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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.patch45
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: