From patchwork Thu Feb 4 09:45:27 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yaniv Gardi X-Patchwork-Id: 8216071 Return-Path: X-Original-To: patchwork-linux-scsi@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id D403EBEEE5 for ; Thu, 4 Feb 2016 09:47:49 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id EAE5F201D3 for ; Thu, 4 Feb 2016 09:47:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 064B920155 for ; Thu, 4 Feb 2016 09:47:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933517AbcBDJqq (ORCPT ); Thu, 4 Feb 2016 04:46:46 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:49496 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932445AbcBDJqm (ORCPT ); Thu, 4 Feb 2016 04:46:42 -0500 Received: from smtp.codeaurora.org (localhost [127.0.0.1]) by smtp.codeaurora.org (Postfix) with ESMTP id 2C0E2606B0; Thu, 4 Feb 2016 09:46:42 +0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 1F615606A9; Thu, 4 Feb 2016 09:46:42 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Spam-Level: X-Spam-Status: No, score=-7.4 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from lx-ygardi.mea.qualcomm.com (unknown [185.23.60.4]) (using TLSv1.1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: ygardi@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 2A947606A0; Thu, 4 Feb 2016 09:46:37 +0000 (UTC) From: Yaniv Gardi To: robherring2@gmail.com, James.Bottomley@HansenPartnership.com, pebolle@tiscali.nl, hch@infradead.org Cc: linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, linux-arm-msm@vger.kernel.org, santoshsy@gmail.com, linux-scsi-owner@vger.kernel.org, subhashj@codeaurora.org, ygardi@codeaurora.org, Vinayak Holikatti , "James E.J. Bottomley" , "Martin K. Petersen" Subject: [v3 13/14] scsi: ufs: add device quirk delay before putting UFS rails in LPM Date: Thu, 4 Feb 2016 11:45:27 +0200 Message-Id: <1454579128-2682-14-git-send-email-ygardi@codeaurora.org> X-Mailer: git-send-email 1.8.5.2 In-Reply-To: <1454579128-2682-1-git-send-email-ygardi@codeaurora.org> References: <1454579128-2682-1-git-send-email-ygardi@codeaurora.org> X-Virus-Scanned: ClamAV using ClamSMTP 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 We put the UFS device in sleep state & UFS link in hibern8 state during runtime suspaned. After this we put all the UFS rails in low power modes immediately but it seems some devices may still draw more than sleep current from UFS rails (especially from VCCQ rail) atleast for 500us. To avoid this situation, this change adds 2ms delay before putting these UFS rails in LPM mode. Reviewed-by: Gilad Broner Signed-off-by: Subhash Jadavani Signed-off-by: Yaniv Gardi --- drivers/scsi/ufs/ufs_quirks.c | 4 ++++ drivers/scsi/ufs/ufs_quirks.h | 10 +++++++++- drivers/scsi/ufs/ufshcd.c | 10 ++++++++++ 3 files changed, 23 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/ufs/ufs_quirks.c b/drivers/scsi/ufs/ufs_quirks.c index a718c0f..76bd2e4 100644 --- a/drivers/scsi/ufs/ufs_quirks.c +++ b/drivers/scsi/ufs/ufs_quirks.c @@ -16,11 +16,15 @@ static struct ufs_dev_fix ufs_fixups[] = { /* UFS cards deviations table */ + UFS_FIX(UFS_VENDOR_SAMSUNG, UFS_ANY_MODEL, + UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM), UFS_FIX(UFS_VENDOR_SAMSUNG, UFS_ANY_MODEL, UFS_DEVICE_NO_VCCQ), UFS_FIX(UFS_VENDOR_SAMSUNG, UFS_ANY_MODEL, UFS_DEVICE_QUIRK_RECOVERY_FROM_DL_NAC_ERRORS), UFS_FIX(UFS_VENDOR_SAMSUNG, UFS_ANY_MODEL, UFS_DEVICE_NO_FASTAUTO), + UFS_FIX(UFS_VENDOR_TOSHIBA, UFS_ANY_MODEL, + UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM), UFS_FIX(UFS_VENDOR_TOSHIBA, "THGLF2G9C8KBADG", UFS_DEVICE_QUIRK_PA_TACTIVATE), UFS_FIX(UFS_VENDOR_TOSHIBA, "THGLF2G9D8KBADG", diff --git a/drivers/scsi/ufs/ufs_quirks.h b/drivers/scsi/ufs/ufs_quirks.h index b9d99bf..9fbe03c 100644 --- a/drivers/scsi/ufs/ufs_quirks.h +++ b/drivers/scsi/ufs/ufs_quirks.h @@ -18,7 +18,7 @@ /* return true if s1 is a prefix of s2 */ #define STR_PRFX_EQUAL(s1, s2) !strncmp(s1, s2, strlen(s1)) -#define UFS_ANY_VENDOR -1 +#define UFS_ANY_VENDOR 0xFFFF #define UFS_ANY_MODEL "ANY_MODEL" #define MAX_MODEL_LEN 16 @@ -119,6 +119,14 @@ struct ufs_dev_fix { */ #define UFS_DEVICE_NO_FASTAUTO (1 << 5) +/* + * It seems some UFS devices may keep drawing more than sleep current + * (atleast for 500us) from UFS rails (especially from VCCQ rail). + * To avoid this situation, add 2ms delay before putting these UFS + * rails in LPM mode. + */ +#define UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM (1 << 6) + struct ufs_hba; void ufs_advertise_fixup_device(struct ufs_hba *hba); #endif /* UFS_QUIRKS_H_ */ diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index f7a699c2..916cc83 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -5647,6 +5647,16 @@ out: static void ufshcd_vreg_set_lpm(struct ufs_hba *hba) { /* + * It seems some UFS devices may keep drawing more than sleep current + * (atleast for 500us) from UFS rails (especially from VCCQ rail). + * To avoid this situation, add 2ms delay before putting these UFS + * rails in LPM mode. + */ + if (!ufshcd_is_link_active(hba) && + hba->dev_quirks & UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM) + usleep_range(2000, 2100); + + /* * If UFS device is either in UFS_Sleep turn off VCC rail to save some * power. *