linux-kernel - [PATCH] iommu/arm-smmu-qcom: Restore ACTLR settings for MDSS on sa8775p

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Message-Id: <20260109204551.845959-1-bibek.patro@oss.qualcomm.com>
Date: Sat, 10 Jan 2026 02:15:51 +0530
From: bibek.patro@....qualcomm.com
To: will@...nel.org
Cc: bibek.patro@....qualcomm.com, catalin.marinas@....com,
        charan.kalla@....qualcomm.com, dmitry.baryshkov@....qualcomm.com,
        iommu@...ts.linux.dev, joro@...tes.org, kernel-team@...roid.com,
        konrad.dybcio@....qualcomm.com, linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        robin.clark@....qualcomm.com, robin.murphy@....com
Subject: [PATCH] iommu/arm-smmu-qcom: Restore ACTLR settings for MDSS on sa8775p

From: Bibek Kumar Patro <bibek.patro@....qualcomm.com>

The ACTLR configuration for the sa8775p MDSS client was inadvertently
dropped while reworking the commit f91879fdf70b ("iommu/arm-smmu-qcom:
Add actlr settings for mdss on Qualcomm platforms"). Without this
entry, the sa8775p MDSS block does not receive the intended default
ACTLR configuration.

Restore the missing compatible entry so that the platform receives the
expected behavior.

Signed-off-by: Bibek Kumar Patro <bibek.patro@....qualcomm.com>
---
 drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
index 456d5146831e..718d102356d9 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
@@ -43,6 +43,8 @@ static const struct of_device_id qcom_smmu_actlr_client_of_match[] = {
 			.data = (const void *) (PREFETCH_DEEP | CPRE | CMTLB) },
 	{ .compatible = "qcom,qcm2290-mdss",
 			.data = (const void *) (PREFETCH_SHALLOW | CPRE | CMTLB) },
+	{ .compatible = "qcom,sa8775p-mdss",
+			.data = (const void *) (PREFETCH_DEFAULT | CMTLB) },
 	{ .compatible = "qcom,sc7280-mdss",
 			.data = (const void *) (PREFETCH_SHALLOW | CPRE | CMTLB) },
 	{ .compatible = "qcom,sc7280-venus",
--
2.34.1