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

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Message-ID: <CAOMZO5B32Cn6qa3Zqe437pqTZ77bpCVMMtzhH3xzj06x5G5MQA@mail.gmail.com>
Date: Tue, 27 Aug 2024 11:32:10 -0300
From: Fabio Estevam <festevam@...il.com>
To: Alexander Stein <alexander.stein@...tq-group.com>
Cc: 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>, 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

Hi Alexander,

On Tue, Aug 27, 2024 at 11:25 AM Alexander Stein
<alexander.stein@...tq-group.com> wrote:
>
> Default CMA size is too small for HDMI output and VPU usage. Increase the
> default size by providing a CMA memory area.
....
> +               linux,cma {
> +                       compatible = "shared-dma-pool";
> +                       reusable;
> +                       size = <0x14000000>;

Just curious: how did you calculate that this is a suitable CMA memory
area size?