target/linux/bcm27xx/patches-6.1/950-1184-overlays-example-overlay-for-using-panel-dsi-on-RPi.patch

   1 From ccf75f2a6f4045484c4539f7d47264f8f6b8453c Mon Sep 17 00:00:00 2001
   2 From: Timon Skerutsch <kernel@diodes-delight.com>
   3 Date: Mon, 13 Nov 2023 22:52:35 +0100
   4 Subject: [PATCH] overlays: example overlay for using panel-dsi on RPi
   5
   6 Analog to the generic panel-dpi overlay to use panel-dsi with dtparam
   7 to not require a panel specific overlay for simple use cases that
   8 do not require setting more niche DSI modes.
   9
  10 Signed-off-by: Timon Skerutsch <kernel@diodes-delight.com>
  11 ---
  12  arch/arm/boot/dts/overlays/Makefile           |   1 +
  13  arch/arm/boot/dts/overlays/README             |  31 +++++
  14  .../overlays/vc4-kms-dsi-generic-overlay.dts  | 106 ++++++++++++++++++
  15  3 files changed, 138 insertions(+)
  16  create mode 100644 arch/arm/boot/dts/overlays/vc4-kms-dsi-generic-overlay.dts
  17
  18 --- a/arch/arm/boot/dts/overlays/Makefile
  19 +++ b/arch/arm/boot/dts/overlays/Makefile
  20 @@ -293,6 +293,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
  21         vc4-kms-dpi-hyperpixel4sq.dtbo \
  22         vc4-kms-dpi-panel.dtbo \
  23         vc4-kms-dsi-7inch.dtbo \
  24 +       vc4-kms-dsi-generic.dtbo \
  25         vc4-kms-dsi-lt070me05000.dtbo \
  26         vc4-kms-dsi-lt070me05000-v2.dtbo \
  27         vc4-kms-dsi-waveshare-panel.dtbo \
  28 --- a/arch/arm/boot/dts/overlays/README
  29 +++ b/arch/arm/boot/dts/overlays/README
  30 @@ -4785,6 +4785,37 @@ Params: sizex                   Touchscr
  31                                  the default DSI1 and i2c_csi_dsi).
  32
  33
  34 +Name:   vc4-kms-dsi-generic
  35 +Info:   Enable a generic DSI display under KMS.
  36 +        Default timings are for a 840x480 RGB888 panel.
  37 +        Requires vc4-kms-v3d to be loaded.
  38 +Load:   dtoverlay=vc4-kms-dsi-generic,<param>=<val>
  39 +Params: clock-frequency         Display clock frequency (Hz)
