From patchwork Wed Mar 18 10:40:12 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stanley Chu X-Patchwork-Id: 11444887 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C3FE792A for ; Wed, 18 Mar 2020 10:40:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A28BF20771 for ; Wed, 18 Mar 2020 10:40:47 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=mediatek.com header.i=@mediatek.com header.b="hnwE2MXA" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727811AbgCRKko (ORCPT ); Wed, 18 Mar 2020 06:40:44 -0400 Received: from mailgw01.mediatek.com ([210.61.82.183]:42689 "EHLO mailgw01.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1727702AbgCRKk3 (ORCPT ); Wed, 18 Mar 2020 06:40:29 -0400 X-UUID: 902edc92533d4cdaa10ccfb312d2a90f-20200318 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Transfer-Encoding:Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:CC:To:From; bh=SujIfavt6nl6SADi9CBMgGUh+AUKfIUyar7ayBhr5XY=; b=hnwE2MXA4UEfCRWY13D2cI0XA8YR/yu3/Qrec5wkIN5G/3maN7eCirSbCIcnWppA2VXR1z0c1j5CbIWddRXHhrh1Ca2s5uqOskeka0izJ93QFtcVebH3l6qdDtWHwNyYY5+mqwRvD7uXhXvFsMSpXSdXblKsREMcgmb3gfRsuBc=; X-UUID: 902edc92533d4cdaa10ccfb312d2a90f-20200318 Received: from mtkexhb02.mediatek.inc [(172.21.101.103)] by mailgw01.mediatek.com (envelope-from ) (Cellopoint E-mail Firewall v4.1.10 Build 0809 with TLS) with ESMTP id 1482939392; Wed, 18 Mar 2020 18:40:20 +0800 Received: from mtkcas07.mediatek.inc (172.21.101.84) by mtkmbs05n1.mediatek.inc (172.21.101.15) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Wed, 18 Mar 2020 18:39:00 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkcas07.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1395.4 via Frontend Transport; Wed, 18 Mar 2020 18:40:30 +0800 From: Stanley Chu To: , , , , , CC: , , , , , , , , , , , Stanley Chu Subject: [PATCH v7 3/7] scsi: ufs: introduce common and flexible delay function Date: Wed, 18 Mar 2020 18:40:12 +0800 Message-ID: <20200318104016.28049-4-stanley.chu@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20200318104016.28049-1-stanley.chu@mediatek.com> References: <20200318104016.28049-1-stanley.chu@mediatek.com> MIME-Version: 1.0 X-MTK: N Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Introduce a common delay function to provide flexible way for users to take choices of udelay and usleep_range into consideration according to the required delay time. Signed-off-by: Stanley Chu Reviewed-by: Avri Altman Reviewed-by: Can Guo --- drivers/scsi/ufs/ufshcd.c | 12 ++++++++++++ drivers/scsi/ufs/ufshcd.h | 1 + 2 files changed, 13 insertions(+) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 314e808b0d4e..a42a84164dec 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -597,6 +597,18 @@ static void ufshcd_print_pwr_info(struct ufs_hba *hba) hba->pwr_info.hs_rate); } +void ufshcd_delay_us(unsigned long us, unsigned long tolerance) +{ + if (!us) + return; + + if (us < 10) + udelay(us); + else + usleep_range(us, us + tolerance); +} +EXPORT_SYMBOL_GPL(ufshcd_delay_us); + /* * ufshcd_wait_for_register - wait for register value to change * @hba - per-adapter interface diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index 52425371082a..9a14ff3d5f8b 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -792,6 +792,7 @@ int ufshcd_init(struct ufs_hba * , void __iomem * , unsigned int); int ufshcd_make_hba_operational(struct ufs_hba *hba); void ufshcd_remove(struct ufs_hba *); int ufshcd_uic_hibern8_exit(struct ufs_hba *hba); +void ufshcd_delay_us(unsigned long us, unsigned long tolerance); int ufshcd_wait_for_register(struct ufs_hba *hba, u32 reg, u32 mask, u32 val, unsigned long interval_us, unsigned long timeout_ms, bool can_sleep);