From patchwork Wed Feb 13 23:25:24 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Evan Green X-Patchwork-Id: 10811307 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 68594746 for ; Wed, 13 Feb 2019 23:26:58 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5729F2DCF4 for ; Wed, 13 Feb 2019 23:26:58 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4AC552DD72; Wed, 13 Feb 2019 23:26:58 +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=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 BB3102DCF4 for ; Wed, 13 Feb 2019 23:26:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390882AbfBMX04 (ORCPT ); Wed, 13 Feb 2019 18:26:56 -0500 Received: from mail-pl1-f193.google.com ([209.85.214.193]:41038 "EHLO mail-pl1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390817AbfBMX0a (ORCPT ); Wed, 13 Feb 2019 18:26:30 -0500 Received: by mail-pl1-f193.google.com with SMTP id k15so1978487pls.8 for ; Wed, 13 Feb 2019 15:26:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=h9HThurJ83+fFieMaOoSrsodQvyRmZformqtiIRg6h8=; b=mPWThKxgFRvWtE9dGW9KJ04d/XALQHxc6gmot78iBuNRpVlOr49U8OKBbn93BjB0Qc OGpgP1ga7x+di9wqTPAJVnR0/KbWFzu8CEnCfmG4Jx1ebQBdmuxhG4jMHTjEA/nDlsfL zIWxjxugdCaQuY/Fjat/fdIBITDKot3VnaeEw= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=h9HThurJ83+fFieMaOoSrsodQvyRmZformqtiIRg6h8=; b=QxPuv6g6pr9qANAJsW6D9UUBe/WFw+f6sj4lTZVAEUru319Y4tJHajd19ABNQZEU35 RKPIxkyPVkIJd6O+KiQsziSxy3Tw+dMm9F4nwoIoDvzBOx9yKMug/1wNJD2AHarO4nR1 jstmIeJrE73SdqhKGuXbrzcmp16k/jEexvcYi/nqf7ikTnywL8d7VwgNylk00Fcq4YTg Rj8KvkIHpD4zFekssB/fxgSma0mD1UOWotMPsS29W9EYCR7rfZ4SFyeIbNtHt0+9zWug zQWYpks8ffyItva4afUbDhbeJOscf1cVl3bJowS33k0rBocnvLFCLYZgKWkGKNTU78jJ cuJw== X-Gm-Message-State: AHQUAuZeJ7Zz/yAPvRgArPqccdaVy8ebpPH3ilHsLmcjKkmyw4xvElFl e9qQW1cq/V4HIBCKZ2KacL0uXw== X-Google-Smtp-Source: AHgI3IYN1uHkqYSPZjl+Bg8kEaQJtM4zYetKBDROADjTN4/G0pReWxyRUKa5qmphjL0kHoJvMzjTVw== X-Received: by 2002:a17:902:8304:: with SMTP id bd4mr704929plb.329.1550100389771; Wed, 13 Feb 2019 15:26:29 -0800 (PST) Received: from evgreen2.mtv.corp.google.com ([2620:15c:202:201:ffda:7716:9afc:1301]) by smtp.gmail.com with ESMTPSA id d129sm560660pfc.31.2019.02.13.15.26.28 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 13 Feb 2019 15:26:29 -0800 (PST) From: Evan Green To: Andy Gross , Kishon Vijay Abraham I Cc: Stephen Boyd , Marc Gonzalez , Can Guo , Vivek Gautam , Douglas Anderson , Asutosh Das , Evan Green , "James E.J. Bottomley" , Vinayak Holikatti , "Martin K. Petersen" , linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 6/8] scsi: ufs: qcom: Expose the reset controller for PHY Date: Wed, 13 Feb 2019 15:25:24 -0800 Message-Id: <20190213232526.26995-7-evgreen@chromium.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190213232526.26995-1-evgreen@chromium.org> References: <20190213232526.26995-1-evgreen@chromium.org> MIME-Version: 1.0 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 Expose a reset controller that the phy will later use to control its own PHY reset in the UFS controller. This will enable the combining of PHY init functionality into a single function. Signed-off-by: Evan Green Reviewed-by: Stephen Boyd --- Note: The remaining changes in this series need this change, since the PHYs now depend on getting the reset controller. Changes in v4: None Changes in v3: - Refactor to only expose the reset controller in one change (Stephen). - Add period to comment (Stephen). - Reset err to 0 in ignored error case (Stephen). - Add include of reset-controller.h (Stephen) Changes in v2: - Remove include of reset.h (Stephen) - Fix error print of phy_power_on (Stephen) - Comment for reset controller warnings on id != 0 (Stephen) - Add static to