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From 2648818dcb79c89305cf68b5f53a521b9065c341 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Sun, 24 Apr 2016 17:28:15 +0100
Subject: [PATCH] drm/vc4: Add DT parameters to control CMA usage
Example: dtoverlay=vc4-kms-v3d,cma-128
See: https://github.com/raspberrypi/linux/pull/1431
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
arch/arm/boot/dts/overlays/README | 8 +++--
arch/arm/boot/dts/overlays/vc4-kms-v3d-overlay.dts | 36 ++++++++++++++++++++++
2 files changed, 42 insertions(+), 2 deletions(-)
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -1023,8 +1023,12 @@ Name: vc4-kms-v3d
Info: Enable Eric Anholt's DRM VC4 HDMI/HVS/V3D driver. Running startx or
booting to GUI while this overlay is in use will cause interesting
lockups.
-Load: dtoverlay=vc4-kms-v3d
-Params: <None>
+Load: dtoverlay=vc4-kms-v3d,<param>
+Params: cma-256 CMA is 256MB, 256MB-aligned (needs 1GB)
+ cma-192 CMA is 192MB, 256MB-aligned (needs 1GB)
+ cma-128 CMA is 128MB, 128MB-aligned
+ cma-96 CMA is 96MB, 128MB-aligned
+ cma-64 CMA is 64MB, 64MB-aligned
Name: vga666
--- a/arch/arm/boot/dts/overlays/vc4-kms-v3d-overlay.dts
+++ b/arch/arm/boot/dts/overlays/vc4-kms-v3d-overlay.dts
@@ -94,4 +94,40 @@
bootargs = "cma=256M@256M";
};
};
+
+ fragment@5 {
+ target-path = "/chosen";
+ __dormant__ {
+ bootargs = "cma=192M@256M";
+ };
+ };
+
+ fragment@6 {
+ target-path = "/chosen";
+ __dormant__ {
+ bootargs = "cma=128M@128M";
+ };
+ };
+
+ fragment@7 {
+ target-path = "/chosen";
+ __dormant__ {
+ bootargs = "cma=96M@128M";
+ };
+ };
+
+ fragment@8 {
+ target-path = "/chosen";
+ __dormant__ {
+ bootargs = "cma=64M@64M";
+ };
+ };
+
+ __overrides__ {
+ cma-256 = <0>,"+4-5-6-7-8";
+ cma-192 = <0>,"-4+5-6-7-8";
+ cma-128 = <0>,"-4-5+6-7-8";
+ cma-96 = <0>,"-4-5-6+7-8";
+ cma-64 = <0>,"-4-5-6-7+8";
+ };
};
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