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motorola-rav: Enable simplefb

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Note that DRM subsystem needs to be enabled for the kernel to build, and
that once DRM starts, it will trample on the framebuffer setup :(
This commit is contained in:
Samuel Dionne-Riel 2021-06-29 21:15:13 -04:00
parent dbf18632d0
commit b2c296fca7
3 changed files with 60 additions and 1 deletions
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58
devices/motorola-rav/kernel/0001-Mobile-NixOS-Enable-simplefb-framebuffer.patch Normal file
View File

@ -0,0 +1,58 @@
From 9d8ef8d5040691cf6bbd5872887f8b523b123597 Mon Sep 17 00:00:00 2001
From: Samuel Dionne-Riel <samuel@dionne-riel.com>
Date: Tue, 29 Jun 2021 21:13:16 -0400
Subject: [PATCH] [Mobile NixOS]: Enable simplefb framebuffer
Note that when the DRM subsystem kick-in, it will irreparably trample
over the framebuffer setup.
---
arch/arm64/boot/dts/qcom/trinket-rav-base.dts | 36 +++++++++++++++++++
1 file changed, 36 insertions(+)
diff --git a/arch/arm64/boot/dts/qcom/trinket-rav-base.dts b/arch/arm64/boot/dts/qcom/trinket-rav-base.dts
index f89a2757a3363..b474a15aeebf7 100644
--- a/arch/arm64/boot/dts/qcom/trinket-rav-base.dts
+++ b/arch/arm64/boot/dts/qcom/trinket-rav-base.dts
@@ -23,3 +23,39 @@
&firmware {
/delete-node/ android;
};
+
+/ {
+ aliases {
+ display0 = &framebuffer0;
+ };
+
+ chosen {
+ #address-cells = <2>;
+ #size-cells = <2>;
+ ranges;
+ stdout-path = "display0";
+
+ /*
+ * HACK: Use framebuffer setup by the bootloader for simplefb.
+ * https://wiki.postmarketos.org/wiki/SDM845_Mainlining#Creating_a_framebuffer
+ * 0x5C000000, 0x01000000, "Display Reserved", AddMem, MEM_RES, SYS_MEM_CAP, Reserv, WRITE_THROUGH_XN
+ */
+ framebuffer0: framebuffer@9d400000 {
+ compatible = "simple-framebuffer";
+ reg = <0 0x5C000000 0 (720 * 1560 * 4)>;
+ width = <720>;
+ height = <1560>;
+ stride = <(720 * 4)>;
+ format = "a8r8g8b8";
+ status = "okay";
+ };
+ };
+
+ reserved-memory {
+ fb_mem: memory@a1a10000 {
+ compatible = "removed-dma-pool";
+ no-map;
+ reg = <0 0x5C000000 0 (720 * 1560 * 4)>;
+ };
+ };
+};
--
2.29.2

2
devices/motorola-rav/kernel/config.aarch64
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@ -3331,7 +3331,7 @@ CONFIG_FB_VIRTUAL=y
# CONFIG_FB_MSM is not set
# CONFIG_FB_BROADSHEET is not set
# CONFIG_FB_AUO_K190X is not set
# CONFIG_FB_SIMPLE is not set
CONFIG_FB_SIMPLE=y
# CONFIG_MSM_DBA is not set
# CONFIG_FB_SSD1307 is not set
# CONFIG_FB_SM712 is not set

1
devices/motorola-rav/kernel/default.nix
View File

@ -28,6 +28,7 @@ mobile-nixos.kernel-builder-clang_8 {
./0001-HACK-himax_mmi-Fix-early-init-and-work-around-suspen.patch
./0001-himax_0flash_mmi-Fix-for-built-in-module.patch
./0003-arch-arm64-Add-config-option-to-fix-bootloader-cmdli.patch
./0001-Mobile-NixOS-Enable-simplefb-framebuffer.patch
];
enableRemovingWerror = true;