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Tue, 28 Oct 2025 13:42:49 +0100 (CET) Message-ID: <410fa913-e86b-4ffd-9d79-ce804f0271ff@collabora.com> Date: Tue, 28 Oct 2025 14:42:49 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 0/6] Add HDMI CEC support to Rockchip RK3588/RK3576 SoCs To: Mark Brown Cc: Sandy Huang , =?UTF-8?Q?Heiko_St=C3=BCbner?= , Andy Yan , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Andrzej Hajda , Neil Armstrong , Robert Foss , Dmitry Baryshkov , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Catalin Marinas , Will Deacon , kernel@collabora.com, dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org, Algea Cao , Derek Foreman , Daniel Stone , Aishwarya.TCV@arm.com References: <20250903-rk3588-hdmi-cec-v4-0-fa25163c4b08@collabora.com> <6f3f126d-72c1-48cb-a9c8-8d354af2a3d5@sirena.org.uk> Content-Language: en-US From: Cristian Ciocaltea In-Reply-To: <6f3f126d-72c1-48cb-a9c8-8d354af2a3d5@sirena.org.uk> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251028_054254_677579_01F3E5C2 X-CRM114-Status: GOOD ( 16.62 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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