msm: iommu: Don't read from write-only registers

Don't read from V2Pxx command registers when doing
iova-to-phys operations. These registers are write-only and
reading the value before modifying the VA bits is
unnecessary.

Change-Id: I9a92e6300bf369d9422eef0fec7b066a4221f244
Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>

arch/arm/mach-msm/include/mach/iommu_hw-8xxx.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
@@ -607,20 +607,6 @@ do { \
 #define SET_INDEX(b, c, v)	 SET_CONTEXT_FIELD(b, c, V2PSR, INDEX, v)
 
 
-/* V2Pxx UW UR PW PR */
-#define SET_V2PUW_INDEX(b, c, v) SET_CONTEXT_FIELD(b, c, V2PUW, V2Pxx_INDEX, v)
-#define SET_V2PUW_VA(b, c, v)	 SET_CONTEXT_FIELD(b, c, V2PUW, V2Pxx_VA, v)
-
-#define SET_V2PUR_INDEX(b, c, v) SET_CONTEXT_FIELD(b, c, V2PUR, V2Pxx_INDEX, v)
-#define SET_V2PUR_VA(b, c, v)	 SET_CONTEXT_FIELD(b, c, V2PUR, V2Pxx_VA, v)
-
-#define SET_V2PPW_INDEX(b, c, v) SET_CONTEXT_FIELD(b, c, V2PPW, V2Pxx_INDEX, v)
-#define SET_V2PPW_VA(b, c, v)	 SET_CONTEXT_FIELD(b, c, V2PPW, V2Pxx_VA, v)
-
-#define SET_V2PPR_INDEX(b, c, v) SET_CONTEXT_FIELD(b, c, V2PPR, V2Pxx_INDEX, v)
-#define SET_V2PPR_VA(b, c, v)	 SET_CONTEXT_FIELD(b, c, V2PPR, V2Pxx_VA, v)
-
-
 /* Context Register getters */
 /* ACTLR */
 #define GET_CFERE(b, c)	        GET_CONTEXT_FIELD(b, c, ACTLR, CFERE)
@@ -804,20 +790,6 @@ do { \
 #define GET_INDEX(b, c)		GET_CONTEXT_FIELD(b, c, V2PSR, INDEX)
 
 
-/* V2Pxx UW UR PW PR */
-#define GET_V2PUW_INDEX(b, c)	GET_CONTEXT_FIELD(b, c, V2PUW, V2Pxx_INDEX)
-#define GET_V2PUW_VA(b, c)	GET_CONTEXT_FIELD(b, c, V2PUW, V2Pxx_VA)
-
-#define GET_V2PUR_INDEX(b, c)	GET_CONTEXT_FIELD(b, c, V2PUR, V2Pxx_INDEX)
-#define GET_V2PUR_VA(b, c)	GET_CONTEXT_FIELD(b, c, V2PUR, V2Pxx_VA)
-
-#define GET_V2PPW_INDEX(b, c)	GET_CONTEXT_FIELD(b, c, V2PPW, V2Pxx_INDEX)
-#define GET_V2PPW_VA(b, c)	GET_CONTEXT_FIELD(b, c, V2PPW, V2Pxx_VA)
-
-#define GET_V2PPR_INDEX(b, c)	GET_CONTEXT_FIELD(b, c, V2PPR, V2Pxx_INDEX)
-#define GET_V2PPR_VA(b, c)	GET_CONTEXT_FIELD(b, c, V2PPR, V2Pxx_VA)
-
-
 /* Global Registers */
 #define M2VCBR_N	(0xFF000)
 #define CBACR_N		(0xFF800)

arch/arm/mach-msm/iommu.c

@@ -488,7 +488,7 @@ static phys_addr_t msm_iommu_iova_to_phys(struct iommu_domain *domain,
 
 	/* Invalidate context TLB */
 	SET_CTX_TLBIALL(base, ctx, 0);
-	SET_V2PPR_VA(base, ctx, va >> V2Pxx_VA_SHIFT);
+	SET_V2PPR(base, ctx, va & V2Pxx_VA);
 
 	if (GET_FAULT(base, ctx))
 		goto fail;