From patchwork Thu Jan 23 06:12:24 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Can Guo X-Patchwork-Id: 11346807 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 3D563924 for ; Thu, 23 Jan 2020 06:13:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1619724684 for ; Thu, 23 Jan 2020 06:13:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="key not found in DNS" (0-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="jJHnoaYQ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726621AbgAWGNR (ORCPT ); Thu, 23 Jan 2020 01:13:17 -0500 Received: from mail26.static.mailgun.info ([104.130.122.26]:49975 "EHLO mail26.static.mailgun.info" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728668AbgAWGNQ (ORCPT ); Thu, 23 Jan 2020 01:13:16 -0500 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1579759996; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=rBbiMubrsSJY16sYdP0KKGOi7Z2x2RztZoP0ot3NB4I=; b=jJHnoaYQ3gS54e2Wpuw5/xPh9wBgsIouDqQyGfvUUM+pTRnnZdGZ3cx7xvQ+kJvWYNdS4y5O Ml445jlpARn74Y1PJ6jhHVdenVeIuReP48c4j0XJbiUSwKc1PlfZVqmRjWmsOwOpFryzM5ku AUsJcScHeTkgUXNt4sGsY0yJWWg= X-Mailgun-Sending-Ip: 104.130.122.26 X-Mailgun-Sid: WyI1MzIzYiIsICJsaW51eC1hcm0tbXNtQHZnZXIua2VybmVsLm9yZyIsICJiZTllNGEiXQ== Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by mxa.mailgun.org with ESMTP id 5e293979.7f7e6e746730-smtp-out-n01; Thu, 23 Jan 2020 06:13:13 -0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1001) id AB542C43383; Thu, 23 Jan 2020 06:13:12 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-caf-mail-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=2.0 tests=ALL_TRUSTED,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.0 Received: from pacamara-linux.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: cang) by smtp.codeaurora.org (Postfix) with ESMTPSA id 258D6C447A9; Thu, 23 Jan 2020 06:13:11 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 258D6C447A9 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=none smtp.mailfrom=cang@codeaurora.org From: Can Guo To: asutoshd@codeaurora.org, nguyenb@codeaurora.org, hongwus@codeaurora.org, rnayak@codeaurora.org, linux-scsi@vger.kernel.org, kernel-team@android.com, saravanak@google.com, salyzyn@google.com, cang@codeaurora.org Cc: Andy Gross , Alim Akhtar , Avri Altman , Pedro Sousa , "James E.J. Bottomley" , "Martin K. Petersen" , linux-arm-msm@vger.kernel.org (open list:ARM/QUALCOMM SUPPORT), linux-kernel@vger.kernel.org (open list) Subject: [PATCH v3 7/8] scsi: ufs-qcom: Delay specific time before gate ref clk Date: Wed, 22 Jan 2020 22:12:24 -0800 Message-Id: <1579759946-5448-8-git-send-email-cang@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1579759946-5448-1-git-send-email-cang@codeaurora.org> References: <1579759946-5448-1-git-send-email-cang@codeaurora.org> Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org After enter hibern8, as UFS JEDEC ver 3.0 requires, a specific gating wait time is required before disable the device reference clock. If it is not specified, use the old delay. Signed-off-by: Can Guo --- drivers/scsi/ufs/ufs-qcom.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c index 85d7c17..3b5b2d9 100644 --- a/drivers/scsi/ufs/ufs-qcom.c +++ b/drivers/scsi/ufs/ufs-qcom.c @@ -833,6 +833,8 @@ static int ufs_qcom_bus_register(struct ufs_qcom_host *host) static void ufs_qcom_dev_ref_clk_ctrl(struct ufs_qcom_host *host, bool enable) { + unsigned long gating_wait; + if (host->dev_ref_clk_ctrl_mmio && (enable ^ host->is_dev_ref_clk_enabled)) { u32 temp = readl_relaxed(host->dev_ref_clk_ctrl_mmio); @@ -845,11 +847,16 @@ static void ufs_qcom_dev_ref_clk_ctrl(struct ufs_qcom_host *host, bool enable) /* * If we are here to disable this clock it might be immediately * after entering into hibern8 in which case we need to make - * sure that device ref_clk is active at least 1us after the + * sure that device ref_clk is active for specific time after * hibern8 enter. */ - if (!enable) - udelay(1); + if (!enable) { + gating_wait = host->hba->dev_info.clk_gating_wait_us; + if (!gating_wait) + udelay(1); + else + usleep_range(gating_wait, gating_wait + 10); + } writel_relaxed(temp, host->dev_ref_clk_ctrl_mmio);