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[23.128.96.18]) by mx.google.com with ESMTP id h34si7114157pgl.179.2021.05.07.08.09.52; Fri, 07 May 2021 08:10:05 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b="N/lqcnc7"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235021AbhEGLro (ORCPT + 99 others); Fri, 7 May 2021 07:47:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48698 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234729AbhEGLrn (ORCPT ); Fri, 7 May 2021 07:47:43 -0400 Received: from mail-pg1-x529.google.com (mail-pg1-x529.google.com [IPv6:2607:f8b0:4864:20::529]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 235C6C061574; Fri, 7 May 2021 04:46:43 -0700 (PDT) Received: by mail-pg1-x529.google.com with SMTP id i5so2219804pgm.0; Fri, 07 May 2021 04:46:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=uR1cJZI3x3ph+ewlJwOwS07YkruOTk4an/PdVhtMkr8=; b=N/lqcnc7KQMPu+KrJo3SjocMaNEwCApyjgxnyQLW873BudWttiMLSpO4CUBq681LQL XBfOq5qyPexcbixQ6C3LY8k/dekbWv61aTSda52k3Jss+rBrxKEPxGKiiu0oci8iS+I3 GfZ9D/GFQP157QsHBB7aYo1uT6L+ieQ09Iz5YldWpSOK4U3kRz39eqAaq56woDaBzEwW b22Lka5d7x5/A4PXygCls6CxhDGUo22iUBxMdctxDw2rszPIUw2bHJx56F4H7roRFrBS ULEr5IlntuCT5oNvY3yS4WlONi1CkH2oZO/boJi3YE+AvhgS4cITmZgJdFmTij450yCJ LjuA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=uR1cJZI3x3ph+ewlJwOwS07YkruOTk4an/PdVhtMkr8=; b=ktw3PM9Nm31F2d8lVtVS3HbRHNH3y2wKlCymIYGInX6rWIxh54SiijnsCoCo7e1DJH lV9jMYy6a7X8qMQkLNePzOHuYfVVvDfdiRiCpMsszZypXccAb8BZlJcanmiKeeCHH747 snHwMAsb28Sa0hxlSzQMdeHqDfyAkIb6cPRvfdytcDTB6GtMxU4En26piPqnRCfXlCef TJSICQ2doKa3F6SkuIfVuAgOMhmqwzZgyUzu29MxBFj9uDeLRkiK/5R5FuupVAP0Z6nX nVKIr+MkbodJn65yo9WE4pmIiogBjtc56WfTwYZAdOvKbt4DzNsS7auRaFY5UPpRFDQQ hUqA== X-Gm-Message-State: AOAM532abKaN68Vr2t50EYAmu91dQdU+AP00K23fWK2LzXkWeOaJdNWf bKYPJK0ULtp+tiws0Yt9DJaDHbdo+jPhz7KmTKolU46rUrdAOA== X-Received: by 2002:a63:cd11:: with SMTP id i17mr9429849pgg.74.1620388002532; Fri, 07 May 2021 04:46:42 -0700 (PDT) MIME-Version: 1.0 References: <20210507004047.4454-1-chris.packham@alliedtelesis.co.nz> <20210507004047.4454-4-chris.packham@alliedtelesis.co.nz> In-Reply-To: <20210507004047.4454-4-chris.packham@alliedtelesis.co.nz> From: Andy Shevchenko Date: Fri, 7 May 2021 14:46:26 +0300 Message-ID: Subject: Re: [PATCH v2 3/3] i2c: mpc: implement erratum A-004447 workaround To: Chris Packham Cc: Wolfram Sang , Andy Shevchenko , Rob Herring , Michael Ellerman , linux-i2c , devicetree , "open list:LINUX FOR POWERPC PA SEMI PWRFICIENT" , Linux Kernel Mailing List Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, May 7, 2021 at 3:40 AM Chris Packham wrote: > > The P2040/P2041 has an erratum where the normal i2c recovery mechanism > does not work. Implement the alternative recovery mechanism documented > in the P2040 Chip Errata Rev Q. Thanks. > +static int i2c_mpc_wait_sr(struct mpc_i2c *i2c, int mask) > +{ > + int ret; > + u8 val; > + > + ret = readb_poll_timeout(i2c->base + MPC_I2C_SR, val, > + val & mask, 0, 100); > + > + return ret; > +} So, now you may shrink it even further, i.e. void __iomem *sr = i2c->base + MPC_I2C_SR; u8 val; return readb_poll_timeout(sr, val, val & mask, 0, 100); -- With Best Regards, Andy Shevchenko