> ## Documentation Index
> Fetch the complete documentation index at: https://dragonwingdocs.qualcomm.com/llms.txt
> Use this file to discover all available pages before exploring further.

# CQ2390/IQ2390

> [tab] CQ2390
>
> > [!NOTE]
> >
> > For supported interfaces and capabilities, see [CQ2390 display specifications](https://dragonwingdocs.qualcomm.com/Technologies/Display/display-specs-cq2390-iq2390.md#display-features).
>
> ## Set up the DSI display
>
> The display subsystem uses the Weston Wayland compositor and `libdrm` to interact with the DPU driver and render Wayland client applications. On the CQ2390 evaluation kit (EVK), connect the DSI panel to the display daughtercard before powering on the board.
>
> ![Figure: CQ2390 DSI display setup workflow](https://mintcdn.com/qualcomm-prod/hlNuX08-pFFtVn68/Technologies/Display/media/qli-display/cq2390-dsi-setup-workflow.svg?fit=max\&auto=format\&n=hlNuX08-pFFtVn68\&q=85\&s=d0095ffdbd12608624b483e2e08c9e79)
>
> **Figure: CQ2390 DSI display setup workflow**
>
> **Prerequisites**
>
> * CQ2390 EVK with the [capacitive touch panel (CTP) display daughtercard](https://dragonwingdocs.qualcomm.com/Technologies/Display/display-specs-cq2390-iq2390.md#display-daughtercard-ctp-dsi-d-phy) installed
> * DSI panel and a compatible cable for the daughtercard's 50-pin flexible printed circuit (FPC) connector
> * The EVK power supply
> * A Qualcomm Linux image for the CQ2390 EVK installed on the device
>
> ### Connect and verify the DSI display
>
> 1. Power off the EVK and disconnect its power supply before connecting the panel or changing the dual inline package (DIP) switches.
>
> 2. Verify that the display routing switches are in their default positions for the CTP display daughtercard.
>
>    **Table: Default CQ2390 display switch states**
>
>    | **Switch** | **Default state** | **Purpose** |
>    | - | - | - |
>    | SW3-5 | OFF | Routes DSI0 to the board-to-board (B2B) connector used by the display daughtercard. |
>    | SW6-1 | OFF | Routes the pulse-width modulation (PWM) signal to the display. |
>
> 3. Check that the display daughtercard is seated on the EVK's B2B connector. Connect the DSI panel cable to the daughtercard's 50-pin FPC connector and check that the cable is fully seated. The following figure shows the panel beside the EVK board, with the display card highlighted:
>
>    ![CQ2390 DSI panel beside the EVK board, with the display card highlighted](https://mintlify.s3.us-west-1.amazonaws.com/qualcomm-prod/Technologies/Display/media/qli-display/cq2390-dsi-panel-setup.png)
>
>    **Figure: CQ2390 DSI panel setup**
>
> 4. Connect the EVK power supply and power on the board. Weston launches automatically during boot.
>
> 5. Verify the display.
>
>    The following Weston flower pattern displays on the DSI panel, indicating successful setup.
>
>    ![Figure: Weston flower pattern](https://mintcdn.com/qualcomm-prod/mGpYCfBsZaJSFIEo/Technologies/Display/media/qli-display/Weston_flower_pattern.PNG?fit=max\&auto=format\&n=mGpYCfBsZaJSFIEo\&q=85\&s=7be04aa671e4986b111a23843ab2033c)
>
>    **Figure: Weston flower pattern**
>
>    > [!NOTE]
>    >
>    > If you are experiencing a no-display issue, see [Debug the CQ2390 DSI display](https://dragonwingdocs.qualcomm.com/Technologies/Display/troubleshoot-debug-dsi-cq2390.md).
>
> ## Verify the display functionality
>
> After you have set up the display, run the following test applications to verify the display functionality. Use the expected mode from the [CQ2390 display specifications](https://dragonwingdocs.qualcomm.com/Technologies/Display/display-specs-cq2390-iq2390.md#display-features).
>
> > [card] [Run Weston simple EGL](https://dragonwingdocs.qualcomm.com/Technologies/Display/run-weston-simple-egl.md)
> >
> > Verify composition and rendering of frames on your display.
>
> > [card] [Run DRM modetest](https://dragonwingdocs.qualcomm.com/Technologies/Display/run-drm-modetest.md)
> >
> > Verify the display driver topology and DPU paths.

> [tab] IQ2390