linux-kernel - Re: [PATCH] iommu/arm-smmu-qcom: Restore ACTLR settings for MDSS on sa8775p

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Message-ID: <70e88549-5448-4a06-a20f-ad4395eb7350@oss.qualcomm.com>
Date: Fri, 16 Jan 2026 12:02:23 +0530
From: Bibek Kumar Patro <bibek.patro@....qualcomm.com>
To: will@...nel.org
Cc: catalin.marinas@....com, charan.kalla@....qualcomm.com,
        dmitry.baryshkov@....qualcomm.com, iommu@...ts.linux.dev,
        joro@...tes.org, kernel-team@...roid.com,
        konrad.dybcio@....qualcomm.com, linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        robin.clark@....qualcomm.com, robin.murphy@....com
Subject: Re: [PATCH] iommu/arm-smmu-qcom: Restore ACTLR settings for MDSS on
 sa8775p

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@....qualcomm.com wrote:
> From: Bibek Kumar Patro <bibek.patro@....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@....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
>