Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754816AbaGULFc (ORCPT ); Mon, 21 Jul 2014 07:05:32 -0400 Received: from mx07-00178001.pphosted.com ([62.209.51.94]:57586 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754350AbaGULF1 (ORCPT ); Mon, 21 Jul 2014 07:05:27 -0400 Message-ID: <53CCF3EC.6030904@st.com> Date: Mon, 21 Jul 2014 13:05:16 +0200 From: Maxime Coquelin User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 MIME-Version: 1.0 To: Wolfram Sang Cc: , , Srinivas Kandagatla , Patrice Chotard , Subject: Re: [PATCH] drivers: i2c: i2c-st: Update i2c timings References: <1400254330-2547-1-git-send-email-maxime.coquelin@st.com> <20140602163103.GJ2654@katana> <538D7A1C.5040409@st.com> <20140603075922.GB2653@katana> In-Reply-To: <20140603075922.GB2653@katana> Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.201.23.80] X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.12.52,1.0.14,0.0.0000 definitions=2014-07-20_03:2014-07-18,2014-07-20,1970-01-01 signatures=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Wolfram, On 06/03/2014 09:59 AM, Wolfram Sang wrote: > >>> Can you give names here? Would be interesting to know since a few >>> drivers implement the minimum timings. >> >> I don't have the name actually. >> The request to implement this change came from hw guys. > > Can you ask? It feels better to have changes based on facts. Sorry for the late reply, but it took time to get the answer. Apparently the HDMI link of the Toshiba 19AV600U TV is affected by this. I have no references of other devices (if any). > >>>> This patch adds a 10% margin on all the timings. >>> >>> Is there a safety margin or do the devices start to work exactly at 10%? >> >> 10% is a safety margin, I don't know what is the limit. > > Which also came from the HW guys? Please ask for details why 10%, too. This is a safety margin. Note that the I2C specification only defines minimal timings. Is it fine for you? Can I re-send a v2, which: - Indicate the Toshiba TV is one of the affected devices in the commit message - Indicate the 10% margin is a safety one in the commit message - Add a comment above the table indicating these are standard timings + 10% margin. Regards, Maxime > > Thanks, > > Wolfram > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/