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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id D8AD1C433EF for ; Tue, 15 Mar 2022 07:45:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Content-Type: List-Subscribe:List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id: In-Reply-To:MIME-Version:References:Message-ID:Subject:Cc:To:From:Date: Reply-To:Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date :Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=LBFFDiHrH3OiObkT0GA50j119P5dMfKHxmZSqozaG6U=; b=okBXXvT3C36HHU408s8oWzGyL+ 1Sdqt//afteVkcnM+lmZVMC/FddA9u2M6fC5HFQEDdqzriyfIu0cCs4Oop//MlTPTI+zwm5rL1vuQ B49bMgACAKv+AKf3mYywYVmIqm7ASYW4qrQBFttYaPqHziDshLakd40EDNdqAXpBi54C1d8/8f9Rx MGllfFrg/ieFmuw1awRkPgAiLYdsTE94XUBsJP6qWMHDiXMR+vxjoU2MZ5qyU5Sp8QI5ZlVGYPTbp S3HpPNvcPxhGr9D5rk0sXSruGGOCLtlKMFRpA1+ZnUn3r1d++WRf0tNIUU7Z2DGjR7hIujlJT5Pwg NmVEM0Pw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nU1qs-0089vP-Mc; Tue, 15 Mar 2022 07:44:18 +0000 Received: from ams.source.kernel.org ([145.40.68.75]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nU1qp-0089u7-P1 for linux-arm-kernel@lists.infradead.org; Tue, 15 Mar 2022 07:44:17 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id A0004B81115; Tue, 15 Mar 2022 07:44:13 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A252DC340E8; Tue, 15 Mar 2022 07:44:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1647330252; bh=0bFweEuF8OfqRwP501goExaiCdTzj541iER295VFBhM=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=PYlZj+wunz3LRXUjmyVECWjA1ANviY1Xn/xCvVuYXn4/2VWNriNwD7s4lSkX4kRni mD1x3AP4FZOtAvU23yzAWnPm7n7M9mxHarMvVlEQD7A3QUGze22qrm2duVyMgrRRy3 YTAuotQc5T04XYxA0DufScbOa0FtwnNo5toEolT4Y64ycfVlk/MbUtmzbGSnQWnhOF GvrCTYWF8/8TEachYaKKicXR8p54pkxZDDJn1bQcSfNgj6InU5v7IHZsTD3LWV+h4k qekBF0vj5aHGFoZd+ij5pkogNyZcRhJMPRaJLJ9ayB3vSJZ9MGdfM1lD4DXtFAOtML JSoB1Zdbc5e4Q== Date: Tue, 15 Mar 2022 08:44:05 +0100 From: Wolfram Sang To: Oleksij Rempel Cc: Uwe =?utf-8?Q?Kleine-K=C3=B6nig?= , Ian Dannapel , linux@rempel-privat.de, Erik.Schumacher@iris-sensing.com, shawnguo@kernel.org, s.hauer@pengutronix.de, linux-kernel@vger.kernel.org, Michael.Glembotzki@iris-sensing.com, linux-imx@nxp.com, kernel@pengutronix.de, festevam@gmail.com, linux-arm-kernel@lists.infradead.org, linux-i2c@vger.kernel.org Subject: Re: [PATCH] i2c: imx: remove unnecessary delay at startup Message-ID: Mail-Followup-To: Wolfram Sang , Oleksij Rempel , Uwe =?utf-8?Q?Kleine-K=C3=B6nig?= , Ian Dannapel , linux@rempel-privat.de, Erik.Schumacher@iris-sensing.com, shawnguo@kernel.org, s.hauer@pengutronix.de, linux-kernel@vger.kernel.org, Michael.Glembotzki@iris-sensing.com, linux-imx@nxp.com, kernel@pengutronix.de, festevam@gmail.com, linux-arm-kernel@lists.infradead.org, linux-i2c@vger.kernel.org References: <20220314095918.50014-1-iansdannapel@gmail.com> <20220314101337.4x2cu3nvg2vg7ulh@pengutronix.de> <20220315055935.GB14588@pengutronix.de> MIME-Version: 1.0 In-Reply-To: <20220315055935.GB14588@pengutronix.de> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220315_004415_989378_FC5C911D X-CRM114-Status: GOOD ( 12.76 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============2143748349260763251==" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org --===============2143748349260763251== Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="bl0XJwSOY8CQGyd+" Content-Disposition: inline --bl0XJwSOY8CQGyd+ Content-Type: text/plain; charset=us-ascii Content-Disposition: inline > Maybe. I do not see what exact problem is this sleep addressing. How > exact the can get stable? Is it addressing some clock issue or wading > until something happening on the bus? Yeah, it is really hard to see why it is there. And given that the introducing commit is from 2009, we can't really expect an active userbase reporting breakage. So, although it may be a useless delay, I'd like to see an opt-in approach for not using it. --bl0XJwSOY8CQGyd+ Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEOZGx6rniZ1Gk92RdFA3kzBSgKbYFAmIwQ8EACgkQFA3kzBSg Kba3Zg//cGzkgTkzhGMFXByotIKATzkcHcXPdGr9kMfzqtG/DRZTCfhEFiesqPcL lho7yftBOSxqPjebs/FAvmVCkg5TErMD3v2QHs8+QYiiypIm2fUYmbisnutqY1WX SAlN8F2l3R/oD4P/N/K6+Yglxjv7IbCTS33oYf+SLMthFMCsTBmjCW4mgkZTs/gf AUN5yJzuxzfX5SK0KGw1+jTS7nARyMREEijbHkkFXEykgK1ckuMV5sAB9pc7l60q cMAxyuDMSl3ltF5Wbxr0LDfkhy0OCnLtBH3d+GDT97jrkH1UQnP9DiHwMs11h1hC 78b7UbtPtigLJ33EyvVxSi11y40KfAJATXcSqP/BO6o9lhei+6dkiqLxr713S7x3 d3MVhR69g0dupUz0SZ5VbNSHwgBnfpNRxmA2InifY+MTcwJUoUKz9PinHbaDjAMi 2IK1R1tuxEz22KAEdwnjnq7ei1JgB+KdRs/EfQITFBcrZ4E8omvjazgEpm0IWy9h RJpjLfvhroRJ8s/Jhf9pURIHYwCbHRj/+dsWf38EG4ZI9Mn1YSEtQ1L02ku2Ner+ ArKSbyv3BtlnmDfuUx5pLKm+vFA2TkdvGlQ7Z803zoMqQt01yPpF4NojDXY+8Fwo WTT7nrY5/sRSBDCcXuszwmLSn/zRMlHtchkLurRREcLqm8z9EwM= =2iXu -----END PGP SIGNATURE----- --bl0XJwSOY8CQGyd+-- --===============2143748349260763251== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel --===============2143748349260763251==--