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41 lines
1.8 KiB
Diff
41 lines
1.8 KiB
Diff
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From 44d7ee4730fbe3c00aba0457489acd0b6e2937c9 Mon Sep 17 00:00:00 2001
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From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
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Date: Wed, 4 Dec 2019 13:56:33 +0100
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Subject: [PATCH] ARM: dts: bcm2711: fix soc's node dma-ranges
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Raspberry Pi's firmware has a feature to select how much memory to
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reserve for its GPU called 'gpu_mem'. The possible values go from 16MB
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to 944MB, with a default of 64MB. This memory resides in the topmost
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part of the lower 1GB memory area and grows bigger expanding towards the
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begging of memory.
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It turns out that with low 'gpu_mem' values (16MB and 32MB) the size of
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the memory available to the system in the lower 1GB area can outgrow the
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interconnect's dma-range as its size was selected based on the maximum
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system memory available given the default gpu_mem configuration. This
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makes that memory slice unavailable for DMA. And may cause nasty kernel
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warnings if CMA happens to include it.
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Change soc's dma-ranges to really reflect it's HW limitation, which is
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being able to only DMA to the lower 1GB area.
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Fixes: 7dbe8c62ceeb ("ARM: dts: Add minimal Raspberry Pi 4 support")
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Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
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Reviewed-by: Phil Elwell <phil@raspberrypi.org>
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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 | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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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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@@ -43,7 +43,7 @@
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<0x7c000000 0x0 0xfc000000 0x02000000>,
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<0x40000000 0x0 0xff800000 0x00800000>;
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/* Emulate a contiguous 30-bit address range for DMA */
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- dma-ranges = <0xc0000000 0x0 0x00000000 0x3c000000>;
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+ dma-ranges = <0xc0000000 0x0 0x00000000 0x40000000>;
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/*
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* This node is the provider for the enable-method for
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