sis5513: clear prefetch and postwrite for ATAPI devices

Clear prefetch and postwrite for ATAPI devices instead of depending on BIOS.

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

1 files changed, 6 insertions, 7 deletions

diff --git a/drivers/ide/pci/sis5513.c b/drivers/ide/pci/sis5513.c
index 45666b45231a..f9117a83fcf0 100644
--- a/drivers/ide/pci/sis5513.c
+++ b/drivers/ide/pci/sis5513.c
@@ -1,5 +1,5 @@
 /*
- * linux/drivers/ide/pci/sis5513.c      Version 0.29    Aug 1, 2007
+ * linux/drivers/ide/pci/sis5513.c      Version 0.30    Aug 9, 2007
  *
  * Copyright (C) 1999-2000      Andre Hedrick <andre@linux-ide.org>
  * Copyright (C) 2002           Lionel Bouton <Lionel.Bouton@inet6.fr>, Maintainer
@@ -522,20 +522,19 @@ static void sis_program_timings(ide_drive_t *drive, const u8 mode)
                 sis_ata133_program_timings(drive, mode);
 }
 
-/* Enables per-drive prefetch and postwrite */
 static void config_drive_art_rwp (ide_drive_t *drive)
 {
         ide_hwif_t *hwif        = HWIF(drive);
         struct pci_dev *dev     = hwif->pci_dev;
-
         u8 reg4bh               = 0;
-        u8 rw_prefetch          = (0x11 << drive->dn);
+        u8 rw_prefetch          = 0;
 
-        if (drive->media != ide_disk)
-                return;
         pci_read_config_byte(dev, 0x4b, &reg4bh);
 
-        if ((reg4bh & rw_prefetch) != rw_prefetch)
+        if (drive->media == ide_disk)
+                rw_prefetch = 0x11 << drive->dn;
+
+        if ((reg4bh & (0x11 << drive->dn)) != rw_prefetch)
                 pci_write_config_byte(dev, 0x4b, reg4bh|rw_prefetch);
 }