ide: add ide_tune_dma() helper

After reworking the code responsible for selecting the best DMA
transfer mode it is now possible to add generic ide_tune_dma() helper.

Convert some IDE PCI host drivers to use it (the ones left need more work).

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

1 files changed, 1 insertions, 25 deletions

diff --git a/drivers/ide/pci/piix.c b/drivers/ide/pci/piix.c
index 84d3938a430a..8b219dd63024 100644
--- a/drivers/ide/pci/piix.c
+++ b/drivers/ide/pci/piix.c
@@ -304,30 +304,6 @@ static int piix_tune_chipset (ide_drive_t *drive, u8 xferspeed)
 }
 
 /**
- *      piix_config_drive_for_dma       -       configure drive for DMA
- *      @drive: IDE drive to configure
- *
- *      Set up a PIIX interface channel for the best available speed.
- *      We prefer UDMA if it is available and then MWDMA.  If DMA is
- *      not available we switch to PIO and return 0.
- */
- 
-static int piix_config_drive_for_dma (ide_drive_t *drive)
-{
-        u8 speed = ide_max_dma_mode(drive);
-
-        /*
-         * If no DMA speed was available or the chipset has DMA bugs
-         * then disable DMA and use PIO
-         */
-        if (!speed)
-                return 0;
-
-        (void) piix_tune_chipset(drive, speed);
-        return ide_dma_enable(drive);
-}
-
-/**
  *      piix_config_drive_xfer_rate     -       set up an IDE device
  *      @drive: IDE drive to configure
  *
@@ -339,7 +315,7 @@ static int piix_config_drive_xfer_rate (ide_drive_t *drive)
 {
         drive->init_speed = 0;
 
-        if (ide_use_dma(drive) && piix_config_drive_for_dma(drive))
+        if (ide_tune_dma(drive))
                 return 0;
 
         if (ide_use_fast_pio(drive))