From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A40E7C678D5 for ; Thu, 12 Jan 2023 14:42:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238542AbjALOmd (ORCPT ); Thu, 12 Jan 2023 09:42:33 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37662 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239535AbjALOmN (ORCPT ); Thu, 12 Jan 2023 09:42:13 -0500 Received: from wout3-smtp.messagingengine.com (wout3-smtp.messagingengine.com [64.147.123.19]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 561923C70B; Thu, 12 Jan 2023 06:31:42 -0800 (PST) Received: from compute6.internal (compute6.nyi.internal [10.202.2.47]) by mailout.west.internal (Postfix) with ESMTP id 2121532001C6; Thu, 12 Jan 2023 09:31:41 -0500 (EST) Received: from imap51 ([10.202.2.101]) by compute6.internal (MEProxy); Thu, 12 Jan 2023 09:31:41 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=arndb.de; h=cc :cc:content-type:date:date:from:from:in-reply-to:in-reply-to :message-id:mime-version:references:reply-to:sender:subject :subject:to:to; s=fm2; t=1673533900; x=1673620300; bh=XcokMuesyw xRllOXpayJil3m4/0GhcocSOMeW29gsw4=; b=MLiwNAi8tcaeCi9MXc2YWFpOBf Gj0dNvvVQ9uzseSNWXiPXH0wXgkI/LOafa68F0NExmTfhCLgg8/M32DSVEnz9A7r rcEqQJ33E5Le2+GyGeM27kNK/9XVc1t0GvaTQlV7Mr7pQTO81lqGiewGflsWh/Dh pv3cVbkGZUm2j6xjgfDWnh9NNaPsHrsQdIsA2lR9o7HbNrabMFTGkWONTA03Uzgy 3KgIdHsuQBadMigHriIx17ycPmnNWGxJwhY1UEJFUPvyex+pwgb9LmImEuNql7Am Bop7Jdj9DwpQRdNcTbWQ7vv4upEaC333BkEzygdIKJB98L+McTJOiYk9r/uw== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:cc:content-type:date:date:feedback-id :feedback-id:from:from:in-reply-to:in-reply-to:message-id :mime-version:references:reply-to:sender:subject:subject:to:to :x-me-proxy:x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s= fm3; t=1673533900; x=1673620300; bh=XcokMuesywxRllOXpayJil3m4/0G hcocSOMeW29gsw4=; b=Kp+q7KmpXhT06eQ8k8uKv5pp/8jC2FUMvhwGGSnkwWq2 haMAlzUGzfmB0GqB9JbbIylV/rYm8YdrT518/XZbw+3+GSDTa97JW1RSmAdzmtg7 jiVyBufj11z45pejxjWHCqMuLm3uCYubbj5msWSjulwMaJH+Ag9qf6GwC8jMywh+ e8ZNZzbE5tpEp/BJlRKODYkQQFlqhk1+4E7WL1XbiAL7eZk6ay9F4rjshAv3YLsx RCFLhvU3DZ7EmT+Ss1xXmQH9QpIpE1I4l/egJr2YKnKqyrIzynYEgNEfdyTJLpX7 +HUAppD9ASzm11qIQ6yag14Z2ujU8TSsoqiQ7s5KdQ== X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvhedrleeigdeihecutefuodetggdotefrodftvf curfhrohhfihhlvgemucfhrghsthforghilhdpqfgfvfdpuffrtefokffrpgfnqfghnecu uegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenuc fjughrpefofgggkfgjfhffhffvvefutgesthdtredtreertdenucfhrhhomhepfdetrhhn ugcuuegvrhhgmhgrnhhnfdcuoegrrhhnugesrghrnhgusgdruggvqeenucggtffrrghtth gvrhhnpeffheeugeetiefhgeethfejgfdtuefggeejleehjeeutefhfeeggefhkedtkeet ffenucevlhhushhtvghrufhiiigvpedunecurfgrrhgrmhepmhgrihhlfhhrohhmpegrrh hnugesrghrnhgusgdruggv X-ME-Proxy: Feedback-ID: i56a14606:Fastmail Received: by mailuser.nyi.internal (Postfix, from userid 501) id DA596B60089; Thu, 12 Jan 2023 09:31:39 -0500 (EST) X-Mailer: MessagingEngine.com Webmail Interface User-Agent: Cyrus-JMAP/3.7.0-alpha0-1185-g841157300a-fm-20221208.002-g84115730 Mime-Version: 1.0 Message-Id: <179739a0-5d75-412b-964b-16d5cb6d306d@app.fastmail.com> In-Reply-To: <20230112140524.GK730856@darkstar.musicnaut.iki.fi> References: <20230112083746.9551-1-lukas.bulwahn@gmail.com> <20230112083746.9551-4-lukas.bulwahn@gmail.com> <3f2663ff-ff3f-4632-853a-ba4d38df9701@app.fastmail.com> <20230112140524.GK730856@darkstar.musicnaut.iki.fi> Date: Thu, 12 Jan 2023 15:31:20 +0100 From: "Arnd Bergmann" To: "Aaro Koskinen" Cc: "Tony Lindgren" , "Lukas Bulwahn" , "Janusz Krzysztofik" , "Krzysztof Kozlowski" , linux-arm-kernel@lists.infradead.org, Linux-OMAP , linux-usb@vger.kernel.org, linux-samsung-soc@vger.kernel.org, kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 3/4] usb: remove OMAP USB Device Controller and OHCI support for OMAP1/2 chips Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org On Thu, Jan 12, 2023, at 15:05, Aaro Koskinen wrote: > On Thu, Jan 12, 2023 at 11:19:53AM +0100, Arnd Bergmann wrote: >> On Thu, Jan 12, 2023, at 10:53, Tony Lindgren wrote: >> >> So if we want to kill off the old DMA stuff there is actually >> a choice between either making omap_udc PIO-only or converting >> it to use the standard dmaengine interface. > > I use this driver on Palm TE and 770, and without it those boards would > be useless for my use cases. Also DMA doubles the throughput, probably > also power usage is smaller. Ok, if the performance is important, converting to dmaengine is probably best. Do you know if this is just a straightforward replacement of the function calls, or are there technical reasons why it's not using the dmaengine interface yet? Arnd