From patchwork Thu May 3 10:35:24 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Asutosh Das (asd)" X-Patchwork-Id: 10377723 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 0897360353 for ; Thu, 3 May 2018 10:42:04 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0DCF728F24 for ; Thu, 3 May 2018 10:42:04 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 029BF28F2A; Thu, 3 May 2018 10:42:03 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9011B28F29 for ; Thu, 3 May 2018 10:42:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751818AbeECKmB (ORCPT ); Thu, 3 May 2018 06:42:01 -0400 Received: from alexa-out-tai-01.qualcomm.com ([103.229.16.226]:41384 "EHLO alexa-out-tai-01.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751737AbeECKl7 (ORCPT ); Thu, 3 May 2018 06:41:59 -0400 X-IronPort-AV: E=Sophos;i="5.49,358,1520870400"; d="scan'208";a="443494" Received: from ironmsg02-tai.qualcomm.com ([10.249.140.7]) by alexa-out-tai-01.qualcomm.com with ESMTP; 03 May 2018 18:35:37 +0800 X-IronPort-AV: E=McAfee;i="5900,7806,8881"; a="7388590" Received: from asutoshd-linux.qualcomm.com ([10.206.24.163]) by ironmsg02-tai.qualcomm.com with ESMTP; 03 May 2018 18:35:32 +0800 Received: by asutoshd-linux.qualcomm.com (Postfix, from userid 92687) id ADAC62E88; Thu, 3 May 2018 16:05:31 +0530 (IST) From: Asutosh Das To: asutoshd@qti.qualcomm.com, linux-mmc@vger.kernel.org Subject: [PATCH v2 03/10] scsi: ufs: Add LCC quirk for host and device Date: Thu, 3 May 2018 16:05:24 +0530 Message-Id: <0aa7ff1ff67e0c01d6347b932cfe7ce801ef09fc.1525343531.git.asutoshd@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: References: In-Reply-To: References: Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP LCC (Line Control Command) is being used for communication between UFS host and UFS device. But some hosts might have the issue with issuing the LCC commands to UFS device and in this case LCC could be explicitly disabled. But there could be a need where we don't want to disable the LCC on both host & device; hence this change splits the quirk in 2 parts one for host and one for device. Signed-off-by: Subhash Jadavani Signed-off-by: Venkat Gopalakrishnan Signed-off-by: Can Guo Signed-off-by: Asutosh Das --- drivers/scsi/ufs/ufshcd.c | 16 ++++++++++++++++ drivers/scsi/ufs/ufshcd.h | 12 ++++++++++++ 2 files changed, 28 insertions(+) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index f3083fe..6dabce8 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -4116,6 +4116,11 @@ static int ufshcd_disable_tx_lcc(struct ufs_hba *hba, bool peer) return err; } +static inline int ufshcd_disable_host_tx_lcc(struct ufs_hba *hba) +{ + return ufshcd_disable_tx_lcc(hba, false); +} + static inline int ufshcd_disable_device_tx_lcc(struct ufs_hba *hba) { return ufshcd_disable_tx_lcc(hba, true); @@ -4172,6 +4177,17 @@ static int ufshcd_link_startup(struct ufs_hba *hba) ufshcd_dme_set(hba, UIC_ARG_MIB(TX_LCC_ENABLE), 1); } + if (hba->quirks & UFSHCD_BROKEN_LCC_PROCESSING_ON_HOST) { + ret = ufshcd_disable_device_tx_lcc(hba); + if (ret) + goto out; + } + + if (hba->quirks & UFSHCD_BROKEN_LCC_PROCESSING_ON_DEVICE) { + ret = ufshcd_disable_host_tx_lcc(hba); + if (ret) + goto out; + } if (link_startup_again) { link_startup_again = false; retries = DME_LINKSTARTUP_RETRIES; diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index bb4ecfb..0417c42 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -598,6 +598,18 @@ struct ufs_hba { * TX_LCC. */ #define UFSHCD_QUIRK_BROKEN_PWR_MODE_CHANGE UFS_BIT(8) + + /* + * If UFS device is having issue in processing LCC (Line Control + * Command) coming from UFS host controller then enable this quirk. + * When this quirk is enabled, host controller driver should disable + * the LCC transmission on UFS host controller (by clearing + * TX_LCC_ENABLE attribute of host to 0). + */ + #define UFSHCD_BROKEN_LCC_PROCESSING_ON_DEVICE 0x100 + + #define UFSHCD_BROKEN_LCC_PROCESSING_ON_HOST 0x200 + unsigned int quirks; /* Deviations from standard UFSHCI spec. */ /* Device deviations from standard UFS device spec. */