From patchwork Sat Feb 23 12:42:57 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marek Vasut X-Patchwork-Id: 222722 X-Patchwork-Delegate: sbabic@denx.de Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from theia.denx.de (theia.denx.de [85.214.87.163]) by ozlabs.org (Postfix) with ESMTP id 790E52C0294 for ; Sat, 23 Feb 2013 23:44:21 +1100 (EST) Received: from localhost (localhost [127.0.0.1]) by theia.denx.de (Postfix) with ESMTP id E800A4A271; Sat, 23 Feb 2013 13:44:06 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at theia.denx.de Received: from theia.denx.de ([127.0.0.1]) by localhost (theia.denx.de [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id GNJ2wg3W9SFO; Sat, 23 Feb 2013 13:44:06 +0100 (CET) Received: from theia.denx.de (localhost [127.0.0.1]) by theia.denx.de (Postfix) with ESMTP id DDEB04A20B; Sat, 23 Feb 2013 13:43:29 +0100 (CET) Received: from localhost (localhost [127.0.0.1]) by theia.denx.de (Postfix) with ESMTP id CBF464A1CA for ; Sat, 23 Feb 2013 13:43:20 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at theia.denx.de Received: from theia.denx.de ([127.0.0.1]) by localhost (theia.denx.de [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id phFBGemxkaD1 for ; Sat, 23 Feb 2013 13:43:15 +0100 (CET) X-policyd-weight: NOT_IN_SBL_XBL_SPAMHAUS=-1.5 NOT_IN_SPAMCOP=-1.5 NOT_IN_BL_NJABL=-1.5 (only DNSBL check requested) Received: from mail-out.m-online.net (mail-out.m-online.net [212.18.0.9]) by theia.denx.de (Postfix) with ESMTPS id 5FB394A178 for ; Sat, 23 Feb 2013 13:43:13 +0100 (CET) Received: from frontend1.mail.m-online.net (unknown [192.168.8.180]) by mail-out.m-online.net (Postfix) with ESMTP id 3ZCpxF3Fdcz4KK48; Sat, 23 Feb 2013 13:43:13 +0100 (CET) X-Auth-Info: lOWBQ9mrT3Oa2GEuO/DxUhTaQzE0z0du6/xZnzeVLNM= Received: from mashiro.lan (unknown [195.140.253.167]) by smtp-auth.mnet-online.de (Postfix) with ESMTPA id 3ZCpxF1xdnzbbh7; Sat, 23 Feb 2013 13:43:13 +0100 (CET) From: Marek Vasut To: u-boot@lists.denx.de Date: Sat, 23 Feb 2013 13:42:57 +0100 Message-Id: <1361623389-31095-1-git-send-email-marex@denx.de> X-Mailer: git-send-email 1.7.10.4 Cc: Marek Vasut , Fabio Estevam , Otavio Salvador Subject: [U-Boot] [PATCH 01/13] mxs: Reset the EMI block on mx23 X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.11 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: u-boot-bounces@lists.denx.de Errors-To: u-boot-bounces@lists.denx.de The real reason for memory instability was the fact that the EMI block was gated and not reset throughout the boards' operation. This patch resets the EMI block properly while also reverts the memory voltage bump. The memory stability issues were caused by the EMI not being reset properly and thus there is no longer need to run the memory at higher voltage than it ought to run at. This partly reverts 8303ed128a55519f19c5f11087032d4bc4e0537a . Signed-off-by: Marek Vasut Cc: Fabio Estevam Cc: Otavio Salvador Cc: Stefano Babic --- arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c b/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c index f8392f6..4a0a5aa 100644 --- a/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c +++ b/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c @@ -27,6 +27,7 @@ #include #include #include +#include #include #include "mxs_init.h" @@ -229,7 +230,7 @@ static void mx23_mem_setup_vddmem(void) struct mxs_power_regs *power_regs = (struct mxs_power_regs *)MXS_POWER_BASE; - writel((0x12 << POWER_VDDMEMCTRL_TRG_OFFSET) | + writel((0x10 << POWER_VDDMEMCTRL_TRG_OFFSET) | POWER_VDDMEMCTRL_ENABLE_ILIMIT | POWER_VDDMEMCTRL_ENABLE_LINREG | POWER_VDDMEMCTRL_PULLDOWN_ACTIVE, @@ -237,13 +238,20 @@ static void mx23_mem_setup_vddmem(void) early_delay(10000); - writel((0x12 << POWER_VDDMEMCTRL_TRG_OFFSET) | + writel((0x10 << POWER_VDDMEMCTRL_TRG_OFFSET) | POWER_VDDMEMCTRL_ENABLE_LINREG, &power_regs->hw_power_vddmemctrl); } static void mx23_mem_init(void) { + /* + * Reset/ungate the EMI block. This is essential, otherwise the system + * suffers from memory instability. This thing is mx23 specific and is + * no longer present on mx28. + */ + mxs_reset_block((struct mxs_register_32 *)MXS_EMI_BASE); + mx23_mem_setup_vddmem(); /*