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Commit 6f2f3812 authored by Brad Campbell's avatar Brad Campbell Committed by Jeff Garzik
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[PATCH] libata basic detection and errata for PATA->SATA bridges 



This patch works around an issue with WD drives (and possibly others)
over SiL PATA->SATA Bridges on SATA controllers locking up with
transfers > 200 sectors.

Signed-off-by: default avatarBrad Campbell <brad@wasp.net.au>
parent 88d7bd8c

drivers/scsi/libata-core.c

+33 −2
Original line number Diff line number Diff line
@@ -1186,6 +1186,37 @@ static void ata_dev_identify(struct ata_port *ap, unsigned int device) 
	DPRINTK("EXIT, err\n");

}





static inline u8 ata_dev_knobble(struct ata_port *ap)

{

	return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(ap->device->id)));

}



/**

 * 	ata_dev_config - Run device specific handlers and check for

 * 			 SATA->PATA bridges

 * 	@ap: Bus 

 * 	@i:  Device

 *

 * 	LOCKING:

 */

 

void ata_dev_config(struct ata_port *ap, unsigned int i)

{

	/* limit bridge transfers to udma5, 200 sectors */

	if (ata_dev_knobble(ap)) {

		printk(KERN_INFO "ata%u(%u): applying bridge limits\n",

			ap->id, ap->device->devno);

		ap->udma_mask &= ATA_UDMA5;

		ap->host->max_sectors = ATA_MAX_SECTORS;

		ap->host->hostt->max_sectors = ATA_MAX_SECTORS;

		ap->device->flags |= ATA_DFLAG_LOCK_SECTORS;

	}



	if (ap->ops->dev_config)

		ap->ops->dev_config(ap, &ap->device[i]);

}



/**

 *	ata_bus_probe - Reset and probe ATA bus

 *	@ap: Bus to probe
@@ -1208,8 +1239,7 @@ static int ata_bus_probe(struct ata_port *ap) 
		ata_dev_identify(ap, i);

		if (ata_dev_present(&ap->device[i])) {

			found = 1;

			if (ap->ops->dev_config)

				ap->ops->dev_config(ap, &ap->device[i]);

			ata_dev_config(ap,i);

		}

	}
@@ -4014,6 +4044,7 @@ EXPORT_SYMBOL_GPL(ata_scsi_release); 
EXPORT_SYMBOL_GPL(ata_host_intr);

EXPORT_SYMBOL_GPL(ata_dev_classify);

EXPORT_SYMBOL_GPL(ata_dev_id_string);

EXPORT_SYMBOL_GPL(ata_dev_config);

EXPORT_SYMBOL_GPL(ata_scsi_simulate);



#ifdef CONFIG_PCI

include/linux/ata.h

+1 −0
Original line number Diff line number Diff line
@@ -224,6 +224,7 @@ struct ata_taskfile { 
};



#define ata_id_is_ata(id)	(((id)[0] & (1 << 15)) == 0)

#define ata_id_is_sata(id)	((id)[93] == 0)

#define ata_id_rahead_enabled(id) ((id)[85] & (1 << 6))

#define ata_id_wcache_enabled(id) ((id)[85] & (1 << 5))

#define ata_id_has_flush(id) ((id)[83] & (1 << 12))

include/linux/libata.h

+1 −0
Original line number Diff line number Diff line
@@ -420,6 +420,7 @@ extern void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg, 
extern unsigned int ata_dev_classify(struct ata_taskfile *tf);

extern void ata_dev_id_string(u16 *id, unsigned char *s,

			      unsigned int ofs, unsigned int len);

extern void ata_dev_config(struct ata_port *ap, unsigned int i);

extern void ata_bmdma_setup (struct ata_queued_cmd *qc);

extern void ata_bmdma_start (struct ata_queued_cmd *qc);

extern void ata_bmdma_stop(struct ata_port *ap);