linux-kernel - Re: [PATCH 1/1] ARM: dts: imx6qdl: Add reserved memory area for CMA memory

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Message-ID: <10526262.nUPlyArG6x@steina-w>
Date: Wed, 28 Aug 2024 09:49:36 +0200
From: Alexander Stein <alexander.stein@...tq-group.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>, Pengutronix Kernel Team <kernel@...gutronix.de>, Fabio Estevam <festevam@...il.com>
Cc: linux@...tq-group.com, devicetree@...r.kernel.org, imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] ARM: dts: imx6qdl: Add reserved memory area for CMA memory

Am Dienstag, 27. August 2024, 16:24:58 CEST schrieb Alexander Stein:
> Default CMA size is too small for HDMI output and VPU usage. Increase the
> default size by providing a CMA memory area.
> 
> Signed-off-by: Alexander Stein <alexander.stein@...tq-group.com>
> ---
> Smallest RAM variant has 512MiB.
> 
>  arch/arm/boot/dts/nxp/imx/imx6qdl-mba6.dtsi | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/nxp/imx/imx6qdl-mba6.dtsi b/arch/arm/boot/dts/nxp/imx/imx6qdl-mba6.dtsi
> index d03f7065ddfd7..8ba3ec27bee07 100644
> --- a/arch/arm/boot/dts/nxp/imx/imx6qdl-mba6.dtsi
> +++ b/arch/arm/boot/dts/nxp/imx/imx6qdl-mba6.dtsi
> @@ -106,6 +106,20 @@ reg_vcc3v3_audio: regulator-vcc3v3-audio {
>  		vin-supply = <&reg_mba6_3p3v>;
>  	};
>  
> +	reserved-memory {
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		ranges;
> +
> +		linux,cma {
> +			compatible = "shared-dma-pool";
> +			reusable;
> +			size = <0x14000000>;
> +			alloc-ranges = <0x10000000 0x20000000>;
> +			linux,cma-default;
> +		};
> +	};
> +

Please do not merge yet.
I just noticed that this breaks mmap'ed fbdev usage. It only works when CMA
area is in HighMem.

Best regards,
Alexander

>  	sound {
>  		compatible = "fsl,imx-audio-tlv320aic32x4";
>  		pinctrl-names = "default";
> 


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