diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0419-ARM-dts-bcm2711-force-CMA-into-first-GB-of-memory.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-0419-ARM-dts-bcm2711-force-CMA-into-first-GB-of-memory.patch | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0419-ARM-dts-bcm2711-force-CMA-into-first-GB-of-memory.patch b/target/linux/bcm27xx/patches-5.4/950-0419-ARM-dts-bcm2711-force-CMA-into-first-GB-of-memory.patch new file mode 100644 index 0000000000..44f60d610f --- /dev/null +++ b/target/linux/bcm27xx/patches-5.4/950-0419-ARM-dts-bcm2711-force-CMA-into-first-GB-of-memory.patch @@ -0,0 +1,45 @@ +From 4bcb99a967998d255ef009bb0b6880ae99c6f6bf Mon Sep 17 00:00:00 2001 +From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> +Date: Wed, 6 Nov 2019 10:59:44 +0100 +Subject: [PATCH] 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> +--- + arch/arm/boot/dts/bcm2711.dtsi | 20 ++++++++++++++++++++ + 1 file changed, 20 insertions(+) + +--- 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: |