From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S937540AbdAEBul (ORCPT ); Wed, 4 Jan 2017 20:50:41 -0500 Received: from regular1.263xmail.com ([211.150.99.130]:36735 "EHLO regular1.263xmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933960AbdAEBuj (ORCPT ); Wed, 4 Jan 2017 20:50:39 -0500 X-263anti-spam: KSV:0; X-MAIL-GRAY: 0 X-MAIL-DELIVERY: 1 X-KSVirus-check: 0 X-ABS-CHECKED: 4 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: <2e1d3d02a28bb90f7e4f70cfe35c9d9e> X-ATTACHMENT-NUM: 0 X-DNS-TYPE: 0 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: [RESEND PATCH v3] mmc: dw_mmc: revise the reset path in runtime resume Date: Thu, 5 Jan 2017 09:50:18 +0800 Message-Id: <1483581018-25697-1-git-send-email-xzy.xu@rock-chips.com> X-Mailer: git-send-email 2.7.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 Signed-off-by: Shawn Lin --- Changes in v3: - only reset host with active slot. - add Shawn's Signed-off tag 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; -- 2.7.4