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authorSergei Shtylyov <sshtylyov@ru.mvista.com>2007-11-27 21:35:52 +0100
committerBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2007-11-27 21:35:52 +0100
commit89613e667f7539defb053795f18653003179cf7e (patch)
tree3efcfc63e7b7e999db536955464c361f1e53cb4d /drivers/ide
parenta1d85864d30181a71243193ed01d322dc0618dc6 (diff)
ide: don't set PIO mode on pre-EIDE drives
Fix handling of the PIO modes for the pre-EIDE drives that did not support the PIO Flow Control Transfer Mode value (00001 nnn) of the Set Transfer Mode feature by skipping the actual mode programming. Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Diffstat (limited to 'drivers/ide')
-rw-r--r--drivers/ide/ide-iops.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/ide/ide-iops.c b/drivers/ide/ide-iops.c
index e17a9ee120e..1cdf688a542 100644
--- a/drivers/ide/ide-iops.c
+++ b/drivers/ide/ide-iops.c
@@ -756,7 +756,7 @@ int ide_driveid_update(ide_drive_t *drive)
int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
{
ide_hwif_t *hwif = drive->hwif;
- int error;
+ int error = 0;
u8 stat;
// while (HWGROUP(drive)->busy)
@@ -767,6 +767,10 @@ int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
hwif->dma_host_off(drive);
#endif
+ /* Skip setting PIO flow-control modes on pre-EIDE drives */
+ if ((speed & 0xf8) == XFER_PIO_0 && !(drive->id->capability & 0x08))
+ goto skip;
+
/*
* Don't use ide_wait_cmd here - it will
* attempt to set_geometry and recalibrate,
@@ -814,6 +818,7 @@ int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
drive->id->dma_mword &= ~0x0F00;
drive->id->dma_1word &= ~0x0F00;
+ skip:
#ifdef CONFIG_BLK_DEV_IDEDMA
if (speed >= XFER_SW_DMA_0)
hwif->dma_host_on(drive);