diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0627-ARM-dts-bcm283x-Unify-CMA-configuration.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-0627-ARM-dts-bcm283x-Unify-CMA-configuration.patch | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0627-ARM-dts-bcm283x-Unify-CMA-configuration.patch b/target/linux/bcm27xx/patches-5.4/950-0627-ARM-dts-bcm283x-Unify-CMA-configuration.patch new file mode 100644 index 0000000000..a0dfcb3325 --- /dev/null +++ b/target/linux/bcm27xx/patches-5.4/950-0627-ARM-dts-bcm283x-Unify-CMA-configuration.patch @@ -0,0 +1,95 @@ +From a2e6d1c03908eccf76b9305c4a493230a36035c0 Mon Sep 17 00:00:00 2001 +From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> +Date: Fri, 10 Jan 2020 18:29:35 +0100 +Subject: [PATCH] ARM: dts: bcm283x: Unify CMA configuration + +commit c5a1e5375d19bd4001c59dc5d482ac5b1ba51cbf upstream. + +With the introduction of the Raspberry Pi 4 we were forced to explicitly +configure CMA's location, since arm64 defaults it into the ZONE_DMA32 +memory area, which is not good enough to perform DMA operations on that +device. To bypass this limitation a dedicated CMA DT node was created, +explicitly indicating the acceptable memory range and size. + +That said, compatibility between boards is a must on the Raspberry Pi +ecosystem so this creates a common CMA DT node so as for DT overlays to +be able to update CMA's properties regardless of the board being used. + +Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> +Reviewed-by: Phil Elwell <phil@raspberrypi.org> +Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> +--- + arch/arm/boot/dts/bcm2711.dtsi | 32 +++++++++++++------------------- + arch/arm/boot/dts/bcm283x.dtsi | 13 +++++++++++++ + 2 files changed, 26 insertions(+), 19 deletions(-) + +--- a/arch/arm/boot/dts/bcm2711.dtsi ++++ b/arch/arm/boot/dts/bcm2711.dtsi +@@ -12,25 +12,6 @@ + + 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; +- }; +- }; +- + vc4: gpu { + compatible = "brcm,bcm2711-vc5"; + status = "disabled"; +@@ -992,6 +973,19 @@ + }; + }; + ++&rmem { ++ #address-cells = <2>; ++}; ++ ++&cma { ++ /* ++ * 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). ++ */ ++ alloc-ranges = <0x0 0x00000000 0x40000000>; ++}; ++ + &i2c0 { + compatible = "brcm,bcm2711-i2c", "brcm,bcm2835-i2c"; + interrupts = <GIC_SPI 117 IRQ_TYPE_LEVEL_HIGH>; +--- a/arch/arm/boot/dts/bcm283x.dtsi ++++ b/arch/arm/boot/dts/bcm283x.dtsi +@@ -30,6 +30,19 @@ + stdout-path = "serial0:115200n8"; + }; + ++ rmem: reserved-memory { ++ #address-cells = <1>; ++ #size-cells = <1>; ++ ranges; ++ ++ cma: linux,cma { ++ compatible = "shared-dma-pool"; ++ size = <0x4000000>; /* 64MB */ ++ reusable; ++ linux,cma-default; ++ }; ++ }; ++ + thermal-zones { + cpu_thermal: cpu-thermal { + polling-delay-passive = <0>; |