1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
From a2e6d1c03908eccf76b9305c4a493230a36035c0 Mon Sep 17 00:00:00 2001
From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Date: Fri, 10 Jan 2020 18:29:35 +0100
Subject: [PATCH] ARM: dts: bcm283x: Unify CMA configuration
commit c5a1e5375d19bd4001c59dc5d482ac5b1ba51cbf upstream.
With the introduction of the Raspberry Pi 4 we were forced to explicitly
configure CMA's location, since arm64 defaults it into the ZONE_DMA32
memory area, which is not good enough to perform DMA operations on that
device. To bypass this limitation a dedicated CMA DT node was created,
explicitly indicating the acceptable memory range and size.
That said, compatibility between boards is a must on the Raspberry Pi
ecosystem so this creates a common CMA DT node so as for DT overlays to
be able to update CMA's properties regardless of the board being used.
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Reviewed-by: Phil Elwell <phil@raspberrypi.org>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
arch/arm/boot/dts/bcm2711.dtsi | 32 +++++++++++++-------------------
arch/arm/boot/dts/bcm283x.dtsi | 13 +++++++++++++
2 files changed, 26 insertions(+), 19 deletions(-)
--- a/arch/arm/boot/dts/bcm2711.dtsi
+++ b/arch/arm/boot/dts/bcm2711.dtsi
@@ -12,25 +12,6 @@
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;
- };
- };
-
vc4: gpu {
compatible = "brcm,bcm2711-vc5";
status = "disabled";
@@ -992,6 +973,19 @@
};
};
+&rmem {
+ #address-cells = <2>;
+};
+
+&cma {
+ /*
+ * 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).
+ */
+ alloc-ranges = <0x0 0x00000000 0x40000000>;
+};
+
&i2c0 {
compatible = "brcm,bcm2711-i2c", "brcm,bcm2835-i2c";
interrupts = <GIC_SPI 117 IRQ_TYPE_LEVEL_HIGH>;
--- a/arch/arm/boot/dts/bcm283x.dtsi
+++ b/arch/arm/boot/dts/bcm283x.dtsi
@@ -30,6 +30,19 @@
stdout-path = "serial0:115200n8";
};
+ rmem: reserved-memory {
+ #address-cells = <1>;
+ #size-cells = <1>;
+ ranges;
+
+ cma: linux,cma {
+ compatible = "shared-dma-pool";
+ size = <0x4000000>; /* 64MB */
+ reusable;
+ linux,cma-default;
+ };
+ };
+
thermal-zones {
cpu_thermal: cpu-thermal {
polling-delay-passive = <0>;
|
