diff --git a/arch/arm/mach-msm/include/mach/iommu.h b/arch/arm/mach-msm/include/mach/iommu.h
index 296c0f10f230e2005d7be5f78a021dc7cd66cd36..8738a445558863062e0081791fec1b67a011c41e 100644
--- a/arch/arm/mach-msm/include/mach/iommu.h
+++ b/arch/arm/mach-msm/include/mach/iommu.h
@@ -1,4 +1,4 @@
-/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
+/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -19,6 +19,7 @@
 #define MSM_IOMMU_H
 
 #include <linux/interrupt.h>
+#include <linux/clk.h>
 
 /* Sharability attributes of MSM IOMMU mappings */
 #define MSM_IOMMU_ATTR_NON_SH		0x0
@@ -74,13 +75,17 @@ struct msm_iommu_ctx_dev {
  * struct msm_iommu_drvdata - A single IOMMU hardware instance
  * @base:	IOMMU config port base address (VA)
  * @irq:	Interrupt number
-  *
+ * @clk:	The bus clock for this IOMMU hardware instance
+ * @pclk:	The clock for the IOMMU bus interconnect
+ *
  * A msm_iommu_drvdata holds the global driver data about a single piece
  * of an IOMMU hardware instance.
  */
 struct msm_iommu_drvdata {
 	void __iomem *base;
 	int irq;
+	struct clk *clk;
+	struct clk *pclk;
 };
 
 /**
diff --git a/arch/arm/mach-msm/iommu.c b/arch/arm/mach-msm/iommu.c
index e2d58e4cb0d73c47ecb11f62d834114d5e186d41..cde3cd0f8c0c0f05e8e95e59887edcdf2216e0b6 100644
--- a/arch/arm/mach-msm/iommu.c
+++ b/arch/arm/mach-msm/iommu.c
@@ -1,4 +1,4 @@
-/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
+/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -26,6 +26,7 @@
 #include <linux/spinlock.h>
 #include <linux/slab.h>
 #include <linux/iommu.h>
+#include <linux/clk.h>
 
 #include <asm/cacheflush.h>
 #include <asm/sizes.h>
@@ -50,6 +51,30 @@ struct msm_priv {
 	struct list_head list_attached;
 };
 
+static int __enable_clocks(struct msm_iommu_drvdata *drvdata)
+{
+	int ret;
+
+	ret = clk_enable(drvdata->pclk);
+	if (ret)
+		goto fail;
+
+	if (drvdata->clk) {
+		ret = clk_enable(drvdata->clk);
+		if (ret)
+			clk_disable(drvdata->pclk);
+	}
+fail:
+	return ret;
+}
+
+static void __disable_clocks(struct msm_iommu_drvdata *drvdata)
+{
+	if (drvdata->clk)
+		clk_disable(drvdata->clk);
+	clk_disable(drvdata->pclk);
+}
+
 static int __flush_iotlb(struct iommu_domain *domain)
 {
 	struct msm_priv *priv = domain->priv;
@@ -77,9 +102,16 @@ static int __flush_iotlb(struct iommu_domain *domain)
 			BUG();
 
 		iommu_drvdata = dev_get_drvdata(ctx_drvdata->pdev->dev.parent);
+		BUG_ON(!iommu_drvdata);
+
+		ret = __enable_clocks(iommu_drvdata);
+		if (ret)
+			goto fail;
+
 		SET_CTX_TLBIALL(iommu_drvdata->base, ctx_drvdata->num, 0);
+		__disable_clocks(iommu_drvdata);
 	}
-
+fail:
 	return ret;
 }
 
@@ -265,9 +297,14 @@ static int msm_iommu_attach_dev(struct iommu_domain *domain, struct device *dev)
 			goto fail;
 		}
 
+	ret = __enable_clocks(iommu_drvdata);
+	if (ret)
+		goto fail;
+
 	__program_context(iommu_drvdata->base, ctx_dev->num,
 			  __pa(priv->pgtable));
 
+	__disable_clocks(iommu_drvdata);
 	list_add(&(ctx_drvdata->attached_elm), &priv->list_attached);
 	ret = __flush_iotlb(domain);
 
@@ -303,7 +340,12 @@ static void msm_iommu_detach_dev(struct iommu_domain *domain,
 	if (ret)
 		goto fail;
 
+	ret = __enable_clocks(iommu_drvdata);
+	if (ret)
+		goto fail;
+
 	__reset_context(iommu_drvdata->base, ctx_dev->num);
+	__disable_clocks(iommu_drvdata);
 	list_del_init(&ctx_drvdata->attached_elm);
 
 fail:
@@ -532,6 +574,10 @@ static phys_addr_t msm_iommu_iova_to_phys(struct iommu_domain *domain,
 	base = iommu_drvdata->base;
 	ctx = ctx_drvdata->num;
 
+	ret = __enable_clocks(iommu_drvdata);
+	if (ret)
+		goto fail;
+
 	/* Invalidate context TLB */
 	SET_CTX_TLBIALL(base, ctx, 0);
 	SET_V2PPR_VA(base, ctx, va >> V2Pxx_VA_SHIFT);
@@ -547,6 +593,7 @@ static phys_addr_t msm_iommu_iova_to_phys(struct iommu_domain *domain,
 	if (GET_FAULT(base, ctx))
 		ret = 0;
 
+	__disable_clocks(iommu_drvdata);
 fail:
 	spin_unlock_irqrestore(&msm_iommu_lock, flags);
 	return ret;
@@ -590,7 +637,7 @@ irqreturn_t msm_iommu_fault_handler(int irq, void *dev_id)
 	struct msm_iommu_drvdata *drvdata = dev_id;
 	void __iomem *base;
 	unsigned int fsr;
-	int ncb, i;
+	int ncb, i, ret;
 
 	spin_lock(&msm_iommu_lock);
 
@@ -604,6 +651,10 @@ irqreturn_t msm_iommu_fault_handler(int irq, void *dev_id)
 	pr_err("Unexpected IOMMU page fault!\n");
 	pr_err("base = %08x\n", (unsigned int) base);
 
+	ret = __enable_clocks(drvdata);
+	if (ret)
+		goto fail;
+
 	ncb = GET_NCB(base)+1;
 	for (i = 0; i < ncb; i++) {
 		fsr = GET_FSR(base, i);
@@ -614,6 +665,7 @@ irqreturn_t msm_iommu_fault_handler(int irq, void *dev_id)
 			SET_FSR(base, i, 0x4000000F);
 		}
 	}
+	__disable_clocks(drvdata);
 fail:
 	spin_unlock(&msm_iommu_lock);
 	return 0;