From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wolfram Sang Subject: Re: [PATCH] i2c: imx: implement master_xfer_atomic callback Date: Sat, 22 Feb 2020 12:55:32 +0100 Message-ID: <20200222115532.GE1716@kunai> References: <20200120093650.12911-1-m.felsch@pengutronix.de> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="FN+gV9K+162wdwwF" Return-path: Received: from sauhun.de ([88.99.104.3]:53266 "EHLO pokefinder.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726839AbgBVLze (ORCPT ); Sat, 22 Feb 2020 06:55:34 -0500 Content-Disposition: inline In-Reply-To: <20200120093650.12911-1-m.felsch@pengutronix.de> Sender: linux-i2c-owner@vger.kernel.org List-Id: linux-i2c@vger.kernel.org To: Marco Felsch Cc: linux@rempel-privat.de, kernel@pengutronix.de, shawnguo@kernel.org, s.hauer@pengutronix.de, festevam@gmail.com, linux-imx@nxp.com, stefan@agner.ch, linux-i2c@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Stefan Lengfeld , Oleksij Rempel --FN+gV9K+162wdwwF Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Jan 20, 2020 at 10:36:50AM +0100, Marco Felsch wrote: > From: Stefan Lengfeld >=20 > Rework the read and write code paths in the driver to support operation > in atomic contexts. To achieve this, the driver must not rely on IRQs > and not call schedule(), e.g. via a sleep routine, in these cases. >=20 > With this patch the driver supports normal operation, DMA transfers and > now the polling mode or also called sleep-free or IRQ-less operation. It > makes the code not simpler or easier to read, but atomic I2C transfers > are needed on some hardware configurations, e.g. to trigger reboots on > an external PMIC chip. >=20 > Signed-off-by: Stefan Lengfeld > [m.felsch@pengutronix.de: integrate https://patchwork.ozlabs.org/patch/10= 85943/ review feedback] > [m.felsch@pengutronix.de: adapt commit message] > Signed-off-by: Marco Felsch > Acked-by: Oleksij Rempel Applied to for-next, thanks! --FN+gV9K+162wdwwF Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEOZGx6rniZ1Gk92RdFA3kzBSgKbYFAl5RFrQACgkQFA3kzBSg KbYPkw/9Hi3Vx9RCtmCXXbRYJxXGiQbNjKeAxC3gOUFsMyMWGOOaM8QJTA3MgnV4 R8FBuv9oZ/aKU0kyIiphAEcSAYM4z7Il/vT/5T7Ko4fnhm9r2iuiKMC9jlgBrRrs R6lIS/GnZMLomeTR1kPoVLLpq9Gq5Isj345ElhfdM5sEpb0ap7Elt6a1/QYoG8OQ 8xA9VyD2V5sfzbBbukESbScyfGmOpQzSP3SHZSuib5FBUAlrQNhWMhVLLR7Si+36 svVMjx1FbHLA3JX8gGhmA+XC+b/Yd3uVoRje1I3RtFEKiwJANKjKgyD6PR2wPlZS jVCJ+3SBmv8Uclubnt7aDgXbewZpYnxzkTWtN3oDP2/UooCWS63TaIlCpbsJb/iu HzDGIrpl6YGa1hcXCvkTEFZ9v/z81a3mzgDE0ZXyfr1Rb296Nw10TBXp1xA8ZKXV kNvd/3JmcEpspaWrvtfmXSpJOecB02MgvLGeX+l4c0juHlZViUa7YDvbBb6Y9bIP sgLPucEEPQ/jyfhXwrAIgoRJDjuVMxfRCTB8xtAJ4dgmwcqphCIJfSu1gdPN2P+j biqjULPVFHoCVNDi4wev4PcKH3+ynG3ElTfh7syU4XOO4xT/3SbifUQM+OgZkP6b 14W1oKXeVPg7B6/64+8wxPpJ9LujjWtGSilsoqxglSMDEVXsRys= =u/DY -----END PGP SIGNATURE----- --FN+gV9K+162wdwwF--