From patchwork Thu Jan 5 01:41:59 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: ziyuan X-Patchwork-Id: 9498217 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 07479606B4 for ; Thu, 5 Jan 2017 01:44:35 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E3110283BA for ; Thu, 5 Jan 2017 01:44:34 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D5670283BC; Thu, 5 Jan 2017 01:44:34 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 96E9A283BA for ; Thu, 5 Jan 2017 01:44:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966185AbdAEBoa (ORCPT ); Wed, 4 Jan 2017 20:44:30 -0500 Received: from regular1.263xmail.com ([211.150.99.141]:35757 "EHLO regular1.263xmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754542AbdAEBo3 (ORCPT ); Wed, 4 Jan 2017 20:44:29 -0500 Received: from xzy.xu?rock-chips.com (unknown [192.168.167.171]) by regular1.263xmail.com (Postfix) with ESMTP id DE05163; Thu, 5 Jan 2017 09:42:07 +0800 (CST) X-263anti-spam: KSV:0; X-MAIL-GRAY: 0 X-MAIL-DELIVERY: 1 X-KSVirus-check: 0 X-ABS-CHECKED: 4 Received: from localhost.localdomain (localhost [127.0.0.1]) by smtp.263.net (Postfix) with ESMTP id 4DA573EF; Thu, 5 Jan 2017 09:42:06 +0800 (CST) X-RL-SENDER: xzy.xu@rock-chips.com X-FST-TO: ulf.hansson@linaro.org X-SENDER-IP: 103.29.142.67 X-LOGIN-NAME: xzy.xu@rock-chips.com X-UNIQUE-TAG: <6d7637d18f458a237ccb51c1a44a4139> X-ATTACHMENT-NUM: 0 X-SENDER: xzy.xu@rock-chips.com X-DNS-TYPE: 0 Received: from localhost.localdomain (unknown [103.29.142.67]) by smtp.263.net (Postfix) whith ESMTP id 26550O5E7X1; Thu, 05 Jan 2017 09:42:07 +0800 (CST) From: Ziyuan Xu To: ulf.hansson@linaro.org, jh80.chung@samsung.com, shawn.lin@rock-chips.com Cc: linux-mmc@vger.kernel.org, randy.li@rock-chips.com, linux-rockchip@lists.infradead.org, Ziyuan Xu , linux-kernel@vger.kernel.org Subject: [PATCH v3] mmc: dw_mmc: revise the reset path in runtime resume Date: Thu, 5 Jan 2017 09:41:59 +0800 Message-Id: <1483580519-25345-1-git-send-email-xzy.xu@rock-chips.com> X-Mailer: git-send-email 2.7.4 Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Immediately after reset, issue the command which sets update_clock_register_only bit, the card clock will restart. Revise dw_mci_ctrl_reset to dw_mci_reset, which has wrapped this sequence. Moreover, we don't need to reset host without active slot. The patch fixes commit e9ed8835e990 ("mmc: dw_mmc: add runtime PM callback"). MMC_PM_KEEP_POWEP is disabled for SD card and eMMC slots, so that they have no chance to invoke dw_mci_setup_bus for update clock behaviour. Let's consummate it. Reported-by: Randy Li Signed-off-by: Ziyuan Xu --- Changes in v3: - only reset host with active slot. Changes in v2: - update the commit message - use dw_mci_reset instead of dw_mci_ctrl_reset drivers/mmc/host/dw_mmc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index b44306b..bd21242 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -3324,7 +3324,7 @@ int dw_mci_runtime_resume(struct device *dev) if (ret) goto err; - if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_ALL_RESET_FLAGS)) { + if (host->cur_slot && !dw_mci_reset(host)) { clk_disable_unprepare(host->ciu_clk); ret = -ENODEV; goto err;