From patchwork Fri Oct 12 01:12:16 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Can Guo X-Patchwork-Id: 10637697 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E6F7115E2 for ; Fri, 12 Oct 2018 01:12:34 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D1B352C3EE for ; Fri, 12 Oct 2018 01:12:34 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C3B852C3F6; Fri, 12 Oct 2018 01:12:34 +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=-7.7 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,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 2FEF22C3EE for ; Fri, 12 Oct 2018 01:12:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727197AbeJLImT (ORCPT ); Fri, 12 Oct 2018 04:42:19 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:34386 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726061AbeJLImT (ORCPT ); Fri, 12 Oct 2018 04:42:19 -0400 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 9573460C60; Fri, 12 Oct 2018 01:12:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1539306746; bh=vKq1IyoNt6CK+w4Id0ltYEvO0ENuAhTu/+4BkIfWqCE=; h=From:To:Cc:Subject:Date:From; b=GY6b8NgMFfRn4ucuP1Isd99HcJ3xztzrG6L+aNf3nNXxat1wFMvSgRnhUgtBIcoaF rnpRyw8XD3KYHnL6jBFhkh/nPW1zESXvYXJRq2pr48SmPHYbW7yWaD3bZsM/kBJ2AK tEnIUulREDgoYQNzzx8DIkA6KaO6uYLVbgalFfcI= 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@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 4EC5D60A98; Fri, 12 Oct 2018 01:12:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1539306745; bh=vKq1IyoNt6CK+w4Id0ltYEvO0ENuAhTu/+4BkIfWqCE=; h=From:To:Cc:Subject:Date:From; b=N7zIp9ATmEMU3ziS0M1Fq6IajIjnFkKQ/MtgQtgo/cuaEOGjxVUapCg8HU6wCEKa2 y6677BdCpTtVC36G39tQynBfUTLJDVRRK8IKJ77xIcrxiTU0uGTyUG0+Cdohlp8xHW KqaLgqnLGTBpeZvBrlYUfspkQgrMgbkDaCmT6APY= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 4EC5D60A98 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=cang@codeaurora.org From: Can Guo To: dianders@chromium.org, subhashj@codeaurora.org, asutoshd@codeaurora.org, vivek.gautam@codeaurora.org, evgreen@chromium.org, rnayak@codeaurora.org, vinholikatti@gmail.com, jejb@linux.vnet.ibm.com, martin.petersen@oracle.com Cc: linux-scsi@vger.kernel.org, linux-arm-msm@vger.kernel.org, Venkat Gopalakrishnan , Can Guo , linux-kernel@vger.kernel.org (open list) Subject: [PATCH v3 1/1] scsi: ufs: make UFS Tx lane1 clock optional for QCOM platforms Date: Thu, 11 Oct 2018 18:12:16 -0700 Message-Id: <1539306736-9519-1-git-send-email-cang@codeaurora.org> X-Mailer: git-send-email 1.9.1 Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Venkat Gopalakrishnan Per Qcom's UFS host controller HW design, the UFS Tx lane1 clock could be muxed with Tx lane0 clock, hence keep Tx lane1 clock optional by ignoring it if it is not provided in device tree. This change also performs some cleanup to lanes per direction checks when enable/disable lane clocks just for symmetry. Signed-off-by: Venkat Gopalakrishnan Signed-off-by: Subhash Jadavani Signed-off-by: Can Guo Reviewed-by: Vivek Gautam Reviewed-by: Douglas Anderson Tested-by: Douglas Anderson --- Changes since v2: - Incorporated review comments from Doug. Changes since v1: - Incorporated review comments from Doug. - Update the commit title and commit