From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-184.mta0.migadu.com (out-184.mta0.migadu.com [91.218.175.184]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B4F2AA926 for ; Mon, 6 Oct 2025 15:30:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.184 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759764630; cv=none; b=RkDOz4o7RLEn5r6cPtn+52R/blcbqfVhtFzYo94XHqsLPx1k/4zxiE9RqcEao9sK46tKgaONLnQu0HcP7HvNFhYy8sTlWHGta+kUrhJQuacqeVUBSoBSCCSKoVCQMm3AVEtplbbOoeV7NUh9AmFczfHsydivoObp38ssNwuIvn4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759764630; c=relaxed/simple; bh=KfEpPX6KTwp0yN4qfLT4LXJb5WVsFjNmfSxhuw6//Tg=; h=Message-ID:Date:MIME-Version:Subject:From:To:Cc:References: In-Reply-To:Content-Type; b=RIm97tjfYkqs2/8RqllFXR4X2UehQZe03DK+KMjQPn00ml/DmAriVpb09yfTVE1G68HmY4d4rbBUljdg//kCHCpWEec7FsgkGPCo59f9wnWuC/3cksSZ0dp0atIpLOd7KSwIL46RNw6Vj8f7uHjo8Yte2+oMLEHA0EAph9c9e6I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=Fe/cNu0r; arc=none smtp.client-ip=91.218.175.184 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="Fe/cNu0r" Message-ID: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1759764625; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=nXyoKN4j7tjDil/ht3RE4A/98xpfn+XOg18nSC63YxI=; b=Fe/cNu0rr623OU3+9Ti9ilVTCZn9uAu/4R9seUwKi1wiqTULHwiFAtmOQfNqBi/s98yzjN GERZwA4JTt8odBfVuDE6VeHz2PmiluWbhv/obSptS1gcMUx/ZcQ3Us/dAVtmGn5r5OyVHg 0z4dog6KEnfJc3NI3xAgiS/dd3DYNyA= Date: Mon, 6 Oct 2025 16:30:19 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Subject: Re: [PATCH v13 3/4] drm/atomic-helper: Re-order bridge chain pre-enable and post-disable X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Aradhya Bhatia To: Vicente Bergas Cc: Laurent.pinchart@ideasonboard.com, airlied@gmail.com, alexander.sverdlin@siemens.com, andrzej.hajda@intel.com, devarsht@ti.com, dri-devel , jernej.skrabec@gmail.com, Jonas Karlman , Linux Kernel Mailing List , lumag@kernel.org, maarten.lankhorst@linux.intel.com, mripard@kernel.org, neil.armstrong@linaro.org, nm@ti.com, rfoss@kernel.org, simona@ffwll.ch, tomi.valkeinen@ideasonboard.com, tzimmermann@suse.de, vigneshr@ti.com, Dmitry Baryshkov , Douglas Anderson , Damon Ding , Sandy Huang , =?UTF-8?Q?Heiko_St=C3=BCbner?= , Andy Yan , Linux Rockchip Support List , Devarsh Thakkar References: Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Migadu-Flow: FLOW_OUT +rockchip maintainers Hi Vicente, all, I went through the drivers and the affected areas in the gru-kevin chromebook pipeline last week, but nothing has stood out. Pipeline: rockchip,display-subsystem / rk3399-vop (Big/Lite) (CRTC) -> rk3399-edp (Encoder) -> analogix_dp_core (Bridge) -> sharp,lq123p (edp-panel) I am unable to debug this further since I do not have the hardware. I could use some help, especially from folks who understand the hardware requirements better. On 11/09/25 09:01, Aradhya Bhatia wrote: > Hi Vicente, > > Thank you for the bisection and reporting the issue. > > On 10/09/25 16:17, Vicente Bergas wrote: >> Hi, >> this patch causes a regression. It has been reported in >> https://bugzilla.kernel.org/show_bug.cgi?id=220554 >> >> It affects the gru/kevin platform (arm64,RK3399) with the Panfrost DRM driver. > > I believe the Panfrost DRM driver may only be for the GPU. > > Based on the dts files in arm64/rockchip/, this is the pipeline of the > gru-kevin setup that I understand. > > rk3399-vop (Big/Lite) -> rk3399-edp -> sharp,lq123p (edp-panel) > > The setup seems to be using the drm/rockchip drivers for the display > controller and for the bridge. > >> >> When it boots in console mode, the blinking of the cursor keeps the display on. >> If it is turned off via /sys/class/graphics/fbcon/cursor_blink, then >> the display briefly shows each key press presented on screen for less >> than one second and then powers off. >> >> When starting the graphical mode (wayland), if there are no >> applications drawing on the screen, the only way to keep the display >> on is by continuously moving the mouse. >> > > Okay! > > I will have a look through the drivers. In the meanwhile, please do > report back if you find any other observations. > > -- Regards Aradhya