From 15ce09432a4399e61b57f2ceb564522d6534c15f Mon Sep 17 00:00:00 2001
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Date: Fri, 25 May 2007 20:50:24 +0100
Subject: pata_sis: FIFO whack

If you are using a SiS controller and the BIOS didn't set it up then the
FIFO may be left active when we try and set up the CD. Not convinced this
matters but I'd prefer to be safe

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
---
 drivers/ata/pata_sis.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/ata/pata_sis.c b/drivers/ata/pata_sis.c
index 2b4508206a6..657b1ee2f5c 100644
--- a/drivers/ata/pata_sis.c
+++ b/drivers/ata/pata_sis.c
@@ -149,6 +149,9 @@ static int sis_pre_reset(struct ata_port *ap, unsigned long deadline)
 	if (!pci_test_config_bits(pdev, &sis_enable_bits[ap->port_no]))
 		return -ENOENT;
 
+	/* Clear the FIFO settings. We can't enable the FIFO until
+	   we know we are poking at a disk */
+	pci_write_config_byte(pdev, 0x4B, 0);
 	return ata_std_prereset(ap, deadline);
 }
 
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