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

[Cristian Ciocaltea <cristian.ciocaltea@collabora.com>]

Hi Mark,

On 10/28/25 2:38 PM, Mark Brown wrote:
> 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?

Thanks for reporting, I will investigate.

Regards,
Cristian