1 files changed, 32 insertions, 13 deletions

diff --git a/drivers/parisc/sba_iommu.c b/drivers/parisc/sba_iommu.c
index 42b32ff2fca6..278f325021ee 100644
--- a/drivers/parisc/sba_iommu.c
+++ b/drivers/parisc/sba_iommu.c
@@ -178,6 +178,11 @@ extern struct proc_dir_entry * proc_mckinley_root;
 #define ROPE6_CTL       0x230
 #define ROPE7_CTL       0x238
 
+#define IOC_ROPE0_CFG   0x500   /* pluto only */
+#define   IOC_ROPE_AO     0x10  /* Allow "Relaxed Ordering" */
+
+
+
 #define HF_ENABLE       0x40
 
 
@@ -1759,19 +1764,33 @@ printk("sba_hw_init(): mem_boot 0x%x 0x%x 0x%x 0x%x\n", PAGE0->mem_boot.hpa,
 
         sba_dev->num_ioc = num_ioc;
         for (i = 0; i < num_ioc; i++) {
-                /*
-                ** Make sure the box crashes if we get any errors on a rope.
-                */
-                WRITE_REG(HF_ENABLE, sba_dev->ioc[i].ioc_hpa + ROPE0_CTL);
-                WRITE_REG(HF_ENABLE, sba_dev->ioc[i].ioc_hpa + ROPE1_CTL);
-                WRITE_REG(HF_ENABLE, sba_dev->ioc[i].ioc_hpa + ROPE2_CTL);
-                WRITE_REG(HF_ENABLE, sba_dev->ioc[i].ioc_hpa + ROPE3_CTL);
-                WRITE_REG(HF_ENABLE, sba_dev->ioc[i].ioc_hpa + ROPE4_CTL);
-                WRITE_REG(HF_ENABLE, sba_dev->ioc[i].ioc_hpa + ROPE5_CTL);
-                WRITE_REG(HF_ENABLE, sba_dev->ioc[i].ioc_hpa + ROPE6_CTL);
-                WRITE_REG(HF_ENABLE, sba_dev->ioc[i].ioc_hpa + ROPE7_CTL);
-
-                /* flush out the writes */
+                unsigned long ioc_hpa = sba_dev->ioc[i].ioc_hpa;
+                unsigned int j;
+
+                for (j=0; j < sizeof(u64) * ROPES_PER_IOC; j+=sizeof(u64)) {
+
+                        /*
+                         * Clear ROPE(N)_CONFIG AO bit.
+                         * Disables "NT Ordering" (~= !"Relaxed Ordering")
+                         * Overrides bit 1 in DMA Hint Sets.
+                         * Improves netperf UDP_STREAM by ~10% for bcm5701.
+                         */
+                        if (IS_PLUTO(sba_dev->iodc)) {
+                                unsigned long rope_cfg, cfg_val;
+
+                                rope_cfg = ioc_hpa + IOC_ROPE0_CFG + j;
+                                cfg_val = READ_REG(rope_cfg);
+                                cfg_val &= ~IOC_ROPE_AO;
+                                WRITE_REG(cfg_val, rope_cfg);
+                        }
+
+                        /*
+                        ** Make sure the box crashes on rope errors.
+                        */
+                        WRITE_REG(HF_ENABLE, ioc_hpa + ROPE0_CTL + j);
+                }
+
+                /* flush out the last writes */
                 READ_REG(sba_dev->ioc[i].ioc_hpa + ROPE7_CTL);
 
                 DBG_INIT("      ioc[%d] ROPE_CFG 0x%Lx  ROPE_DBG 0x%Lx\n",