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iommu/arm-smmu-qcom: apply num_context_bank fixes for SDM630 / SDM660

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The Qualcomm SDM630 / SDM660 platform requires the same kind of
workaround as MSM8998: some IOMMUs have context banks reserved by
firmware / TZ, touching those banks resets the board.

Apply the num_context_bank workaround to those two SMMU devices in order
to allow them to be used by Linux.

Fixes: b812834b53 ("iommu: arm-smmu-qcom: Add sdm630/msm8998 compatibles for qcom quirks")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20240907-sdm660-wifi-v1-1-e316055142f8@linaro.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Dmitry Baryshkov 2024-09-07 21:48:12 +03:00 committed by Will Deacon
parent a2bb820e86
commit 19eb465c96
1 changed files with 13 additions and 1 deletions
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14
drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
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@ -286,8 +286,15 @@ static int qcom_smmu_cfg_probe(struct arm_smmu_device *smmu)
* MSM8998 LPASS SMMU reports 13 context banks, but accessing
* the last context bank crashes the system.
*/
if (of_device_is_compatible(smmu->dev->of_node, "qcom,msm8998-smmu-v2") && smmu->num_context_banks == 13)
if (of_device_is_compatible(smmu->dev->of_node, "qcom,msm8998-smmu-v2") &&
smmu->num_context_banks == 13) {
smmu->num_context_banks = 12;
} else if (of_device_is_compatible(smmu->dev->of_node, "qcom,sdm630-smmu-v2")) {
if (smmu->num_context_banks == 21) /* SDM630 / SDM660 A2NOC SMMU */
smmu->num_context_banks = 7;
else if (smmu->num_context_banks == 14) /* SDM630 / SDM660 LPASS SMMU */
smmu->num_context_banks = 13;
}
/*
* Some platforms support more than the Arm SMMU architected maximum of
@ -350,6 +357,11 @@ static int qcom_adreno_smmuv2_cfg_probe(struct arm_smmu_device *smmu)
/* Support for 16K pages is advertised on some SoCs, but it doesn't seem to work */
smmu->features &= ~ARM_SMMU_FEAT_FMT_AARCH64_16K;
/* TZ protects several last context banks, hide them from Linux */
if (of_device_is_compatible(smmu->dev->of_node, "qcom,sdm630-smmu-v2") &&
smmu->num_context_banks == 5)
smmu->num_context_banks = 2;
return 0;
}