linux-kernel - Re: [PATCH V2] iommu/arm-smmu: add actlr settings for mdss on sa8775p platform

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Message-ID: <himyof7napywkc44vre5ncqsatkkaxqnqbhjht6hjt53lakper@4wlwsvxkkamc>
Date: Tue, 18 Nov 2025 20:03:59 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Charan Teja Kalla <charan.kalla@....qualcomm.com>
Cc: konrad.dybcio@....qualcomm.com, robin.clark@....qualcomm.com,
        will@...nel.org, robin.murphy@....com, joro@...tes.org,
        iommu@...ts.linux.dev, linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] iommu/arm-smmu: add actlr settings for mdss on
 sa8775p platform

On Tue, Nov 18, 2025 at 10:48:22PM +0530, Charan Teja Kalla wrote:
> Add ACTLR settings for the mdss device on Qualcomm SA8775P platform.
> This is achieved by adding compatibility string for mdss in the actlr
> client of match table.
> 
> Signed-off-by: Charan Teja Kalla <charan.kalla@....qualcomm.com>
> ---
> 
> Changed from V1:
>   1) Added actlr setting only for MDSS and dropped for fastrpc. -- konrad
>   2) ACTLR table is updated per alphanumeric order -- konrad 
>   https://lore.kernel.org/all/20251105075307.1658329-1-charan.kalla@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 62874b18f645..0b400e22cb00 100644
> --- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
> @@ -41,6 +41,8 @@ static const struct of_device_id qcom_smmu_actlr_client_of_match[] = {
>  			.data = (const void *) (PREFETCH_DEEP | CPRE | CMTLB) },
>  	{ .compatible = "qcom,fastrpc",
>  			.data = (const void *) (PREFETCH_DEEP | CPRE | CMTLB) },
> +	{ .compatible = "qcom,sa8775p-mdss",
> +			.data = (const void *) (PREFETCH_DEFAULT | CMTLB) },

What's the difference from SC7280? Why don't we need to set CPRE?

>  	{ .compatible = "qcom,sc7280-mdss",
>  			.data = (const void *) (PREFETCH_SHALLOW | CPRE | CMTLB) },
>  	{ .compatible = "qcom,sc7280-venus",
> -- 
> 2.34.1
> 

-- 
With best wishes
Dmitry