From patchwork Sat Feb 8 00:50:29 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Can Guo X-Patchwork-Id: 190409 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DB6FBC35242 for ; Sat, 8 Feb 2020 00:51:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B0E3821741 for ; Sat, 8 Feb 2020 00:51:13 +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="A3RLFKBY" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727571AbgBHAvM (ORCPT ); Fri, 7 Feb 2020 19:51:12 -0500 Received: from mail25.static.mailgun.info ([104.130.122.25]:60387 "EHLO mail25.static.mailgun.info" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727118AbgBHAvM (ORCPT ); Fri, 7 Feb 2020 19:51:12 -0500 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1581123071; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=i0UPuEk6K/s4FZ/ntBE5LFbUEQNQedXOFXrUR/093vk=; b=A3RLFKBYvZBd75pSmny4qddqJqEcPgHVd9CPxpEJuBw1unWhILrg8ODzUFPUyUAlgEuTzYi0 cpzeEcZHXV0Is8mYT1TeKc5Jf9+tjYkk/hCNWW++y8z1wDIVPSBo4eckUwbB+KZ/qy18t4qT kTzjDfCzlSTK/RJLTYaDIOuxE/k= X-Mailgun-Sending-Ip: 104.130.122.25 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 5e3e05ff.7f4e4b528df8-smtp-out-n02; Sat, 08 Feb 2020 00:51:11 -0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1001) id B4723C447B2; Sat, 8 Feb 2020 00:51:09 +0000 (UTC) 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 5D22AC4479C; Sat, 8 Feb 2020 00:51:08 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 5D22AC4479C 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 , Bjorn Andersson , Alim Akhtar , Avri Altman , "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 7/7] scsi: ufs-qcom: Delay specific time before gate ref clk Date: Fri, 7 Feb 2020 16:50:29 -0800 Message-Id: <1581123030-12023-8-git-send-email-cang@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1581123030-12023-1-git-send-email-cang@codeaurora.org> References: <1581123030-12023-1-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 Reviewed-by: Asutosh Das Reviewed-by: Hongwu Su diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c index 85d7c17..db14a83 100644 --- a/drivers/scsi/ufs/ufs-qcom.c +++ b/drivers/scsi/ufs/ufs-qcom.c @@ -845,11 +845,27 @@ 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) { + unsigned long gating_wait; + + gating_wait = host->hba->dev_info.clk_gating_wait_us; + if (!gating_wait) { + udelay(1); + } else { + /* + * bRefClkGatingWaitTime defines the minimum + * time for which the reference clock is + * required by device during transition from + * HS-MODE to LS-MODE or HIBERN8 state. Give it + * more delay to be on the safe side. + */ + gating_wait += 10; + usleep_range(gating_wait, gating_wait + 10); + } + } writel_relaxed(temp, host->dev_ref_clk_ctrl_mmio);