linux-kernel - Re: [PATCH v3 4/4] arm64: dts/sdm845: Enable FW implemented safe sequence handler on MTP

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Message-ID: <20190805222627.GA2634@builder>
Date:   Mon, 5 Aug 2019 15:26:27 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Vivek Gautam <vivek.gautam@...eaurora.org>
Cc:     agross@...nel.org, robh+dt@...nel.org, will.deacon@....com,
        robin.murphy@....com, joro@...tes.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        david.brown@...aro.org
Subject: Re: [PATCH v3 4/4] arm64: dts/sdm845: Enable FW implemented safe
 sequence handler on MTP

On Wed 12 Jun 00:15 PDT 2019, Vivek Gautam wrote:

> Indicate on MTP SDM845 that firmware implements handler to
> TLB invalidate erratum SCM call where SAFE sequence is toggled
> to achieve optimum performance on real-time clients, such as
> display and camera.
> 
> Signed-off-by: Vivek Gautam <vivek.gautam@...eaurora.org>
> ---
>  arch/arm64/boot/dts/qcom/sdm845.dtsi | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> index 78ec373a2b18..6a73d9744a71 100644
> --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> @@ -2368,6 +2368,7 @@
>  			compatible = "qcom,sdm845-smmu-500", "arm,mmu-500";
>  			reg = <0 0x15000000 0 0x80000>;
>  			#iommu-cells = <2>;
> +			qcom,smmu-500-fw-impl-safe-errata;

Looked back at this series and started to wonder if there there is a
case where this should not be set? I mean we're after all adding this to
the top 845 dtsi...

How about making it the default in the driver and opt out of the errata
once there is a need?

Regards,
Bjorn

>  			#global-interrupts = <1>;
>  			interrupts = <GIC_SPI 65 IRQ_TYPE_LEVEL_HIGH>,
>  				     <GIC_SPI 96 IRQ_TYPE_LEVEL_HIGH>,
> -- 
> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
> of Code Aurora Forum, hosted by The Linux Foundation
>