Re: [PATCH 1/2] arm64: dts: exynos: Link DSI panel at port@1 for TM2 board

Hi Andrzej,

On Tue, Jan 11, 2022 at 2:05 PM Andrzej Hajda andrzej.hajda@intel.com wrote:

+CC: dri-devel

On 10.01.2022 16:27, Jagan Teki wrote:

...

TM2 board DSI pipeline has input from MIC and output to s6e3ha2 panel.

The existing pipeline has child nodes of ports, panel and MIC is remote-endpoint reference of port@0 of ports.

Adding panel as another child node to DSI is unconventional as pipeline has ports child. However it can be true if MIC is added inside port node like this.

dsi { compatible = "samsung,exynos5433-mipi-dsi"; #address-cells = <1>; #size-cells = <0>;

  port {
          dsi_to_mic: endpoint {
                  remote-endpoint = <&mic_to_dsi>;
          };
  };

  panel@0 {
          compatible = "samsung,s6e3hf2";
             reg = <0>;
             vdd3-supply = <&ldo27_reg>;
             vci-supply = <&ldo28_reg>;
             reset-gpios = <&gpg0 0 GPIO_ACTIVE_LOW>;
             enable-gpios = <&gpf1 5 GPIO_ACTIVE_HIGH>;
  };

};

The above pipeline is proper but it requires the DSI input MIC pipeline to update.

This patch is trying to add panel at port@1 so-that the entire pipeline before to panel output is untouched.

Reported-by: Marek Szyprowski m.szyprowski@samsung.com Signed-off-by: Jagan Teki jagan@amarulasolutions.com

---

arch/arm64/boot/dts/exynos/exynos5433-tm2.dts | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)

diff --git a/arch/arm64/boot/dts/exynos/exynos5433-tm2.dts b/arch/arm64/boot/dts/exynos/exynos5433-tm2.dts index aca01709fd29..e13210c8d7e0 100644 --- a/arch/arm64/boot/dts/exynos/exynos5433-tm2.dts +++ b/arch/arm64/boot/dts/exynos/exynos5433-tm2.dts @@ -53,6 +53,16 @@ &cmu_disp { };

&dsi {

• ports {
  

•         port@1 {
  

•                 reg = <1>;
  

•                 dsi_out_panel: endpoint {
  

•                         remote-endpoint = <&dsi_in_panel>;
  

•                 };
  

•         };
  

• };
  

• panel@0 {
          compatible = "samsung,s6e3ha2";
          reg = <0>;
  

@@ -60,6 +70,12 @@ panel@0 { vci-supply = <&ldo28_reg>; reset-gpios = <&gpg0 0 GPIO_ACTIVE_LOW>; enable-gpios = <&gpf1 5 GPIO_ACTIVE_HIGH>;

•         port {
  

•                 dsi_in_panel: endpoint {
  

•                         remote-endpoint = <&dsi_out_panel>;
  

•                 };
  

•         };
  

As I already wrote in Exynos thread, DSI host has already parent-child relation with the panel - DSI host knows well who is connected to it. Adding another links between them is redundant and has no value added.

I have already answered in Exynos thread[1] how could you deal with the issue, you have.

I have commented on this thread for better understanding. Please have a look and respond.

Thanks, Jagan.