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42 lines
1.3 KiB
Diff
42 lines
1.3 KiB
Diff
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From f3e5f85353153a6941fc9e32871b5037e875d1ae Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.com>
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Date: Wed, 17 May 2023 13:39:18 +0100
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Subject: [PATCH] ARM: dts: bcm2711-rpi: Set a 1GB ZONE_DMA limit
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The arm64 initialisation uses the physical address reachable by all
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DMA controllers to set the size of ZONE_DMA. This fails on BCM2711
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with the current dts files because the declaration of the I/O space
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fools it into thinking the legacy 30-bit DMA channels can see most
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of the 32-bit space.
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Take advantage of the simple nature of the implementation by adding
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a node with a restricted dma-ranges property solely so to act as the
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limiting factor in the calculation.
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See: https://github.com/raspberrypi/linux/issues/5470
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Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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---
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arch/arm/boot/dts/bcm2711-rpi-ds.dtsi | 10 ++++++++++
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1 file changed, 10 insertions(+)
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--- a/arch/arm/boot/dts/bcm2711-rpi-ds.dtsi
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+++ b/arch/arm/boot/dts/bcm2711-rpi-ds.dtsi
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@@ -63,6 +63,16 @@
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spi6 = &spi6;
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/delete-property/ intc;
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};
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+
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+ /*
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+ * Add a node with a dma-ranges value that exists only to be found
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+ * by of_dma_get_max_cpu_address, and hence limit the DMA zone.
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+ */
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+ zone_dma {
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+ #address-cells = <1>;
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+ #size-cells = <1>;
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+ dma-ranges = <0x0 0x0 0x0 0x40000000>;
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+ };
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};
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&vc4 {
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