linux-kernel - Re: [PATCH v5] iommu/arm-smmu-qcom: add actlr settings for mdss on Qualcomm platforms

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Message-ID: <e0ba7db5-a64f-4845-9d12-fe66d1d5d575@oss.qualcomm.com>
Date: Fri, 2 Jan 2026 13:53:36 +0530
From: Bibek Kumar Patro <bibek.patro@....qualcomm.com>
To: konrad.dybcio@....qualcomm.com, robin.clark@....qualcomm.com,
        dmitry.baryshkov@....qualcomm.com, will@...nel.org,
        robin.murphy@....com, joro@...tes.org,
        Bjorn Andersson <andersson@...nel.org>
Cc: iommu@...ts.linux.dev, linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Charan Teja Kalla <charan.kalla@....qualcomm.com>
Subject: Re: [PATCH v5] iommu/arm-smmu-qcom: add actlr settings for mdss on
 Qualcomm platforms

Hi all,

Resurfacing this patch in case it was overlooked due to the holidays and 
Plumbers.
As per Dmitry’s suggestion [1] , I’m sharing the v5 revision, which 
incorporates Bjorn’s feedback on v4.

[1]: 
https://lore.kernel.org/all/CAO9ioeW0fafwRnxvDJ7yHGcQYbgfkfRF1BMTpXpG=8tSKRptdw@mail.gmail.com/#t

Thanks & regards,
Bibek

On 12/9/2025 10:53 AM, bibek.patro@....qualcomm.com wrote:
> From: Charan Teja Kalla <charan.kalla@....qualcomm.com>
> 
> 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.
> 
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
> Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
> Signed-off-by: Charan Teja Kalla <charan.kalla@....qualcomm.com>
> Signed-off-by: Bibek Kumar Patro <bibek.patro@....qualcomm.com>
> ---
> Changes from V4:
>   1) Change subject prefix to "iommu/arm-smmu-qcom:"
>   based on the changes. -- Bjorn
> https://lore.kernel.org/all/20251202125447.2102658-1-charan.kalla@oss.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 57c097e87613..c6645df97bbc 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) },
>   	{ }
>   };
>