linux-kernel - Re: [PATCH] arm64: dts: qcom: sc8280xp: Define CMA region for CRD and X13s

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Date:   Fri, 13 Jan 2023 14:16:58 -0600
From:   Andrew Halaney <ahalaney@...hat.com>
To:     Bjorn Andersson <quic_bjorande@...cinc.com>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Johan Hovold <johan@...nel.org>
Subject: Re: [PATCH] arm64: dts: qcom: sc8280xp: Define CMA region for CRD
 and X13s

On Thu, Jan 12, 2023 at 08:10:25PM -0800, Bjorn Andersson wrote:
> Booting the CRD needs roughly 64MB CMA, rather than relying on people
> adding boot parameters etc define a region for this, to remove the
> allocation errors from e.g. NVME.
> 
> While fixing the CRD define the same region for the X13s.
> 
> Signed-off-by: Bjorn Andersson <quic_bjorande@...cinc.com>

Tested-by: Andrew Halaney <ahalaney@...hat.com> # sc8280xp-lenovo-thinkpad-x13s

I'm not sure if I've seen this issue in the past, but booting with this
applied isn't showing any obvious problems like described in the commit.
It would be nice as Konrad said to be a little more explicit about what
you were seeing without this, but that's my personal opinion.

> ---
>  arch/arm64/boot/dts/qcom/sc8280xp-crd.dts                | 9 +++++++++
>  .../boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts      | 9 +++++++++
>  2 files changed, 18 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc8280xp-crd.dts b/arch/arm64/boot/dts/qcom/sc8280xp-crd.dts
> index b29c02307839..e30a37c73b90 100644
> --- a/arch/arm64/boot/dts/qcom/sc8280xp-crd.dts
> +++ b/arch/arm64/boot/dts/qcom/sc8280xp-crd.dts
> @@ -128,6 +128,15 @@ vreg_wwan: regulator-wwan {
>  
>  		regulator-boot-on;
>  	};
> +
> +	reserved-memory {
> +		linux,cma {
> +			compatible = "shared-dma-pool";
> +			size = <0x0 0x8000000>;
> +			reusable;
> +			linux,cma-default;
> +		};
> +	};
>  };
>  
>  &apps_rsc {
> diff --git a/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts b/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
> index 78e61a8184c5..5bfd1f0b2a24 100644
> --- a/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
> +++ b/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
> @@ -153,6 +153,15 @@ vreg_wwan: regulator-wwan {
>  		regulator-boot-on;
>  	};
>  
> +	reserved-memory {
> +		linux,cma {
> +			compatible = "shared-dma-pool";
> +			size = <0x0 0x8000000>;
> +			reusable;
> +			linux,cma-default;
> +		};
> +	};
> +
>  	thermal-zones {
>  		skin-temp-thermal {
>  			polling-delay-passive = <250>;
> -- 
> 2.37.3
>