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authorBrad Campbell <brad@wasp.net.au>2005-05-12 15:07:47 -0400
committerJeff Garzik <jgarzik@pobox.com>2005-05-12 15:07:47 -0400
commit6f2f38128170814e151cfedf79532e19cd179567 (patch)
tree6728b987c6d4199c4d03335407f5b55859b34a86 /drivers/scsi/libata-core.c
parent88d7bd8cb9eb8d64bf7997600b0d64f7834047c5 (diff)
[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: Brad Campbell <brad@wasp.net.au>
Diffstat (limited to 'drivers/scsi/libata-core.c')
-rw-r--r--drivers/scsi/libata-core.c35
1 files changed, 33 insertions, 2 deletions
diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index 0b5d3a5b7eda..8b5a3f00083d 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -1186,6 +1186,37 @@ err_out:
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

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