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libata: implement ATA_HORKAGE_ATAPI_MOD16_DMA and apply it

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libata always uses PIO for ATAPI commands when the number of bytes to
transfer isn't multiple of 16 but quantum DAT72 chokes on odd bytes
PIO transfers.  Implement a horkage to skip the mod16 check and apply
it to the quantum device.

This is reported by John Clark in the following thread.

  http://thread.gmane.org/gmane.linux.ide/34748

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: John Clark <clarkjc@runbox.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Tejun Heo 2008-11-03 19:01:09 +09:00 • committed by Jeff Garzik
parent a464189de3
commit 6a87e42e95
2 changed files with 5 additions and 1 deletions
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2
include/linux/libata.h
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@ -373,6 +373,8 @@ enum {
ATA_HORKAGE_IVB = (1 << 8), /* cbl det validity bit bugs */
ATA_HORKAGE_STUCK_ERR = (1 << 9), /* stuck ERR on next PACKET */
ATA_HORKAGE_BRIDGE_OK = (1 << 10), /* no bridge limits */
ATA_HORKAGE_ATAPI_MOD16_DMA = (1 << 11), /* use ATAPI DMA for commands
not multiple of 16 bytes */
/* DMA mask for user DMA control: User visible values; DO NOT
renumber */