From mboxrd@z Thu Jan 1 00:00:00 1970 From: Adrian Hunter Subject: Re: [PATCH 5/8] omap_hsmmc: RX51: set padconfs to pull down when powering off eMMC Date: Fri, 15 Jan 2010 15:11:06 +0200 Message-ID: <4B50696A.6050904@nokia.com> References: <20100113114010.7615.84920.sendpatchset@ahunter-work.research.nokia.com> <20100113114048.7615.51097.sendpatchset@ahunter-work.research.nokia.com> <20100113203745.GK2986@atomide.com> <20100113203958.GL2986@atomide.com> <20100113210042.GM2986@atomide.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from smtp.nokia.com ([192.100.105.134]:58652 "EHLO mgw-mx09.nokia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755263Ab0AONLT (ORCPT ); Fri, 15 Jan 2010 08:11:19 -0500 In-Reply-To: <20100113210042.GM2986@atomide.com> Sender: linux-omap-owner@vger.kernel.org List-Id: linux-omap@vger.kernel.org To: Tony Lindgren Cc: linux-mmc Mailing List , Andrew Morton , linux-omap Mailing List , Madhusudhan Chikkature Tony Lindgren wrote: > * Tony Lindgren [100113 12:38]: >> * Tony Lindgren [100113 12:36]: >>> You might want to check what happens in omap off-idle mode in these cases >>> and see if enabling OMAP_PIN_OFF_INPUT_PULLDOWN makes any difference in >>> power consumption in off state. That probably does not matter unless the >>> floating lines cause the eMMC to do something on it's own :) >> Or OMAP_PIN_OFF_OUTPUT_LOW actually. > > One more time.. Most likely OMAP_PIN_OFF_INPUT_PULLDOWN is safer > in general as the OMAP_PIN_OFF_OUTPUT_LOW does not work for all > pins. According to the TRM, OMAP_PIN_OFF_OUTPUT_LOW only works > for pins where at least one of the mux modes supports output > mode. While eMMC is on, it is better if the lines are pulled up, irrespective of whether OMAP is OFF, just to keep to the MMC specification.