From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
To: catalin.marinas@arm.com, linux-kernel@vger.kernel.org,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Eric Anholt <eric@anholt.net>, Stefan Wahren <wahrenst@gmx.net>
Cc: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
devicetree@vger.kernel.org,
bcm-kernel-feedback-list@broadcom.com,
linux-rpi-kernel@lists.infradead.org,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 1/2] ARM: dts: bcm2711: force CMA into first GB of memory
Date: Wed, 6 Nov 2019 10:59:44 +0100 [thread overview]
Message-ID: <20191106095945.22933-2-nsaenzjulienne@suse.de> (raw)
In-Reply-To: <20191106095945.22933-1-nsaenzjulienne@suse.de>
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>
---
Changes since v1:
- Move into bcm2711.dtsi
arch/arm/boot/dts/bcm2711.dtsi | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/arch/arm/boot/dts/bcm2711.dtsi b/arch/arm/boot/dts/bcm2711.dtsi
index 1f3acd3363ea..6000a01652fa 100644
--- 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 Raspberry Pi 4 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:
--
2.23.0
next prev parent reply other threads:[~2019-11-06 10:00 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-06 9:59 [PATCH v2 0/2] arm64: Fix CMA/crashkernel reservation Nicolas Saenz Julienne
2019-11-06 9:59 ` Nicolas Saenz Julienne [this message]
2019-11-07 6:23 ` [PATCH v2 1/2] ARM: dts: bcm2711: force CMA into first GB of memory Stefan Wahren
2019-11-07 9:42 ` Nicolas Saenz Julienne
2019-11-14 20:28 ` Florian Fainelli
2019-11-06 9:59 ` [PATCH v2 2/2] arm64: mm: reserve CMA and crashkernel in ZONE_DMA32 Nicolas Saenz Julienne
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