From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-4098462-1520453186-2-9843058802033940666 X-Sieve: CMU Sieve 3.0 X-Spam-known-sender: no X-Spam-score: 0.0 X-Spam-hits: BAYES_00 -1.9, HEADER_FROM_DIFFERENT_DOMAINS 0.25, ME_NOAUTH 0.01, RCVD_IN_DNSWL_HI -5, T_RP_MATCHES_RCVD -0.01, LANGUAGES en, BAYES_USED global, SA_VERSION 3.4.0 X-Spam-source: IP='209.132.180.67', Host='vger.kernel.org', Country='CN', FromHeader='org', MailFrom='org' X-Spam-charsets: plain='UTF-8' X-Resolved-to: greg@kroah.com X-Delivered-to: greg@kroah.com X-Mail-from: stable-owner@vger.kernel.org ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=arctest; t=1520453186; b=F7W8tx2IZl6j+9KkJ86T540Kk/1khlcSuYBwwf+UaQl7Wf7 FffooRmVPRdf1cLeOCciw/bVarDky4ZYaWAmNG8VsptWrz/zUODwPioizmiyfMU+ NBEd5x19YwbdJvYPNZNpgYZPYCDbGrRqZ7J8MfNE0XOSLJ1oTvmjs+TbpQ8fadH7 hXDhde3QxZKQzzp434gYOdinwTs/riA1HIpXr/ceNmN3eipyBf4nUTuRKg6x4q4M sQx9BfqIYh9NHUOmtd0ILBtKFf6I83uwwG5GQ9nNnA7tO+tT5HtZvo78otNY7d+F fEFTVyNjHUGXt4ZNq5609Kte0vjqBuqw0rgx2/A== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=from:to:cc:subject:date:message-id :in-reply-to:references:mime-version:content-type:sender :list-id; s=arctest; t=1520453186; bh=5Nf17L3qFHkbRQFB6+mbZVyyjn zEQ8CA7upesnP5Njs=; b=uAcNSsf33PgEhV9rE5s6azoZpIVByDhy/TnypxR4WD W3eAErpBZvKnL+0NO//ZdAupAIi1eTpzrSv3yieMz6xOUoz3IuT2Jk1EBTKZOv0v OTArNYzvYmYc1TDTCtClliu5J9KeTm16s20FnxdnVjGOcfGoD6BRHIVFdJWuvT6i alBT5J9QKkbnSoOCUOTd7sQjehYDK4oSJcaFfl5zFamdZrL4NkoUx/5hnk/Syff4 UcfNNqwjw8M0nKPenOOD7LUudKaaAlE/aEdeWHnms7lXcvGsylzOd41kBxSoDz/P GiWT1hb72mj3Y7afjiY2NbWhstA25jLx0kX2H1UjnSaQ== ARC-Authentication-Results: i=1; mx5.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=linuxfoundation.org; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-category=clean score=-100 state=0; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=linuxfoundation.org header.result=pass header_is_org_domain=yes Authentication-Results: mx5.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=linuxfoundation.org; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-category=clean score=-100 state=0; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=linuxfoundation.org header.result=pass header_is_org_domain=yes Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965473AbeCGTqL (ORCPT ); Wed, 7 Mar 2018 14:46:11 -0500 Received: from mail.linuxfoundation.org ([140.211.169.12]:44470 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965391AbeCGTqI (ORCPT ); Wed, 7 Mar 2018 14:46:08 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Shawn Lin , Jaehoon Chung , Ulf Hansson Subject: [PATCH 4.14 017/110] mmc: dw_mmc: Avoid accessing registers in runtime suspended state Date: Wed, 7 Mar 2018 11:38:00 -0800 Message-Id: <20180307191041.932087686@linuxfoundation.org> X-Mailer: git-send-email 2.16.2 In-Reply-To: <20180307191039.748351103@linuxfoundation.org> References: <20180307191039.748351103@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Shawn Lin commit 5b43df8b4c1a7f0c3fbf793c9566068e6b1e570c upstream. cat /sys/kernel/debug/mmc0/regs will hang up the system since it's in runtime suspended state, so the genpd and biu_clk is off. This patch fixes this problem by calling pm_runtime_get_sync to wake it up before reading the registers. Fixes: e9ed8835e990 ("mmc: dw_mmc: add runtime PM callback") Cc: Signed-off-by: Shawn Lin Reviewed-by: Jaehoon Chung Signed-off-by: Ulf Hansson Signed-off-by: Greg Kroah-Hartman --- drivers/mmc/host/dw_mmc.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -165,6 +165,8 @@ static int dw_mci_regs_show(struct seq_f { struct dw_mci *host = s->private; + pm_runtime_get_sync(host->dev); + seq_printf(s, "STATUS:\t0x%08x\n", mci_readl(host, STATUS)); seq_printf(s, "RINTSTS:\t0x%08x\n", mci_readl(host, RINTSTS)); seq_printf(s, "CMD:\t0x%08x\n", mci_readl(host, CMD)); @@ -172,6 +174,8 @@ static int dw_mci_regs_show(struct seq_f seq_printf(s, "INTMASK:\t0x%08x\n", mci_readl(host, INTMASK)); seq_printf(s, "CLKENA:\t0x%08x\n", mci_readl(host, CLKENA)); + pm_runtime_put_autosuspend(host->dev); + return 0; }