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Commit 3c8567d1 authored by Mitchel Humpherys's avatar Mitchel Humpherys Committed by Will Deacon
Browse files

iommu/arm-smmu: don't touch the secure STLBIALL register 



Currently we do a STLBIALL when we initialize the SMMU.  However, in
some configurations that register is not supposed to be touched and is
marked as "Secure only" in the spec.  Rip it out.

Signed-off-by: default avatarMitchel Humpherys <mitchelh@codeaurora.org>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 518f7136

drivers/iommu/arm-smmu.c

+0 −2
Original line number Diff line number Diff line
@@ -127,7 +127,6 @@ 
#define ID2_PTFS_64K			(1 << 14)



/* Global TLB invalidation */

#define ARM_SMMU_GR0_STLBIALL		0x60

#define ARM_SMMU_GR0_TLBIVMID		0x64

#define ARM_SMMU_GR0_TLBIALLNSNH	0x68

#define ARM_SMMU_GR0_TLBIALLH		0x6c
@@ -1414,7 +1413,6 @@ static void arm_smmu_device_reset(struct arm_smmu_device *smmu) 
	}



	/* Invalidate the TLB, just in case */

	writel_relaxed(0, gr0_base + ARM_SMMU_GR0_STLBIALL);

	writel_relaxed(0, gr0_base + ARM_SMMU_GR0_TLBIALLH);

	writel_relaxed(0, gr0_base + ARM_SMMU_GR0_TLBIALLNSNH);