ufs_qcom_reset_ops (Stephen). drivers/scsi/ufs/Kconfig | 1 + drivers/scsi/ufs/ufs-qcom.c | 52 +++++++++++++++++++++++++++++++++++++ drivers/scsi/ufs/ufs-qcom.h | 4 +++ 3 files changed, 57 insertions(+) diff --git a/drivers/scsi/ufs/Kconfig b/drivers/scsi/ufs/Kconfig index 2ddbb26d9c26..63c5c4115981 100644 --- a/drivers/scsi/ufs/Kconfig +++ b/drivers/scsi/ufs/Kconfig @@ -100,6 +100,7 @@ config SCSI_UFS_QCOM tristate "QCOM specific hooks to UFS controller platform driver" depends on SCSI_UFSHCD_PLATFORM && ARCH_QCOM select PHY_QCOM_UFS + select RESET_CONTROLLER help This selects the QCOM specific additions to UFSHCD platform driver. UFS host on QCOM needs some vendor specific configuration before diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c index 3aeadb14aae1..ab05ef5cfdcd 100644 --- a/drivers/scsi/ufs/ufs-qcom.c +++ b/drivers/scsi/ufs/ufs-qcom.c @@ -16,6 +16,7 @@ #include #include #include +#include #include "ufshcd.h" #include "ufshcd-pltfrm.h" @@ -49,6 +50,11 @@ static void ufs_qcom_get_default_testbus_cfg(struct ufs_qcom_host *host); static int ufs_qcom_set_dme_vs_core_clk_ctrl_clear_div(struct ufs_hba *hba, u32 clk_cycles); +static struct ufs_qcom_host *rcdev_to_ufs_host(struct reset_controller_dev *rcd) +{ + return container_of(rcd, struct ufs_qcom_host, rcdev); +} + static void ufs_qcom_dump_regs_wrapper(struct ufs_hba *hba, int offset, int len, const char *prefix, void *priv) { @@ -1147,6 +1153,41 @@ static int ufs_qcom_setup_clocks(struct ufs_hba *hba, bool on, return err; } +static int +ufs_qcom_reset_assert(struct reset_controller_dev *rcdev, unsigned long id) +{ + struct ufs_qcom_host *host = rcdev_to_ufs_host(rcdev); + + /* Currently this code only knows about a single reset. */ + WARN_ON(id); + ufs_qcom_assert_reset(host->hba); + /* provide 1ms delay to let the reset pulse propagate. */ + usleep_range(1000, 1100); + return 0; +} + +static int +ufs_qcom_reset_deassert(struct reset_controller_dev *rcdev, unsigned long id) +{ + struct ufs_qcom_host *host = rcdev_to_ufs_host(rcdev); + + /* Currently this code only knows about a single reset. */ + WARN_ON(id); + ufs_qcom_deassert_reset(host->hba); + + /* + * after reset deassertion, phy will need all ref clocks, + * voltage, current to settle down before starting serdes. + */ + usleep_range(1000, 1100); + return 0; +} + +static const struct reset_control_ops ufs_qcom_reset_ops = { + .assert = ufs_qcom_reset_assert, + .deassert = ufs_qcom_reset_deassert, +}; + #define ANDROID_BOOT_DEV_MAX 30 static char android_boot_dev[ANDROID_BOOT_DEV_MAX]; @@ -1191,6 +1232,17 @@ static int ufs_qcom_init(struct ufs_hba *hba) host->hba = hba; ufshcd_set_variant(hba, host); + /* Fire up the reset controller. Failure here is non-fatal. */ + host->rcdev.of_node = dev->of_node; + host->rcdev.ops = &ufs_qcom_reset_ops; + host->rcdev.owner = dev->driver->owner; + host->rcdev.nr_resets = 1; + err = devm_reset_controller_register(dev, &host->rcdev); + if (err) { + dev_warn(dev, "Failed to register reset controller\n"); + err = 0; + } + /* * voting/devoting device ref_clk source is time consuming hence * skip devoting it during aggressive clock gating. This clock diff --git a/drivers/scsi/ufs/ufs-qcom.h b/drivers/scsi/ufs/ufs-qcom.h index c114826316eb..68a880185752 100644 --- a/drivers/scsi/ufs/ufs-qcom.h +++ b/drivers/scsi/ufs/ufs-qcom.h @@ -14,6 +14,8 @@ #ifndef UFS_QCOM_H_ #define UFS_QCOM_H_ +#include + #define MAX_UFS_QCOM_HOSTS 1 #define MAX_U32 (~(u32)0) #define MPHY_TX_FSM_STATE 0x41 @@ -237,6 +239,8 @@ struct ufs_qcom_host { /* Bitmask for enabling debug prints */ u32 dbg_print_en; struct ufs_qcom_testbus testbus; + + struct reset_controller_dev rcdev; }; static inline u32