From: Bibek Kumar Patro <bibek.patro@oss.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@oss.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

Hi Will,

Thanks for the clarification in [1].
I’ve sent the follow‑up patch on top, including the explanation in the 
commit message as suggested.
Please lmk if any further adjustment is needed.

https://lore.kernel.org/all/aWDsFoEe7PHQaL9F@willie-the-truck/

Thanks & Regards,
Bibek

On 1/10/2026 2:15 AM, bibek.patro@oss.qualcomm.com wrote:
> From: Bibek Kumar Patro <bibek.patro@oss.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@oss.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
>