From: Stepan Moskovchenko <stepanm@codeaurora.org>
Date: Tue, 1 Mar 2011 00:04:55 +0000 (-0800)
Subject: msm: iommu: Don't read from write-only registers
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=b0e7808d548ea1d857216d31d63078411203a116;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

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.

Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
Signed-off-by: David Brown <davidb@codeaurora.org>
---

diff --git a/arch/arm/mach-msm/include/mach/iommu_hw-8xxx.h b/arch/arm/mach-msm/include/mach/iommu_hw-8xxx.h
index bbd397cff6c8..fc160101dead 100644
--- a/arch/arm/mach-msm/include/mach/iommu_hw-8xxx.h
+++ b/arch/arm/mach-msm/include/mach/iommu_hw-8xxx.h
@@ -625,20 +625,6 @@ 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)
@@ -826,20 +812,6 @@ 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)
diff --git a/arch/arm/mach-msm/iommu.c b/arch/arm/mach-msm/iommu.c
index 0146f519e85c..1a584e077c61 100644
--- a/arch/arm/mach-msm/iommu.c
+++ b/arch/arm/mach-msm/iommu.c
@@ -579,7 +579,7 @@ 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);
 
 	par = GET_PAR(base, ctx);