From patchwork Wed Sep 30 03:28:08 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chaotian Jing X-Patchwork-Id: 7292451 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id C2460BEEA4 for ; Wed, 30 Sep 2015 03:31:48 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id EEF37206A6 for ; Wed, 30 Sep 2015 03:31:47 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id AC4EA206A3 for ; Wed, 30 Sep 2015 03:31:46 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1Zh85I-00007u-RJ; Wed, 30 Sep 2015 03:29:36 +0000 Received: from [210.61.82.184] (helo=mailgw02.mediatek.com) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Zh84a-00005Q-2j; Wed, 30 Sep 2015 03:28:52 +0000 X-Listener-Flag: 11101 Received: from mtkhts09.mediatek.inc [(172.21.101.70)] by mailgw02.mediatek.com (envelope-from ) (mhqrelay.mediatek.com ESMTP with TLS) with ESMTP id 784999785; Wed, 30 Sep 2015 11:28:22 +0800 Received: from localhost.localdomain (10.17.3.153) by mtkhts09.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 14.3.181.6; Wed, 30 Sep 2015 11:28:21 +0800 From: Chaotian Jing To: Ulf Hansson Subject: [PATCH] mmc: core: Fix init_card in 52Mhz Date: Wed, 30 Sep 2015 11:28:08 +0800 Message-ID: <1443583688-1952-1-git-send-email-chaotian.jing@mediatek.com> X-Mailer: git-send-email 1.8.1.1.dirty MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150929_202852_307608_35F15974 X-CRM114-Status: GOOD ( 13.40 ) X-Spam-Score: -1.1 (-) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Gwendal Grignou , srv_heupstream@mediatek.com, linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, Adrian Hunter , linux-mediatek@lists.infradead.org, Chaotian Jing , Sascha Hauer , Matthias Brugger , Johan Rudholm , linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_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 Suppose that we got a data crc error, and it triggers the mmc_reset. mmc_reset will call mmc_send_status to see if HW reset was supported. before issue CMD13, it will do retune, and if EMMC was in HS400 mode, it will reduce frequency to 52Mhz firstly, that results in card init was doing at 52Mhz, So need ensure frequency is lower than 400Khz when re-init card. Signed-off-by: Chaotian Jing --- drivers/mmc/core/mmc.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index e726903..f2d0c2a 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -1945,6 +1945,7 @@ static int mmc_reset(struct mmc_host *host) /* Set initial state and call mmc_set_ios */ mmc_set_initial_state(host); + mmc_set_clock(host, host->f_init); mmc_host_clk_release(host); return mmc_init_card(host, card->ocr, card);