diff options
| author | Robert Hancock <hancockr@shaw.ca> | 2007-03-06 02:37:51 -0800 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2007-04-28 14:15:55 -0400 |
| commit | 8343f88999bfcf4c4169e964c8a5c040f40c5a77 (patch) | |
| tree | 674272f1cb350c212fccee01fab2f27b07a9e865 /drivers | |
| parent | f0ef88ed413232daebfe675c7b1bbf100d604d4b (diff) | |
libata: warn if speed limited due to 40-wire cable
Warn the user if a drive's transfer rate is limited because of a 40-wire
cable detection.
Signed-off-by: Robert Hancock <hancockr@shaw.ca>
Cc: Jeff Garzik <jeff@garzik.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/ata/libata-core.c | 33 |
1 files changed, 20 insertions, 13 deletions
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index 99a881558e8..93e7b99d781 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -3425,19 +3425,7 @@ static void ata_dev_xfermask(struct ata_device *dev) xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask, ap->udma_mask); - /* Apply cable rule here. Don't apply it early because when - * we handle hot plug the cable type can itself change. - */ - if (ap->cbl == ATA_CBL_PATA40) - xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA); - /* Apply drive side cable rule. Unknown or 80 pin cables reported - * host side are checked drive side as well. Cases where we know a - * 40wire cable is used safely for 80 are not checked here. - */ - if (ata_drive_40wire(dev->id) && (ap->cbl == ATA_CBL_PATA_UNK || ap->cbl == ATA_CBL_PATA80)) - xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA); - - + /* drive modes available */ xfer_mask &= ata_pack_xfermask(dev->pio_mask, dev->mwdma_mask, dev->udma_mask); xfer_mask &= ata_id_xfermask(dev->id); @@ -3469,6 +3457,25 @@ static void ata_dev_xfermask(struct ata_device *dev) if (ap->ops->mode_filter) xfer_mask = ap->ops->mode_filter(ap, dev, xfer_mask); + /* Apply cable rule here. Don't apply it early because when + * we handle hot plug the cable type can itself change. + * Check this last so that we know if the transfer rate was + * solely limited by the cable. + * Unknown or 80 wire cables reported host side are checked + * drive side as well. Cases where we know a 40wire cable + * is used safely for 80 are not checked here. + */ + if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA)) + /* UDMA/44 or higher would be available */ + if((ap->cbl == ATA_CBL_PATA40) || + (ata_drive_40wire(dev->id) && + (ap->cbl == ATA_CBL_PATA_UNK || + ap->cbl == ATA_CBL_PATA80))) { + ata_dev_printk(dev, KERN_WARNING, + "limited to UDMA/33 due to 40-wire cable\n"); + xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA); + } + ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask, &dev->udma_mask); } |