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authorBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2007-07-09 23:17:57 +0200
committerBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2007-07-09 23:17:57 +0200
commit15a4f943e729d8ba215ee551df6d7988ba14ac00 (patch)
tree16c115fc64919b905f928066d354a4008b231356 /drivers/ide
parentecea57309e826c8aed020e4dae92b368f2eda2a5 (diff)
downloadop-kernel-dev-15a4f943e729d8ba215ee551df6d7988ba14ac00.zip
op-kernel-dev-15a4f943e729d8ba215ee551df6d7988ba14ac00.tar.gz
ide: fix pre-EIDE SWDMA support
If the word 62 is not defined use the word 52 to get SWDMA mask in ide_get_mode_mask(). Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Diffstat (limited to 'drivers/ide')
-rw-r--r--drivers/ide/ide-dma.c16
1 files changed, 15 insertions, 1 deletions
diff --git a/drivers/ide/ide-dma.c b/drivers/ide/ide-dma.c
index 85db8e8..e8c6e1e 100644
--- a/drivers/ide/ide-dma.c
+++ b/drivers/ide/ide-dma.c
@@ -702,8 +702,22 @@ static unsigned int ide_get_mode_mask(ide_drive_t *drive, u8 base)
mask = id->dma_mword & hwif->mwdma_mask;
break;
case XFER_SW_DMA_0:
- if (id->field_valid & 2)
+ if (id->field_valid & 2) {
mask = id->dma_1word & hwif->swdma_mask;
+ } else if (id->tDMA) {
+ /*
+ * ide_fix_driveid() doesn't convert ->tDMA to the
+ * CPU endianness so we need to do it here
+ */
+ u8 mode = le16_to_cpu(id->tDMA);
+
+ /*
+ * if the mode is valid convert it to the mask
+ * (the maximum allowed mode is XFER_SW_DMA_2)
+ */
+ if (mode <= 2)
+ mask = ((2 << mode) - 1) & hwif->swdma_mask;
+ }
break;
default:
BUG();
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