From patchwork Wed Oct 30 14:12:15 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Aisheng Dong X-Patchwork-Id: 3114931 Return-Path: X-Original-To: patchwork-linux-mmc@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 36DE0BF924 for ; Wed, 30 Oct 2013 14:31:39 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 8D82320254 for ; Wed, 30 Oct 2013 14:31:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DAD9620170 for ; Wed, 30 Oct 2013 14:31:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752973Ab3J3Ob2 (ORCPT ); Wed, 30 Oct 2013 10:31:28 -0400 Received: from co1ehsobe005.messaging.microsoft.com ([216.32.180.188]:11740 "EHLO co1outboundpool.messaging.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752738Ab3J3Ob1 (ORCPT ); Wed, 30 Oct 2013 10:31:27 -0400 Received: from mail45-co1-R.bigfish.com (10.243.78.250) by CO1EHSOBE022.bigfish.com (10.243.66.85) with Microsoft SMTP Server id 14.1.225.22; Wed, 30 Oct 2013 14:31:26 +0000 Received: from mail45-co1 (localhost [127.0.0.1]) by mail45-co1-R.bigfish.com (Postfix) with ESMTP id B69B3A80111; Wed, 30 Oct 2013 14:31:26 +0000 (UTC) X-Forefront-Antispam-Report: CIP:70.37.183.190; KIP:(null); UIP:(null); IPV:NLI; H:mail.freescale.net; RD:none; EFVD:NLI X-SpamScore: 3 X-BigFish: VS3(zzzz1f42h208ch1ee6h1de0h1fdah2073h1202h1e76h1d1ah1d2ah1fc6h1082kzz1de098h8275bh1de097hz2dh2a8h839hd24he5bhf0ah1288h12a5h12a9h12bdh12e5h137ah139eh13b6h1441h1504h1537h162dh1631h1758h1898h18e1h1946h19b5h1ad9h1b0ah1b2fh1fb3h1d0ch1d2eh1d3fh1dfeh1dffh1e23h1fe8h1ff5h2218h2216h1155h) Received: from mail45-co1 (localhost.localdomain [127.0.0.1]) by mail45-co1 (MessageSwitch) id 1383143483781410_504; Wed, 30 Oct 2013 14:31:23 +0000 (UTC) Received: from CO1EHSMHS017.bigfish.com (unknown [10.243.78.229]) by mail45-co1.bigfish.com (Postfix) with ESMTP id BAF14AE0040; Wed, 30 Oct 2013 14:31:23 +0000 (UTC) Received: from mail.freescale.net (70.37.183.190) by CO1EHSMHS017.bigfish.com (10.243.66.27) with Microsoft SMTP Server (TLS) id 14.16.227.3; Wed, 30 Oct 2013 14:31:23 +0000 Received: from tx30smr01.am.freescale.net (10.81.153.31) by 039-SN1MMR1-004.039d.mgd.msft.net (10.84.1.14) with Microsoft SMTP Server (TLS) id 14.3.158.2; Wed, 30 Oct 2013 14:31:21 +0000 Received: from shlinux2.ap.freescale.net (shlinux2.ap.freescale.net [10.192.224.44]) by tx30smr01.am.freescale.net (8.14.3/8.14.0) with ESMTP id r9UEVAq4012805; Wed, 30 Oct 2013 07:31:17 -0700 From: Dong Aisheng To: CC: , , , , , Subject: [PATCH 2/5] mmc: sdhci-esdhc-imx: tuning bits should not be cleared during reset Date: Wed, 30 Oct 2013 22:12:15 +0800 Message-ID: <1383142338-25062-3-git-send-email-b29396@freescale.com> X-Mailer: git-send-email 1.7.2.rc3 In-Reply-To: <1383142338-25062-1-git-send-email-b29396@freescale.com> References: <1383142338-25062-1-git-send-email-b29396@freescale.com> MIME-Version: 1.0 X-OriginatorOrg: freescale.com X-FOPE-CONNECTOR: Id%0$Dn%*$RO%0$TLS%0$FQDN%$TlsDn% Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org X-Spam-Status: No, score=-7.4 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 We should not clear tuning bits during reset or the SD3.0/eMMC4.5 card working on UHS mode may not work after reset since the former tuning settings was lost. Signed-off-by: Dong Aisheng --- drivers/mmc/host/sdhci-esdhc-imx.c | 7 ++++++- 1 files changed, 6 insertions(+), 1 deletions(-) diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c index 5816585..f5e1dcf 100644 --- a/drivers/mmc/host/sdhci-esdhc-imx.c +++ b/drivers/mmc/host/sdhci-esdhc-imx.c @@ -45,6 +45,8 @@ #define ESDHC_MIX_CTRL_FBCLK_SEL (1 << 25) /* Bits 3 and 6 are not SDHCI standard definitions */ #define ESDHC_MIX_CTRL_SDHCI_MASK 0xb7 +/* Tuning bits */ +#define ESDHC_MIX_CTRL_TUNING_MASK 0x03c00000 /* dll control register */ #define ESDHC_DLL_CTRL 0x60 @@ -562,7 +564,10 @@ static void esdhc_writeb_le(struct sdhci_host *host, u8 val, int reg) * Do it manually here. */ if (esdhc_is_usdhc(imx_data)) { - writel(0, host->ioaddr + ESDHC_MIX_CTRL); + /* the tuning bits should be kept during reset */ + new_val = readl(host->ioaddr + ESDHC_MIX_CTRL); + writel(new_val & ESDHC_MIX_CTRL_TUNING_MASK, + host->ioaddr + ESDHC_MIX_CTRL); imx_data->is_ddr = 0; } }