From patchwork Sun Mar 6 11:55:42 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yaniv Gardi X-Patchwork-Id: 8512651 Return-Path: X-Original-To: patchwork-linux-arm-msm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id B61EFC0553 for ; Sun, 6 Mar 2016 11:56:29 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id BF02C2017D for ; Sun, 6 Mar 2016 11:56:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9F7B120172 for ; Sun, 6 Mar 2016 11:56:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751460AbcCFL4V (ORCPT ); Sun, 6 Mar 2016 06:56:21 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:33288 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751452AbcCFL4P (ORCPT ); Sun, 6 Mar 2016 06:56:15 -0500 Received: from smtp.codeaurora.org (localhost [127.0.0.1]) by smtp.codeaurora.org (Postfix) with ESMTP id 35D2060DF1; Sun, 6 Mar 2016 11:56:14 +0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 20ECD60CF7; Sun, 6 Mar 2016 11:56:13 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from lx-ygardi.mea.qualcomm.com (unknown [185.23.60.4]) (using TLSv1.1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: ygardi@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id E531A60898; Sun, 6 Mar 2016 11:56:08 +0000 (UTC) From: Yaniv Gardi To: James.Bottomley@HansenPartnership.com Cc: linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, linux-arm-msm@vger.kernel.org, santoshsy@gmail.com, linux-scsi-owner@vger.kernel.org, ygardi@codeaurora.org, Gilad Broner , Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , Vinayak Holikatti , "James E.J. Bottomley" , "Martin K. Petersen" , Hannes Reinecke , devicetree@vger.kernel.org (open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS) Subject: [PATCH v6 01/17] scsi: ufs-qcom: add number of lanes per direction Date: Sun, 6 Mar 2016 13:55:42 +0200 Message-Id: <1457265358-31635-2-git-send-email-ygardi@codeaurora.org> X-Mailer: git-send-email 1.8.5.2 In-Reply-To: <1457265358-31635-1-git-send-email-ygardi@codeaurora.org> References: <1457265358-31635-1-git-send-email-ygardi@codeaurora.org> X-Virus-Scanned: ClamAV using ClamSMTP Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Different platform may have different number of lanes for the UFS link. Add parameter to device tree specifying how many lanes should be configured for the UFS link. Signed-off-by: Gilad Broner Signed-off-by: Yaniv Gardi --- .../devicetree/bindings/ufs/ufshcd-pltfrm.txt | 3 ++ drivers/scsi/ufs/ufs-qcom.c | 39 ++++++++++++---------- drivers/scsi/ufs/ufshcd-pltfrm.c | 19 +++++++++++ drivers/scsi/ufs/ufshcd.c | 1 + drivers/scsi/ufs/ufshcd.h | 2 ++ 5 files changed, 47 insertions(+), 17 deletions(-) diff --git a/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt b/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt index 03c0e98..66f6adf 100644 --- a/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt +++ b/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt @@ -38,6 +38,9 @@ Optional properties: defined or a value in the array is "0" then it is assumed that the frequency is set by the parent clock or a fixed rate clock source. +-lanes-per-direction : number of lanes available per direction - either 1 or 2. + Note that it is assume same number of lanes is used both + directions at once. If not specified, default is 2 lanes per direction. Note: If above properties are not defined it can be assumed that the supply regulators or clocks are always on. diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c index 4f38d00..ed57729 100644 --- a/drivers/scsi/ufs/ufs-qcom.c +++ b/drivers/scsi/ufs/ufs-qcom.