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| author | Tejun Heo <htejun@gmail.com> | 2008-05-19 01:15:13 +0900 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@redhat.com> | 2008-05-19 17:51:48 -0400 |
| commit | 906c1ff44a81aaad96a9feb40ea13d73bbf3662a (patch) | |
| tree | 20a9f5bd6ae04853aba2ab2f68d94134c6bea450 /drivers/ata/sata_sil24.c | |
| parent | 391191c116c088edc6794a6e5ace10a13928c2f6 (diff) | |
| download | linux-906c1ff44a81aaad96a9feb40ea13d73bbf3662a.tar.gz linux-906c1ff44a81aaad96a9feb40ea13d73bbf3662a.tar.bz2 linux-906c1ff44a81aaad96a9feb40ea13d73bbf3662a.zip | |
sata_sil24: don't use NCQ if marvell 4140 PMP is attached
When 4140 PMP is attached to sil24, NCQ commands to fan out port 1 and
2 (0 based) often stall if commands are in progress to other ports.
I've tried a number of things but can't tell what's going on. It
never happens w/ ahci and reportedly sata_mv which can issue NCQ
commands to multiple devices simultaneously like sil24 does.
Disable NCQ for devices behind 4140 PMP for the time being.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: Mark Lord <liml@rtr.ca>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/ata/sata_sil24.c')
| -rw-r--r-- | drivers/ata/sata_sil24.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/ata/sata_sil24.c b/drivers/ata/sata_sil24.c index 27a110110077..8ee6b5b4ede7 100644 --- a/drivers/ata/sata_sil24.c +++ b/drivers/ata/sata_sil24.c @@ -899,14 +899,25 @@ static bool sil24_qc_fill_rtf(struct ata_queued_cmd *qc) static void sil24_pmp_attach(struct ata_port *ap) { + u32 *gscr = ap->link.device->gscr; + sil24_config_pmp(ap, 1); sil24_init_port(ap); + + if (sata_pmp_gscr_vendor(gscr) == 0x11ab && + sata_pmp_gscr_devid(gscr) == 0x4140) { + ata_port_printk(ap, KERN_INFO, + "disabling NCQ support due to sil24-mv4140 quirk\n"); + ap->flags &= ~ATA_FLAG_NCQ; + } } static void sil24_pmp_detach(struct ata_port *ap) { sil24_init_port(ap); sil24_config_pmp(ap, 0); + + ap->flags |= ATA_FLAG_NCQ; } static int sil24_pmp_hardreset(struct ata_link *link, unsigned int *class, |