[SCSI] qla2xxx: Enable CRB based doorbell posting for request queue as default for ISP 82xx.

Signed-off-by: NGiridhar Malavali <giridhar.malavali@qlogic.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

drivers/scsi/qla2xxx/qla_nx.c

@@ -3372,11 +3372,16 @@ qla82xx_start_iocbs(srb_t *sp)
 	dbval = 0x04 | (ha->portnum << 5);
 
 	dbval = dbval | (req->id << 8) | (req->ring_index << 16);
-	WRT_REG_DWORD((unsigned long __iomem *)ha->nxdb_wr_ptr, dbval);
-	wmb();
-	while (RD_REG_DWORD(ha->nxdb_rd_ptr) != dbval) {
-		WRT_REG_DWORD((unsigned long  __iomem *)ha->nxdb_wr_ptr, dbval);
+	if (ql2xdbwr)
+		qla82xx_wr_32(ha, ha->nxdb_wr_ptr, dbval);
+	else {
+		WRT_REG_DWORD((unsigned long __iomem *)ha->nxdb_wr_ptr, dbval);
 		wmb();
+		while (RD_REG_DWORD(ha->nxdb_rd_ptr) != dbval) {
+			WRT_REG_DWORD((unsigned long  __iomem *)ha->nxdb_wr_ptr,
+				dbval);
+			wmb();
+		}
 	}
 }
 

drivers/scsi/qla2xxx/qla_os.c

@@ -140,7 +140,7 @@ MODULE_PARM_DESC(ql2xetsenable,
 		"Enables firmware ETS burst."
 		"Default is 0 - skip ETS enablement.");
 
-int ql2xdbwr;
+int ql2xdbwr = 1;
 module_param(ql2xdbwr, int, S_IRUGO|S_IRUSR);
 MODULE_PARM_DESC(ql2xdbwr,
 	"Option to specify scheme for request queue posting\n"