linux-kernel - Re: [PATCH v8 00/18] Apply drm_bridge_connector and panel

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Message-ID: <6571983.R56niFO833@diego>
Date: Mon, 19 Jan 2026 17:06:46 +0100
From: Heiko Stübner <heiko@...ech.de>
To: andrzej.hajda@...el.com, neil.armstrong@...aro.org, rfoss@...nel.org,
 Damon Ding <damon.ding@...k-chips.com>
Cc: Laurent.pinchart@...asonboard.com, jonas@...boo.se,
 jernej.skrabec@...il.com, maarten.lankhorst@...ux.intel.com,
 mripard@...nel.org, tzimmermann@...e.de, airlied@...il.com, simona@...ll.ch,
 shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
 festevam@...il.com, inki.dae@...sung.com, sw0312.kim@...sung.com,
 kyungmin.park@...sung.com, krzk@...nel.org, alim.akhtar@...sung.com,
 jingoohan1@...il.com, p.zabel@...gutronix.de, hjc@...k-chips.com,
 andy.yan@...k-chips.com, dmitry.baryshkov@....qualcomm.com,
 dianders@...omium.org, m.szyprowski@...sung.com, luca.ceresoli@...tlin.com,
 jani.nikula@...el.com, linux-kernel@...r.kernel.org,
 dri-devel@...ts.freedesktop.org, imx@...ts.linux.dev,
 linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org,
 linux-rockchip@...ts.infradead.org, Damon Ding <damon.ding@...k-chips.com>
Subject:
 Re: [PATCH v8 00/18] Apply drm_bridge_connector and panel_bridge helper for
 the Analogix DP driver

Hi Damon,

Am Mittwoch, 17. Dezember 2025, 10:33:03 Mitteleuropäische Normalzeit schrieb Damon Ding:
> PATCH 1 is to ensure the last bridge declares OP_EDID or OP_MODES or both.
> PATCH 2 is a small format optimization for struct analogid_dp_device.
> PATCH 3 is to perform mode setting in &drm_bridge_funcs.atomic_enable.
> PATCH 4 is to add a new parameter to store the point of next bridge.
> PATCH 5 is to make legacy bridge driver more universal.
> PATCH 6-11 are preparations for apply drm_bridge_connector helper.
> PATCH 12 is to apply the drm_bridge_connector helper.
> PATCH 13-15 are to move the panel/bridge parsing to the Analogix side.
> PATCH 16 is to attach the next bridge on Analogix side uniformly.
> PATCH 17-18 are to apply the panel_bridge helper.

On top of all the recent bridge-related commits, this series still works
on my rk3588-eDP board - when the display is plugged in on boot.

As that is the current state we also had before, this series:
Tested-by: Heiko Stuebner <heiko@...ech.de> on rk3588


======
!!! The following should not hold up this series though, because the
analogix-dp not handling hotplug, is also the current state already!!!
======

However, actually hotplugging the device does not seem to work.

With the hpd-gpio inside a dp-connector node.


(1) When booting connected and unplugging the display I get:

[   42.725888] rockchip-dp fdec0000.edp: Rx Max Link Rate is abnormal :0 !
[   42.733325] rockchip-dp fdec0000.edp: Rx Max Lane count is abnormal :0 !
[   42.764853] rockchip-dp fdec0000.edp: LT link start failed!
[   42.771105] rockchip-dp fdec0000.edp: eDP link training failed (-110)
[   42.778329] rockchip-dp fdec0000.edp: unable to do link train, ret=-110
[   42.785747] [drm:analogix_dp_bridge_atomic_enable] *ERROR* dp commit error, ret = -110
( ... repeasts a bunch of times ... )
[   43.284897] rockchip-dp fdec0000.edp: failed to set bridge, retry: 4
[   43.292045] rockchip-dp fdec0000.edp: too many times retry set bridge, give it up

plugging the eDP back in reenables the display successfully though.

(2) Booting with the display unplugged

Same messages as above, but plugging the display in for the first time
does not create an output.

I'll try to dig more, but if you have an idea, what I should look at, I'd,
be really grateful.


Thanks
Heiko