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ARM: dts: bcm2711: force CMA into first GB of memory

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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: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Acked-by: Stefan Wahren <wahrenst@gmx.net>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
This commit is contained in:
Nicolas Saenz Julienne 2019-11-06 10:59:44 +01:00 committed by Florian Fainelli
parent 4c365e231b
commit d98a8dbdae
1 changed files with 20 additions and 0 deletions
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20
arch/arm/boot/dts/bcm2711.dtsi
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@ -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: