The bytes indicating current DMA mode in the identify data words 62, 63, and 88
should only change on setting a DMA mode, so stop clearing them on setting PIO
mode in ide_config_drive_speed(). While at it, correct SW/MW DMA mode masks...
Signed-off-by: Sergei Shtylyov <sshtylyov@xxxxxxxxxxxxx>
---
This patch is against the recent Linus' tree...
drivers/ide/ide-iops.c | 8 +++++---
1 files changed, 5 insertions(+), 3 deletions(-)
Index: linux-2.6/drivers/ide/ide-iops.c
===================================================================
--- linux-2.6.orig/drivers/ide/ide-iops.c
+++ linux-2.6/drivers/ide/ide-iops.c
@@ -774,9 +774,11 @@ int ide_config_drive_speed(ide_drive_t *
return error;
}
- id[ATA_ID_UDMA_MODES] &= ~0xFF00;
- id[ATA_ID_MWDMA_MODES] &= ~0x0F00;
- id[ATA_ID_SWDMA_MODES] &= ~0x0F00;
+ if (speed >= XFER_SW_DMA_0) {
+ id[ATA_ID_UDMA_MODES] &= ~0xFF00;
+ id[ATA_ID_MWDMA_MODES] &= ~0x0700;
+ id[ATA_ID_SWDMA_MODES] &= ~0x0700;
+ }
skip:
#ifdef CONFIG_BLK_DEV_IDEDMA
--
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