diff options
| author | Mark Lord <liml@rtr.ca> | 2008-05-19 09:01:24 -0400 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@redhat.com> | 2008-05-19 17:30:28 -0400 |
| commit | 06aaca3f6301d04463b1ee0eb75c0352147159f2 (patch) | |
| tree | e4057424492a9237c736ed216c6df95a03da34ca /drivers/ata | |
| parent | 96e2c487933e5f69e98fffdcae2c35c78a671c07 (diff) | |
sata_mv: ensure empty request queue for FBS-NCQ EH
Check for an empty request queue before stopping EDMA after a FBS-NCQ error,
as per recommendation from the Marvell datasheet.
This ensures that the EDMA won't suddenly become active again
just after our subsequent check of the empty/idle bits.
Also bump DRV_VERSION.
Signed-off-by: Mark Lord <mlord@pobox.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/ata')
| -rw-r--r-- | drivers/ata/sata_mv.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c index 2d8a7e894b7..fb81f0c7a8c 100644 --- a/drivers/ata/sata_mv.c +++ b/drivers/ata/sata_mv.c @@ -72,7 +72,7 @@ #include <linux/libata.h> #define DRV_NAME "sata_mv" -#define DRV_VERSION "1.20" +#define DRV_VERSION "1.21" enum { /* BAR's are enumerated in terms of pci_resource_start() terms */ @@ -1695,6 +1695,18 @@ static void mv_pmp_eh_prep(struct ata_port *ap, unsigned int pmp_map) } } +static int mv_req_q_empty(struct ata_port *ap) +{ + void __iomem *port_mmio = mv_ap_base(ap); + u32 in_ptr, out_ptr; + + in_ptr = (readl(port_mmio + EDMA_REQ_Q_IN_PTR_OFS) + >> EDMA_REQ_Q_PTR_SHIFT) & MV_MAX_Q_DEPTH_MASK; + out_ptr = (readl(port_mmio + EDMA_REQ_Q_OUT_PTR_OFS) + >> EDMA_REQ_Q_PTR_SHIFT) & MV_MAX_Q_DEPTH_MASK; + return (in_ptr == out_ptr); /* 1 == queue_is_empty */ +} + static int mv_handle_fbs_ncq_dev_err(struct ata_port *ap) { struct mv_port_priv *pp = ap->private_data; @@ -1728,7 +1740,7 @@ static int mv_handle_fbs_ncq_dev_err(struct ata_port *ap) ap->qc_active, failed_links, ap->nr_active_links); - if (ap->nr_active_links <= failed_links) { + if (ap->nr_active_links <= failed_links && mv_req_q_empty(ap)) { mv_process_crpb_entries(ap, pp); mv_stop_edma(ap); mv_eh_freeze(ap); |