Commit d98a8dbd authored by Nicolas Saenz Julienne's avatar Nicolas Saenz Julienne Committed by Florian Fainelli
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ARM: dts: bcm2711: force CMA into first GB of memory 



arm64 places the CMA in ZONE_DMA32, which is not good enough for the
Raspberry Pi 4 since it contains peripherals that can only address the
first GB of memory. Explicitly place the CMA into that area.

Signed-off-by: default avatarNicolas Saenz Julienne <nsaenzjulienne@suse.de>
Acked-by: default avatarStefan Wahren <wahrenst@gmx.net>
Signed-off-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
parent 4c365e23

arch/arm/boot/dts/bcm2711.dtsi

+20 −0
Original line number Diff line number Diff line
@@ -12,6 +12,26 @@ 


	interrupt-parent = <&gicv2>;



	reserved-memory {

		#address-cells = <2>;

		#size-cells = <1>;

		ranges;



		/*

		 * arm64 reserves the CMA by default somewhere in ZONE_DMA32,

		 * that's not good enough for the BCM2711 as some devices can

		 * only address the lower 1G of memory (ZONE_DMA).

		 */

		linux,cma {

			compatible = "shared-dma-pool";

			size = <0x2000000>; /* 32MB */

			alloc-ranges = <0x0 0x00000000 0x40000000>;

			reusable;

			linux,cma-default;

		};

	};





	soc {

		/*

		 * Defined ranges: