[PATCH 1/2] sis5513: fix PIO setup for ATAPI devices

[Bartlomiej Zolnierkiewicz]

From: Bartlomiej Zolnierkiewicz <bzolnier@xxxxxxxxx>
Subject: [PATCH] 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@xxxxxxxxx>
Cc: David S. Miller <davem@xxxxxxxxxxxxx>
Cc: Joao Ramos <joao.ramos@xxxxxxx>
Cc: David Fries <david@xxxxxxxxx>
Cc: d.stussy@xxxxxxxxx
Cc: stable@xxxxxxxxxx
---
Oh, if you're curious pata_sis doesn't have the bug but the fix
was never backported for some unknown reasons..

 drivers/ide/sis5513.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Index: b/drivers/ide/sis5513.c
===================================================================
--- a/drivers/ide/sis5513.c
+++ b/drivers/ide/sis5513.c
@@ -2,7 +2,7 @@
  * Copyright (C) 1999-2000	Andre Hedrick <andre@xxxxxxxxxxxxx>
  * Copyright (C) 2002		Lionel Bouton <Lionel.Bouton@xxxxxxxx>, Maintainer
  * Copyright (C) 2003		Vojtech Pavlik <vojtech@xxxxxxx>
- * 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
  *
@@ -281,6 +281,8 @@ static void config_drive_art_rwp(ide_dri
 
 	pci_read_config_byte(dev, 0x4b, &reg4bh);
 
+	reg4bh &= ~(0x11 << drive->dn);
+
 	if (drive->media == ide_disk)
 		rw_prefetch = 0x11 << drive->dn;
 
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