From patchwork Wed Mar 18 10:40:15 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stanley Chu X-Patchwork-Id: 11444891 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 B26E36CA for ; Wed, 18 Mar 2020 10:40:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 921732077A for ; Wed, 18 Mar 2020 10:40:50 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=mediatek.com header.i=@mediatek.com header.b="k09ThN1C" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727733AbgCRKk1 (ORCPT ); Wed, 18 Mar 2020 06:40:27 -0400 Received: from mailgw02.mediatek.com ([210.61.82.184]:9266 "EHLO mailgw02.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1727594AbgCRKk1 (ORCPT ); Wed, 18 Mar 2020 06:40:27 -0400 X-UUID: 73f1d53a91be44aba7e3f3c92256d060-20200318 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=l43Y70kKFAGzTa2uG8nek85a7oOhGxZciCH5vTIHDnc=; b=k09ThN1CtOphyopAWLDJV+rPnRSJNOh5E9mOuqTJ7s75Q0dj2yF09KdbFWi0ODeCDSmx21LNBhxFn3D7RDoMuqGoSkSw9WsQNB2035yfoymFmVcCJs9Gse2S0tkl5XUR/Ggyn31OSudoU/qhmBq5VIpIXOJEFv0bfEwPZSvDY3w=; X-UUID: 73f1d53a91be44aba7e3f3c92256d060-20200318 Received: from mtkexhb01.mediatek.inc [(172.21.101.102)] by mailgw02.mediatek.com (envelope-from ) (Cellopoint E-mail Firewall v4.1.10 Build 0809 with TLS) with ESMTP id 473040055; Wed, 18 Mar 2020 18:40:22 +0800 Received: from mtkcas07.mediatek.inc (172.21.101.84) by mtkmbs02n2.mediatek.inc (172.21.101.101) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Wed, 18 Mar 2020 18:37:26 +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 18:40:31 +0800 From: Stanley Chu To: , , , , , CC: , , , , , , , , , , , Stanley Chu Subject: [PATCH v7 6/7] scsi: ufs: make HCE polling more compact to improve initialization latency Date: Wed, 18 Mar 2020 18:40:15 +0800 Message-ID: <20200318104016.28049-7-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-TM-SNTS-SMTP: D8C3168073D3976E2DBE66C8C4D3BE939EBB80A91E0D434189AC87BE58D182902000:8 X-MTK: N Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Reduce the waiting period between each HCE (Host Controller Enable) polling from 5 ms to 1 ms. In the same time, increase the maximum polling times to make "total polling time" unchanged approximately. This change could make HCE initializatoin faster to improve latency of ufshcd initialization, error recovery, and resume behaviors. Signed-off-by: Stanley Chu Reviewed-by: Avri Altman Reviewed-by: Can Guo --- drivers/scsi/ufs/ufshcd.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index c5ee77a5bfc7..8edb91b19c33 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -4304,7 +4304,7 @@ int ufshcd_hba_enable(struct ufs_hba *hba) ufshcd_delay_us(hba->hba_enable_delay_us, 100); /* wait for the host controller to complete initialization */ - retry = 10; + retry = 50; while (ufshcd_is_hba_active(hba)) { if (retry) { retry--; @@ -4313,7 +4313,7 @@ int ufshcd_hba_enable(struct ufs_hba *hba) "Controller enable failed\n"); return -EIO; } - usleep_range(5000, 5100); + usleep_range(1000, 1100); } /* enable UIC related interrupts */