Connect MIPI DSI Panasonic display to VIM3

s1579 · August 6, 2021, 1:57pm

Hi guys,
I’m going to connect a 10inch DSI display to VIM3.

I bought VVX10F004B00 panel.
This panel is supported by linux-mainline 5.12

"For simple panels that don’t require custom programming sequences there is panel-simple.c, but that is unlikely to be applicable for the DSI panel in any phone/tablet. Instead, for panels requiring custom programming sequences, a new panel driver is written.

github.com

torvalds/linux/blob/master/Documentation/devicetree/bindings/display/panel/panel-simple-dsi.yaml

# SPDX-License-Identifier: (GPL-2.0-only or BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/display/panel/panel-simple-dsi.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Simple DSI panels with a single power-supply

maintainers:
  - Thierry Reding <thierry.reding@gmail.com>
  - Sam Ravnborg <sam@ravnborg.org>

description: |
  This binding file is a collection of the DSI panels that
  requires only a single power-supply.
  There are optionally a backlight and an enable GPIO.
  The panel may use an OF graph binding for the association to the display,
  or it may be a direct child node of the display.

  If the panel is more advanced a dedicated binding file is required.

This file has been truncated. show original

"

I’ve attached panel’s datasheet. 808.5 KB file on MEGA

Also, I’ve made a custom 30P-0.5 to DIP converter.

I have some questions ?

what is the DSI logic signal voltage ? My panel supports 2V signaling. Thus I need to use level shifters ?
Could you please suggest a correct DTS for my panel ?
I have an example from the driver description. Is it correct for VIM3?

dsi {
      #address-cells = <1>;
      #size-cells = <0>;
      panel@0 {
        compatible = "panasonic,vvx10f034n00";
        reg = <0>;
        power-supply = <&vcc_lcd_reg>;
        port {
          panel: endpoint {
            remote-endpoint = <&ltdc_out>;
          };
        };
      };
    };

Thank you in advance.

s1579 · August 6, 2021, 8:11pm

Answering myself regarding MIPI DSI signal voltage.

According “A311D_Quick_Reference_Manual_01_Wesion.pdf”
Recommended Operating Conditions
AVDD18
1.8V AVDD for HDMI, USB, SARADC, PCIE, CVBS, AUDIO, MIPI_DSI, MIPI_CSI and ETHERNET phy.
Min. 1.71V, Typ. 1.80V Max. 1.89V

My display uses DSI 2.0-2.8V signals.

Does it mean that I need to use level shifter ?