From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Subhash Jadavani" Subject: RE: Question regarding SDR104 bus speed mode Date: Mon, 18 Jul 2011 10:51:52 +0530 Message-ID: <000001cc450a$9c94aac0$d5be0040$@org> References: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from wolverine02.qualcomm.com ([199.106.114.251]:17095 "EHLO wolverine02.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751405Ab1GRFV5 (ORCPT ); Mon, 18 Jul 2011 01:21:57 -0400 In-Reply-To: Content-Language: en-us Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: 'Subhash Jadavani' , linux-mmc@vger.kernel.org, prakity@marvell.com, arindam.nath@amd.com Arindam/Philips, Can you help me with below query? Regards, Subhash > -----Original Message----- > From: linux-mmc-owner@vger.kernel.org [mailto:linux-mmc- > owner@vger.kernel.org] On Behalf Of Subhash Jadavani > Sent: Thursday, July 14, 2011 5:09 PM > To: linux-mmc@vger.kernel.org; prakity@marvell.com; > arindam.nath@amd.com > Subject: Question regarding SDR104 bus speed mode > > Hi Arindam, Philips and All, > > According to SD 3.0 spec (section 3.9.6), cards may require current > upto > 800 mA while running in SDR104. However Max. supported current from > PMIC > regulator connected to sd card slot on my board is 600mA. > > I have these questions: > 1. So does this mean we can't support the SDR104 mode if regulator > current > driving capacity is not upto 800 mA? > > 2. I am able to make SD card run in SDR104 mode even if the max. > current > supplied by regulator is upto 600 mA. So is this 800mA requirement is > **must** condition to support SDR104 mode reliably? > > Regards, > Subhash > > -- > Sent by a consultant of the Qualcomm Innovation Center, Inc. > The Qualcomm Innovation Center, Inc. is a member of the Code Aurora > Forum. > > -- > To unsubscribe from this list: send the line "unsubscribe linux-mmc" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html