From: Sergei Shtylyov <sshtylyov@ru.mvista.com>
To: bzolnier@gmail.com
Cc: linux-ide@vger.kernel.org
Subject: [PATCH] ide-iops: only clear DMA words on setting DMA mode
Date: Tue, 10 Mar 2009 23:38:15 +0400 [thread overview]
Message-ID: <200903102238.15619.sshtylyov@ru.mvista.com> (raw)
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@ru.mvista.com>
---
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
next reply other threads:[~2009-03-10 19:37 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-10 19:38 Sergei Shtylyov [this message]
2009-03-11 16:35 ` [PATCH] ide-iops: only clear DMA words on setting DMA mode Bartlomiej Zolnierkiewicz
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