  40 +        hactive                 Horizontal active pixels
  41 +        hfp                     Horizontal front porch
  42 +        hsync                   Horizontal sync pulse width
  43 +        hbp                     Horizontal back porch
  44 +        vactive                 Vertical active lines
  45 +        vfp                     Vertical front porch
  46 +        vsync                   Vertical sync pulse width
  47 +        vbp                     Vertical back porch
  48 +        width-mm                Define the screen width in mm
  49 +        height-mm               Define the screen height in mm
  50 +        rgb565                  Change to RGB565 output
  51 +        rgb666                  Change to RGB666 output
  52 +        rgb666p                 Change to RGB666 output with pixel packing
  53 +        rgb888                  Change to RGB888 output, this is the default
  54 +        one-lane                Use one DSI lane for data transmission
  55 +                                This is the default
  56 +        two-lane                Use two DSI lanes for data transmission
  57 +        three-lane              Use three DSI lanes for data transmission
  58 +                                Only supported on Pi5 and CM
  59 +        four-lane               Use four DSI lanes for data transmission
  60 +                                Only supported on Pi5 and CM
  61 +        dsi0                    Switch DSI port to DSI0
  62 +                                Only supported on Pi5 and CM
  63 +
  64 +
  65  Name:   vc4-kms-dsi-lt070me05000
  66  Info:   Enable a JDI LT070ME05000 DSI display on DSI1.
  67          Note that this is a 4 lane DSI device, so it will only work on a Compute
  68 --- /dev/null
  69 +++ b/arch/arm/boot/dts/overlays/vc4-kms-dsi-generic-overlay.dts
  70 @@ -0,0 +1,106 @@
  71 +/dts-v1/;
  72 +/plugin/;
  73 +
  74 +/ {
  75 +       compatible = "brcm,bcm2835";
  76 +
  77 +       dsi_frag: fragment@0 {
  78 +               target = <&dsi1>;
  79 +               __overlay__{
  80 +                       status = "okay";
  81 +                       #address-cells = <1>;
  82 +                       #size-cells = <0>;
  83 +                       port {
  84 +                               dsi_out:endpoint {
  85 +                                       remote-endpoint = <&panel_dsi_port>;
  86 +                               };
  87 +                       };
  88 +                       panel: panel-dsi-generic@0 {
  89 +                               // See panel-dsi.yaml binding
  90 +                               // Using dummy name for panel model
  91 +                               compatible = "Generic,panel-dsi","panel-dsi";
  92 +                               reg = <0>;
  93 +                               power-supply = <0>;
  94 +                               backlight = <0>;
  95 +                               dsi-color-format = "RGB888";
  96 +                               mode = "MODE_VIDEO";
  97 +                               width-mm = <0>;
  98 +                               height-mm = <0>;
  99 +
 100 +                               port {
 101 +                                       panel_dsi_port: endpoint {
 102 +                                               data-lanes = <1>;
 103 +                                               remote-endpoint = <&dsi_out>;
 104 +                                       };
 105 +                               };
 106 +
 107 +                               timing: panel-timing {
 108 +                                       clock-frequency = <30000000>;
 109 +                                       hactive = <840>;
 110 +                                       vactive = <480>;
 111 +                                       hback-porch = <44>;
 112 +                                       hfront-porch = <46>;
 113 +                                       hsync-len = <2>;
 114 +                                       vback-porch = <18>;
 115 +                                       vfront-porch = <16>;
 116 +                                       vsync-len = <2>;
 117 +                               };
 118 +                       };
 119 +               };
 120 +       };
 121 +
 122 +       fragment@1 {
 123 +               target = <&panel_dsi_port>;
 124 +               __dormant__ {
 125 +                       data-lanes = <1>;
 126 +               };
 127 +       };
 128 +
 129 +       fragment@2 {
 130 +               target = <&panel_dsi_port>;
 131 +               __dormant__ {
 132 +                       data-lanes = <1 2>;
 133 +               };
 134 +       };
 135 +
 136 +       fragment@3 {
 137 +               target = <&panel_dsi_port>;
 138 +               __dormant__ {
 139 +                       data-lanes = <1 2 3>;
 140 +               };
 141 +       };
 142 +
 143 +       fragment@4 {
 144 +               target = <&panel_dsi_port>;
 145 +               __dormant__ {
 146 +                       data-lanes = <1 2 3 4>;
 147 +               };
 148 +       };
 149 +
 150 +       __overrides__ {
 151 +               dsi0 = <&dsi_frag>, "target:0=",<&dsi0>;
 152 +
 153 +               clock-frequency = <&timing>, "clock-frequency:0";
 154 +               hactive = <&timing>, "hactive:0";
 155 +               hfp = <&timing>, "hfront-porch:0";
 156 +               hsync = <&timing>, "hsync-len:0";
 157 +               hbp = <&timing>, "hback-porch:0";
 158 +               vactive = <&timing>, "vactive:0";
 159 +               vfp = <&timing>, "vfront-porch:0";
 160 +               vsync = <&timing>, "vsync-len:0";
 161 +               vbp = <&timing>, "vback-porch:0";
 162 +
 163 +               width-mm = <&panel>, "width-mm:0";
 164 +               height-mm = <&panel>, "height-mm:0";
 165 +
 166 +               rgb565 = <&panel>, "dsi-color-format=RGB565";
 167 +               rgb666p = <&panel>, "dsi-color-format=RGB666_PACKED";
 168 +               rgb666 = <&panel>, "dsi-color-format=RGB666";
 169 +               rgb888 = <&panel>, "dsi-color-format=RGB888";
 170 +               one-lane = <0>,"+1";
 171 +               two-lane = <0>,"+2";
 172 +               three-lane = <0>,"+3";
 173 +               four-lane = <0>,"+4";
 174 +       };
 175 +
 176 +};