redonkable/alistair23-linux
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pdc202xx_new: Enable ATAPI DMA

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[ bart: the ressurection of 2 years old patch which slipped thru the cracks
  (thanks to Sergei Shtylyov for finding it) ]

These is the patch to turn on pdc202xx_new for ATAPI DMA.  When testing, it
works fine without the (request_bufflen % 256) workaround as needed in libata.
ide-scsi filters out (pc->request_transfer % 1024) and use PIO, so the pdc202xx
ATAPI DMA problem is avoid.  Both ide-cd and ide-scsi won't hit the ATAPI DMA
problem on pdc202xx_new.

Signed-off-by: Albert Lee <albertcc@tw.ibm.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Albert Lee 2007-03-26 23:03:19 +02:00 committed by Bartlomiej Zolnierkiewicz
parent b43c5f3dbe
commit 362ebd83ad
1 changed files with 2 additions and 1 deletions
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3
drivers/ide/pci/pdc202xx_new.c
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@ -255,7 +255,7 @@ static int config_chipset_for_dma(ide_drive_t *drive)
printk(KERN_WARNING "%s reduced to Ultra33 mode.\n", drive->name);
}
if (drive->media != ide_disk)
if (drive->media != ide_disk && drive->media != ide_cdrom)
return 0;
if (id->capability & 4) {
@ -545,6 +545,7 @@ static void __devinit init_hwif_pdc202new(ide_hwif_t *hwif)
hwif->drives[0].autotune = hwif->drives[1].autotune = 1;
hwif->atapi_dma = 1;
hwif->ultra_mask = 0x7f;
hwif->mwdma_mask = 0x07;