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46 lines
1.3 KiB
Diff
46 lines
1.3 KiB
Diff
From 4bcb99a967998d255ef009bb0b6880ae99c6f6bf Mon Sep 17 00:00:00 2001
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From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
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Date: Wed, 6 Nov 2019 10:59:44 +0100
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Subject: [PATCH] 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
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Raspberry Pi 4 since it contains peripherals that can only address the
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first GB of memory. Explicitly place the CMA into that area.
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Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
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Acked-by: Stefan Wahren <wahrenst@gmx.net>
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Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
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---
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arch/arm/boot/dts/bcm2711.dtsi | 20 ++++++++++++++++++++
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1 file changed, 20 insertions(+)
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--- a/arch/arm/boot/dts/bcm2711.dtsi
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+++ b/arch/arm/boot/dts/bcm2711.dtsi
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@@ -12,6 +12,26 @@
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interrupt-parent = <&gicv2>;
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+ reserved-memory {
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+ #address-cells = <2>;
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+ #size-cells = <1>;
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+ ranges;
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+
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+ /*
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+ * arm64 reserves the CMA by default somewhere in ZONE_DMA32,
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+ * that's not good enough for the BCM2711 as some devices can
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+ * only address the lower 1G of memory (ZONE_DMA).
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+ */
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+ linux,cma {
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+ compatible = "shared-dma-pool";
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+ size = <0x2000000>; /* 32MB */
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+ alloc-ranges = <0x0 0x00000000 0x40000000>;
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+ reusable;
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+ linux,cma-default;
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+ };
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+ };
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+
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+
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soc {
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/*
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* Defined ranges:
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