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[2620:137:e000::1:20]) by mx.google.com with ESMTP id s13-20020a056a00194d00b0068225e629aesi9441698pfk.0.2023.07.03.03.12.09; Mon, 03 Jul 2023 03:12:23 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=Phu15QnH; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231367AbjGCJ4U (ORCPT + 99 others); Mon, 3 Jul 2023 05:56:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52868 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231624AbjGCJya (ORCPT ); Mon, 3 Jul 2023 05:54:30 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 89D911BD0; Mon, 3 Jul 2023 02:50:48 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id DE6A460EA2; Mon, 3 Jul 2023 09:50:31 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id BF4A4C433C7; Mon, 3 Jul 2023 09:50:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1688377831; bh=LyukCnfIshSTbAwDJYNp6dcmjM1EfDP7RZS9ZHZjba4=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=Phu15QnH/sD22ugNy9M24vhr8GopWe4IIkSHl900X+cefSZa7cs5exWNiZbmSshgj 98Pq8zd2VvKaRxfPXHzXW0VDh54u1tc8N1Qr6ZckDAAdaRUdDDkTPtbn2+8FR1V9jN CpTiTgw/8axiXSeouIvV52Okhehg+em9wZmgXfZA73QKKLVtU117fwK6w4OK/EZ6Pj Ghw7NBpI9Xf+EzR7Wf+If0mtfsFhKcwkAUsTaDylKV1cjrMwB4HSC3PFQ+g4YVKCeO mZPR9sdLkTEg3zHtBk4ie1NA00jbi1DjBnhFzOyaxwrgnrBlB6q/ztLQgkPrLs39df Ldmb+TDo8Bh6w== Date: Mon, 3 Jul 2023 11:50:26 +0200 From: Wolfram Sang To: Sean Nyekjaer Cc: Pierre-Yves MORDRET , Alain Volmat , Maxime Coquelin , Alexandre Torgue , linux-i2c@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] i2c: stm32f7: Add atomic_xfer method to driver Message-ID: Mail-Followup-To: Wolfram Sang , Sean Nyekjaer , Pierre-Yves MORDRET , Alain Volmat , Maxime Coquelin , Alexandre Torgue , linux-i2c@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <20230509132159.4160984-1-sean@geanix.com> <9BEDFE6D-AE5E-46F1-A1BF-A19C6F5130F6@geanix.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="WPJgYBpM8zD5lQRQ" Content-Disposition: inline In-Reply-To: <9BEDFE6D-AE5E-46F1-A1BF-A19C6F5130F6@geanix.com> X-Spam-Status: No, score=-7.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_HI, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --WPJgYBpM8zD5lQRQ Content-Type: text/plain; charset=us-ascii Content-Disposition: inline > > Will DMA actually run in atomic mode? > Atomic is mainly(only) used for writing a single register in the PMIC > for the stpmic. And this most probably during shutdown... > Guess that will not trigger any DMA use. ... so I'd be very surprised if DMA is operational that late. I think we can rule that out independent of I2C messages to be trasnferred. --WPJgYBpM8zD5lQRQ Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEOZGx6rniZ1Gk92RdFA3kzBSgKbYFAmSimeIACgkQFA3kzBSg KbaU9g//Y1yfLkUK08Go/WdUa65GRV80RBI3gwDyPqLJYNsFbsmajpNqt/4XihqZ RTLxT+tWXSUw4DnFtovhuaucFZcEdtirZLplsCrioc0cNDP5RgYibMuOxsuOig2T M/BJK3b4iqIZJjiT+Lcs7RyPmvRetYTpyu8w17YPt5pPVeXIbDlcC1AStvCK0ghj 0ulGyX3VjRIgo++Dvcw2/08G5WL6MEB6sm9bvveaT1AX6eDBhfgPPB3l/d/+lBki Dd+8le1SnuEVfCN0TxLIZE9m9ZZLYTSH1BcBSCJT6SYPBoM7q26OVdAAAoP4uQ9S M6W3G6zEbHuZ0rTPRt70d2hBqAN40qmPmGZucvxIGoOxMS2rIJ6HRVvbgc3nrK4+ CkQ5PqYb2iIRaEIHposc6ggSgyC15w1pt7lczXZTCakTlgOCRehPMBnipec1n85C IgzRW2Si1yHZMdt5Oe8zvsvfrLsa/vx3xBzHvPh5Ai7IoCEBIpb14B11lcRDSmVT pWdFwgYvCy1t6sltEo1k0WaVVKZpmP/AYWGzQzo5QLyg2q1XnTCQ09pJNlkguPsa lJWc89HAKgOrmnm/r+eHbZQUo3N9KKkRv4FbhMOvUOQK0Vij2R5UX3PLpM6NVPms zV9LzkqESaPfI7W3j311Gv5hhvyUkGKnh5UeVPgv2OMC6J0Sy/Q= =qlPi -----END PGP SIGNATURE----- --WPJgYBpM8zD5lQRQ--