isci: Disable link layer hang detection

Some targets exceed the hang detect timer.  Use the OS timeout to
catch hung tasks.

Signed-off-by: Jeff Skirvin <jeffrey.d.skirvin@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 2 insertions, 5 deletions

diff --git a/drivers/scsi/isci/phy.c b/drivers/scsi/isci/phy.c
index 784c9a71333a..93a401dfbd30 100644
--- a/drivers/scsi/isci/phy.c
+++ b/drivers/scsi/isci/phy.c
@@ -242,11 +242,8 @@ scic_sds_phy_link_layer_initialization(struct scic_sds_phy *sci_phy,
                         &sci_phy->link_layer_registers->maximum_arbitration_wait_timer_timeout);
         }
 
-        /*
-         * Set the link layer hang detection to 500ms (0x1F4) from its default
-         * value of 128ms.  Max value is 511 ms.
-         */
-        writel(0x1F4, &sci_phy->link_layer_registers->link_layer_hang_detection_timeout);
+        /* Disable link layer hang detection, rely on the OS timeout for I/O timeouts. */
+        writel(0, &sci_phy->link_layer_registers->link_layer_hang_detection_timeout);
 
         /* We can exit the initial state to the stopped state */
         sci_change_state(&sci_phy->sm, SCI_PHY_STOPPED);