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| author | Tejun Heo <htejun@gmail.com> | 2006-03-12 11:25:27 +0900 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2006-03-11 21:48:53 -0500 |
| commit | 4b10e559277de490bf5c257a1e3264a2bf51404b (patch) | |
| tree | a9f165b6e57d83b9f702838741b0958c334ba215 /drivers/scsi/ahci.c | |
| parent | 418dc1f5a805822fcf1118804ddc689a4156db4a (diff) | |
| download | lwn-4b10e559277de490bf5c257a1e3264a2bf51404b.tar.gz lwn-4b10e559277de490bf5c257a1e3264a2bf51404b.zip | |
[PATCH] ahci: enable prefetching for PACKET commands
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>
Diffstat (limited to 'drivers/scsi/ahci.c')
| -rw-r--r-- | drivers/scsi/ahci.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/scsi/ahci.c b/drivers/scsi/ahci.c index 00dfdefe2967..e97ab3e6de4d 100644 --- a/drivers/scsi/ahci.c +++ b/drivers/scsi/ahci.c @@ -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); } |