From patchwork Thu Sep 11 14:11:05 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Roese X-Patchwork-Id: 4888101 Return-Path: X-Original-To: patchwork-linux-omap@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 1C1539F32E for ; Thu, 11 Sep 2014 14:10:57 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 8A5A120136 for ; Thu, 11 Sep 2014 14:10:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9C7142020E for ; Thu, 11 Sep 2014 14:10:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752400AbaIKOKw (ORCPT ); Thu, 11 Sep 2014 10:10:52 -0400 Received: from mo4-p05-ob.smtp.rzone.de ([81.169.146.183]:9580 "EHLO mo4-p05-ob.smtp.rzone.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751873AbaIKOKw (ORCPT ); Thu, 11 Sep 2014 10:10:52 -0400 X-RZG-AUTH: :IW0NeWC7b/q2i6W/qstXb1SBUuFnrGohfvxEndrDXKjzPMsB3oimjD61I4fPQhgcxQA= X-RZG-CLASS-ID: mo05 Received: from stefan-work.domain_not_set.invalid (b9168f02.cgn.dg-w.de [185.22.143.2]) by post.strato.de (RZmta 35.8 AUTH) with ESMTPA id D06825q8BEATGJJ; Thu, 11 Sep 2014 16:10:29 +0200 (CEST) From: Stefan Roese To: linux-mmc@vger.kernel.org Cc: linux-omap@vger.kernel.org, Thorsten Einsbein , Ulf Hansson , Balaji T K Subject: [PATCH] mmc: omap_hsmmc: Add small delay after enabling power Date: Thu, 11 Sep 2014 16:11:05 +0200 Message-Id: <1410444665-24492-1-git-send-email-sr@denx.de> X-Mailer: git-send-email 2.1.0 Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org X-Spam-Status: No, score=-9.4 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Thorsten Einsbein On the TAO3530 (OMAP3530 based) we noticed that some SD cards are not detected reliably upon bootup (timeout). Especially the SanDisk Ultra 8GiB seems to be problematic here. The SanDisk Extreme also has this problem on this platform, but not that often. A Samsung 8 GiB type 6 doesn't show this problem at all. This patch now adds a short delay after enabling the power on the slot. With this delay all cards are detected reliably. Signed-off-by: Thorsten Einsbein Signed-off-by: Stefan Roese Cc: Ulf Hansson Cc: Balaji T K --- drivers/mmc/host/omap_hsmmc.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c index 9656726..62ff0a7 100644 --- a/drivers/mmc/host/omap_hsmmc.c +++ b/drivers/mmc/host/omap_hsmmc.c @@ -335,6 +335,10 @@ static int omap_hsmmc_set_power(struct device *dev, int slot, int power_on, ret = mmc_regulator_set_ocr(host->mmc, host->vcc, 0); } + + dev_dbg(host->dev, "omap_hsmmc_set_power: wait a little (slot %d)\n", + slot); + msleep(5); } else { /* Shut down the rail */ if (host->vcc_aux)