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[PATCH] ahci: enable prefetching for PACKET commands

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Turn on AHCI_CMD_PREFETCH for PACKET commands.  This hints the
controller that it can prefetch the CDB and the PRD entries.  This
patch is originally from Jeff Garzik.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo 2006-03-12 11:25:27 +09:00 committed by Jeff Garzik
parent 418dc1f5a8
commit 4b10e55927
1 changed files with 2 additions and 1 deletions
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3
drivers/scsi/ahci.c
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@ -66,6 +66,7 @@ enum {
AHCI_IRQ_ON_SG = (1 << 31),
AHCI_CMD_ATAPI = (1 << 5),
AHCI_CMD_WRITE = (1 << 6),
AHCI_CMD_PREFETCH = (1 << 7),
AHCI_CMD_RESET = (1 << 8),
AHCI_CMD_CLR_BUSY = (1 << 10),
@ -631,7 +632,7 @@ static void ahci_qc_prep(struct ata_queued_cmd *qc)
if (qc->tf.flags & ATA_TFLAG_WRITE)
opts |= AHCI_CMD_WRITE;
if (is_atapi)
opts |= AHCI_CMD_ATAPI;
opts |= AHCI_CMD_ATAPI | AHCI_CMD_PREFETCH;
ahci_fill_cmd_slot(pp, opts);
}