target/linux/bcm27xx/patches-5.10/950-0730-overlays-Reduce-Pi-4-vc4-CMA-size-to-320MB.patch

   1 From 0d5d8f373125e5bdf331d8fc579b2cf18171c1c0 Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.com>
   3 Date: Tue, 3 Aug 2021 11:32:30 +0100
   4 Subject: [PATCH] overlays: Reduce Pi 4 vc4 CMA size to 320MB
   5
   6 Reduce the default CMA allocation requested by the vc4-kms-v3d-pi4 and
   7 vc4-fkms-v3d-pi4 overlays to 320MB.
   8
   9 Use magic values of the form (<n>*64 - 4)MB to encode default values
  10 of <n>*64MB, allowing these defaults to be distinguished from values
  11 set explicitly by the user with the usual overlay parameters (e.g.
  12 "cma-384"). Only default values will be capped if the Pi RAM is too
  13 small or the gpu_mem setting too large for it to be viable.
  14
  15 Signed-off-by: Phil Elwell <phil@raspberrypi.com>
  16 ---
  17  arch/arm/boot/dts/overlays/vc4-fkms-v3d-pi4-overlay.dts | 2 +-
  18  arch/arm/boot/dts/overlays/vc4-kms-v3d-pi4-overlay.dts  | 2 +-
  19  2 files changed, 2 insertions(+), 2 deletions(-)
  20
  21 --- a/arch/arm/boot/dts/overlays/vc4-fkms-v3d-pi4-overlay.dts
  22 +++ b/arch/arm/boot/dts/overlays/vc4-fkms-v3d-pi4-overlay.dts
  23 @@ -8,7 +8,7 @@
  24  #include "cma-overlay.dts"
  25
  26  &frag0 {
  27 -       size = <(512*1024*1024)>;
  28 +       size = <((320-4)*1024*1024)>;
  29  };
  30
  31  / {
  32 --- a/arch/arm/boot/dts/overlays/vc4-kms-v3d-pi4-overlay.dts
  33 +++ b/arch/arm/boot/dts/overlays/vc4-kms-v3d-pi4-overlay.dts
  34 @@ -10,7 +10,7 @@
  35  #include "cma-overlay.dts"
  36
  37  &frag0 {
  38 -       size = <(512*1024*1024)>;
  39 +       size = <((320-4)*1024*1024)>;
  40  };
  41
  42  / {