Commit 362ebd83 authored by Albert Lee's avatar Albert Lee Committed by Bartlomiej Zolnierkiewicz

pdc202xx_new: Enable ATAPI DMA

[ 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: default avatarAlbert Lee <>
Signed-off-by: default avatarBartlomiej Zolnierkiewicz <>
parent b43c5f3d
......@@ -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;
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment