linux-kernel - [PATCH 3/7] alim15x3: skip DMA initialization completely on revs

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Message-Id: <200803082231.10085.bzolnier@gmail.com>
Date:	Sat, 8 Mar 2008 22:31:09 +0100
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	linux-ide@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 3/7] alim15x3: skip DMA initialization completely on revs < 0x20

Skip DMA initialization completely on revs < 0x20 by setting IDE_HFLAG_NO_DMA
host flag and resetting DMA host masks in alim15x3_init_one() (currently
ide_hwif_setup_dma() will try to obtain DMA base and setup PCI bus-mastering
but init_dma_ali15x3() will fail).

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
---
 drivers/ide/pci/alim15x3.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Index: b/drivers/ide/pci/alim15x3.c
===================================================================
--- a/drivers/ide/pci/alim15x3.c
+++ b/drivers/ide/pci/alim15x3.c
@@ -732,8 +732,6 @@ static void __devinit init_hwif_ali15x3 
 
 static void __devinit init_dma_ali15x3 (ide_hwif_t *hwif, unsigned long dmabase)
 {
-	if (m5229_revision < 0x20)
-		return;
 	if (!hwif->channel)
 		outb(inb(dmabase + 2) & 0x60, dmabase + 2);
 	ide_setup_dma(hwif, dmabase);
@@ -794,6 +792,10 @@ static int __devinit alim15x3_init_one(s
 			d.udma_mask = ATA_UDMA5;
 		else
 			d.udma_mask = ATA_UDMA6;
+	} else {
+		d.host_flags |= IDE_HFLAG_NO_DMA;
+
+		d.mwdma_mask = d.swdma_mask = 0;
 	}
 
 	if (idx == 0)
--
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