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authorTejun Heo <htejun@gmail.com>2008-05-19 01:15:13 +0900
committerJeff Garzik <jgarzik@redhat.com>2008-05-19 17:51:48 -0400
commit906c1ff44a81aaad96a9feb40ea13d73bbf3662a (patch)
tree20a9f5bd6ae04853aba2ab2f68d94134c6bea450 /drivers/ata/sata_sil24.c
parent391191c116c088edc6794a6e5ace10a13928c2f6 (diff)
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.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/ata/sata_sil24.c b/drivers/ata/sata_sil24.c
index 27a11011007..8ee6b5b4ede 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,