From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Subhash Jadavani" Subject: Question regarding SDR104 bus speed mode Date: Thu, 14 Jul 2011 04:38:34 -0700 (PDT) Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Return-path: Received: from wolverine01.qualcomm.com ([199.106.114.254]:40099 "EHLO wolverine01.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754509Ab1GNLiq (ORCPT ); Thu, 14 Jul 2011 07:38:46 -0400 Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: linux-mmc@vger.kernel.org, prakity@marvell.com, arindam.nath@amd.com 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.