Optionally disable QAS in MPT Fusion spi driver

Andrew Patterson
Hewlett-Packard

Index: scsi-misc-2.6/drivers/message/fusion/mptscsih.h
===================================================================
--- scsi-misc-2.6.orig/drivers/message/fusion/mptscsih.h	2006-06-02 12:29:31.000000000 -0600
+++ scsi-misc-2.6/drivers/message/fusion/mptscsih.h	2006-06-02 14:32:07.000000000 -0600
@@ -66,6 +66,7 @@
 #define MPTSCSIH_DOMAIN_VALIDATION      1
 #define MPTSCSIH_MAX_WIDTH              1
 #define MPTSCSIH_MIN_SYNC               0x08
+#define MPTSCSIH_QAS                    1
 #define MPTSCSIH_SAF_TE                 0
 #define MPTSCSIH_PT_CLEAR               0
 
Index: scsi-misc-2.6/drivers/message/fusion/mptspi.c
===================================================================
--- scsi-misc-2.6.orig/drivers/message/fusion/mptspi.c	2006-06-02 12:29:31.000000000 -0600
+++ scsi-misc-2.6/drivers/message/fusion/mptspi.c	2006-06-02 14:32:07.000000000 -0600
@@ -87,6 +87,10 @@ static int mpt_pq_filter = 0;
 module_param(mpt_pq_filter, int, 0);
 MODULE_PARM_DESC(mpt_pq_filter, " Enable peripheral qualifier filter: enable=1  (default=0)");
 
+static int mpt_qas = MPTSCSIH_QAS;
+module_param(mpt_qas, int, 1);
+MODULE_PARM_DESC(mpt_qas, " Quick Arbitration and Selection (QAS) enabled=1, disabled=0 (default=MPTSCSIH_QAS=1)");
+
 static void mptspi_write_offset(struct scsi_target *, int);
 static void mptspi_write_width(struct scsi_target *, int);
 static int mptspi_write_spi_device_pg1(struct scsi_target *,
@@ -607,7 +611,8 @@ static void mptspi_write_qas(struct scsi
 	VirtTarget *vtarget = starget->hostdata;
 	u32 nego;
 
-	if ((vtarget->negoFlags & MPT_TARGET_NO_NEGO_QAS) ||
+	if (!mpt_qas ||
+	    (vtarget->negoFlags & MPT_TARGET_NO_NEGO_QAS) ||
 	    hd->ioc->spi_data.noQas)
 		spi_qas(starget) = 0;
 	else
@@ -989,7 +994,7 @@ mptspi_probe(struct pci_dev *pdev, const
 		ioc->name,
 		mpt_saf_te,
 		mpt_pq_filter));
-	ioc->spi_data.noQas = 0;
+	ioc->spi_data.noQas = mpt_qas ? 0 : MPT_TARGET_NO_NEGO_QAS;
 
 	init_waitqueue_head(&hd->scandv_waitq);
 	hd->scandv_wait_done = 0;