From mboxrd@z Thu Jan 1 00:00:00 1970 From: andreas.herrmann@calxeda.com (Andreas Herrmann) Date: Fri, 27 Sep 2013 00:36:17 +0200 Subject: [PATCH 5/9] iommu/arm-smmu: Clear global and context bank fault status registers In-Reply-To: <1380234982-1677-1-git-send-email-andreas.herrmann@calxeda.com> References: <1380234982-1677-1-git-send-email-andreas.herrmann@calxeda.com> Message-ID: <1380234982-1677-6-git-send-email-andreas.herrmann@calxeda.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org After reset these registers have unknown values. This might cause problems when evaluating SMMU_GFSR and/or SMMU_CB_FSR in handlers for combined interrupts. Signed-off-by: Andreas Herrmann --- drivers/iommu/arm-smmu.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c index de9dd60..9d31ad9 100644 --- a/drivers/iommu/arm-smmu.c +++ b/drivers/iommu/arm-smmu.c @@ -642,6 +642,9 @@ static void arm_smmu_init_context_bank(struct arm_smmu_domain *smmu_domain) stage1 = root_cfg->cbar != CBAR_TYPE_S2_TRANS; cb_base = ARM_SMMU_CB_BASE(smmu) + ARM_SMMU_CB(smmu, root_cfg->cbndx); + /* clear fsr */ + writel_relaxed(0xffffffff, cb_base + ARM_SMMU_CB_FSR); + /* CBAR */ reg = root_cfg->cbar; if (smmu->version == 1) @@ -1564,6 +1567,9 @@ static void arm_smmu_device_reset(struct arm_smmu_device *smmu) int i = 0; u32 scr0 = readl_relaxed(gr0_base + ARM_SMMU_GR0_sCR0); + /* clear global FSRs */ + writel(0xffffffff, gr0_base + ARM_SMMU_GR0_sGFSR); + /* Mark all SMRn as invalid and all S2CRn as bypass */ for (i = 0; i < smmu->num_mapping_groups; ++i) { writel_relaxed(~SMR_VALID, gr0_base + ARM_SMMU_GR0_SMR(i)); -- 1.7.9.5