From patchwork Mon Dec 9 08:29:14 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stanley Chu X-Patchwork-Id: 11278581 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 D575714B7 for ; Mon, 9 Dec 2019 08:29:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B3D8E20726 for ; Mon, 9 Dec 2019 08:29:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=mediatek.com header.i=@mediatek.com header.b="JJ+JXQZh" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727188AbfLII3Z (ORCPT ); Mon, 9 Dec 2019 03:29:25 -0500 Received: from mailgw01.mediatek.com ([210.61.82.183]:26427 "EHLO mailgw01.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1727044AbfLII3Z (ORCPT ); Mon, 9 Dec 2019 03:29:25 -0500 X-UUID: ac42b9fa683e41efaf49f0db4b7012f4-20191209 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Transfer-Encoding:Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:CC:To:From; bh=FsOPpGNcvyN3hqCpKWKad5Cxcn0GwUWSQI3FseIG2Rg=; b=JJ+JXQZhVK2zvQGAqUuXloTBIHvnoLksjCyLgRgouq0Uif5uTIfVV9NwyVSv4mjvLPGrrEvtygZHfCvrr1o3b1B8KnuFICqOSMO/RJLPZqXx7tUrgKgKuBEdWKHGQx8oVTmvfvvmm+wS/IvlUtRWYGO3a3Skhut3fq80GaFBnAI=; X-UUID: ac42b9fa683e41efaf49f0db4b7012f4-20191209 Received: from mtkmrs01.mediatek.inc [(172.21.131.159)] by mailgw01.mediatek.com (envelope-from ) (Cellopoint E-mail Firewall v4.1.10 Build 0809 with TLS) with ESMTP id 2035563348; Mon, 09 Dec 2019 16:29:17 +0800 Received: from mtkcas08.mediatek.inc (172.21.101.126) by mtkmbs05n1.mediatek.inc (172.21.101.15) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Mon, 9 Dec 2019 16:28:55 +0800 Received: from mtkswgap22.mediatek.inc (172.21.77.33) by mtkcas08.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1395.4 via Frontend Transport; Mon, 9 Dec 2019 16:29:01 +0800 From: Stanley Chu To: , , , , , , , CC: , , , , , , , , , Stanley Chu Subject: [PATCH v2 2/2] scsi: ufs-mediatek: add device reset implementation Date: Mon, 9 Dec 2019 16:29:14 +0800 Message-ID: <1575880154-6099-3-git-send-email-stanley.chu@mediatek.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1575880154-6099-1-git-send-email-stanley.chu@mediatek.com> References: <1575880154-6099-1-git-send-email-stanley.chu@mediatek.com> MIME-Version: 1.0 X-MTK: N Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Add device reset vops implementation in MediaTek UFS driver. Signed-off-by: Stanley Chu Reviewed-by: Avri Altman --- drivers/scsi/ufs/ufs-mediatek.c | 27 +++++++++++++++++++++++++++ drivers/scsi/ufs/ufs-mediatek.h | 7 +++++++ 2 files changed, 34 insertions(+) diff --git a/drivers/scsi/ufs/ufs-mediatek.c b/drivers/scsi/ufs/ufs-mediatek.c index 83e28edc3ac5..6a3ec11b16db 100644 --- a/drivers/scsi/ufs/ufs-mediatek.c +++ b/drivers/scsi/ufs/ufs-mediatek.c @@ -6,10 +6,12 @@ * Peter Wang */ +#include #include #include #include #include +#include #include "ufshcd.h" #include "ufshcd-pltfrm.h" @@ -269,6 +271,30 @@ static int ufs_mtk_link_startup_notify(struct ufs_hba *hba, return ret; } +static void ufs_mtk_device_reset(struct ufs_hba *hba) +{ + struct arm_smccc_res res; + + arm_smccc_smc(MTK_SIP_UFS_CONTROL, UFS_MTK_SIP_DEVICE_RESET, + 0, 0, 0, 0, 0, 0, &res); + /* + * The reset signal is active low. UFS devices shall detect + * more than or equal to 1us of positive or negative RST_n + * pulse width. + * + * To be on safe side, keep the reset low for at least 10us. + */ + usleep_range(10, 15); + + arm_smccc_smc(MTK_SIP_UFS_CONTROL, UFS_MTK_SIP_DEVICE_RESET, + 1, 0, 0, 0, 0, 0, &res); + + /* Some devices may need time to respond to rst_n */ + usleep_range(10000, 15000); + + dev_info(hba->dev, "device reset done\n"); +} + static int ufs_mtk_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op) { struct ufs_mtk_host *host = ufshcd_get_variant(hba); @@ -303,6 +329,7 @@ static struct ufs_hba_variant_ops ufs_hba_mtk_vops = { .pwr_change_notify = ufs_mtk_pwr_change_notify, .suspend = ufs_mtk_suspend, .resume = ufs_mtk_resume, + .device_reset = ufs_mtk_device_reset, }; /** diff --git a/drivers/scsi/ufs/ufs-mediatek.h b/drivers/scsi/ufs/ufs-mediatek.h index 19f8c42fe06f..b03f601d3a9e 100644 --- a/drivers/scsi/ufs/ufs-mediatek.h +++ b/drivers/scsi/ufs/ufs-mediatek.h @@ -6,6 +6,8 @@ #ifndef _UFS_MEDIATEK_H #define _UFS_MEDIATEK_H +#include + /* * Vendor specific pre-defined parameters */ @@ -29,6 +31,11 @@ #define VS_SAVEPOWERCONTROL 0xD0A6 #define VS_UNIPROPOWERDOWNCONTROL 0xD0A8 +/* + * SiP commands + */ +#define UFS_MTK_SIP_DEVICE_RESET BIT(1) + /* * VS_DEBUGCLOCKENABLE */