linux-kernel - [PATCH v2 1/4] ata_piix: SITRE handling fix

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Message-Id: <201110131528.30789.bzolnier@gmail.com>
Date:	Thu, 13 Oct 2011 15:28:30 +0200
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	Jeff Garzik <jgarzik@...ox.com>
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/4] ata_piix: SITRE handling fix

From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Subject: [PATCH v2] ata_piix: SITRE handling fix

Set SITRE (separate slave timing register) bit also in master-only
configurations to match other PIIX-alike drivers and make further
changes easier.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
---
v2: updated patch description

earlier references:
https://lkml.org/lkml/2011/2/8/98

 drivers/ata/ata_piix.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

Index: b/drivers/ata/ata_piix.c
===================================================================
--- a/drivers/ata/ata_piix.c
+++ b/drivers/ata/ata_piix.c
@@ -750,8 +750,6 @@ static void piix_set_timings(struct ata_
 	if (is_slave) {
 		/* clear TIME1|IE1|PPE1|DTE1 */
 		master_data &= 0xff0f;
-		/* Enable SITRE (separate slave timing register) */
-		master_data |= 0x4000;
 		/* enable PPE1, IE1 and TIME1 as needed */
 		master_data |= (control << 4);
 		pci_read_config_byte(dev, slave_port, &slave_data);
@@ -769,6 +767,9 @@ static void piix_set_timings(struct ata_
 			(timings[pio][0] << 12) |
 			(timings[pio][1] << 8);
 	}
+
+	/* Enable SITRE (separate slave timing register) */
+	master_data |= 0x4000;
 	pci_write_config_word(dev, master_port, master_data);
 	if (is_slave)
 		pci_write_config_byte(dev, slave_port, slave_data);
--
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