Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755706AbaDXJMp (ORCPT ); Thu, 24 Apr 2014 05:12:45 -0400 Received: from arroyo.ext.ti.com ([192.94.94.40]:55403 "EHLO arroyo.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755313AbaDXJMk (ORCPT ); Thu, 24 Apr 2014 05:12:40 -0400 Message-ID: <5358D584.6080206@ti.com> Date: Thu, 24 Apr 2014 12:12:36 +0300 From: Peter Ujfalusi User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 MIME-Version: 1.0 To: CC: , , , Subject: Re: [RESEND 0/3] mfd: twl6040: Updates for i2s speed and fix for chip deadlock References: <1396359901-32656-1-git-send-email-peter.ujfalusi@ti.com> In-Reply-To: <1396359901-32656-1-git-send-email-peter.ujfalusi@ti.com> Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Lee, On 04/01/2014 04:44 PM, Peter Ujfalusi wrote: > Hi, > > While looking into a report by Florian Vaussard [1] I have noticed couple of most > likely unrelated issues: > - all boards using twl6040 configures the i2c bus to 400KHz while twl6040 is set > to 100KHz as default. > - if I set the audpwron GPIO high [2] in the bootloader the i2c communication towards > twl6040 will be broken > - got confirmation from HW design teams that twl6040 can work on a bus with > 400KHz even if after hard reset but it is optimal to swithc to 400KHz mode as > soon as possible. > > The solution or these are: > set the twl6040 to i2c fast mode with regmap patch > Clear the INTID register right after we request the audpwron GPIO and set it to > low. Do you want me to resend this series again? Thanks, P?ter > > Generated on top of: > git://git.linaro.org/people/lee.jones/mfd.git for-mfd-next > > Tested on PandaBoard, PandaBoardES, OMAP4-blaze (SDP) > > [1] http://www.spinics.net/lists/arm-kernel/msg310725.html > [2] Command in u-boot to enable the audpwron on PandaBoards: gpio set 127 > > Regards, > Peter > --- > Peter Ujfalusi (3): > mfd: twl6040: Select i2c fast mode as default with regmap patch > mfd: twl6040: Move register patching earlier in probe > mfd: twl6040: Clear the interrupt ID register before requesting IRQ > > drivers/mfd/twl6040.c | 19 +++++++++++++------ > include/linux/mfd/twl6040.h | 1 + > 2 files changed, 14 insertions(+), 6 deletions(-) > -- 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/