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korsgaard.com; dkim=none (message not signed) header.d=none;korsgaard.com; dmarc=bestguesspass action=none header.from=cern.ch; Received-SPF: Pass (protection.outlook.com: domain of cern.ch designates 188.184.36.46 as permitted sender) receiver=protection.outlook.com; client-ip=188.184.36.46; helo=cernmxgwlb4.cern.ch; Received: from cernmxgwlb4.cern.ch (188.184.36.46) by HE1EUR02FT039.mail.protection.outlook.com (10.152.11.222) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.20.1294.14 via Frontend Transport; Mon, 29 Oct 2018 13:11:38 +0000 Received: from cernfe04.cern.ch (188.184.36.41) by cernmxgwlb4.cern.ch (188.184.36.46) with Microsoft SMTP Server (TLS) id 14.3.408.0; Mon, 29 Oct 2018 14:11:15 +0100 Received: from pcbe13614.localnet (2001:1458:202:121::100:40) by smtp.cern.ch (2001:1458:201:66::100:14) with Microsoft SMTP Server (TLS) id 14.3.408.0; Mon, 29 Oct 2018 14:11:14 +0100 From: Federico Vaga To: Peter Korsgaard , linux-i2c Reply-To: CC: Subject: Re: [PATCH 3/3] i2c:ocores: add polling interface Date: Mon, 29 Oct 2018 14:11:14 +0100 Message-ID: <5709014.JH4KZFlPMP@pcbe13614> In-Reply-To: <87muqwzyya.fsf@dell.be.48ers.dk> References: <20180625161303.7991-1-federico.vaga@cern.ch> <5352289.A0jT2G1FDH@pcbe13614> <87muqwzyya.fsf@dell.be.48ers.dk> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; 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> > > > But. > > Since it is better to make this patch ready for xfer_irqless, then I will > > definitively go for udelay(). The reason is that, xfer_irqless may run in > > atomic context where we can't sleep at all. > > Great! BTW I noticed that your sleep_min calculation looked odd: > > int sleep_min = (8/i2c->bus_clock_khz) * 1000; /* us for 8bits > > bus_clock_khz almost certainly will be bigger than 8 (E.G. likely > 100KHz), so the above set sleep_min to 0. Please move the * 1000 before > the division. True, oops