diff options
| author | Nicolas Saenz Julienne <nsaenzjulienne@suse.de> | 2019-11-06 10:59:44 +0100 |
|---|---|---|
| committer | Florian Fainelli <f.fainelli@gmail.com> | 2019-11-14 12:33:48 -0800 |
| commit | d98a8dbdaec628f5c993cc711ba9ab98fe909f0f (patch) | |
| tree | 4cbfa3a45810e5e3da8cc50070781f44d8ba50d6 /arch/arm | |
| parent | 4c365e231bd1d3bbe2bdbc2a0c4e413ffb365b20 (diff) | |
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: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Acked-by: Stefan Wahren <wahrenst@gmx.net>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/boot/dts/bcm2711.dtsi | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/arm/boot/dts/bcm2711.dtsi b/arch/arm/boot/dts/bcm2711.dtsi index ac83dac2e6ba..34d24fe272e2 100644 --- a/arch/arm/boot/dts/bcm2711.dtsi +++ b/arch/arm/boot/dts/bcm2711.dtsi @@ -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: |