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, 1 insertions, 4 deletions

diff --git a/drivers/ide/pci/cs5530.c b/drivers/ide/pci/cs5530.c
index 68b5d278ca01..ff909cfb96b6 100644
--- a/drivers/ide/pci/cs5530.c
+++ b/drivers/ide/pci/cs5530.c
@@ -196,10 +196,7 @@ static int cs5530_config_dma (ide_drive_t *drive)
                 outl(timings, basereg + 12);    /* write drive1 config register */
         }
 
-        /*
-         * Finally, turn DMA on in software, and exit.
-         */
-        return hwif->ide_dma_on(drive); /* success */
+        return 0;       /* success */
 }
 
 /**