From: AngeloGioacchino Del Regno <kholk11@xxxxxxxxx>
On some Qualcomm SoCs with certain hypervisor configurations,
some context banks are hyp-protected and cannot be disabled,
nor the relative S2CRs can be set as bypass, or a hyp-fault
will be triggered and the system will hang.
This is seen on at least Qualcomm SDM630, SDM636 and SDM660.
Signed-off-by: AngeloGioacchino Del Regno <kholk11@xxxxxxxxx>
---
drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
index b18e70bddf29..364908cc2adf 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
@@ -85,6 +85,18 @@ static int qcom_smmuv2_cfg_probe(struct arm_smmu_device *smmu)
return 0;
}
+static void qcom_smmuv2_stream_mapping_reset(struct arm_smmu_device *smmu)
+{
+ /*
+ * Broken firmware quirk:
+ * On some Qualcomm SoCs with certain hypervisor configurations,
+ * some context banks are hyp-protected and cannot be disabled,
+ * nor the relative S2CRs can be set as bypass, or a hyp-fault
+ * will be triggered and the system will hang.
+ */
+ return;
+}
+
static void qcom_smmuv2_test_smr_masks(struct arm_smmu_device *smmu)
{
/*
@@ -99,6 +111,7 @@ static void qcom_smmuv2_test_smr_masks(struct arm_smmu_device *smmu)
static const struct arm_smmu_impl qcom_smmuv2_impl = {
.cfg_probe = qcom_smmuv2_cfg_probe,
+ .stream_mapping_reset = qcom_smmuv2_stream_mapping_reset,
.test_smr_masks = qcom_smmuv2_test_smr_masks,
};
--
2.28.0
