linux-kernel - Re: [PATCH v2 2/2] arm64: dts: qcom: sdm845-db845c-navigation-mezzanine: Drop CMA heap

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Message-ID: <8e778221-bec2-437f-b51a-b665ad2ed405@linaro.org>
Date: Thu, 27 Feb 2025 16:04:20 +0000
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Nikita Travkin <nikita@...n.ru>, Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Cc: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
 linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] arm64: dts: qcom:
 sdm845-db845c-navigation-mezzanine: Drop CMA heap

On 27/02/2025 14:26, Nikita Travkin wrote:
> Initially added, the cma heap was supposed to help with libcamera swisp,
> however a mistake was made such that the node was never applied as part
> of the overlay since the change was added to the overlay root ("/") and
> not with a reference to the target dtb root ("&{/}"). Moveover libcamera
> doesn't require CMA heap on Qualcomm platforms anymore as it can now use
> UDMA buffers instead.
> 
> Drop the CMA heap node. This change has no effect on the final dtb.
> 
> This reverts commit d40fd02c1faf8faad57a7579b573bc5be51faabe.
> 
> Fixes: d40fd02c1faf ("arm64: dts: qcom: sdm845-db845c-navigation-mezzanine: Add cma heap for libcamera softisp support")
> Suggested-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
> Signed-off-by: Nikita Travkin <nikita@...n.ru>
> ---
>   .../boot/dts/qcom/sdm845-db845c-navigation-mezzanine.dtso     | 11 -----------
>   1 file changed, 11 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sdm845-db845c-navigation-mezzanine.dtso b/arch/arm64/boot/dts/qcom/sdm845-db845c-navigation-mezzanine.dtso
> index 59970082da45203311146cc5249298f6188bf67a..51f1a4883ab8f0ee7c66fab89c6e1a88c868d2f8 100644
> --- a/arch/arm64/boot/dts/qcom/sdm845-db845c-navigation-mezzanine.dtso
> +++ b/arch/arm64/boot/dts/qcom/sdm845-db845c-navigation-mezzanine.dtso
> @@ -9,17 +9,6 @@
>   #include <dt-bindings/clock/qcom,camcc-sdm845.h>
>   #include <dt-bindings/gpio/gpio.h>
>   
> -/ {
> -	reserved-memory {
> -		linux,cma {
> -			compatible = "shared-dma-pool";
> -			size = <0x0 0x8000000>;
> -			reusable;
> -			linux,cma-default;
> -		};
> -	};
> -};
> -
>   &camss {
>   	vdda-phy-supply = <&vreg_l1a_0p875>;
>   	vdda-pll-supply = <&vreg_l26a_1p2>;
> 
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>