linux-kernel - Re: [PATCH V4] iommu/arm-smmu: add actlr settings for mdss on Qualcomm platforms

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Message-ID: <gsjyj3arwoqcjln6nlmyhohlowyvkwqmxppdq5y7c3m4khoyq3@npzixjpibh5g>
Date: Fri, 5 Dec 2025 15:06:04 -0600
From: Bjorn Andersson <andersson@...nel.org>
To: Charan Teja Kalla <charan.kalla@....qualcomm.com>
Cc: konrad.dybcio@....qualcomm.com, robin.clark@....qualcomm.com, 
	dmitry.baryshkov@....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 V4] iommu/arm-smmu: add actlr settings for mdss on
 Qualcomm platforms

On Tue, Dec 02, 2025 at 06:24:47PM +0530, Charan Teja Kalla wrote:

Based on the other changes to this file, the subject prefix should be
"iommu/arm-smmu-qcom:"

Regards,
Bjorn

> 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.
> 
> Aswell, this prefetch feature is not implemented for all the
> platforms, capturing to those are implemented to the best of my
> knowledge.
> 
> Signed-off-by: Charan Teja Kalla <charan.kalla@....qualcomm.com>
> ---
> Changes from V3:
>  1) Add actlr setting for missing sc8180x & sm6115.
>  2) Improved commit message.
> https://lore.kernel.org/all/20251124171030.323989-1-charan.kalla@oss.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 | 26 ++++++++++++++++++++++
>  1 file changed, 26 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..149da53091de 100644
> --- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
> @@ -41,12 +41,38 @@ 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) },
> +	{ .compatible = "qcom,sc8280xp-mdss",
> +			.data = (const void *) (PREFETCH_SHALLOW | CPRE | CMTLB) },
> +	{ .compatible = "qcom,sm6115-mdss",
> +			.data = (const void *) (PREFETCH_SHALLOW | CPRE | CMTLB) },
> +	{ .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
> 
>