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 CEDDBC433F5 for ; Tue, 15 Mar 2022 07:44:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345595AbiCOHp2 (ORCPT ); Tue, 15 Mar 2022 03:45:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39564 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244096AbiCOHp0 (ORCPT ); Tue, 15 Mar 2022 03:45:26 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3E2462BE0; Tue, 15 Mar 2022 00:44:15 -0700 (PDT) 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 E66C0B81151; 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 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="bl0XJwSOY8CQGyd+" Content-Disposition: inline In-Reply-To: <20220315055935.GB14588@pengutronix.de> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --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+--