From 4e962ca0022e50321ea4f1a112cd3b3573730717 Mon Sep 17 00:00:00 2001
From: Andrew Opalach <andrew@akon.city>
Date: Wed, 27 Nov 2024 15:06:28 -0500
Subject: Support raspberry pi EGL

Signed-off-by: Andrew Opalach <andrew@akon.city>
---
 hardware/cmsb-001/configuration.nix       |  34 ++++++---
 hardware/cmsb-001/vc4-kms-v3d-overlay.dts | 122 ++++++++++++++++++++++++++++++
 2 files changed, 147 insertions(+), 9 deletions(-)
 create mode 100644 hardware/cmsb-001/vc4-kms-v3d-overlay.dts

(limited to 'hardware')

diff --git a/hardware/cmsb-001/configuration.nix b/hardware/cmsb-001/configuration.nix
index bbff4e1..799065a 100644
--- a/hardware/cmsb-001/configuration.nix
+++ b/hardware/cmsb-001/configuration.nix
@@ -38,16 +38,14 @@
     "usbhid"
     "usb_storage"
     "vc4"
-    "reset-raspberrypi"
+    "v3d"
     "bcm2835_dma"
     "i2c_bcm2835"
+    "reset-raspberrypi"
   ];
-  boot.kernelModules = [ ];
+  boot.initrd.kernelModules = [];
   boot.kernelParams = [ "mitigations=off" "file_caps=1" ];
   boot.blacklistedKernelModules = [ "snd_bcm2835" ];
-  boot.supportedFilesystems = [ ];
-  boot.extraModulePackages = [ ];
-  boot.initrd.kernelModules = [ ];
 
   hardware.enableRedistributableFirmware = true;
   hardware.graphics.enable = true;
@@ -137,10 +135,11 @@
     user = "akiyo";
     environment = {
       WLR_LIBINPUT_NO_DEVICES = "1";
-      LIBGL_ALWAYS_SOFTWARE = "1";
     };
     program = "${pkgs.camu}/bin/cmv";
   };
+  systemd.services."cage-tty1".serviceConfig.StandardOutput = lib.mkForce "journal+console";
+  systemd.services."cage-tty1".wantedBy = [];
 
   # https://pablo.tools/blog/computers/nixos-generate-raspberry-images/
   #sdImage = {
@@ -158,6 +157,18 @@
   #  '';
   #};
 
+  # https://retropie.org.uk/docs/Overclocking/
+  # BOOT/config.txt (changes)
+  #  gpu_mem=64
+  #  total_mem=1024
+  #  arm_freq=1300
+  #  gpu_freq=500
+  #  core_freq=500
+  #  sdram_freq=500
+  #  sdram_schmoo=0x02000020
+  #  over_voltage=2
+  #  over_voltage_sdram=2
+
   # https://github.com/NixOS/nixos-hardware/issues/631
   hardware.deviceTree = {
     enable = true;
@@ -172,10 +183,15 @@
         name = "cma-overlay";
         dtsFile = ./cma-overlay.dts;
       }
-      { # https://raw.githubusercontent.com/raspberrypi/linux/refs/heads/rpi-6.6.y/arch/arm/boot/dts/overlays/vc4-fkms-v3d-overlay.dts
-        name = "vc4-fkms-v3d";
+      #{ # https://raw.githubusercontent.com/raspberrypi/linux/refs/heads/rpi-6.6.y/arch/arm/boot/dts/overlays/vc4-fkms-v3d-overlay.dts
+      #  name = "vc4-fkms-v3d";
+      #  # remove '#include "cma-overlay.dts"'
+      #  dtsFile = ./vc4-fkms-v3d-overlay.dts;
+      #}
+      { # https://raw.githubusercontent.com/raspberrypi/linux/refs/heads/rpi-6.6.y/arch/arm/boot/dts/overlays/vc4-kms-v3d-overlay.dts
+        name = "vc4-kms-v3d";
         # remove '#include "cma-overlay.dts"'
-        dtsFile = ./vc4-fkms-v3d-overlay.dts;
+        dtsFile = ./vc4-kms-v3d-overlay.dts;
       }
       { # https://raw.githubusercontent.com/raspberrypi/linux/refs/heads/rpi-6.6.y/arch/arm/boot/dts/overlays/disable-bt-overlay.dts
         name = "disable-bt";
diff --git a/hardware/cmsb-001/vc4-kms-v3d-overlay.dts b/hardware/cmsb-001/vc4-kms-v3d-overlay.dts
new file mode 100644
index 0000000..0b3275e
--- /dev/null
+++ b/hardware/cmsb-001/vc4-kms-v3d-overlay.dts
@@ -0,0 +1,122 @@
+/*
+ * vc4-kms-v3d-overlay.dts
+ */
+
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/clock/bcm2835.h>
+
+/ {
+	compatible = "brcm,bcm2837";
+
+	fragment@1 {
+		target = <&i2c2>;
+		__overlay__  {
+			status = "okay";
+		};
+	};
+
+	fragment@2 {
+		target = <&fb>;
+		__overlay__  {
+			status = "disabled";
+		};
+	};
+
+	fragment@3 {
+		target = <&pixelvalve0>;
+		__overlay__  {
+			status = "okay";
+		};
+	};
+
+	fragment@4 {
+		target = <&pixelvalve1>;
+		__overlay__  {
+			status = "okay";
+		};
+	};
+
+	fragment@5 {
+		target = <&pixelvalve2>;
+		__overlay__  {
+			status = "okay";
+		};
+	};
+
+	fragment@6 {
+		target = <&hvs>;
+		__overlay__  {
+			status = "okay";
+		};
+	};
+
+	fragment@7 {
+		target = <&hdmi>;
+		__overlay__  {
+			status = "okay";
+		};
+	};
+
+	fragment@8 {
+		target = <&v3d>;
+		__overlay__  {
+			status = "okay";
+		};
+	};
+
+	fragment@9 {
+		target = <&vc4>;
+		__overlay__  {
+			status = "okay";
+		};
+	};
+
+	fragment@10 {
+		target = <&clocks>;
+		__overlay__  {
+			claim-clocks = <
+				BCM2835_PLLD_DSI0
+				BCM2835_PLLD_DSI1
+				BCM2835_PLLH_AUX
+				BCM2835_PLLH_PIX
+			>;
+		};
+	};
+
+	fragment@11 {
+		target = <&vec>;
+		__dormant__  {
+			status = "okay";
+		};
+	};
+
+	fragment@12 {
+		target = <&txp>;
+		__overlay__  {
+			status = "okay";
+		};
+	};
+
+	fragment@13 {
+		target = <&hdmi>;
+		__dormant__  {
+			dmas;
+		};
+	};
+
+	fragment@14 {
+		target = <&chosen>;
+		__overlay__  {
+			bootargs = "snd_bcm2835.enable_hdmi=0";
+		};
+	};
+
+	__overrides__ {
+		audio   = <0>,"!13";
+		noaudio = <0>,"=13";
+		composite = <0>, "=11";
+		nohdmi = <0>, "-1-7";
+	};
+};
-- 
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