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=-11.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,T_DKIMWL_WL_HIGH,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 64B3FC04AB6 for ; Mon, 3 Jun 2019 08:05:45 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 3AE8A24A87 for ; Mon, 3 Jun 2019 08:05:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="F8P1/WoX" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3AE8A24A87 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=bootlin.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=Sw8BkyFY6BhXY0+87ErVU2WCL1tOyL/7nWxdwoYCi3I=; b=F8P1/WoXlbEjva HU2cZfhG78mr3wM3Qb7preXoxuuXVBcR0wYN/ClqC79jCRZfNrOTiv+wKVnYS1+HrRGEFXn5xwpZa U2kycd5OWPAeKkk86NbJUteWaeZ77zgXnxXdpRBXV06g1S7ay36cOB46wGwyn7m7ZjgAiUcOAOsRe le3pN9TeS0T+DpavIvp+kZWv5/ysyjIftct0fZWeNXA25tOL4LCgDNrM6cpzpy6t0uyM3BlChAjs0 jCUdyOk+oBzXF64nrz37eSb0rWDO68qn1UEn9pKar2FQVRrIwx9GqftmrbuJUDR3GGZNa20FUfesP vkjLkyTVSF6vZY5D17cQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hXhyP-0003F9-SG; Mon, 03 Jun 2019 08:05:41 +0000 Received: from relay9-d.mail.gandi.net ([217.70.183.199]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1hXhxa-0000wS-Pf; Mon, 03 Jun 2019 08:05:28 +0000 X-Originating-IP: 90.88.144.139 Received: from localhost.localdomain (aaubervilliers-681-1-24-139.w90-88.abo.wanadoo.fr [90.88.144.139]) (Authenticated sender: miquel.raynal@bootlin.com) by relay9-d.mail.gandi.net (Postfix) with ESMTPSA id D7F63FF81A; Mon, 3 Jun 2019 08:04:47 +0000 (UTC) From: Miquel Raynal To: Xiaolei Li , miquel.raynal@bootlin.com, richard@nod.at Subject: Re: [PATCH v3 2/4] mtd: rawnand: mtk: Improve data sampling timing for read cycle Date: Mon, 3 Jun 2019 10:04:46 +0200 Message-Id: <20190603080446.28858-1-miquel.raynal@bootlin.com> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190507102541.34341-3-xiaolei.li@mediatek.com> References: MIME-Version: 1.0 X-linux-mtd-patch-notification: thanks X-linux-mtd-patch-commit: 30d9247b69fce5fbeaec67c3401cfa9a848a7d33 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190603_010451_780763_D37A0DA0 X-CRM114-Status: UNSURE ( 9.00 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-mtd@lists.infradead.org, linux-mediatek@lists.infradead.org, srv_heupstream@mediatek.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org On Tue, 2019-05-07 at 10:25:39 UTC, Xiaolei Li wrote: > Currently, we expand RE# low level time by choosing the max value > between RE# pulse width and RE# access time, and sample data at the > rising edge of RE#. > > Then, if RE# access time is bigger than RE# pulse width, the real > read cycle time may be more than NAND SPEC required. This makes > read performance be worse than that expected. > > This patch improves data sampling timing by calculating RE# low level > time according to RE# pulse width. If RE# access time is bigger than > RE# pulse width, then delay sampling data timing. > > The result of contrast test base on MT2712 evaluat board is as follow. > > nand: Micron MT29F16G08ADBCAH4 > nand: 2048 MiB, SLC, erase size: 256 KiB, page size: 4096, OOB size: 224 > NFI 2x clock rate: 124800000 HZ. > > Read speed without this patch: > mtd_speedtest: page read speed is 14012 KiB/s > mtd_speedtest: 2 page read speed is 14860 KiB/s > > Read speed with this patch: > mtd_speedtest: page read speed is 18724 KiB/s > mtd_speedtest: 2 page read speed is 18713 KiB/s > > Signed-off-by: Xiaolei Li > Reviewed-by: Miquel Raynal Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git nand/next, thanks. Miquel ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/