From: Bjorn Andersson bjorn.andersson@linaro.org
commit 07a7f2caaa5a2619934491bab3c47b261c554fb0 upstream.
The Qualcomm boot loader configures stream mapping for the peripherals that it accesses and in particular it sets up the stream mapping for the display controller to be allowed to scan out a splash screen or EFI framebuffer.
Read back the stream mappings during initialization and make the arm-smmu driver maintain the streams in bypass mode.
Cc: stable@vger.kernel.org Signed-off-by: Bjorn Andersson bjorn.andersson@linaro.org Tested-by: Steev Klimaszewski steev@kali.org Acked-by: Robin Murphy robin.murphy@arm.com Link: https://lore.kernel.org/r/20201019182323.3162386-3-bjorn.andersson@linaro.or... Signed-off-by: Will Deacon will@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+)
--- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c @@ -23,6 +23,28 @@ static const struct of_device_id qcom_sm { } };
+static int qcom_smmu_cfg_probe(struct arm_smmu_device *smmu) +{ + u32 smr; + int i; + + for (i = 0; i < smmu->num_mapping_groups; i++) { + smr = arm_smmu_gr0_read(smmu, ARM_SMMU_GR0_SMR(i)); + + if (FIELD_GET(ARM_SMMU_SMR_VALID, smr)) { + smmu->smrs[i].id = FIELD_GET(ARM_SMMU_SMR_ID, smr); + smmu->smrs[i].mask = FIELD_GET(ARM_SMMU_SMR_MASK, smr); + smmu->smrs[i].valid = true; + + smmu->s2crs[i].type = S2CR_TYPE_BYPASS; + smmu->s2crs[i].privcfg = S2CR_PRIVCFG_DEFAULT; + smmu->s2crs[i].cbndx = 0xff; + } + } + + return 0; +} + static int qcom_smmu_def_domain_type(struct device *dev) { const struct of_device_id *match = @@ -61,6 +83,7 @@ static int qcom_smmu500_reset(struct arm }
static const struct arm_smmu_impl qcom_smmu_impl = { + .cfg_probe = qcom_smmu_cfg_probe, .def_domain_type = qcom_smmu_def_domain_type, .reset = qcom_smmu500_reset, };