From mboxrd@z Thu Jan 1 00:00:00 1970 From: shawn.guo@linaro.org (Shawn Guo) Date: Mon, 1 Jul 2013 23:33:29 +0800 Subject: [alsa-devel] [PATCH 1/4] ASoC: sgtl5000: give it a ramping time before writting In-Reply-To: References: <1372666571-17276-1-git-send-email-shawn.guo@linaro.org> <1372666571-17276-2-git-send-email-shawn.guo@linaro.org> <20130701100710.GB27646@sirena.org.uk> <201307011254.18952.marex@denx.de> <20130701142610.GR13206@S2101-09.ap.freescale.net> <20130701143415.GA14172@S2101-09.ap.freescale.net> Message-ID: <20130701153327.GX13206@S2101-09.ap.freescale.net> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Mon, Jul 01, 2013 at 12:11:58PM -0300, Fabio Estevam wrote: > On Mon, Jul 1, 2013 at 11:34 AM, Shawn Guo wrote: > > > And also why we do not see the impact of i2c issue on sgtl5000 before > > the offending commit af8ee11 (ASoC: sgtl5000: Fix driver probe after > > reset)? > > Probably because the mxs i2c was working before this commit. Do you have a commit id at which mxs i2c is known good? I would like to find out it's a mxs i2c issue or sgtl5000 problem. > > Commit af8ee11 does fix the reset probe on mx51/mx53/mx6. > > It's only on mx28 that we have this issue. > > Also, please see this patch from Alexandre Belloni: > https://lkml.org/lkml/2013/6/24/430 > > He can only connect the ADC chip if he uses I2C bitbang mode on mx28. Does I2C bitbang mode help fix the sgtl5000 issue here? Shawn