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Tue, 28 Oct 2025 15:57:03 +0100 (CET) Message-ID: <63003a7e-8d3d-433a-8a44-54fe8740bc3a@collabora.com> Date: Tue, 28 Oct 2025 16:57:03 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 0/6] Add HDMI CEC support to Rockchip RK3588/RK3576 SoCs From: Cristian Ciocaltea 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> <410fa913-e86b-4ffd-9d79-ce804f0271ff@collabora.com> Content-Language: en-US In-Reply-To: <410fa913-e86b-4ffd-9d79-ce804f0271ff@collabora.com> 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_075708_837802_2D884504 X-CRM114-Status: GOOD ( 16.15 ) 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 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-v2-0-667abf6d47c0@bootlin.com/ > Regards, > Cristian