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pata_hpt37x: fix HPT370 DMA timeouts

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The libata driver has copied the code from the IDE driver which caused a post
2.4.18 regression on many HPT370[A] chips -- DMA stopped to work completely,
only causing timeouts.  Now remove hpt370_bmdma_start() for good...

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Sergei Shtylyov 2009-04-14 18:39:14 +04:00 committed by Jeff Garzik
parent 79b42babba
commit 265b7215ae
1 changed files with 2 additions and 20 deletions
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22
drivers/ata/pata_hpt37x.c
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@ -8,7 +8,7 @@
* Copyright (C) 1999-2003 Andre Hedrick <andre@linux-ide.org>
* Portions Copyright (C) 2001 Sun Microsystems, Inc.
* Portions Copyright (C) 2003 Red Hat Inc
* Portions Copyright (C) 2005-2007 MontaVista Software, Inc.
* Portions Copyright (C) 2005-2009 MontaVista Software, Inc.
*
* TODO
* Look into engine reset on timeout errors. Should not be required.
@ -24,7 +24,7 @@
#include <linux/libata.h>
#define DRV_NAME "pata_hpt37x"
#define DRV_VERSION "0.6.11"
#define DRV_VERSION "0.6.12"
struct hpt_clock {
u8 xfer_speed;
@ -444,23 +444,6 @@ static void hpt370_set_dmamode(struct ata_port *ap, struct ata_device *adev)
pci_write_config_dword(pdev, addr1, reg | mode);
}
/**
* hpt370_bmdma_start - DMA engine begin
* @qc: ATA command
*
* The 370 and 370A want us to reset the DMA engine each time we
* use it. The 372 and later are fine.
*/
static void hpt370_bmdma_start(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
pci_write_config_byte(pdev, 0x50 + 4 * ap->port_no, 0x37);
udelay(10);
ata_bmdma_start(qc);
}
/**
* hpt370_bmdma_end - DMA engine stop
* @qc: ATA command
@ -598,7 +581,6 @@ static struct scsi_host_template hpt37x_sht = {
static struct ata_port_operations hpt370_port_ops = {
.inherits = &ata_bmdma_port_ops,
.bmdma_start = hpt370_bmdma_start,
.bmdma_stop = hpt370_bmdma_stop,
.mode_filter = hpt370_filter,