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2013-2015, Linux Foundation. All rights reserved. + * Copyright (c) 2013-2016, Linux Foundation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 and @@ -132,21 +132,24 @@ static int ufs_qcom_enable_lane_clks(struct ufs_qcom_host *host) if (err) goto disable_rx_l0; - err = ufs_qcom_host_clk_enable(dev, "rx_lane1_sync_clk", - host->rx_l1_sync_clk); - if (err) - goto disable_tx_l0; + if (host->hba->lanes_per_direction > 1) { + err = ufs_qcom_host_clk_enable(dev, "rx_lane1_sync_clk", + host->rx_l1_sync_clk); + if (err) + goto disable_tx_l0; - err = ufs_qcom_host_clk_enable(dev, "tx_lane1_sync_clk", - host->tx_l1_sync_clk); - if (err) - goto disable_rx_l1; + err = ufs_qcom_host_clk_enable(dev, "tx_lane1_sync_clk", + host->tx_l1_sync_clk); + if (err) + goto disable_rx_l1; + } host->is_lane_clks_enabled = true; goto out; disable_rx_l1: - clk_disable_unprepare(host->rx_l1_sync_clk); + if (host->hba->lanes_per_direction > 1) + clk_disable_unprepare(host->rx_l1_sync_clk); disable_tx_l0: clk_disable_unprepare(host->tx_l0_sync_clk); disable_rx_l0: @@ -170,14 +173,16 @@ static int ufs_qcom_init_lane_clks(struct ufs_qcom_host *host) if (err) goto out; - err = ufs_qcom_host_clk_get(dev, "rx_lane1_sync_clk", - &host->rx_l1_sync_clk); - if (err) - goto out; - - err = ufs_qcom_host_clk_get(dev, "tx_lane1_sync_clk", - &host->tx_l1_sync_clk); + /* 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); + if (err) + goto out; + err = ufs_qcom_host_clk_get(dev, "tx_lane1_sync_clk", + &host->tx_l1_sync_clk); + } out: return err; } diff --git a/drivers/scsi/ufs/ufshcd-pltfrm.c b/drivers/scsi/ufs/ufshcd-pltfrm.c index d2a7b12..718f12e 100644 --- a/drivers/scsi/ufs/ufshcd-pltfrm.c +++ b/drivers/scsi/ufs/ufshcd-pltfrm.c @@ -40,6 +40,8 @@ #include "ufshcd.h" #include "ufshcd-pltfrm.h" +#define UFSHCD_DEFAULT_LANES_PER_DIRECTION 2 + static int ufshcd_parse_clock_info(struct ufs_hba *hba) { int ret = 0; @@ -277,6 +279,21 @@ void ufshcd_pltfrm_shutdown(struct platform_device *pdev) } EXPORT_SYMBOL_GPL(ufshcd_pltfrm_shutdown); +static void ufshcd_init_lanes_per_dir(struct ufs_hba *hba) +{ + struct device *dev = hba->dev; + int ret; + + ret = of_property_read_u32(dev->of_node, "lanes-per-direction", + &hba->lanes_per_direction); + if (ret) { + dev_dbg(hba->dev, + "%s: failed to read lanes-per-direction, ret=%d\n", + __func__, ret); + hba->lanes_per_direction = UFSHCD_DEFAULT_LANES_PER_DIRECTION; + } +} + /** * ufshcd_pltfrm_init - probe routine of the driver * @pdev: pointer to Platform device handle @@ -331,6 +348,8 @@ int ufshcd_pltfrm_init(struct platform_device *pdev, pm_runtime_set_active(&pdev->dev); pm_runtime_enable(&pdev->dev); + ufshcd_init_lanes_per_dir(hba); + err = ufshcd_init(hba, mmio_base, irq); if (err) { dev_err(dev, "Initialization failed\n"); diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 9c1b94b..a8e42df 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -40,6 +40,7 @@ #include #include +#include #include "ufshcd.h" #include "unipro.h" diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index e3931d0..9ae7f85 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -509,6 +509,8 @@ struct ufs_hba { bool wlun_dev_clr_ua; + /* Number of lanes available (1 or 2) for Rx/Tx */ + u32 lanes_per_direction; struct ufs_pa_layer_attr pwr_info; struct ufs_pwr_mode_info max_pwr_info;