From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 2686E32D0CE; Fri, 13 Feb 2026 11:30:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770982254; cv=none; b=dvc7GoSiKzRAGW50uc+mvEi1kJ5zvBGShPRZVcnxCizPhN+TMs0t+2fRlBwKoT6H3nMAMamj3WbRTf/xCmrCqM+s/rfo6YTAPxGWZEE0fwleT3X5qeynJvKS/23DIy7JROuMYRO71f0Xen2ghfkRFl5+ZImygYGBgaMLnMsUHLQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770982254; c=relaxed/simple; bh=hixAC+AobzuSMNvmaInhVVPwXDPHawk8Xpy+/sSA30Q=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=M6NrPnqovx/rB1IzliftJzl1+atJ8/FM5zHVSz7wk1cgZUJ8XVWzCq1Wv5DonFE+9PkTR2RL4WHcdJ8KP2EyuvdQZoffjF3j/D07o8P9ffuJcw3m1FsjYCv4QOyskOA+B6emEVTlAzX/p2iLdwmCPrYr39wLtMOjRaHMQjUvVvY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=SKp2xfqF; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="SKp2xfqF" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BFAEDC16AAE; Fri, 13 Feb 2026 11:30:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1770982253; bh=hixAC+AobzuSMNvmaInhVVPwXDPHawk8Xpy+/sSA30Q=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=SKp2xfqFV6BAsMTYNLlyaYvBxXlWGnHOSfiM58JHBMVeuw0YywETlnSenzSGUI/Ia cH0TvSCc4ioR8z5xWUczqqEugeDZ4aqukQ9yrOkOwPOH08k8/YGM7tQ4DRV7ZJDu4s ee1cW4XOXcbYE4rQhU0ULBjsA6wQ5SG4LA/Kwe3tQYveKf2JhpGNBsJwMlLxNZYMXD abPOo34qgR5XYw3BKVpMw8vOM8zjF/RRGQZ2gBrwCv5ZOzoGH9cguNlsOcXdaNcEX2 1qj1Vhr9tVXVh9//jZb005oA5hw/eLVI6Gr4lWKe+Ih9c6zyZLPFYW7PGOevPo1yri XOCkVZz9DyUig== Message-ID: <14ee2088-032d-4cd4-8703-fd2f2d304b5b@kernel.org> Date: Fri, 13 Feb 2026 12:30:49 +0100 Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC v4 1/4] media: dt-bindings: Add Amlogic V4L2 video decoder To: Piotr Oniszczuk Cc: Zhentao Guo , Mauro Carvalho Chehab , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Neil Armstrong , Kevin Hilman , Jerome Brunet , Martin Blumenstingl , linux-media@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org References: <20260213-b4-s4-vdec-upstream-v4-0-c7112d00d662@amlogic.com> <20260213-b4-s4-vdec-upstream-v4-1-c7112d00d662@amlogic.com> <75e55ceb-e6dd-47b5-a829-66f6fbb3e13e@amlogic.com> <2f68ee18-e9d9-4da6-900c-93a7663b3c9d@kernel.org> <598c161c-d157-40e5-992c-912540589d7e@amlogic.com> <58d57a6c-7c69-4f5b-a4c2-f34ef0238511@kernel.org> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 13/02/2026 12:14, Piotr Oniszczuk wrote: >> >>>>> In short, canvas is a hardware IP inside the Amlogic SoC. The decoder IP >>>>> needs to access DDR through canvas IP, so we need to reference the >>>> Why decoder cannot access DDR directly? >>> The internal topology of the S4 chip is designed this way, we don't know >>> why our VLSI colleauges designed like this. But similar designs have >>> been removed in subsequent chips, eliminating the need to rely on a >>> common hardware IP. >> >> Quite poor explanation. Based on this, this as well could be entry in >> device reg lists. >> >> Anyway, I am done guessing, explain properly the hardware instead of >> answering with half-baked responses just so I will go away. >> >> >> Best regards, >> Krzysztof >> > > Krzysztof, > > May you pls explain me: what added value - to upstreaming aml video decoder - will be provided by giving NAK .... because canvas/DDR access details explanations are not enough detailed FOR YOU? NAK is a disagreement with this patch being merged, so there is no added value in it. What sort of added value do you expect from NAKs? Best regards, Krzysztof