Re: [PATCH v2 07/15] ARM: dts: increase default cma size to 40MB

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On Mon, Apr 23, 2018 at 02:47:42PM +0100, Rui Miguel Silva wrote:
> To support camera in i.MX7 the cma heap is used to allocate frame buffers. The
> default size of CMA is 16MB which is not enough for higher resolutions (ex:
> 1600x1200).
> 
> So, increase the default CMA size to 40MB.
> 
> Signed-off-by: Rui Miguel Silva <rui.silva@xxxxxxxxxx>

CMA size can be adjusted by kernel cmdline.  I'm not sure it's necessary
to make it fixed in DT.

Shawn

> ---
>  arch/arm/boot/dts/imx7s.dtsi | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/imx7s.dtsi b/arch/arm/boot/dts/imx7s.dtsi
> index 4d42335c0dee..142ea709d296 100644
> --- a/arch/arm/boot/dts/imx7s.dtsi
> +++ b/arch/arm/boot/dts/imx7s.dtsi
> @@ -182,6 +182,20 @@
>  			     <GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>;
>  	};
>  
> +	reserved-memory {
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		ranges;
> +
> +		/* global autoconfigured region for contiguous allocations */
> +		linux,cma {
> +			compatible = "shared-dma-pool";
> +			reusable;
> +			size = <0x2800000>;
> +			linux,cma-default;
> +		};
> +	};
> +
>  	soc {
>  		#address-cells = <1>;
>  		#size-cells = <1>;
> -- 
> 2.17.0
> 
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