target/linux/brcm2708/patches-4.4/0302-drm-vc4-Add-DT-parameters-to-control-CMA-usage.patch

   1 From 4f7d976e703d5196ade9d27074ce4bb49c11bb52 Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.org>
   3 Date: Sun, 24 Apr 2016 17:28:15 +0100
   4 Subject: [PATCH] drm/vc4: Add DT parameters to control CMA usage
   5
   6 Example: dtoverlay=vc4-kms-v3d,cma-128
   7
   8 See: https://github.com/raspberrypi/linux/pull/1431
   9
  10 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
  11 ---
  12  arch/arm/boot/dts/overlays/README                  |  8 +++--
  13  arch/arm/boot/dts/overlays/vc4-kms-v3d-overlay.dts | 36 ++++++++++++++++++++++
  14  2 files changed, 42 insertions(+), 2 deletions(-)
  15
  16 --- a/arch/arm/boot/dts/overlays/README
  17 +++ b/arch/arm/boot/dts/overlays/README
  18 @@ -1023,8 +1023,12 @@ Name:   vc4-kms-v3d
  19  Info:   Enable Eric Anholt's DRM VC4 HDMI/HVS/V3D driver. Running startx or
  20          booting to GUI while this overlay is in use will cause interesting
  21          lockups.
  22 -Load:   dtoverlay=vc4-kms-v3d
  23 -Params: <None>
  24 +Load:   dtoverlay=vc4-kms-v3d,<param>
  25 +Params: cma-256                 CMA is 256MB, 256MB-aligned (needs 1GB)
  26 +        cma-192                 CMA is 192MB, 256MB-aligned (needs 1GB)
  27 +        cma-128                 CMA is 128MB, 128MB-aligned
  28 +        cma-96                  CMA is 96MB, 128MB-aligned
  29 +        cma-64                  CMA is 64MB, 64MB-aligned
  30
  31
  32  Name:   vga666
  33 --- a/arch/arm/boot/dts/overlays/vc4-kms-v3d-overlay.dts
  34 +++ b/arch/arm/boot/dts/overlays/vc4-kms-v3d-overlay.dts
  35 @@ -94,4 +94,40 @@
  36                         bootargs = "cma=256M@256M";
  37                 };
  38         };
  39 +
  40 +       fragment@5 {
  41 +               target-path = "/chosen";
  42 +               __dormant__ {
  43 +                       bootargs = "cma=192M@256M";
  44 +               };
  45 +       };
  46 +
  47 +       fragment@6 {
  48 +               target-path = "/chosen";
  49 +               __dormant__ {
  50 +                       bootargs = "cma=128M@128M";
  51 +               };
  52 +       };
  53 +
  54 +       fragment@7 {
  55 +               target-path = "/chosen";
  56 +               __dormant__ {
  57 +                       bootargs = "cma=96M@128M";
  58 +               };
  59 +       };
  60 +
  61 +       fragment@8 {
  62 +               target-path = "/chosen";
  63 +               __dormant__ {
  64 +                       bootargs = "cma=64M@64M";
  65 +               };
  66 +       };
  67 +
  68 +       __overrides__ {
  69 +               cma-256 = <0>,"+4-5-6-7-8";
  70 +               cma-192 = <0>,"-4+5-6-7-8";
  71 +               cma-128 = <0>,"-4-5+6-7-8";
  72 +               cma-96  = <0>,"-4-5-6+7-8";
  73 +               cma-64  = <0>,"-4-5-6-7+8";
  74 +       };
  75  };