1 files changed, 25 insertions, 1 deletions

diff --git a/drivers/scsi/mvsas/mv_94xx.c b/drivers/scsi/mvsas/mv_94xx.c
index 3f2ad934c91..e589f31cb2b 100644
--- a/drivers/scsi/mvsas/mv_94xx.c
+++ b/drivers/scsi/mvsas/mv_94xx.c
@@ -475,7 +475,7 @@ static int __devinit mvs_94xx_init(struct mvs_info *mvi)
         tmp = 0;
         mw32(MVS_INT_COAL, tmp);
 
-        tmp = 0x100;
+        tmp = 0x10000 | interrupt_coalescing;
         mw32(MVS_INT_COAL_TMOUT, tmp);
 
         /* ladies and gentlemen, start your engines */
@@ -894,6 +894,29 @@ static void mvs_94xx_clear_srs_irq(struct mvs_info *mvi, u8 reg_set,
 {
 }
 
+static void mvs_94xx_tune_interrupt(struct mvs_info *mvi, u32 time)
+{
+        void __iomem *regs = mvi->regs;
+        u32 tmp = 0;
+        /* interrupt coalescing may cause missing HW interrput in some case,
+         * and the max count is 0x1ff, while our max slot is 0x200,
+         * it will make count 0.
+         */
+        if (time == 0) {
+                mw32(MVS_INT_COAL, 0);
+                mw32(MVS_INT_COAL_TMOUT, 0x10000);
+        } else {
+                if (MVS_CHIP_SLOT_SZ > 0x1ff)
+                        mw32(MVS_INT_COAL, 0x1ff|COAL_EN);
+                else
+                        mw32(MVS_INT_COAL, MVS_CHIP_SLOT_SZ|COAL_EN);
+
+                tmp = 0x10000 | time;
+                mw32(MVS_INT_COAL_TMOUT, tmp);
+        }
+
+}
+
 const struct mvs_dispatch mvs_94xx_dispatch = {
         "mv94xx",
         mvs_94xx_init,
@@ -947,6 +970,7 @@ const struct mvs_dispatch mvs_94xx_dispatch = {
 #ifndef DISABLE_HOTPLUG_DMA_FIX
         mvs_94xx_fix_dma,
 #endif
+        mvs_94xx_tune_interrupt,
         mvs_94xx_non_spec_ncq_error,
 };