Hi Nicolas,
Am 04.11.19 um 14:54 schrieb Nicolas Saenz Julienne:
> 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@xxxxxxx>
do you want this in Linux 5.5 via devicetree/fixes? In this case please
add an fixes tag.
Otherwise this will be queued for Linux 5.6.
> ---
> arch/arm/boot/dts/bcm2711-rpi-4-b.dts | 19 +++++++++++++++++++
> 1 file changed, 19 insertions(+)
>
> diff --git a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
> index cccc1ccd19be..3c7833e9005a 100644
> --- a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
> +++ b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
> @@ -19,6 +19,25 @@
> reg = <0 0 0>;
> };
>
> + 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 Raspberry Pi 4 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;
> + };
> + };
> +
i think this is a SoC-specific issue not a board specifc one. Please
move this to bcm2711.dtsi
Thanks
Stefan
> leds {
> act {
> gpios = <&gpio 42 GPIO_ACTIVE_HIGH>;
