[SCSI] hpsa: allow driver to put controller in either simple or performant mode

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index 4fb62c2aac05..10076f1868e0 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -74,6 +74,10 @@ static int hpsa_allow_any;
 module_param(hpsa_allow_any, int, S_IRUGO|S_IWUSR);
 MODULE_PARM_DESC(hpsa_allow_any,
                 "Allow hpsa driver to access unknown HP Smart Array hardware");
+static int hpsa_simple_mode;
+module_param(hpsa_simple_mode, int, S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(hpsa_simple_mode,
+        "Use 'simple mode' rather than 'performant mode'");
 
 /* define the PCI info for the cards we can control */
 static const struct pci_device_id hpsa_pci_device_id[] = {
@@ -4038,6 +4042,9 @@ static __devinit void hpsa_put_ctlr_into_performant_mode(struct ctlr_info *h)
 {
         u32 trans_support;
 
+        if (hpsa_simple_mode)
+                return;
+
         trans_support = readl(&(h->cfgtable->TransportSupport));
         if (!(trans_support & PERFORMANT_MODE))
                 return;