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=-11.2 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, NICE_REPLY_A,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=unavailable 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 99268C2D0A3 for ; Wed, 4 Nov 2020 16:35:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5601F206D9 for ; Wed, 4 Nov 2020 16:35:06 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="RP6DDn/d" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729211AbgKDQfF (ORCPT ); Wed, 4 Nov 2020 11:35:05 -0500 Received: from m42-4.mailgun.net ([69.72.42.4]:25458 "EHLO m42-4.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728999AbgKDQfF (ORCPT ); Wed, 4 Nov 2020 11:35:05 -0500 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1604507704; h=Content-Transfer-Encoding: Content-Type: In-Reply-To: MIME-Version: Date: Message-ID: From: References: Cc: To: Subject: Sender; bh=SU4HLVR4/pKEuR98eYnU7WA158OKC9R/E6ZMPClcWT0=; b=RP6DDn/dHHn/VD7CKcbkSDpDrEltMPoEkJoo6V/EJb8QG/1yQPzltFhtQwtdLgi56GUsVBbZ Mk0z9Ul+o4Ygaz3uIZlkYQ0Uzu4Wqg40JuVbb+JNStOebmfSe6Sz0RUTGZlKc2x8zTy13FhN w1V2ufvEn5YOWMHCYdDy99F56BU= X-Mailgun-Sending-Ip: 69.72.42.4 X-Mailgun-Sid: WyI0MWYwYSIsICJsaW51eC1rZXJuZWxAdmdlci5rZXJuZWwub3JnIiwgImJlOWU0YSJd Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n01.prod.us-east-1.postgun.com with SMTP id 5fa2d8360f4c350e07351f0e (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Wed, 04 Nov 2020 16:35:02 GMT Sender: asutoshd=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 08910C433C8; Wed, 4 Nov 2020 16:35:02 +0000 (UTC) Received: from [192.168.8.168] (cpe-70-95-149-85.san.res.rr.com [70.95.149.85]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: asutoshd) by smtp.codeaurora.org (Postfix) with ESMTPSA id D4277C433C6; Wed, 4 Nov 2020 16:35:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org D4277C433C6 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=fail smtp.mailfrom=asutoshd@codeaurora.org Subject: Re: [PATCH V4 2/2] scsi: ufs: Allow an error return value from ->device_reset() To: Adrian Hunter , "Martin K . Petersen" , "James E . J . Bottomley" Cc: linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, Alim Akhtar , Avri Altman , Bean Huo , Can Guo , Stanley Chu References: <20201103141403.2142-1-adrian.hunter@intel.com> <20201103141403.2142-3-adrian.hunter@intel.com> From: "Asutosh Das (asd)" Message-ID: Date: Wed, 4 Nov 2020 08:35:00 -0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.12.1 MIME-Version: 1.0 In-Reply-To: <20201103141403.2142-3-adrian.hunter@intel.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11/3/2020 6:14 AM, Adrian Hunter wrote: > It is simpler for drivers to provide a ->device_reset() callback > irrespective of whether the GPIO, or firmware interface necessary to do the > reset, is discovered during probe. > > Change ->device_reset() to return an error code. Drivers that provide > the callback, but do not do the reset operation should return -EOPNOTSUPP. > > Signed-off-by: Adrian Hunter Reviewed-by: Asutosh Das > --- > drivers/scsi/ufs/ufs-mediatek.c | 4 +++- > drivers/scsi/ufs/ufs-qcom.c | 6 ++++-- > drivers/scsi/ufs/ufshcd.h | 11 +++++++---- > 3 files changed, 14 insertions(+), 7 deletions(-) > > diff --git a/drivers/scsi/ufs/ufs-mediatek.c b/drivers/scsi/ufs/ufs-mediatek.c > index 8df73bc2f8cb..914a827a93ee 100644 > --- a/drivers/scsi/ufs/ufs-mediatek.c > +++ b/drivers/scsi/ufs/ufs-mediatek.c > @@ -743,7 +743,7 @@ static int ufs_mtk_link_startup_notify(struct ufs_hba *hba, > return ret; > } > > -static void ufs_mtk_device_reset(struct ufs_hba *hba) > +static int ufs_mtk_device_reset(struct ufs_hba *hba) > { > struct arm_smccc_res res; > > @@ -764,6 +764,8 @@ static void ufs_mtk_device_reset(struct ufs_hba *hba) > usleep_range(10000, 15000); > > dev_info(hba->dev, "device reset done\n"); > + > + return 0; > } > > static int ufs_mtk_link_set_hpm(struct ufs_hba *hba) > diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c > index 9a19c6d15d3b..357c3b49321d 100644 > --- a/drivers/scsi/ufs/ufs-qcom.c > +++ b/drivers/scsi/ufs/ufs-qcom.c > @@ -1422,13 +1422,13 @@ static void ufs_qcom_dump_dbg_regs(struct ufs_hba *hba) > * > * Toggles the (optional) reset line to reset the attached device. > */ > -static void ufs_qcom_device_reset(struct ufs_hba *hba) > +static int ufs_qcom_device_reset(struct ufs_hba *hba) > { > struct ufs_qcom_host *host = ufshcd_get_variant(hba); > > /* reset gpio is optional */ > if (!host->device_reset) > - return; > + return -EOPNOTSUPP; > > /* > * The UFS device shall detect reset pulses of 1us, sleep for 10us to > @@ -1439,6 +1439,8 @@ static void ufs_qcom_device_reset(struct ufs_hba *hba) > > gpiod_set_value_cansleep(host->device_reset, 0); > usleep_range(10, 15); > + > + return 0; > } > > #if IS_ENABLED(CONFIG_DEVFREQ_GOV_SIMPLE_ONDEMAND) > diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h > index 213be0667b59..5191d87f6263 100644 > --- a/drivers/scsi/ufs/ufshcd.h > +++ b/drivers/scsi/ufs/ufshcd.h > @@ -323,7 +323,7 @@ struct ufs_hba_variant_ops { > int (*resume)(struct ufs_hba *, enum ufs_pm_op); > void (*dbg_register_dump)(struct ufs_hba *hba); > int (*phy_initialization)(struct ufs_hba *); > - void (*device_reset)(struct ufs_hba *hba); > + int (*device_reset)(struct ufs_hba *hba); > void (*config_scaling_param)(struct ufs_hba *hba, > struct devfreq_dev_profile *profile, > void *data); > @@ -1207,9 +1207,12 @@ static inline void ufshcd_vops_dbg_register_dump(struct ufs_hba *hba) > static inline void ufshcd_vops_device_reset(struct ufs_hba *hba) > { > if (hba->vops && hba->vops->device_reset) { > - hba->vops->device_reset(hba); > - ufshcd_set_ufs_dev_active(hba); > - ufshcd_update_reg_hist(&hba->ufs_stats.dev_reset, 0); > + int err = hba->vops->device_reset(hba); > + > + if (!err) > + ufshcd_set_ufs_dev_active(hba); > + if (err != -EOPNOTSUPP) > + ufshcd_update_reg_hist(&hba->ufs_stats.dev_reset, err); > } > } > > -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, Linux Foundation Collaborative Project