message. drivers/scsi/ufs/ufs-qcom.c | 55 ++++++++++++++++++++++++--------------------- 1 file changed, 29 insertions(+), 26 deletions(-) diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c index 2b38db2..dbc84cb 100644 --- a/drivers/scsi/ufs/ufs-qcom.c +++ b/drivers/scsi/ufs/ufs-qcom.c @@ -79,20 +79,28 @@ static int ufs_qcom_get_connected_tx_lanes(struct ufs_hba *hba, u32 *tx_lanes) } static int ufs_qcom_host_clk_get(struct device *dev, - const char *name, struct clk **clk_out) + const char *name, struct clk **clk_out, bool optional) { struct clk *clk; int err = 0; clk = devm_clk_get(dev, name); - if (IS_ERR(clk)) { - err = PTR_ERR(clk); - dev_err(dev, "%s: failed to get %s err %d", - __func__, name, err); - } else { + if (!IS_ERR(clk)) { *clk_out = clk; + return 0; } + err = PTR_ERR(clk); + + if (optional && err == -ENOENT) { + *clk_out = NULL; + return 0; + } + + if (err != -EPROBE_DEFER) + dev_err(dev, "failed to get %s err %d", + name, err); + return err; } @@ -113,11 +121,9 @@ static void ufs_qcom_disable_lane_clks(struct ufs_qcom_host *host) if (!host->is_lane_clks_enabled) return; - if (host->hba->lanes_per_direction > 1) - clk_disable_unprepare(host->tx_l1_sync_clk); + clk_disable_unprepare(host->tx_l1_sync_clk); clk_disable_unprepare(host->tx_l0_sync_clk); - if (host->hba->lanes_per_direction > 1) - clk_disable_unprepare(host->rx_l1_sync_clk); + clk_disable_unprepare(host->rx_l1_sync_clk); clk_disable_unprepare(host->rx_l0_sync_clk); host->is_lane_clks_enabled = false; @@ -141,24 +147,21 @@ static int ufs_qcom_enable_lane_clks(struct ufs_qcom_host *host) if (err) goto disable_rx_l0; - if (host->hba->lanes_per_direction > 1) { - err = ufs_qcom_host_clk_enable(dev, "rx_lane1_sync_clk", + err = ufs_qcom_host_clk_enable(dev, "rx_lane1_sync_clk", host->rx_l1_sync_clk); - if (err) - goto disable_tx_l0; + if (err) + goto disable_tx_l0; - err = ufs_qcom_host_clk_enable(dev, "tx_lane1_sync_clk", + err = ufs_qcom_host_clk_enable(dev, "tx_lane1_sync_clk", host->tx_l1_sync_clk); - if (err) - goto disable_rx_l1; - } + if (err) + goto disable_rx_l1; host->is_lane_clks_enabled = true; goto out; disable_rx_l1: - if (host->hba->lanes_per_direction > 1) - clk_disable_unprepare(host->rx_l1_sync_clk); + clk_disable_unprepare(host->rx_l1_sync_clk); disable_tx_l0: clk_disable_unprepare(host->tx_l0_sync_clk); disable_rx_l0: @@ -172,25 +175,25 @@ static int ufs_qcom_init_lane_clks(struct ufs_qcom_host *host) int err = 0; struct device *dev = host->hba->dev; - err = ufs_qcom_host_clk_get(dev, - "rx_lane0_sync_clk", &host->rx_l0_sync_clk); + err = ufs_qcom_host_clk_get(dev, "rx_lane0_sync_clk", + &host->rx_l0_sync_clk, false); if (err) goto out; - err = ufs_qcom_host_clk_get(dev, - "tx_lane0_sync_clk", &host->tx_l0_sync_clk); + err = ufs_qcom_host_clk_get(dev, "tx_lane0_sync_clk", + &host->tx_l0_sync_clk, false); if (err) goto out; /* In case of single lane per direction, don't read lane1 clocks */ if (host->hba->lanes_per_direction > 1) { err = ufs_qcom_host_clk_get(dev, "rx_lane1_sync_clk", - &host->rx_l1_sync_clk); + &host->rx_l1_sync_clk, false); if (err) goto out; err = ufs_qcom_host_clk_get(dev, "tx_lane1_sync_clk", - &host->tx_l1_sync_clk); + &host->tx_l1_sync_clk, true); } out: return err;