linux-kernel - [PATCH 39/86] pata_it8213: fix wrong MWDMA timings being programmed

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Message-Id: <20091125170658.5446.74178.sendpatchset@localhost>
Date:	Wed, 25 Nov 2009 18:06:58 +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 39/86] pata_it8213: fix wrong MWDMA timings being programmed

From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Subject: [PATCH] pata_it8213: fix wrong MWDMA timings being programmed

Clear old MWDMA timings before programming new ones (IT8213
is a single port host so there is no need to check ap->port_no).

This change should be safe as this is how we have been doing
things in IDE it8213 host driver for years.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
---
 drivers/ata/pata_it8213.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: b/drivers/ata/pata_it8213.c
===================================================================
--- a/drivers/ata/pata_it8213.c
+++ b/drivers/ata/pata_it8213.c
@@ -211,7 +211,7 @@ static void it8213_set_dmamode (struct a
 			master_data &= 0xFF4F;  /* Mask out IORDY|TIME1|DMAONLY */
 			master_data |= control << 4;
 			pci_read_config_byte(dev, 0x44, &slave_data);
-			slave_data &= (0x0F + 0xE1 * ap->port_no);
+			slave_data &= 0xF0;
 			/* Load the matching timing */
 			slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << (ap->port_no ? 4 : 0);
 			pci_write_config_byte(dev, 0x44, slave_data);
--
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