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Commit 9ce8e307 authored by Jens Axboe's avatar Jens Axboe Committed by Jeff Garzik
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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: default avatarJeff Garzik <jgarzik@redhat.com>
parent b9d5b89b

drivers/ata/libata-core.c

+7 −0
Original line number Diff line number Diff line
@@ -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 */

	{ }

};

include/linux/libata.h

+1 −0
Original line number Diff line number Diff line
@@ -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 */