pata_hpt37x: fix HPT370 DMA timeouts

upstream commit: 265b7215aed36941620b65ecfff516200fb190c1

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>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>

diff --git a/drivers/ata/pata_hpt37x.c b/drivers/ata/pata_hpt37x.c
index 42163998de9a423f037ca5c0a6706421213bdcdf..233a5fdf9a8880b2ba63272d4470511f2225449d 100644 (file)
--- a/drivers/ata/pata_hpt37x.c
+++ b/drivers/ata/pata_hpt37x.c
@@ -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,