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From ccf75f2a6f4045484c4539f7d47264f8f6b8453c Mon Sep 17 00:00:00 2001
From: Timon Skerutsch <kernel@diodes-delight.com>
Date: Mon, 13 Nov 2023 22:52:35 +0100
Subject: [PATCH] overlays: example overlay for using panel-dsi on RPi
Analog to the generic panel-dpi overlay to use panel-dsi with dtparam
to not require a panel specific overlay for simple use cases that
do not require setting more niche DSI modes.
Signed-off-by: Timon Skerutsch <kernel@diodes-delight.com>
---
arch/arm/boot/dts/overlays/Makefile | 1 +
arch/arm/boot/dts/overlays/README | 31 +++++
.../overlays/vc4-kms-dsi-generic-overlay.dts | 106 ++++++++++++++++++
3 files changed, 138 insertions(+)
create mode 100644 arch/arm/boot/dts/overlays/vc4-kms-dsi-generic-overlay.dts
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -293,6 +293,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
vc4-kms-dpi-hyperpixel4sq.dtbo \
vc4-kms-dpi-panel.dtbo \
vc4-kms-dsi-7inch.dtbo \
+ vc4-kms-dsi-generic.dtbo \
vc4-kms-dsi-lt070me05000.dtbo \
vc4-kms-dsi-lt070me05000-v2.dtbo \
vc4-kms-dsi-waveshare-panel.dtbo \
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -4785,6 +4785,37 @@ Params: sizex Touchscr
the default DSI1 and i2c_csi_dsi).
+Name: vc4-kms-dsi-generic
+Info: Enable a generic DSI display under KMS.
+ Default timings are for a 840x480 RGB888 panel.
+ Requires vc4-kms-v3d to be loaded.
+Load: dtoverlay=vc4-kms-dsi-generic,<param>=<val>
+Params: clock-frequency Display clock frequency (Hz)
+ hactive Horizontal active pixels
+ hfp Horizontal front porch
+ hsync Horizontal sync pulse width
+ hbp Horizontal back porch
+ vactive Vertical active lines
+ vfp Vertical front porch
+ vsync Vertical sync pulse width
+ vbp Vertical back porch
+ width-mm Define the screen width in mm
+ height-mm Define the screen height in mm
+ rgb565 Change to RGB565 output
+ rgb666 Change to RGB666 output
+ rgb666p Change to RGB666 output with pixel packing
+ rgb888 Change to RGB888 output, this is the default
+ one-lane Use one DSI lane for data transmission
+ This is the default
+ two-lane Use two DSI lanes for data transmission
+ three-lane Use three DSI lanes for data transmission
+ Only supported on Pi5 and CM
+ four-lane Use four DSI lanes for data transmission
+ Only supported on Pi5 and CM
+ dsi0 Switch DSI port to DSI0
+ Only supported on Pi5 and CM
+
+
Name: vc4-kms-dsi-lt070me05000
Info: Enable a JDI LT070ME05000 DSI display on DSI1.
Note that this is a 4 lane DSI device, so it will only work on a Compute
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/vc4-kms-dsi-generic-overlay.dts
@@ -0,0 +1,106 @@
+/dts-v1/;
+/plugin/;
+
+/ {
+ compatible = "brcm,bcm2835";
+
+ dsi_frag: fragment@0 {
+ target = <&dsi1>;
+ __overlay__{
+ status = "okay";
+ #address-cells = <1>;
+ #size-cells = <0>;
+ port {
+ dsi_out:endpoint {
+ remote-endpoint = <&panel_dsi_port>;
+ };
+ };
+ panel: panel-dsi-generic@0 {
+ // See panel-dsi.yaml binding
+ // Using dummy name for panel model
+ compatible = "Generic,panel-dsi","panel-dsi";
+ reg = <0>;
+ power-supply = <0>;
+ backlight = <0>;
+ dsi-color-format = "RGB888";
+ mode = "MODE_VIDEO";
+ width-mm = <0>;
+ height-mm = <0>;
+
+ port {
+ panel_dsi_port: endpoint {
+ data-lanes = <1>;
+ remote-endpoint = <&dsi_out>;
+ };
+ };
+
+ timing: panel-timing {
+ clock-frequency = <30000000>;
+ hactive = <840>;
+ vactive = <480>;
+ hback-porch = <44>;
+ hfront-porch = <46>;
+ hsync-len = <2>;
+ vback-porch = <18>;
+ vfront-porch = <16>;
+ vsync-len = <2>;
+ };
+ };
+ };
+ };
+
+ fragment@1 {
+ target = <&panel_dsi_port>;
+ __dormant__ {
+ data-lanes = <1>;
+ };
+ };
+
+ fragment@2 {
+ target = <&panel_dsi_port>;
+ __dormant__ {
+ data-lanes = <1 2>;
+ };
+ };
+
+ fragment@3 {
+ target = <&panel_dsi_port>;
+ __dormant__ {
+ data-lanes = <1 2 3>;
+ };
+ };
+
+ fragment@4 {
+ target = <&panel_dsi_port>;
+ __dormant__ {
+ data-lanes = <1 2 3 4>;
+ };
+ };
+
+ __overrides__ {
+ dsi0 = <&dsi_frag>, "target:0=",<&dsi0>;
+
+ clock-frequency = <&timing>, "clock-frequency:0";
+ hactive = <&timing>, "hactive:0";
+ hfp = <&timing>, "hfront-porch:0";
+ hsync = <&timing>, "hsync-len:0";
+ hbp = <&timing>, "hback-porch:0";
+ vactive = <&timing>, "vactive:0";
+ vfp = <&timing>, "vfront-porch:0";
+ vsync = <&timing>, "vsync-len:0";
+ vbp = <&timing>, "vback-porch:0";
+
+ width-mm = <&panel>, "width-mm:0";
+ height-mm = <&panel>, "height-mm:0";
+
+ rgb565 = <&panel>, "dsi-color-format=RGB565";
+ rgb666p = <&panel>, "dsi-color-format=RGB666_PACKED";
+ rgb666 = <&panel>, "dsi-color-format=RGB666";
+ rgb888 = <&panel>, "dsi-color-format=RGB888";
+ one-lane = <0>,"+1";
+ two-lane = <0>,"+2";
+ three-lane = <0>,"+3";
+ four-lane = <0>,"+4";
+ };
+
+};
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