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: Thu, 14 Jan 2010 09:57:22 +0200 Message-ID: <4B4ECE62.5030408@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> <4B4E57A5.4050400@ti.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <4B4E57A5.4050400@ti.com> Sender: linux-mmc-owner@vger.kernel.org To: Nishanth Menon Cc: Tony Lindgren , linux-mmc Mailing List , Andrew Morton , linux-omap Mailing List , "Chikkature Rajashekar, Madhusudhan" List-Id: linux-omap@vger.kernel.org Nishanth Menon wrote: > 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. OMAP is not OFF just the eMMC. Current is sucked out of the data lines through the eMMC to the regulator which is off.