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authorBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2008-06-15 21:00:21 +0200
committerBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2008-06-15 21:00:21 +0200
commit62128b2ca812c1266f4ff7bac068bf0b626c6179 (patch)
tree057f05a7fedf5f7b762d7408ffbe9588732b38e0 /drivers/ide/pci
parent7775c9753b94fe429dc4323360d6502c95e0dd6e (diff)
downloadblackbird-op-linux-62128b2ca812c1266f4ff7bac068bf0b626c6179.tar.gz
blackbird-op-linux-62128b2ca812c1266f4ff7bac068bf0b626c6179.zip
opti621: disable read prefetch
This fixes 2.6.25 regression (kernel.org bugzilla bug #10723) caused by: commit 912fb29a36a7269ac1c4a4df45bc0ac1d2637972 Author: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Date: Fri Oct 19 00:30:11 2007 +0200 opti621: always tune PIO ... Based on a bugreport from Juergen Kosel & inspired by pata_opti.c code. Bisected-by: Juergen Kosel <juergen.kosel@gmx.de> Tested-by: Juergen Kosel <juergen.kosel@gmx.de> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Diffstat (limited to 'drivers/ide/pci')
-rw-r--r--drivers/ide/pci/opti621.c15
1 files changed, 2 insertions, 13 deletions
diff --git a/drivers/ide/pci/opti621.c b/drivers/ide/pci/opti621.c
index 6e99080497bf..e31e0f970a2c 100644
--- a/drivers/ide/pci/opti621.c
+++ b/drivers/ide/pci/opti621.c
@@ -102,18 +102,6 @@
* address: 50 ns, data: 50 ns, recovery: 100 ns.
*/
-/* #define READ_PREFETCH 0 */
-/* Uncomment for disable read prefetch.
- * There is some readprefetch capatibility in hdparm,
- * but when I type hdparm -P 1 /dev/hda, I got errors
- * and till reset drive is inaccessible.
- * This (hw) read prefetch is safe on my drive.
- */
-
-#ifndef READ_PREFETCH
-#define READ_PREFETCH 0x40 /* read prefetch is enabled */
-#endif /* else read prefetch is disabled */
-
#define READ_REG 0 /* index of Read cycle timing register */
#define WRITE_REG 1 /* index of Write cycle timing register */
#define CNTRL_REG 3 /* index of Control register */
@@ -264,7 +252,8 @@ static void opti621_set_pio_mode(ide_drive_t *drive, const u8 pio)
cycle1 = ((first.data_time-1)<<4) | (first.recovery_time-2);
cycle2 = ((second.data_time-1)<<4) | (second.recovery_time-2);
- misc = READ_PREFETCH | ((ax-1)<<4) | ((drdy-2)<<1);
+
+ misc = ((ax - 1) << 4) | ((drdy - 2) << 1);
#ifdef OPTI621_DEBUG
printk("%s: master: address: %d, data: %d, "
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