From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) (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 E51C82EFD94 for ; Wed, 18 Jun 2025 16:27:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.167.242.64 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750264055; cv=none; b=ICrcBLy4YSI/1uWxbCLS9tBn64n6BfJetHj5heYucB7z1WRCuvL5zCfHRjTN0bmhq2O4BsJ/GNY1VVFu5SjH+w5lipWUIWRB6xRPCR8ZoN5mfHdrig/WV+x55Ly6aMjU6qnucKNtPC1BmAaLr5uHYMbEmWr7OgUPJw4vSIJWmNc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750264055; c=relaxed/simple; bh=igrkEFwePOxl6XHAUB3IfaNn51cskvroAiAmSAvq5cE=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=dT/SuEGqYzFCv3Pvd4aUzSr54J1+2Qf78cF8WSNNfy1c5ItRl61A2McB0imS8yWl3sxupS91VWPBorJPydwGaLJUmPWD4mwewsw/5IZFH1t7TpHN7jwzi3Ys1PYxtgOVI7rlGiSEKBD1QAy5c7lYponJ6vwlckWPo14esZsr/dQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=ideasonboard.com; spf=pass smtp.mailfrom=ideasonboard.com; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b=b5XPKKAY; arc=none smtp.client-ip=213.167.242.64 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="b5XPKKAY" Received: from [192.168.88.20] (91-158-153-178.elisa-laajakaista.fi [91.158.153.178]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id A081622A; Wed, 18 Jun 2025 18:27:17 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1750264038; bh=igrkEFwePOxl6XHAUB3IfaNn51cskvroAiAmSAvq5cE=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=b5XPKKAYEx0sLDqFIb7zUHMT4dt65VfB4sABUOrwNIO4nuS0TxziwrantTAgGNhic 6WlcFzaMvFUZbzX7LqNuOE6yX5tVYrVB6Ql0ml/UDKBLuFKAZYvbtFZ10O1AmioLct yI9e1BHV4+LwXau4Zep5sbVBZjJTlNF4ED1P9g7M= Message-ID: <026c9b37-ae79-416c-b57d-be98f7e91f36@ideasonboard.com> Date: Wed, 18 Jun 2025 19:27:27 +0300 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v13 3/4] drm/atomic-helper: Re-order bridge chain pre-enable and post-disable To: Marek Szyprowski , Maxime Ripard Cc: Aradhya Bhatia , DRI Development List , Linux Kernel List , Nishanth Menon , Vignesh Raghavendra , Devarsh Thakkar , Jayesh Choudhary , Alexander Sverdlin , Dmitry Baryshkov , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Thomas Zimmermann , David Airlie , Simona Vetter References: <20250605171524.27222-1-aradhya.bhatia@linux.dev> <20250605171524.27222-4-aradhya.bhatia@linux.dev> <2c51cf39-13cb-413f-8dd5-53bc1c11467a@samsung.com> <306f142f-f9c9-44ab-a5b9-c71db76b2b80@ideasonboard.com> <3adb1d12-7cd5-4beb-9978-c3cae702f338@ideasonboard.com> <20250618-silent-oriole-of-fertility-3cbbd6@houat> <3c5d43a2-fdbe-4cbe-bf45-09bfcb18dcb3@samsung.com> Content-Language: en-US From: Tomi Valkeinen Autocrypt: addr=tomi.valkeinen@ideasonboard.com; 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charset=UTF-8 Content-Transfer-Encoding: 8bit On 18/06/2025 13:01, Marek Szyprowski wrote: > I've finally found where is the problem! It turned out that the issue is > in the exynos_drm_fimd driver, in the code for enabling the display port > clock (fimd_dp_clock_enable() >  function). It touches FIMD regs, but it was not guarded with FIMD's > runtime pm calls and after the $subject change it happened that > exynos_dp/analogix_dp code called the clock enable/disable when FIMD > driver (which implements the CRTC object) was not runtime resumed. > Previously all dp clock handling was done when CRTC was enabled, thus > the FIMD device was in the resumed runtime pm state. We have another issue the this patch: i.MX8MM (and MP) seem to have a problem with DSI, which is using the samsung-dsim.c driver. For me, the first time I run kmstest I get a black screen. The second time I get a display, but it's horizontally in the wrong place. Perhaps you have an idea about this if you're familiar with the samsung-dsim?. The issue seems to be that earlier the order was: mxsfb_crtc_atomic_enable() samsung_dsim_atomic_pre_enable() samsung_dsim_atomic_enable() now the order is: samsung_dsim_atomic_pre_enable() mxsfb_crtc_atomic_enable() samsung_dsim_atomic_enable() If I move the samsung_dsim_init() call from samsung_dsim_atomic_pre_enable() to samsung_dsim_atomic_enable(), it starts to work. My guess is that the DSI init requires a pixel stream from the crtc, and now that the (pre)init is done without the pixel stream, it goes wrong. But this is purely a guess so far. I also see that the samsung_dsim_init() call is behind "!samsung_dsim_hw_is_exynos()", so you probably don't hit this issue... Tomi