iommu/arm-smmu: Print message when Cavium erratum 27704 was detected

Firmware is responsible for properly enabling smmu workarounds. Print
a message for better diagnostics when Cavium erratum 27704 was
detected.

Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Robert Richter <rrichter@cavium.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index b493c99..8e16da6 100644 (file)
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1887,6 +1887,7 @@ static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu)
                        atomic_add_return(smmu->num_context_banks,
                                          &cavium_smmu_context_count);
                smmu->cavium_id_base -= smmu->num_context_banks;
+               dev_notice(smmu->dev, "\tenabling workaround for Cavium erratum 27704\n");
        }
 
        /* ID2 */