Hi Bart,
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.
Changes:
- Turn on ATAPI DMA for pdc202xx_new
Attached please find the patch against the ide-2.6 tree for your review.
Thanks.
Albert
Signed-off-by: Albert Lee <[EMAIL PROTECTED]>
-------
diff -Nru libata-dev-2.6-hwauto/drivers/ide/pci/pdc202xx_new.c
libata-dev-2.6-atapidma/drivers/ide/pci/pdc202xx_new.c
--- libata-dev-2.6-hwauto/drivers/ide/pci/pdc202xx_new.c 2005-03-07
18:19:06.000000000 +0800
+++ libata-dev-2.6-atapidma/drivers/ide/pci/pdc202xx_new.c 2005-03-08
18:34:23.000000000 +0800
@@ -290,7 +290,8 @@
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) { /* IORDY_EN & PREFETCH_EN */
@@ -633,6 +634,7 @@
hwif->drives[0].autotune = hwif->drives[1].autotune = 1;
+ hwif->atapi_dma = 1;
hwif->ultra_mask = 0x7f;
hwif->mwdma_mask = 0x07;
-
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