linux-kernel - drm pipe line fails to trigger drm bridge attach function for samsung-dsim.c in 6.6 kernel

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Message-ID:
 <CWXP123MB5396AD28A9BF01B74A1A2DB78DDE2@CWXP123MB5396.GBRP123.PROD.OUTLOOK.COM>
Date: Tue, 18 Mar 2025 11:28:42 +0000
From: Koteswara Nelakurthi <KNelakurthi@...sor.co.uk>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Thomas Zimmermann
	<tzimmermann@...e.de>, David Airlie <airlied@...il.com>, Simona Vetter
	<simona@...ll.ch>, Andrzej Hajda <andrzej.hajda@...el.com>, Neil Armstrong
	<neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>, Laurent Pinchart
	<Laurent.pinchart@...asonboard.com>, Jonas Karlman <jonas@...boo.se>, Jernej
 Skrabec <jernej.skrabec@...il.com>, Douglas Anderson <dianders@...omium.org>
CC: Herve Codina <herve.codina@...tlin.com>, "dri-devel@...ts.freedesktop.org"
	<dri-devel@...ts.freedesktop.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, Maxime Ripard <mripard@...nel.org>
Subject: drm pipe line fails to trigger drm bridge attach function for
 samsung-dsim.c in 6.6 kernel

Hi,

Requesting to please go through below mail that deals with MIPI DSI display panel bringup activity.
Jd9365da  is  a MIPI dsi panel connected to nxp based imx8mm core board directly without any bridge and it's connected through MIPI DSIM (SAMSUNG)  (linux-6.6/drivers/gpu/drm/Bridge/Samsung-dsim.c) software interface.
Prepared Scarthgap yocto BSP images for imx8mm core based NXP  board  running with linux-6.6 kernel version and booted the board.
The below log in the boot sequence  confirm panel is attached with dsim host controller.
{{
[    2.568380] samsung-dsim 32e10000.dsi: [drm:samsung_dsim_host_attach] Attached display-8hd-a device // printed from samsung_dsim_host_attach()  in drivers/gpu/drm/bridge/samsung-dsim.c
}}
But The issue I am facing currently is DRM pipeline is failing to trigger struct drm_bridge_funcs attach() definition i.e Samsung_dsim_attach() that in turn invokes drm_bridge_attach() and
it helps in triggering Jd9365da drm_panel specific prepare/enable functions subsequently.
I attached a debug log added  to Samsung-dsim.c file along with a jd9365da panel file (with debug logs) and boot log for reference. I attached jd9365da dts file too for reference
I request to please go through attached files and boot logs and please provide input for further debugging.
I attached an arch/arm64/boot/dts/freescale/imx8mm.dtsi file (that contains mipi-dsi entries for Samsung-dsim.c) .

Kind Regards
nelakurthi

Content of type "text/html" skipped

Download attachment "imx8mm.dtsi" of type "application/octet-stream" (47573 bytes)

Download attachment "imx8mm-jd9365da-mipi-dsi.dts" of type "application/octet-stream" (2562 bytes)

View attachment "panel-jadard-jd9365da-h3.c" of type "text/plain" (25673 bytes)

View attachment "samsung-dsim.c" of type "text/plain" (59045 bytes)

View attachment "samsung-dsim-jd9365da-bootlog.txt" of type "text/plain" (27100 bytes)