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 C8A50D307 for ; Thu, 9 Nov 2023 08:49:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="NjPlY3B3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 48B76C433C9; Thu, 9 Nov 2023 08:49:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1699519768; bh=XUxFVYX3xj3a0npLAnAeHfCNKyEkyITQ56SMcsXG+ro=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=NjPlY3B3oC2X9P4VgYbqfeC86oQ9C2XvJAUGZj7bj+9xUKXt+d9wOtxtBXQEZKPVa B2Mok/zC9TW+jbD5mq8b6PvriPJ2dHuHKyKlsAZ5/1QPcQ1z9pyzUbIGr2F/aBPsm1 X+mC8gP36j1CpdhVKkRi8DUCgiNE+zL00K/whxQ8crWrwNYvGvYt4p54xOdqNM3qsC FoN0BUN9iayf9Gl/C+WiYTywxBKabFS7hwY9u/URlN22lWJJ4Vq5O6uJkKnPSme2YS SgqHFEryWBay6EecGCZwYh8YLs+PjDaUfiw41ZptNb2QRtmGg5/VX7XAb61rKG6hFS lD8eTkL74y+VA== Message-ID: <48e25d8c-096a-4864-8105-5675bf2458d9@kernel.org> Date: Thu, 9 Nov 2023 09:49:22 +0100 Precedence: bulk X-Mailing-List: dmaengine@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] dmaengine: pl330: set subsys_initcall level Content-Language: en-US To: "bumyong.lee" , 'Vinod Koul' , 'Philipp Zabel' Cc: dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org References: <20231031034854.115624-1-bumyong.lee@samsung.com> <0db70a26-bc3f-48f4-acfc-9fc7f960252f@kernel.org> <002301da12c6$11465ee0$33d31ca0$@samsung.com> From: Krzysztof Kozlowski Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 09/11/2023 05:34, bumyong.lee wrote: >> On 31/10/2023 04:48, Bumyong Lee wrote: >>> module_amba_driver is macro for module_init/exit module_init is >>> device_initcall level when it configured with built-in driver. >>> >>> pl330 is dmaengine driver. because slave drivers depend on dmaengine >>> drivers, dmaengine drivers is more appropriate subsys_initcall. >> >> The same is true for all resource providers and we do not manually order >> them via initcalls. Sorry, this was fine as is. Implement defer for your >> drivers, not hack initcalls. If you upstreamed them, then it could even >> work out of the box for you . >> >> Best regards, >> Krzysztof > > I agree with your opinion that the drivers using dma-engine should implement to defer probe when dma is not initialized yet in their probe function execution. Please wrap your emails to match mailing list discussion style. > But if dma-engine driver and slave driver is the same initcall level, then a lot of slave drivers should defer probe every time of boot. Which and how many drivers have this problem? > > I think it's better to use subsys_initcall for pl330 like other dmaengine drivers regardless of slave driver's implementation in order to reduce defer operations. pl330 requires other resources, so manual ordering via initcalls leads to other problems. You solve one, create others. And no analysis of practical impact was provided in commit msg. Best regards, Krzysztof