From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nishanth Menon Subject: Re: [PATCH 5/8] omap_hsmmc: RX51: set padconfs to pull down when powering off eMMC Date: Wed, 13 Jan 2010 17:30:45 -0600 Message-ID: <4B4E57A5.4050400@ti.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="ISO-8859-1"; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from devils.ext.ti.com ([198.47.26.153]:33395 "EHLO devils.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754527Ab0AMXbB (ORCPT ); Wed, 13 Jan 2010 18:31:01 -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: Adrian Hunter , linux-mmc Mailing List , Andrew Morton , linux-omap Mailing List , "Chikkature Rajashekar, Madhusudhan" Tony Lindgren had written, on 01/13/2010 03:00 PM, the following: > * 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. is'nt vaux/vmmc/whatever voltage to eMMC shutoff for the device on the board in off mode? I wonder why the behavior is seen. The only thing that I am worried is that the board potentially will draw more current as the lines are driven low. -- Regards, Nishanth Menon