No mipi dsi clock signal for jd9365da panel connected to imx8mm core board

knelakurthi · January 10, 2025, 3:42pm

Hi,
MIPI DSI clock signal is not continuous on oscilloscope when jd9365da panel is connected to imx8mm core board. Please refer below link to check for boot log and dts/jd9365da panel driver code along with mipi dsi signal jpg file. requesting to provide input to debug on mipi dsi clock signal issue?

https://drive.google.com/drive/folders/10thMKCW6-adaQ3CnQ0uV5y7oXwpp40g6?usp=drive_link

regards
knelakurth

Nasca · January 14, 2025, 1:29am

Please specify the product and details of the screen.

knelakurthi · January 14, 2025, 8:43am

Dear Nasca,
jd9365da is TFT lcd panel connected to nxp engicam board directly through MIPI DSI interface running with imx8mm core board and no bridge exists on board. jd9365da driver panel code is ported from below link. Please refer previous comment link for further code reference.

github.com

edgeble/kernel/blob/linux-5.10-gen-rkr3.4/drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (c) 2019 Radxa Limited
 * Copyright (c) 2022 Edgeble AI Technologies Pvt. Ltd.
 *
 * Author:
 * - Jagan Teki <jagan@amarulasolutions.com>
 * - Stephen Chen <stephen@radxa.com>
 */

#include <drm/drm_mipi_dsi.h>
#include <drm/drm_modes.h>
#include <drm/drm_panel.h>
#include <drm/drm_print.h>

#include <linux/gpio/consumer.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/regulator/consumer.h>

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regards
knela

knelakurthi · January 17, 2025, 4:06pm

Dear Nasca

please let me know if you have any input?

regards
knela