linux-kernel - Re: [PATCH V3] iommu/arm-smmu: add actlr settings for mdss on Qualcomm platforms

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Message-ID: <6zyysrrq6mt447s6rg5sk5vy5w7ulzub4u5m24xw3xo7edguwu@73vtynhdp7nx>
Date: Wed, 26 Nov 2025 03:51:32 +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 V3] iommu/arm-smmu: add actlr settings for mdss on
 Qualcomm platforms

On Mon, Nov 24, 2025 at 10:40:30PM +0530, Charan Teja Kalla wrote:
> Add ACTLR settings for missing MDSS devices on Qualcomm platforms.
> 
> These are QoS settings and are specific to per SoC thus different
> settings, eg: some have shallow prefetch while others have no
> prefetch.
> 
> Signed-off-by: Charan Teja Kalla <charan.kalla@....qualcomm.com>
> ---
> Changes from V2:
>  1) Add actlr settings for all the mdss devices on Qualcomm platforms.
>  2) Improved the commit message that explain why different ACTLR
>     settings
> https://lore.kernel.org/lkml/20251118171822.3539062-1-charan.kalla@oss.qualcomm.com/#t
> 
> Changes 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 | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
> 
> diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
> index c21a401c71eb..ead1a59d40ae 100644
> --- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
> @@ -41,12 +41,34 @@ 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,qcm2290-mdss",
> +			.data = (const void *) (PREFETCH_SHALLOW | CPRE | CMTLB) },
>  	{ .compatible = "qcom,sc7280-mdss",
>  			.data = (const void *) (PREFETCH_SHALLOW | CPRE | CMTLB) },
>  	{ .compatible = "qcom,sc7280-venus",
>  			.data = (const void *) (PREFETCH_SHALLOW | CPRE | CMTLB) },
> +	{ .compatible = "qcom,sc8180x-mdss",
> +			.data = (const void *) (PREFETCH_SHALLOW | CPRE | CMTLB) },

sc8280xp? sm6115?  sdm845? sdm660, msm8998?

> +	{ .compatible = "qcom,sm6125-mdss",
> +			.data = (const void *) (PREFETCH_SHALLOW | CPRE | CMTLB) },
> +	{ .compatible = "qcom,sm6350-mdss",
> +			.data = (const void *) (PREFETCH_SHALLOW | CPRE | CMTLB) },
> +	{ .compatible = "qcom,sm8150-mdss",
> +			.data = (const void *) (PREFETCH_SHALLOW | CPRE | CMTLB) },
> +	{ .compatible = "qcom,sm8250-mdss",
> +			.data = (const void *) (PREFETCH_SHALLOW | CPRE | CMTLB) },
> +	{ .compatible = "qcom,sm8350-mdss",
> +			.data = (const void *) (PREFETCH_SHALLOW | CPRE | CMTLB) },
> +	{ .compatible = "qcom,sm8450-mdss",
> +			.data = (const void *) (PREFETCH_DEFAULT | CMTLB) },
>  	{ .compatible = "qcom,sm8550-mdss",
>  			.data = (const void *) (PREFETCH_DEFAULT | CMTLB) },
> +	{ .compatible = "qcom,sm8650-mdss",
> +			.data = (const void *) (PREFETCH_DEFAULT | CMTLB) },
> +	{ .compatible = "qcom,sm8750-mdss",
> +			.data = (const void *) (PREFETCH_DEFAULT | CMTLB) },
> +	{ .compatible = "qcom,x1e80100-mdss",
> +			.data = (const void *) (PREFETCH_DEFAULT | CMTLB) },
>  	{ }
>  };
>  
> -- 
> 2.34.1
> 

-- 
With best wishes
Dmitry