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libata: add whitelist for devices with known good pata-sata bridges

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libata currently imposes a UDMA5 max transfer rate and 200 sector max
transfer size for SATA devices that sit behind a pata-sata bridge. Lots
of devices have known good bridges that don't need this limit applied.
The MTRON SSD disks are such devices. Transfer rates are increased by
20-30% with the restriction removed.

So add a "blacklist" entry for the MTRON devices, with a flag indicating
that the bridge is known good.

Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Jens Axboe 2008-08-27 15:23:18 +02:00 • committed by Jeff Garzik
parent b9d5b89b48
commit 9ce8e3073d
2 changed files with 8 additions and 0 deletions
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1
include/linux/libata.h
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@ -372,6 +372,7 @@ enum {
ATA_HORKAGE_IPM = (1 << 7), /* Link PM problems */
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 */
/* DMA mask for user DMA control: User visible values; DO NOT
renumber */