scsi: aacraid: Preserve MSIX mode in the OMR register

Preserve the current MSIX mode value in the OMR before rewriting the OMR
to initiate the IOP or Soft Reset.

Signed-off-by: Prasad B Munirathnam <prasad.munirathnam@microsemi.com>
Signed-off-by: Raghava Aditya Renukunta <RaghavaAditya.Renukunta@microsemi.com>
Reviewed-by: Dave Carroll <david.carroll@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/aacraid/src.c b/drivers/scsi/aacraid/src.c
index de48845..09b82d3 100644 (file)
--- a/drivers/scsi/aacraid/src.c
+++ b/drivers/scsi/aacraid/src.c
@@ -680,6 +680,25 @@ void aac_set_intx_mode(struct aac_dev *dev)
        }
 }
 
+static void aac_clear_omr(struct aac_dev *dev)
+{
+       u32 omr_value = 0;
+
+       omr_value = src_readl(dev, MUnit.OMR);
+
+       /*
+        * Check for PCI Errors or Kernel Panic
+        */
+       if ((omr_value == INVALID_OMR) || (omr_value & KERNEL_PANIC))
+               omr_value = 0;
+
+       /*
+        * Preserve MSIX Value if any
+        */
+       src_writel(dev, MUnit.OMR, omr_value & AAC_INT_MODE_MSIX);
+       src_readl(dev, MUnit.OMR);
+}
+
 static void aac_dump_fw_fib_iop_reset(struct aac_dev *dev)
 {
        __le32 supported_options3;
@@ -740,6 +759,8 @@ static void aac_send_iop_reset(struct aac_dev *dev)
 
        aac_set_intx_mode(dev);
 
+       aac_clear_omr(dev);
+
        src_writel(dev, MUnit.IDR, IOP_SRC_RESET_MASK);
 
        msleep(5000);
@@ -749,6 +770,7 @@ static void aac_send_hardware_soft_reset(struct aac_dev *dev)
 {
        u_int32_t val;
 
+       aac_clear_omr(dev);
        val = readl(((char *)(dev->base) + IBW_SWR_OFFSET));
        val |= 0x01;
        writel(val, ((char *)(dev->base) + IBW_SWR_OFFSET));