ide: remove ->ide_dma_check (take 2)

* Add IDE_HFLAG_TRUST_BIOS_FOR_DMA host flag for host drivers that depend
  on BIOS for programming device/controller for DMA.  Set it in cy82c693,
  generic, ns87415, opti621 and trm290 host drivers.

* Add IDE_HFLAG_VDMA host flag for host drivers using VDMA.  Set it in cs5520
  host driver.

* Teach ide_tune_dma() about IDE_HFLAG_TRUST_BIOS_FOR_DMA flag.

* Add generic ide_dma_check() helper and remove all open coded ->ide_dma_check
  implementations.  Fix all places checking for presence of ->ide_dma_check
  hook to check for ->ide_dma_on instead.

* Remove no longer needed code from config_drive_for_dma().

* Make ide_tune_dma() static.

v2:
* Fix config_drive_for_dma() return values.

* Fix ide-dma.c build for CONFIG_BLK_DEV_IDEDMA_PCI=n by adding
  dummy config_drive_for_dma() inline.

* Fix IDE_HFLAG_TRUST_BIOS_FOR_DMA handling in ide_dma_check().

* Fix init_hwif_it8213() comment.

There should be no functionality changes caused by this patch.

Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 0 insertions, 19 deletions

diff --git a/drivers/ide/pci/via82cxxx.c b/drivers/ide/pci/via82cxxx.c
index 479e49661032..c199f88c420f 100644
--- a/drivers/ide/pci/via82cxxx.c
+++ b/drivers/ide/pci/via82cxxx.c
@@ -197,24 +197,6 @@ static void via_set_pio_mode(ide_drive_t *drive, const u8 pio)
         via_set_drive(drive, XFER_PIO_0 + pio);
 }
 
-/**
- *      via82cxxx_ide_dma_check         -       set up for DMA if possible
- *      @drive: IDE drive to set up
- *
- *      Set up the drive for the highest supported speed considering the
- *      driver, controller and cable
- */
- 
-static int via82cxxx_ide_dma_check (ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
 static struct via_isa_bridge *via_config_find(struct pci_dev **isa)
 {
         struct via_isa_bridge *via_config;
@@ -473,7 +455,6 @@ static void __devinit init_hwif_via82cxxx(ide_hwif_t *hwif)
         if (hwif->cbl != ATA_CBL_PATA40_SHORT)
                 hwif->cbl = via82cxxx_cable_detect(hwif);
 
-        hwif->ide_dma_check = &via82cxxx_ide_dma_check;
         if (!noautodma)
                 hwif->autodma = 1;
         hwif->drives[0].autodma = hwif->autodma;