On 10/28/25 2:42 PM, Cristian Ciocaltea wrote: > 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.
This seems to have been already addressed: https://lore.kernel.org/all/20251017-drm-bridge-alloc-getput-bridge-connector-fix-hdmi_cec-v2-0-667abf6d4...@bootlin.com/ > Regards, > Cristian
