ide: add ide_set_dma() helper (v2)

* add ide_set_dma() helper and make ide_hwif_t.ide_dma_check return
  -1 when DMA needs to be disabled (== need to call ->ide_dma_off_quietly)
   0 when DMA needs to be enabled  (== need to call ->ide_dma_on)
   1 when DMA setting shouldn't be changed
* fix IDE code to use ide_set_dma() instead if using ->ide_dma_check directly

v2:
* updated for scc_pata

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

1 files changed, 3 insertions, 5 deletions

diff --git a/drivers/ide/pci/hpt34x.c b/drivers/ide/pci/hpt34x.c
index c65971d8d6ad..924eaa3a5708 100644
--- a/drivers/ide/pci/hpt34x.c
+++ b/drivers/ide/pci/hpt34x.c
@@ -109,21 +109,19 @@ static int config_chipset_for_dma (ide_drive_t *drive)
 
 static int hpt34x_config_drive_xfer_rate (ide_drive_t *drive)
 {
-        ide_hwif_t *hwif        = HWIF(drive);
-
         drive->init_speed = 0;
 
         if (ide_use_dma(drive) && config_chipset_for_dma(drive))
 #ifndef CONFIG_HPT34X_AUTODMA
-                return hwif->ide_dma_off_quietly(drive);
+                return -1;
 #else
-                return hwif->ide_dma_on(drive);
+                return 0;
 #endif
 
         if (ide_use_fast_pio(drive))
                 hpt34x_tune_drive(drive, 255);
 
-        return hwif->ide_dma_off_quietly(drive);
+        return -1;
 }
 
 /*