linux-kernel - [PATCH 05/20] pata_efar: always program master_data before slave

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Date:	Tue, 08 Feb 2011 13:24:09 +0100
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	linux-ide@...r.kernel.org
Cc:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 05/20] pata_efar: always program master_data before slave_data

>From 8acc9371550ce5f98da56f6888ae4b898096ed2c Mon Sep 17 00:00:00 2001
From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Date: Tue, 8 Feb 2011 12:39:25 +0100
Subject: [PATCH 05/20] pata_efar: always program master_data before slave_data

We may need to set SITRE before programming slave_data.

This makes pata_efar match the behavior of IDE's slc90e66 host driver
and also of libata's ata_piix one.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
---
 drivers/ata/pata_efar.c |    9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/ata/pata_efar.c b/drivers/ata/pata_efar.c
index 1e2ff7d..7f564d7 100644
--- a/drivers/ata/pata_efar.c
+++ b/drivers/ata/pata_efar.c
@@ -74,10 +74,12 @@ static void efar_set_timings(struct ata_port *ap, struct ata_device *adev,
 			     u8 pio, bool use_mwdma)
 {
 	struct pci_dev *dev	= to_pci_dev(ap->host->dev);
+	unsigned int is_slave	= (adev->devno != 0);
 	unsigned long flags;
 	u8 master_port		= ap->port_no ? 0x42 : 0x40;
 	u16 master_data;
 	u8 udma_enable;
+	u8 slave_data;
 	int control = 0;
 
 	/*
@@ -110,14 +112,13 @@ static void efar_set_timings(struct ata_port *ap, struct ata_device *adev,
 	pci_read_config_word(dev, master_port, &master_data);
 
 	/* Set PPE, IE, and TIME as appropriate */
-	if (adev->devno == 0) {
+	if (is_slave == 0) {
 		master_data &= 0xCCF0;
 		master_data |= control;
 		master_data |= (timings[pio][0] << 12) |
 			(timings[pio][1] << 8);
 	} else {
 		int shift = 4 * ap->port_no;
-		u8 slave_data;
 
 		master_data &= 0xFF0F;
 		master_data |= (control << 4);
@@ -126,12 +127,14 @@ static void efar_set_timings(struct ata_port *ap, struct ata_device *adev,
 		pci_read_config_byte(dev, 0x44, &slave_data);
 		slave_data &= ap->port_no ? 0x0F : 0xF0;
 		slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << shift;
-		pci_write_config_byte(dev, 0x44, slave_data);
 	}
 
 	master_data |= 0x4000;	/* Ensure SITRE is set */
 	pci_write_config_word(dev, master_port, master_data);
 
+	if (is_slave)
+		pci_write_config_byte(dev, 0x44, slave_data);
+
 	pci_read_config_byte(dev, 0x48, &udma_enable);
 	udma_enable &= ~(1 << (2 * ap->port_no + adev->devno));
 	pci_write_config_byte(dev, 0x48, udma_enable);
-- 
1.7.1

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