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 X-Spam-Level: X-Spam-Status: No, score=-4.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 57749C433DB for ; Thu, 28 Jan 2021 09:22:02 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id D96A364DBD for ; Thu, 28 Jan 2021 09:22:01 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D96A364DBD Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=the-dreams.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Type:Cc: List-Subscribe:List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id: In-Reply-To:MIME-Version:References:Message-ID:Subject: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=O1iKNXVTerqMljpxf7/WfCRm1suks7pTGHwWercexPI=; b=oo3fszKcR2Tw450VOuXS+VI81 qyd67eHJTU4YP/cRt0IgfxTXhaMSx5m0hkcNFDZgFLnYmpBqb7UXj6bo0VL6w4tXO7VpaW1nhzOH9 QKGaRtSuQvVdRoY2HPiqXx9hY1tjlsWv+FMSZeGGV76VDuKm+Ge3eKpahoWT33lv/8VVNOgWUeTry cPfCPiSpF3w8MytDTURO0JvxTfJo4LSXAE1LqSaZnOMyclQGc+x9q3VM2S8XAq5wMD5E/OkZySKa2 tIF1uegMR0ebuKm+jUcHn21Gn70vcG+8piPTBwu1/7mF6FqeLkgEG6KgUGJyxnXXelKEqSUnue/pV C2s8s5gIg==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1l53U0-0000gp-6X; Thu, 28 Jan 2021 09:20:56 +0000 Received: from sauhun.de ([88.99.104.3] helo=pokefinder.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1l53Tw-0000fD-O2 for linux-arm-kernel@lists.infradead.org; Thu, 28 Jan 2021 09:20:54 +0000 Received: from localhost (p54b33782.dip0.t-ipconnect.de [84.179.55.130]) by pokefinder.org (Postfix) with ESMTPSA id 354292C04D8; Thu, 28 Jan 2021 10:20:49 +0100 (CET) Date: Thu, 28 Jan 2021 10:20:48 +0100 From: Wolfram Sang To: Kevin Herbert Subject: Re: [PATCH] i2c-imx.c: Synthesize end of transaction events without idle interrupts Message-ID: <20210128092048.GK963@ninjato> References: <20201222194850.2274527-1-kph@platinasystems.com> <20210108080521.dzm2gczd3d2ygb5y@pengutronix.de> MIME-Version: 1.0 In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210128_042052_891644_D0AD1F9F X-CRM114-Status: GOOD ( 10.76 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Aisheng Dong , Biwen Li , festevam@gmail.com, s.hauer@pengutronix.de, linux-kernel@vger.kernel.org, Biwen Li , linux@rempel-privat.de, Oleksij Rempel , Clark Wang , linux-i2c@vger.kernel.org, kernel@pengutronix.de, Jiafei Pan , Leo Li , shawnguo@kernel.org, Xiaobo Xie , linux-arm-kernel@lists.infradead.org Content-Type: multipart/mixed; boundary="===============5378625058180864686==" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org --===============5378625058180864686== Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="Xsn3knLL3qrmRbVI" Content-Disposition: inline --Xsn3knLL3qrmRbVI Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Jan 14, 2021 at 05:27:11PM -0800, Kevin Herbert wrote: > The loop sends either one or two events to the slave driver. If the > state is I2C_SLAVE_READ_REQUESTED, we synthesize the > I2C_SLAVE_READ_PROCESSED event, and then our state becomes > I2C_SLAVE_READ_PROCESSED. In all other states, we transition to > I2C_SLAVE_STOP and exit the loop. >=20 > It is not a busy loop at all. It is calling the callback handler (that > already expects to be in IRQ context) one or two times, and then it > exits the loop. Oleksij, does this answer your question? --Xsn3knLL3qrmRbVI Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEOZGx6rniZ1Gk92RdFA3kzBSgKbYFAmASgfAACgkQFA3kzBSg KbapWw/9EQprHfUvjk3btzBRIJmgaHJjdoVMhcAEEF6kZpyXAwMEHZGeczR706yH mTy4tF6KMirsZIfGk8GMI22xirN4ztEH+eHbr+AdbKhgj4Fu4GmJiYu2mm29Ds9b 5pYigwi/rFNl+BwNZgHp92/G0EC975imGZ2NHM6qyROi2al0AkD99K8GY//XycwB 1m8pvZPVF6sBend7u952/OOnHLkxMf9gu7T1SyTplTcDYT+YWcMrTy4dU2gDo50Q o9IO2RRSf6rJdzjCdxFK0yR9coGg89SEvnmzb+y8ZrLCWRTj2Lyt99zZIzIFnE4E Tb9on2LtVVXVVtGr3ZefTzow5g0RdkfKa/LN67Z3MiFJGdeEe9mx8lDpzPkqHRxD n4N6cp+8GRJsLQ+GwkmCk6zSVBHksSF3Spke1x4qhlvvbbneePdjxD665ImeoZdA hOdH2ePT7WU0QDcfmzGl5CX3GNHftoDi6ew0lbqeCE/6zXoLwa/bRnOBDnPgc2+k fEbO1Dt4MJMClhaTd06tF9rBSbma/bfjt9MsuEuUeASXKpfVsMZzrhMaEHmpeE16 AZknjCujTeHC59tzDi6+nQJYzdCP63O7pOW3+8Zd4K+rPKIubdIO61AM31Anoyit SeZUR4jtMlevXG1Ypo4/FB9Tx99RZ1qYea2ddadFeTuL7+XZXnc= =eCtP -----END PGP SIGNATURE----- --Xsn3knLL3qrmRbVI-- --===============5378625058180864686== 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 --===============5378625058180864686==--