[PATCH 5.10 006/103] iommu/arm-smmu-qcom: Initialize SCTLR of the bypass context
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: 2021-01-15 12:37:44
Also in:
lkml
Subsystem:
arm smmu drivers, iommu subsystem, qualcomm iommu, the rest · Maintainers:
Will Deacon, Joerg Roedel, Rob Clark, Linus Torvalds
From: Bjorn Andersson <redacted>
[ Upstream commit aded8c7c2b72f846a07a2c736b8e75bb8cf50a87 ]
On SM8150 it's occasionally observed that the boot hangs in between the
writing of SMEs and context banks in arm_smmu_device_reset().
The problem seems to coincide with a display refresh happening after
updating the stream mapping, but before clearing - and there by
disabling translation - the context bank picked to emulate translation
bypass.
Resolve this by explicitly disabling the bypass context already in
cfg_probe.
Fixes: f9081b8ff593 ("iommu/arm-smmu-qcom: Implement S2CR quirk")
Signed-off-by: Bjorn Andersson <redacted>
Link: https://lore.kernel.org/r/20210106005038.4152731-1-bjorn.andersson@linaro.org (local)
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
index ef37ccfa82562..0eba5e883e3f1 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c@@ -55,6 +55,8 @@ static int qcom_smmu_cfg_probe(struct arm_smmu_device *smmu) set_bit(qsmmu->bypass_cbndx, smmu->context_map); + arm_smmu_cb_write(smmu, qsmmu->bypass_cbndx, ARM_SMMU_CB_SCTLR, 0); + reg = FIELD_PREP(ARM_SMMU_CBAR_TYPE, CBAR_TYPE_S1_TRANS_S2_BYPASS); arm_smmu_gr1_write(smmu, ARM_SMMU_GR1_CBAR(qsmmu->bypass_cbndx), reg); }
--
2.27.0