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=-4.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY autolearn=no 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 9E77BC433E6 for ; Wed, 2 Sep 2020 01:20:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5E0E120707 for ; Wed, 2 Sep 2020 01:20:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="XwWeBzx0" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726140AbgIBBUp (ORCPT ); Tue, 1 Sep 2020 21:20:45 -0400 Received: from aserp2120.oracle.com ([141.146.126.78]:37320 "EHLO aserp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726107AbgIBBUp (ORCPT ); Tue, 1 Sep 2020 21:20:45 -0400 Received: from pps.filterd (aserp2120.oracle.com [127.0.0.1]) by aserp2120.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 0821K9ZG147903; Wed, 2 Sep 2020 01:20:40 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=to : cc : subject : from : message-id : references : date : in-reply-to : mime-version : content-type; s=corp-2020-01-29; bh=6Ix/wFPP3jGYKh2npUpM7gRAU5rDqRb638VaJZQP+Lc=; b=XwWeBzx0nPtmsWrDZiALcCEOCupiGaZVGq4lwIBL7RGCaMUnlDQ96p72iKxiPNvrpOeN Fes2BAQRSbgFl60BKAV4KOw5VgSd3Z1P3q0KdfB0LDLKm+YwlsgyOZPxU7CCIawDv59K 81Ff9gO5wl5UDc2MlD5epKqq/jdkBpJkXfHKRcJYadHxrICxxzum7HOKhXY81QuF6a/y WEI0kzH1FZVi7ILoxcVbHSnVttPEAKlrxeDfaZnKXGOSRWbrD/zAdVrQKtVdanFsMbIS H9UWrGovEcgwJ5K3PBu9cXEG2wnR3rtmQOZ0lYSWbApp2kZnofAZ303HgYlLzAXM72jU Ww== Received: from userp3030.oracle.com (userp3030.oracle.com [156.151.31.80]) by aserp2120.oracle.com with ESMTP id 337eym7jja-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Wed, 02 Sep 2020 01:20:40 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 0821Jhq6126284; Wed, 2 Sep 2020 01:20:39 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by userp3030.oracle.com with ESMTP id 3380xxkr73-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 02 Sep 2020 01:20:39 +0000 Received: from abhmp0010.oracle.com (abhmp0010.oracle.com [141.146.116.16]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 0821KcQn029208; Wed, 2 Sep 2020 01:20:38 GMT Received: from ca-mkp.ca.oracle.com (/10.159.214.123) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Tue, 01 Sep 2020 18:20:37 -0700 To: Viswas G Cc: , , , , , , , , , , Subject: Re: [PATCH v8 2/2] pm80xx : Staggered spin up support. From: "Martin K. Petersen" Organization: Oracle Corporation Message-ID: References: <20200820185123.27354-1-Viswas.G@microchip.com.com> <20200820185123.27354-3-Viswas.G@microchip.com.com> Date: Tue, 01 Sep 2020 21:20:34 -0400 In-Reply-To: <20200820185123.27354-3-Viswas.G@microchip.com.com> (Viswas G.'s message of "Fri, 21 Aug 2020 00:21:23 +0530") MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9731 signatures=668679 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 adultscore=0 phishscore=0 malwarescore=0 bulkscore=0 mlxscore=0 mlxlogscore=999 suspectscore=1 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009020009 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9731 signatures=668679 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=1 adultscore=0 priorityscore=1501 phishscore=0 mlxlogscore=999 mlxscore=0 lowpriorityscore=0 clxscore=1011 spamscore=0 bulkscore=0 impostorscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009020009 Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Viswas, > As a part of drive discovery, driver will initaite the drive spin up. > If all drives do spin up together, it will result in large power > consumption. To reduce the power consumption, driver provide an option > to make a small group of drives (say 3 or 4 drives together) to do the > spin up. The delay between two spin up group and no of drives to spin > up (group) can be programmed by the customer in seeprom and driver > will use it to control the spinup. Please implement this in libsas as several people have suggested. Thanks! -- Martin K. Petersen Oracle Linux Engineering