IE and TIME */
                         master_data = master_data | control;