From mboxrd@z Thu Jan 1 00:00:00 1970 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=-11.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,UNPARSEABLE_RELAY,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 DEA2CC433B4 for ; Wed, 12 May 2021 08:39:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A430F613C8 for ; Wed, 12 May 2021 08:39:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230334AbhELIkh (ORCPT ); Wed, 12 May 2021 04:40:37 -0400 Received: from mailgw02.mediatek.com ([210.61.82.184]:37459 "EHLO mailgw02.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S229968AbhELIkh (ORCPT ); Wed, 12 May 2021 04:40:37 -0400 X-UUID: 66d7e4d7f4984b95bfca9232ce06952e-20210512 X-UUID: 66d7e4d7f4984b95bfca9232ce06952e-20210512 Received: from mtkcas07.mediatek.inc [(172.21.101.84)] by mailgw02.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 1347917821; Wed, 12 May 2021 16:39:25 +0800 Received: from MTKCAS06.mediatek.inc (172.21.101.30) by mtkmbs02n2.mediatek.inc (172.21.101.101) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 12 May 2021 16:39:24 +0800 Received: from mtkswgap22.mediatek.inc (172.21.77.33) by MTKCAS06.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Wed, 12 May 2021 16:39:24 +0800 From: To: , , , , , CC: , , , , , , Subject: scsi: ufs-mediatek: fix ufs power down specs violation Date: Wed, 12 May 2021 16:39:05 +0800 Message-ID: <1620808746-21082-1-git-send-email-peter.wang@mediatek.com> X-Mailer: git-send-email 1.7.9.5 MIME-Version: 1.0 Content-Type: text/plain X-MTK: N Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org As per specs, e.g, JESD220E chapter 7.2, while powering off the ufs device, RST_N signal should be between VSS(Ground) and VCCQ/VCCQ2. The power down sequence after fixing as below: Power down: 1. Assert RST_N low 2. Turn-off VCC 3. Turn-off VCCQ/VCCQ2 drivers/scsi/ufs/ufs-mediatek.c | 4 ++++ 1 file changed, 4 insertions(+)