From patchwork Wed Oct 23 04:13:28 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Can Guo X-Patchwork-Id: 11205657 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 792DB139A for ; Wed, 23 Oct 2019 04:14:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4D7302173B for ; Wed, 23 Oct 2019 04:14:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="FZNzxAyu"; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="X27rt2T7" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731656AbfJWENz (ORCPT ); Wed, 23 Oct 2019 00:13:55 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:41930 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726283AbfJWENz (ORCPT ); Wed, 23 Oct 2019 00:13:55 -0400 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 3B65A60AA8; Wed, 23 Oct 2019 04:13:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1571804034; bh=bIqfUq8Cj92dVeLxzswjGAmf6yE3hjGEGDCaYQ/HP8M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FZNzxAyufhig1XGtKTvWtJUk3zJrcXbqphX91+BY/WGdU8KOLD4JYyMA42fCinisg +JUPDyHnu8gZF+ztiwG44nRXPoPMZaO+4tpQbqOa1O9/Hltn7g7G4SperO1985Ztci C1NBn7CGowWhj2EKxCeRGmxN1KAxmN507BYYroh0= X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on pdx-caf-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.7 required=2.0 tests=ALL_TRUSTED,BAYES_00, DKIM_INVALID,DKIM_SIGNED,SPF_NONE autolearn=no autolearn_force=no version=3.4.0 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 C8F0260A66; Wed, 23 Oct 2019 04:13:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1571804033; bh=bIqfUq8Cj92dVeLxzswjGAmf6yE3hjGEGDCaYQ/HP8M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=X27rt2T7n4f9qfTki59F32SVFZtliV5rFn+2Vix6qEf6qZYMgdTG5fGd1hSFOUGpc ASZCu6Sx1GovWZgiFG7Hn9CvbA2sc54OHFlFE8n3HIrg83q7grK1n/AqAKSlgUxIww SGK0Lzc4YSeT4dTlBA0QZpVlBC+uZBKts4Ode2yk= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org C8F0260A66 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: asutoshd@codeaurora.org, nguyenb@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 , Alim Akhtar , Avri Altman , Pedro Sousa , "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 v1 2/2] scsi: ufs-qcom: Add reset control support for host controller Date: Tue, 22 Oct 2019 21:13:28 -0700 Message-Id: <1571804009-29787-3-git-send-email-cang@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1571804009-29787-1-git-send-email-cang@codeaurora.org> References: <1571804009-29787-1-git-send-email-cang@codeaurora.org> Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Add reset control for host controller and provide it through vops to UFS core driver. Signed-off-by: Can Guo --- drivers/scsi/ufs/ufs-qcom.c | 43 +++++++++++++++++++++++++++++++++++++++++++ drivers/scsi/ufs/ufs-qcom.h | 3 +++ 2 files changed, 46 insertions(+) diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c index a5b7148..3dee906 100644 --- a/drivers/scsi/ufs/ufs-qcom.c +++ b/drivers/scsi/ufs/ufs-qcom.c @@ -576,6 +576,39 @@ static int ufs_qcom_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op) return 0; } +static int ufs_qcom_full_reset(struct ufs_hba *hba) +{ + int ret = -ENOTSUPP; + struct ufs_qcom_host *host = ufshcd_get_variant(hba); + + if (!host->core_reset) { + dev_warn(hba->dev, "%s: failed, err = %d\n", __func__, ret); + goto out; + } + + ret = reset_control_assert(host->core_reset); + if (ret) { + dev_err(hba->dev, "%s: core_reset assert failed, err = %d\n", + __func__, ret); + goto out; + } + + /* + * The hardware requirement for delay between assert/deassert + * is at least 3-4 sleep clock (32.7KHz) cycles, which comes to + * ~125us (4/32768). To be on the safe side add 200us delay. + */ + usleep_range(200, 210); + + ret = reset_control_deassert(host->core_reset); + if (ret) + dev_err(hba->dev, "%s: core_reset deassert failed, err = %d\n", + __func__, ret); + +out: + return ret; +} + #ifdef CONFIG_MSM_BUS_SCALING static int ufs_qcom_get_bus_vote(struct ufs_qcom_host *host, const char *speed_mode) @@ -1101,6 +1134,15 @@ static int ufs_qcom_init(struct ufs_hba *hba) host->hba = hba; ufshcd_set_variant(hba, host); + /* Setup the reset control of HCI */ + host->core_reset = devm_reset_control_get(hba->dev, "rst"); + if (IS_ERR(host->core_reset)) { + err = PTR_ERR(host->core_reset); + dev_warn(dev, "Failed to get reset control %d\n", err); + host->core_reset = NULL; + err = 0; + } + /* Fire up the reset controller. Failure here is non-fatal. */ host->rcdev.of_node = dev->of_node; host->rcdev.ops = &ufs_qcom_reset_ops; @@ -1596,6 +1638,7 @@ static void ufs_qcom_device_reset(struct ufs_hba *hba) .apply_dev_quirks = ufs_qcom_apply_dev_quirks, .suspend = ufs_qcom_suspend, .resume = ufs_qcom_resume, + .full_reset = ufs_qcom_full_reset, .dbg_register_dump = ufs_qcom_dump_dbg_regs, .device_reset = ufs_qcom_device_reset, }; diff --git a/drivers/scsi/ufs/ufs-qcom.h b/drivers/scsi/ufs/ufs-qcom.h index d401f17..2d95e7c 100644 --- a/drivers/scsi/ufs/ufs-qcom.h +++ b/drivers/scsi/ufs/ufs-qcom.h @@ -6,6 +6,7 @@ #define UFS_QCOM_H_ #include +#include #define MAX_UFS_QCOM_HOSTS 1 #define MAX_U32 (~(u32)0) @@ -233,6 +234,8 @@ struct ufs_qcom_host { u32 dbg_print_en; struct ufs_qcom_testbus testbus; + /* Reset control of HCI */ + struct reset_control *core_reset; struct reset_controller_dev rcdev; struct gpio_desc *device_reset;