From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from ixit.cz (ixit.cz [185.100.197.86]) (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 AC51B239562; Sat, 17 Jan 2026 15:54:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.100.197.86 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768665254; cv=none; b=ZqoBVoX+H3QMXUh/QmaoiqS+C9axT9pd8HjMauZHmweFdpCuag86yv77S0ENQNAAwP9WgpVO4JOin08EVZ77TRMdjRVrZ6nNMCY0jug/lr1m76Mr3mt5Css7IhEZLZPTw9xnN/zBvajcVqhorJDcjuX67QytkJBcLL3vr2XY4UI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768665254; c=relaxed/simple; bh=37xj4BSSul+wTxNrGjktuT/LxaChuM8/mPL0mZQ1LAI=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=ejHZVtam2FGgZUP/EMwVDr0pfoR2311tJhyg4MMpN9FgnBnwJJ5+UgIZM5F1BCDKJVPu8YRoXVAzVTdCb+ueDNo2u5RI83aEwD+A2lkoru23nKuCLKlS2lPZXovBR3yByb2VWhGt2gpQbw9JH0lMMNwYzCXZ8WbO1ZCQCfa1Pjs= ARC-Authentication-Results:i=1; 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bh=OhioEov5Is/f27kPShxfxfNl2hc2wXiOoEMELtd3/+I=; b=b2CXADe7dk9EO9K78WugPHVKhyLajevCz3San8FRjAyVJE86WZklslxMqJo6sCp0lK0kT0 FaJQE0UOs/4OuswNy9acm8nh2vC6w2AIQj4bG+KDayAwrUCdCGQosfwE1bXCj4VgGn6OQ9 nIw3iVe24UWmIqgQguhOaPpW9BPPUmA= Message-ID: Date: Sat, 17 Jan 2026 16:53:56 +0100 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 v3 4/8] media: qcom: camss: Initialize lanes after lane configuration is available To: Robert Foss , Todor Tomov , Bryan O'Donoghue , Vladimir Zapolskiy , Mauro Carvalho Chehab , Luca Weiss , Petr Hodina , Casey Connolly , "Dr. Git" Cc: Konrad Dybcio , Joel Selvaraj , Kieran Bingham , Sakari Ailus , linux-media@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, phone-devel@vger.kernel.org References: <20260117-qcom-cphy-v3-0-8ce76a06f7db@ixit.cz> <20260117-qcom-cphy-v3-4-8ce76a06f7db@ixit.cz> Content-Language: en-US From: David Heidelberg Autocrypt: addr=david@ixit.cz; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 17/01/2026 16:36, David Heidelberg via B4 Relay wrote: > From: Petr Hodina > > The lanes must not be initialized before the driver has access to > the lane configuration, as it depends on whether D-PHY or C-PHY mode > is in use. Move the lane initialization to a later stage where the > configuration structures are available. > > Signed-off-by: Petr Hodina > Signed-off-by: David Heidelberg > --- > .../platform/qcom/camss/camss-csiphy-3ph-1-0.c | 91 ++++++++++++++-------- > 1 file changed, 57 insertions(+), 34 deletions(-) > Now we going to setup D/C-PHY in lanes_enable, which I perceive as sub-optimal, because when C-PHY is set on the device-tree level, while the device may handle both D-PHY and C-PHY, the intent is use C-PHY only when available, because of the advantages, where as disadvantages are mainly in the implementation complexity (which is already done). Thus it would be most optimal to take care of the configuration in the csiphy init, which starts at point, where the device-tree properties aren't parsed yet. I tried to do shuffling in camss_probe to make csiphy->cfg.csi2->lane_cfg available in the subdevice (csiphy) init phase. Everytime I moved camss_parse_ports earlier or camss_init_subdevices later I got into some kind of trouble, thus I assume current solution is (at least until some rewrite) best. David