linux-kernel - Re: [PATCH v4 0/6] Add HDMI CEC support to Rockchip RK3588/RK3576 SoCs

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Message-ID: <6f3f126d-72c1-48cb-a9c8-8d354af2a3d5@sirena.org.uk>
Date: Tue, 28 Oct 2025 12:38:28 +0000
From: Mark Brown <broonie@...nel.org>
To: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
Cc: Sandy Huang <hjc@...k-chips.com>,
	Heiko Stübner <heiko@...ech.de>,
	Andy Yan <andy.yan@...k-chips.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	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>,
	Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
	Jonas Karlman <jonas@...boo.se>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>, kernel@...labora.com,
	dri-devel@...ts.freedesktop.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Algea Cao <algea.cao@...k-chips.com>,
	Derek Foreman <derek.foreman@...labora.com>,
	Daniel Stone <daniels@...labora.com>, Aishwarya.TCV@....com
Subject: Re: [PATCH v4 0/6] Add HDMI CEC support to Rockchip RK3588/RK3576
 SoCs

On Wed, Sep 03, 2025 at 09:50:58PM +0300, Cristian Ciocaltea wrote:
> The first patch in the series implements the CEC capability of the
> Synopsys DesignWare HDMI QP TX controller found in RK3588 & RK3576 Socs.
> This is based on the downstream code, but rewritten on top of the CEC
> helpers added recently to the DRM HDMI connector framework.

For the past couple of weeks we've been seeing various instability with
the graphics drivers on the Rock 5B in -next, the most common system is
that we get faults in code that looks suspiciously relevant to this
series:

<6>[   17.353368] rockchip-drm display-subsystem: bound fdd90000.vop (ops vop2_component_ops [rockchipdrm])
<6>[   17.355237] dwhdmiqp-rockchip fde80000.hdmi: registered DesignWare HDMI QP I2C bus driver
/ # <1>[   17.357803] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000098

...

<4>[   17.372390] Hardware name: Radxa ROCK 5B (DT)

...

<4>[   17.382082] Call trace:
<4>[   17.382317]  drm_bridge_connector_hdmi_cec_init+0x8/0x38 [drm_display_helper] (P)
<4>[   17.383003]  drm_bridge_connector_init+0x658/0x678 [drm_display_helper]
<4>[   17.383612]  dw_hdmi_qp_rockchip_bind+0x35c/0x4d8 [rockchipdrm]
<4>[   17.384159]  component_bind_all+0x118/0x248
<4>[   17.384550]  rockchip_drm_bind+0xb4/0x20c [rockchipdrm]
<4>[   17.385034]  try_to_bring_up_aggregate_device+0x164/0x1d0
<4>[   17.385528]  component_master_add_with_match+0xc4/0x104
<4>[   17.386008]  rockchip_drm_platform_probe+0x1f8/0x31c [rockchipdrm]

(from today's -next, 

Unfortunately we haven't managed to point at a specific commit, it looks
like this might be triggered by multiple serieses interacting with each
other.  I'm not sure what other information might be useful here?

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