diff options
| author | Jens Axboe <jens.axboe@oracle.com> | 2008-08-27 15:23:18 +0200 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@redhat.com> | 2008-10-31 01:45:06 -0400 |
| commit | 9ce8e3073d9cfd6f859c22a25441db41b85cbf6e (patch) | |
| tree | 81ddeb3d7203677b541b132b4ed8a909137d7ccf | |
| parent | b9d5b89b487517cbd4cb4702da829e07ef9e4432 (diff) | |
libata: add whitelist for devices with known good pata-sata bridges
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>
| -rw-r--r-- | drivers/ata/libata-core.c | 7 | ||||
| -rw-r--r-- | include/linux/libata.h | 1 |
2 files changed, 8 insertions, 0 deletions
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index 8824c8da3f2f..82af7011f2dd 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -2158,6 +2158,10 @@ retry: static inline u8 ata_dev_knobble(struct ata_device *dev) { struct ata_port *ap = dev->link->ap; + + if (ata_dev_blacklisted(dev) & ATA_HORKAGE_BRIDGE_OK) + return 0; + return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id))); } @@ -4062,6 +4066,9 @@ static const struct ata_blacklist_entry ata_device_blacklist [] = { { "TSSTcorp CDDVDW SH-S202N", "SB00", ATA_HORKAGE_IVB, }, { "TSSTcorp CDDVDW SH-S202N", "SB01", ATA_HORKAGE_IVB, }, + /* Devices that do not need bridging limits applied */ + { "MTRON MSP-SATA*", NULL, ATA_HORKAGE_BRIDGE_OK, }, + /* End Marker */ { } }; diff --git a/include/linux/libata.h b/include/linux/libata.h index 507f53ef8038..f5441edee55f 100644 --- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -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 */ |