From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marek Vasut Subject: Re: [PATCH] ARM: mxs: Slow down the I2C clock speed Date: Tue, 2 Apr 2013 21:11:05 +0200 Message-ID: <201304022111.05858.marex@denx.de> References: <1364858969-17745-1-git-send-email-marex@denx.de> <20130402112850.GD24039@S2101-09.ap.freescale.net> Mime-Version: 1.0 Content-Type: Text/Plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20130402112850.GD24039-rvtDTF3kK1ictlrPMvKcciBecyulp+rMXqFh9Ls21Oc@public.gmane.org> Sender: linux-i2c-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Shawn Guo Cc: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Fabio Estevam List-Id: linux-i2c@vger.kernel.org Dear Shawn Guo, > Marek, > > On Tue, Apr 02, 2013 at 01:29:29AM +0200, Marek Vasut wrote: > > Slow down the I2C clock speed on M28 and SPS1 as it turns out the > > I2C block in i.MX28 can not operate stable enough with the bus > > running at 400kHz. Note that the driver used by Freescale runs > > the bus at 250kHz when 400kHz speed is selected, but the mainline > > Linux kernel runs the bus at actual 400kHz and that's where it is > > occasionally unstable. Play safe and run the bus at 100kHz. > > > > Signed-off-by: Marek Vasut > > You consider it a fix for 3.9 or just material for 3.10? Fix for 3.9 please. Best regards, Marek Vasut