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

[Dmitry Baryshkov]

On Mon, 8 Dec 2025 at 21:28, Bibek Kumar Patro
<bibek.patro at oss.qualcomm.com> wrote:
>
>
>
> On 12/6/2025 2:36 AM, Bjorn Andersson wrote:
> > 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:"
> >
>
> Sure Bjorn, I will address this in v4 RESEND and collect all reviewed-by
> tags.
> Let me know if you feel this change needs a revision update to v5
> instead of v4-RESEND.

RESEND means that there were no changes to the patches. If you've
changed anything, it is a next iteration.

>
> Thanks & regards,
> Bibek
>
> > 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 at 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 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
> >>
> >>
>


-- 
With best wishes
Dmitry