hpt366: MWDMA filter for SATA cards (take 2)

The Marvell bridge chips used on HighPoint SATA cards do not seem to support
the MWDMA modes (at least that could be seen in their so-called drivers :-),
so the driver needs to account for this -- to achieve this:

- add mdma_filter() method from the original patch by Bartlomiej Zolnierkiewicz
  with his consent;

- install the method for all chips to only return empty mask if a SATA drive
  is detected on HPT372{AN]/374 chips...

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

1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/ide/ide-dma.c b/drivers/ide/ide-dma.c
index ff644a5e12cd..097d6e9865bc 100644
--- a/drivers/ide/ide-dma.c
+++ b/drivers/ide/ide-dma.c
@@ -673,8 +673,13 @@ static unsigned int ide_get_mode_mask(ide_drive_t *drive, u8 base)
                         mask &= 0x07;
                 break;
         case XFER_MW_DMA_0:
-                if (id->field_valid & 2)
-                        mask = id->dma_mword & hwif->mwdma_mask;
+                if ((id->field_valid & 2) == 0)
+                        break;
+                if (hwif->mdma_filter)
+                        mask = hwif->mdma_filter(drive);
+                else
+                        mask = hwif->mwdma_mask;
+                mask &= id->dma_mword;
                 break;
         case XFER_SW_DMA_0:
                 if (id->field_valid & 2) {