target/linux/bcm27xx/patches-5.4/950-0635-ARM-dts-bcm283x-Unify-CMA-configuration.patch

   1 From a2e6d1c03908eccf76b9305c4a493230a36035c0 Mon Sep 17 00:00:00 2001
   2 From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
   3 Date: Fri, 10 Jan 2020 18:29:35 +0100
   4 Subject: [PATCH] ARM: dts: bcm283x: Unify CMA configuration
   5
   6 commit c5a1e5375d19bd4001c59dc5d482ac5b1ba51cbf upstream.
   7
   8 With the introduction of the Raspberry Pi 4 we were forced to explicitly
   9 configure CMA's location, since arm64 defaults it into the ZONE_DMA32
  10 memory area, which is not good enough to perform DMA operations on that
  11 device. To bypass this limitation a dedicated CMA DT node was created,
  12 explicitly indicating the acceptable memory range and size.
  13
  14 That said, compatibility between boards is a must on the Raspberry Pi
  15 ecosystem so this creates a common CMA DT node so as for DT overlays to
  16 be able to update CMA's properties regardless of the board being used.
  17
  18 Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
  19 Reviewed-by: Phil Elwell <phil@raspberrypi.org>
  20 Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
  21 ---
  22  arch/arm/boot/dts/bcm2711.dtsi | 32 +++++++++++++-------------------
  23  arch/arm/boot/dts/bcm283x.dtsi | 13 +++++++++++++
  24  2 files changed, 26 insertions(+), 19 deletions(-)
  25
  26 --- a/arch/arm/boot/dts/bcm2711.dtsi
  27 +++ b/arch/arm/boot/dts/bcm2711.dtsi
  28 @@ -12,25 +12,6 @@
  29
  30         interrupt-parent = <&gicv2>;
  31
  32 -       reserved-memory {
  33 -               #address-cells = <2>;
  34 -               #size-cells = <1>;
  35 -               ranges;
  36 -
  37 -               /*
  38 -                * arm64 reserves the CMA by default somewhere in ZONE_DMA32,
  39 -                * that's not good enough for the BCM2711 as some devices can
  40 -                * only address the lower 1G of memory (ZONE_DMA).
  41 -                */
  42 -               linux,cma {
  43 -                       compatible = "shared-dma-pool";
  44 -                       size = <0x2000000>; /* 32MB */
  45 -                       alloc-ranges = <0x0 0x00000000 0x40000000>;
  46 -                       reusable;
  47 -                       linux,cma-default;
  48 -               };
  49 -       };
  50 -
  51         vc4: gpu {
  52                 compatible = "brcm,bcm2711-vc5";
  53                 status = "disabled";
  54 @@ -992,6 +973,19 @@
  55         };
  56  };
  57
  58 +&rmem {
  59 +       #address-cells = <2>;
  60 +};
  61 +
  62 +&cma {
  63 +       /*
  64 +        * arm64 reserves the CMA by default somewhere in ZONE_DMA32,
  65 +        * that's not good enough for the BCM2711 as some devices can
  66 +        * only address the lower 1G of memory (ZONE_DMA).
  67 +        */
  68 +       alloc-ranges = <0x0 0x00000000 0x40000000>;
  69 +};
  70 +
  71  &i2c0 {
  72         compatible = "brcm,bcm2711-i2c", "brcm,bcm2835-i2c";
  73         interrupts = <GIC_SPI 117 IRQ_TYPE_LEVEL_HIGH>;
  74 --- a/arch/arm/boot/dts/bcm283x.dtsi
  75 +++ b/arch/arm/boot/dts/bcm283x.dtsi
  76 @@ -30,6 +30,19 @@
  77                 stdout-path = "serial0:115200n8";
  78         };
  79
  80 +       rmem: reserved-memory {
  81 +               #address-cells = <1>;
  82 +               #size-cells = <1>;
  83 +               ranges;
  84 +
  85 +               cma: linux,cma {
  86 +                       compatible = "shared-dma-pool";
  87 +                       size = <0x4000000>; /* 64MB */
  88 +                       reusable;
  89 +                       linux,cma-default;
  90 +               };
  91 +       };
  92 +
  93         thermal-zones {
  94                 cpu_thermal: cpu-thermal {
  95                         polling-delay-passive = <0>;