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path: root/drivers/ide/ide-dma.c
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Diffstat (limited to 'drivers/ide/ide-dma.c')
-rw-r--r--drivers/ide/ide-dma.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/ide/ide-dma.c b/drivers/ide/ide-dma.c
index 7beaf1e9be12..3cf59f2c3928 100644
--- a/drivers/ide/ide-dma.c
+++ b/drivers/ide/ide-dma.c
@@ -819,6 +819,26 @@ int ide_set_dma(ide_drive_t *drive)
return 0;
}
+void ide_check_dma_crc(ide_drive_t *drive)
+{
+ u8 mode;
+
+ ide_dma_off_quietly(drive);
+ drive->crc_count = 0;
+ mode = drive->current_speed;
+ /*
+ * Don't try non Ultra-DMA modes without iCRC's. Force the
+ * device to PIO and make the user enable SWDMA/MWDMA modes.
+ */
+ if (mode > XFER_UDMA_0 && mode <= XFER_UDMA_7)
+ mode--;
+ else
+ mode = XFER_PIO_4;
+ ide_set_xfer_rate(drive, mode);
+ if (drive->current_speed >= XFER_SW_DMA_0)
+ ide_dma_on(drive);
+}
+
#ifdef CONFIG_BLK_DEV_IDEDMA_PCI
void ide_dma_lost_irq (ide_drive_t *drive)
{