cy82c693: add ->set_dma_mode method

* Fix SWDMA/MWDMA masks in cy82c693_chipset.

* Add IDE_HFLAG_CY82C693 host flag and use it in ide_tune_dma() to
  check whether the DMA should be enabled even if ide_max_dma_mode()
  fails.

* Convert cy82c693_dma_enable() to become cy82c693_set_dma_mode()
  and remove no longer needed cy82c693_ide_dma_on().  Then set
  IDE_HFLAG_CY82C693 instead of IDE_HFLAG_TRUST_BIOS_FOR_DMA in
  cy82c693_chipset.

* Bump driver version.

As a result of this patch cy82c693 driver will configure and use DMA on
all SWDMA0-2 and MWDMA0-2 capable ATA devices instead of relying on BIOS.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 11 insertions, 4 deletions

diff --git a/drivers/ide/ide-dma.c b/drivers/ide/ide-dma.c
index 18c78ad2b31e..9d6dabbbf809 100644
--- a/drivers/ide/ide-dma.c
+++ b/drivers/ide/ide-dma.c
@@ -755,6 +755,7 @@ EXPORT_SYMBOL_GPL(ide_find_dma_mode);
 
 static int ide_tune_dma(ide_drive_t *drive)
 {
+        ide_hwif_t *hwif = drive->hwif;
         u8 speed;
 
         if (noautodma || drive->nodma || (drive->id->capability & 1) == 0)
@@ -767,15 +768,21 @@ static int ide_tune_dma(ide_drive_t *drive)
         if (ide_id_dma_bug(drive))
                 return 0;
 
-        if (drive->hwif->host_flags & IDE_HFLAG_TRUST_BIOS_FOR_DMA)
+        if (hwif->host_flags & IDE_HFLAG_TRUST_BIOS_FOR_DMA)
                 return config_drive_for_dma(drive);
 
         speed = ide_max_dma_mode(drive);
 
-        if (!speed)
-                return 0;
+        if (!speed) {
+                 /* is this really correct/needed? */
+                if ((hwif->host_flags & IDE_HFLAG_CY82C693) &&
+                    ide_dma_good_drive(drive))
+                        return 1;
+                else
+                        return 0;
+        }
 
-        if (drive->hwif->host_flags & IDE_HFLAG_NO_SET_MODE)
+        if (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)
                 return 0;
 
         if (ide_set_dma_mode(drive, speed))