sata_mv new mv_qc_defer method

The EDMA engine cannot tolerate a mix of NCQ/non-NCQ commands,
and cannot be used for PIO at all.  So we need to prevent libata
from trying to feed us such mixtures.

Introduce mv_qc_defer() for this purpose, and use it for all chip versions.

Signed-off-by: Mark Lord <mlord@pobox.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index 6929962..0545a49 100644 (file)
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -492,6 +492,7 @@ static int mv5_scr_read(struct ata_port *ap, unsigned int sc_reg_in, u32 *val);
 static int mv5_scr_write(struct ata_port *ap, unsigned int sc_reg_in, u32 val);
 static int mv_port_start(struct ata_port *ap);
 static void mv_port_stop(struct ata_port *ap);
+static int mv_qc_defer(struct ata_queued_cmd *qc);
 static void mv_qc_prep(struct ata_queued_cmd *qc);
 static void mv_qc_prep_iie(struct ata_queued_cmd *qc);
 static unsigned int mv_qc_issue(struct ata_queued_cmd *qc);
@@ -561,6 +562,7 @@ static struct scsi_host_template mv6_sht = {
 static struct ata_port_operations mv5_ops = {
        .inherits               = &ata_sff_port_ops,
 
+       .qc_defer               = mv_qc_defer,
        .qc_prep                = mv_qc_prep,
        .qc_issue               = mv_qc_issue,
 
@@ -579,7 +581,6 @@ static struct ata_port_operations mv5_ops = {
 
 static struct ata_port_operations mv6_ops = {
        .inherits               = &mv5_ops,
-       .qc_defer               = sata_pmp_qc_defer_cmd_switch,
        .dev_config             = mv6_dev_config,
        .scr_read               = mv_scr_read,
        .scr_write              = mv_scr_write,
@@ -592,7 +593,6 @@ static struct ata_port_operations mv6_ops = {
 
 static struct ata_port_operations mv_iie_ops = {
        .inherits               = &mv6_ops,
-       .qc_defer               = ata_std_qc_defer, /* FIS-based switching */
        .dev_config             = ATA_OP_NULL,
        .qc_prep                = mv_qc_prep_iie,
 };
@@ -1090,6 +1090,45 @@ static void mv6_dev_config(struct ata_device *adev)
        }
 }
 
+static int mv_qc_defer(struct ata_queued_cmd *qc)
+{
+       struct ata_link *link = qc->dev->link;
+       struct ata_port *ap = link->ap;
+       struct mv_port_priv *pp = ap->private_data;
+
+       /*
+        * If the port is completely idle, then allow the new qc.
+        */
+       if (ap->nr_active_links == 0)
+               return 0;
+
+       if (pp->pp_flags & MV_PP_FLAG_EDMA_EN) {
+               /*
+                * The port is operating in host queuing mode (EDMA).
+                * It can accomodate a new qc if the qc protocol
+                * is compatible with the current host queue mode.
+                */
+               if (pp->pp_flags & MV_PP_FLAG_NCQ_EN) {
+                       /*
+                        * The host queue (EDMA) is in NCQ mode.
+                        * If the new qc is also an NCQ command,
+                        * then allow the new qc.
+                        */
+                       if (qc->tf.protocol == ATA_PROT_NCQ)
+                               return 0;
+               } else {
+                       /*
+                        * The host queue (EDMA) is in non-NCQ, DMA mode.
+                        * If the new qc is also a non-NCQ, DMA command,
+                        * then allow the new qc.
+                        */
+                       if (qc->tf.protocol == ATA_PROT_DMA)
+                               return 0;
+               }
+       }
+       return ATA_DEFER_PORT;
+}
+
 static void mv_config_fbs(void __iomem *port_mmio, int enable_fbs)
 {
        u32 old_fiscfg, new_fiscfg, old_ltmode, new_ltmode;