From patchwork Sat Oct 13 02:17:10 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Can Guo X-Patchwork-Id: 10639837 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 44DDB157A for ; Sat, 13 Oct 2018 02:20:43 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4BB8D2B69A for ; Sat, 13 Oct 2018 02:20:43 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3F3922BA83; Sat, 13 Oct 2018 02:20:43 +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=unavailable 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 8A1AE2BA76 for ; Sat, 13 Oct 2018 02:20:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726030AbeJMJzw (ORCPT ); Sat, 13 Oct 2018 05:55:52 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:55322 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725970AbeJMJzw (ORCPT ); Sat, 13 Oct 2018 05:55:52 -0400 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 479E060BFE; Sat, 13 Oct 2018 02:20:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1539397235; bh=Is9RPBX3dUJkwVn3h7PwR1/BiatLF4RnifcY99EdzAg=; h=From:To:Cc:Subject:Date:From; b=JL2cRDhXV5y2RQlxxV/PijyoIra4dXADftxX97tFzT5F7cEJOJ8ysNSVHkxnGndME vs7oFZZzPDVNao88u3+iOZrU/3QMbLtEzSlK04NkpnX9q4xsm9j4xEfaL6Oau5ebwP 5owJ9n/9LvnbRNhfjgebNEUScHGJWj2OcTYxLIy4= 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 70F2B6079C; Sat, 13 Oct 2018 02:20:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1539397234; bh=Is9RPBX3dUJkwVn3h7PwR1/BiatLF4RnifcY99EdzAg=; h=From:To:Cc:Subject:Date:From; b=PN17RrkW3AyKesbR/wEcBx52hOwMTnTo4hL6tUZBPLKtA+vaKKTuVCuMJEiO5QKU7 cgRU1usVjDI3I8R3FIhVSWYN0Et+XrLU0rSPyN0OiQAnYUYS9azWP5AS6jJZvHoxxk E0JclN4jcLH/NnrC0Y3z0uvxVitZr6sYkGNJ+IVw= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 70F2B6079C 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 v4 1/1] scsi: ufs: make UFS Tx lane1 clock optional for QCOM platforms Date: Fri, 12 Oct 2018 19:17:10 -0700 Message-Id: <1539397031-30014-1-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 v3: - Incorporated review comments from Doug. 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 | 54 +++++++++++++++++++++++---------------------- 1 file changed, 28 insertions(+), 26 deletions(-) diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c index 2b38db2..9f9c6c7 100644 --- a/drivers/scsi/ufs/ufs-qcom.c +++ b/drivers/scsi/ufs/ufs-qcom.c @@ -79,20 +79,27 @@ 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 +120,9 @@ 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 +146,21 @@ 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 +174,25 @@ 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;