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ide: remove ide_auto_reduce_xfer()

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While at it:

* Remove needless '!drive->crc_count' check.

Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2008-02-02 19:56:47 +01:00
parent 99ffbe0e97
commit 296921a4ca
1 changed files with 13 additions and 28 deletions
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41
drivers/ide/ide-iops.c
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@ -612,33 +612,6 @@ u8 eighty_ninty_three (ide_drive_t *drive)
return 0;
}
#ifdef CONFIG_BLK_DEV_IDEDMA
static u8 ide_auto_reduce_xfer (ide_drive_t *drive)
{
if (!drive->crc_count)
return drive->current_speed;
drive->crc_count = 0;
switch(drive->current_speed) {
case XFER_UDMA_7: return XFER_UDMA_6;
case XFER_UDMA_6: return XFER_UDMA_5;
case XFER_UDMA_5: return XFER_UDMA_4;
case XFER_UDMA_4: return XFER_UDMA_3;
case XFER_UDMA_3: return XFER_UDMA_2;
case XFER_UDMA_2: return XFER_UDMA_1;
case XFER_UDMA_1: return XFER_UDMA_0;
/*
* OOPS we do not goto non Ultra DMA modes
* without iCRC's available we force
* the system to PIO and make the user
* invoke the ATA-1 ATA-2 DMA modes.
*/
case XFER_UDMA_0:
default: return XFER_PIO_4;
}
}
#endif /* CONFIG_BLK_DEV_IDEDMA */
int ide_driveid_update(ide_drive_t *drive)
{
ide_hwif_t *hwif = drive->hwif;
@ -968,8 +941,20 @@ static ide_startstop_t reset_pollfunc (ide_drive_t *drive)
static void check_dma_crc(ide_drive_t *drive)
{
#ifdef CONFIG_BLK_DEV_IDEDMA
u8 mode;
ide_dma_off_quietly(drive);
ide_set_xfer_rate(drive, ide_auto_reduce_xfer(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);
#endif