From patchwork Wed Jun 2 02:42:00 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?UGV0ZXIgV2FuZyAo546L5L+h5Y+LKQ==?= X-Patchwork-Id: 12292709 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id F3F34C47080 for ; Wed, 2 Jun 2021 02:42:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D36BF613BE for ; Wed, 2 Jun 2021 02:42:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230192AbhFBCnw (ORCPT ); Tue, 1 Jun 2021 22:43:52 -0400 Received: from mailgw01.mediatek.com ([210.61.82.183]:37773 "EHLO mailgw01.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S229866AbhFBCnv (ORCPT ); Tue, 1 Jun 2021 22:43:51 -0400 X-UUID: 7da65158d68747b3bfeb58c20835819a-20210602 X-UUID: 7da65158d68747b3bfeb58c20835819a-20210602 Received: from mtkexhb02.mediatek.inc [(172.21.101.103)] by mailgw01.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 2025862411; Wed, 02 Jun 2021 10:42:07 +0800 Received: from mtkcas07.mediatek.inc (172.21.101.84) by mtkmbs02n1.mediatek.inc (172.21.101.77) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 2 Jun 2021 10:42:05 +0800 Received: from mtkswgap22.mediatek.inc (172.21.77.33) by mtkcas07.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Wed, 2 Jun 2021 10:42:05 +0800 From: To: , , , , , CC: , , , , , , , Subject: [PATCH v2] scsi: ufs-mediatek: create device link of reset control Date: Wed, 2 Jun 2021 10:42:00 +0800 Message-ID: <1622601720-22466-1-git-send-email-peter.wang@mediatek.com> X-Mailer: git-send-email 1.7.9.5 MIME-Version: 1.0 X-MTK: N Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Peter Wang Mediatek UFS reset function is relied on Reset Control provided by reset-ti-syscon. To make Reset Control work properly, select reset-ti-syscon to ensure it being built with ufs-mediatek together. In addition, establish device link to wait until reset-ti-syscon initialization is done during UFS probing flow. Signed-off-by: Peter Wang Reviewed-by: Stanley Chu --- drivers/scsi/ufs/Kconfig | 1 + drivers/scsi/ufs/ufs-mediatek.c | 29 +++++++++++++++++++++++++++++ 2 files changed, 30 insertions(+) diff --git a/drivers/scsi/ufs/Kconfig b/drivers/scsi/ufs/Kconfig index 07cf415..2d13795 100644 --- a/drivers/scsi/ufs/Kconfig +++ b/drivers/scsi/ufs/Kconfig @@ -115,6 +115,7 @@ config SCSI_UFS_MEDIATEK tristate "Mediatek specific hooks to UFS controller platform driver" depends on SCSI_UFSHCD_PLATFORM && ARCH_MEDIATEK select PHY_MTK_UFS + select RESET_TI_SYSCON help This selects the Mediatek specific additions to UFSHCD platform driver. UFS host on Mediatek needs some vendor specific configuration before diff --git a/drivers/scsi/ufs/ufs-mediatek.c b/drivers/scsi/ufs/ufs-mediatek.c index a981f26..d27e65e 100644 --- a/drivers/scsi/ufs/ufs-mediatek.c +++ b/drivers/scsi/ufs/ufs-mediatek.c @@ -1067,9 +1067,38 @@ static int ufs_mtk_probe(struct platform_device *pdev) { int err; struct device *dev = &pdev->dev; + struct device_node *reset_node; + struct platform_device *reset_pdev; + struct device_link *link; + + reset_node = of_find_compatible_node(NULL, NULL, + "ti,syscon-reset"); + if (!reset_node) { + dev_notice(dev, "find ti,syscon-reset fail\n"); + goto skip_reset; + } + reset_pdev = of_find_device_by_node(reset_node); + if (!reset_pdev) { + dev_notice(dev, "find reset_pdev fail\n"); + goto skip_reset; + } + link = device_link_add(dev, &reset_pdev->dev, + DL_FLAG_AUTOPROBE_CONSUMER); + if (!link) { + dev_notice(dev, "add reset device_link fail\n"); + goto skip_reset; + } + /* supplier is not probed */ + if (link->status == DL_STATE_DORMANT) { + err = -EPROBE_DEFER; + goto out; + } +skip_reset: /* perform generic probe */ err = ufshcd_pltfrm_init(pdev, &ufs_hba_mtk_vops); + +out: if (err) dev_info(dev, "probe failed %d\n", err);