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=-5.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=unavailable 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 F33E3C4724C for ; Thu, 30 Apr 2020 14:17:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D2042206D9 for ; Thu, 30 Apr 2020 14:17:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726896AbgD3ORD (ORCPT ); Thu, 30 Apr 2020 10:17:03 -0400 Received: from sauhun.de ([88.99.104.3]:40398 "EHLO pokefinder.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726743AbgD3ORC (ORCPT ); Thu, 30 Apr 2020 10:17:02 -0400 Received: from localhost (p5486CDDB.dip0.t-ipconnect.de [84.134.205.219]) by pokefinder.org (Postfix) with ESMTPSA id 865B62C08FC; Thu, 30 Apr 2020 16:17:01 +0200 (CEST) Date: Thu, 30 Apr 2020 16:17:01 +0200 From: Wolfram Sang To: ryan_chen Cc: Brendan Higgins , Benjamin Herrenschmidt , Joel Stanley , Andrew Jeffery , linux-i2c@vger.kernel.org, openbmc@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org, linux-aspeed@lists.ozlabs.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v0 linux master] i2c/busses: Avoid i2c interrupt status clear race condition. Message-ID: <20200430141701.GC3355@ninjato> References: <20200429033737.2781-1-ryan_chen@aspeedtech.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="1SQmhf2mF2YjsYvc" Content-Disposition: inline In-Reply-To: <20200429033737.2781-1-ryan_chen@aspeedtech.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --1SQmhf2mF2YjsYvc Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Apr 29, 2020 at 11:37:37AM +0800, ryan_chen wrote: > In AST2600 there have a slow peripheral bus between CPU > and i2c controller. > Therefore GIC i2c interrupt status clear have delay timing, > when CPU issue write clear i2c controller interrupt status. > To avoid this issue, the driver need have read after write > clear at i2c ISR. >=20 > Signed-off-by: ryan_chen Applied to for-current with a Fixes tag, thanks! Please, try to add one next time and please also check how the subsystem formats the $subject line. --1SQmhf2mF2YjsYvc Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEOZGx6rniZ1Gk92RdFA3kzBSgKbYFAl6q3d0ACgkQFA3kzBSg KbaoUQ//QVc//2TXd44pz2LgsMx+qUkEgZNrrJKgAGlXr1KGtLR1Km4XWzGzEutz cQCYsZtGWucGPt93oJeSXYx9FWagTYPrR47XbX0U5gCQyVY7XtQc4Wj9LXFOgfi4 c/QQVEAtO38HiNGcWumxxc8Td57nbEuvDfMQltBqsuNXeo4BDLl39xvbzFIWHVDE 9D4Re0pWNf4Y4sYFB4kR8hHdaQkYfki1jE0j99sXskuC6pMcVzSMKUIzrISs4BAe LUCDcrSFokr1W0eqBT6uFvHk4SErXjY0OH+jWxugBXgVliAvSER22FBg2kwqvHC3 fH9CGDi7Ns3RdOoW7d9bTLiHgeaRLBbmTUyuzzKOgXrBJqBnT0AucMfa+X6Is7vC DS4ojD5tVuP3cMQb+sqVxufPIDPVGRXd7Ee2upMtkNNrd9U6W1cun8jPto6hg5Zu G/llTNEsGQaYXrSNXJ6mO3p8BL2EhhvSyaOCItGWKvzGudpNCIR47bMiobK1mZwM F/tkz9xTiXnNipwRMmoQwcon/XoDdVcMs6VoVRIdKk0llGks5kfuZA+zTqc2Kv+h UvuYl+dTFHH9QEbVN/guogoINdM+Fn0+NMaZWcg7D09tUxRFbbRB/eoyD5q8ms7n O/NsT911s4Uw1axbcH/+iF4Ys1dnQlRuDglr/xiqogiibdbkfTY= =f9co -----END PGP SIGNATURE----- --1SQmhf2mF2YjsYvc--