iommu/arm-smmu-qcom: record reason for deferring probe

To avoid deferring probe smmu driver silently, record reason for it.
It can be checked through ../debugfs/devices_deferred as well:
/sys/kernel/debug# cat devices_deferred
15000000.iommu  arm-smmu: qcom_scm not ready

Signed-off-by: Zhenhua Huang <quic_zhenhuah@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/1719910870-25079-1-git-send-email-quic_zhenhuah@quicinc.com
Signed-off-by: Will Deacon <will@kernel.org>

diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
index 25f034677f5683f4ee58283fdc817c792cb26db3..971c6a2e592b9f15f747d27cb27a021d54b1486c 100644 (file)
--- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
@@ -469,7 +469,8 @@ static struct arm_smmu_device *qcom_smmu_create(struct arm_smmu_device *smmu,
 
        /* Check to make sure qcom_scm has finished probing */
        if (!qcom_scm_is_available())
-               return ERR_PTR(-EPROBE_DEFER);
+               return ERR_PTR(dev_err_probe(smmu->dev, -EPROBE_DEFER,
+                       "qcom_scm not ready\n"));
 
        qsmmu = devm_krealloc(smmu->dev, smmu, sizeof(*qsmmu), GFP_KERNEL);
        if (!qsmmu)