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authorBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2009-10-06 16:46:05 +0200
committerDavid S. Miller <davem@davemloft.net>2009-10-07 13:07:17 +0200
commite13ee546bb06453939014c7b854e77fb643fd6f1 (patch)
tree6d4730e7c379565b8015513a91715ae30c6367ef /drivers/ide/sis5513.c
parentRevert "ide: try to use PIO Mode 0 during probe if possible" (diff)
downloadlinux-e13ee546bb06453939014c7b854e77fb643fd6f1.tar.xz
linux-e13ee546bb06453939014c7b854e77fb643fd6f1.zip
sis5513: fix PIO setup for ATAPI devices
Clear prefetch setting before potentially (re-)enabling it in config_drive_art_rwp() so the transition of the device type on the port from ATA to ATAPI (i.e. during warm-plug operation) is handled correctly. This is a really old bug (it probably goes back to very early days of the driver) but it was only affecting warm-plug operation until the recent "ide: try to use PIO Mode 0 during probe if possible" change (commit 6029336426a2b43e4bc6f4a84be8789a047d139e). Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Tested-by: David Fries <david@fries.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/ide/sis5513.c')
-rw-r--r--drivers/ide/sis5513.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/ide/sis5513.c b/drivers/ide/sis5513.c
index afca22beaadf..3b88eba04c9c 100644
--- a/drivers/ide/sis5513.c
+++ b/drivers/ide/sis5513.c
@@ -2,7 +2,7 @@
* Copyright (C) 1999-2000 Andre Hedrick <andre@linux-ide.org>
* Copyright (C) 2002 Lionel Bouton <Lionel.Bouton@inet6.fr>, Maintainer
* Copyright (C) 2003 Vojtech Pavlik <vojtech@suse.cz>
- * Copyright (C) 2007 Bartlomiej Zolnierkiewicz
+ * Copyright (C) 2007-2009 Bartlomiej Zolnierkiewicz
*
* May be copied or modified under the terms of the GNU General Public License
*
@@ -281,11 +281,13 @@ static void config_drive_art_rwp(ide_drive_t *drive)
pci_read_config_byte(dev, 0x4b, &reg4bh);
+ rw_prefetch = reg4bh & ~(0x11 << drive->dn);
+
if (drive->media == ide_disk)
- rw_prefetch = 0x11 << drive->dn;
+ rw_prefetch |= 0x11 << drive->dn;
- if ((reg4bh & (0x11 << drive->dn)) != rw_prefetch)
- pci_write_config_byte(dev, 0x4b, reg4bh|rw_prefetch);
+ if (reg4bh != rw_prefetch)
+ pci_write_config_byte(dev, 0x4b, rw_prefetch);
}
static void sis_set_pio_mode(ide_drive_t *drive, const u8 pio)