ide: add IDE_HFLAG_ABUSE_SET_DMA_MODE host flag

* Add IDE_HFLAG_ABUSE_SET_DMA_MODE host flag and use it to decide
  what to do with transfer modes < XFER_PIO_0 in ide_set_xfer_rate().

* Set IDE_HFLAG_ABUSE_SET_DMA_MODE in host drivers that need it
  (aec62xx, amd74xx, cs5520, cs5535, hpt34x, hpt366, pdc202xx_old,
  serverworks, tc86c001 and via82cxxx) and cleanup ->set_dma_mode
  methods in host drivers that don't (IDE core code guarantees that
  ->set_dma_mode will be called only for modes which are present
  in SWDMA/MWDMA/UDMA masks).

While at it:

* Add IDE_HFLAGS_HPT34X/HPT3XX/PDC202XX/SVWKS define in
  hpt34x/hpt366/pdc202xx_old/serverworks host driver.

There should be no functionality changes caused by this patch.

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

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/ide/pci/via82cxxx.c b/drivers/ide/pci/via82cxxx.c
index a0d3c16b68ec..4b32c90f4896 100644
--- a/drivers/ide/pci/via82cxxx.c
+++ b/drivers/ide/pci/via82cxxx.c
@@ -439,6 +439,7 @@ static const struct ide_port_info via82cxxx_chipset __devinitdata = {
         .enablebits     = { { 0x40, 0x02, 0x02 }, { 0x40, 0x01, 0x01 } },
         .host_flags     = IDE_HFLAG_PIO_NO_BLACKLIST |
                           IDE_HFLAG_PIO_NO_DOWNGRADE |
+                          IDE_HFLAG_ABUSE_SET_DMA_MODE |
                           IDE_HFLAG_POST_SET_MODE |
                           IDE_HFLAG_IO_32BIT |
                           IDE_HFLAG_BOOTABLE,