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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,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 6FC04C433DF for ; Fri, 29 May 2020 11:18:21 +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 3A4C6207D4 for ; Fri, 29 May 2020 11:18:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="Elgc+vlb" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3A4C6207D4 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=omAqRafTZKErGmpe+tA10DmO1eo9sP6mzwS4bpWkJsM=; b=Elgc+vlbH5fNrM 7BBRqW5sfbs7wvORa8gCp5UtaaNGPVOc3bWrF6D5K7Xt+BXCxhnF/UT7GdHxC0N8kEWqpxQmvP2Vc vtV8Jy/lKhoAMmTN9hpBCU+Vhzy++TG5HgMFlxTZ35VDzyop2fF2v5quWD8FssL0F+UjW6KbZa2zJ sgIWiP7rO48uZLqoZRDDL97Kgil3DJB3xcrLOod9Cidr8VwvXV8GDZ6i7SSgktrUx/xKNjY9Ob3h0 Wf35V3HzfazdcCLFZzKEpP3AbezJ9fF63wKRFk8avRf874aC26VKrfKEz4oBH5HSByTBzNxpFvJA3 o52ps/oU0DEGOltfC1ug==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jed1m-0001Gu-8w; Fri, 29 May 2020 11:18:18 +0000 Received: from relay1-d.mail.gandi.net ([217.70.183.193]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jecxN-0003Ri-I6 for linux-mtd@lists.infradead.org; Fri, 29 May 2020 11:13:47 +0000 X-Originating-IP: 91.224.148.103 Received: from localhost.localdomain (unknown [91.224.148.103]) (Authenticated sender: miquel.raynal@bootlin.com) by relay1-d.mail.gandi.net (Postfix) with ESMTPSA id 24140240009; Fri, 29 May 2020 11:13:43 +0000 (UTC) From: Miquel Raynal To: Richard Weinberger , Vignesh Raghavendra , Tudor Ambarus , Subject: [PATCH v7 15/28] mtd: rawnand: timings: Add a helper to find the closest ONFI mode Date: Fri, 29 May 2020 13:13:09 +0200 Message-Id: <20200529111322.7184-16-miquel.raynal@bootlin.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200529111322.7184-1-miquel.raynal@bootlin.com> References: <20200529111322.7184-1-miquel.raynal@bootlin.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200529_041345_876961_60BAF2BA X-CRM114-Status: GOOD ( 12.05 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Michal Simek , Boris Brezillon , Naga Sureshkumar Relli , Thomas Petazzoni , Miquel Raynal 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 Vendors are allowed to provide their own set of timings. In this case, we provide a way to derive the "closest" timing mode so that, if the NAND controller does not support tweaking these parameters, it will be able to configure itself anyway. Signed-off-by: Miquel Raynal Reviewed-by: Boris Brezillon --- drivers/mtd/nand/raw/internals.h | 2 ++ drivers/mtd/nand/raw/nand_timings.c | 47 +++++++++++++++++++++++++++++ 2 files changed, 49 insertions(+) diff --git a/drivers/mtd/nand/raw/internals.h b/drivers/mtd/nand/raw/internals.h index bd10ec92f04a..f851ed210d70 100644 --- a/drivers/mtd/nand/raw/internals.h +++ b/drivers/mtd/nand/raw/internals.h @@ -88,6 +88,8 @@ int onfi_fill_data_interface(struct nand_chip *chip, struct nand_data_interface *iface, enum nand_data_interface_type type, unsigned int timing_mode); +unsigned int +onfi_find_closest_sdr_mode(const struct nand_sdr_timings *spec_timings); int nand_get_features(struct nand_chip *chip, int addr, u8 *subfeature_param); int nand_set_features(struct nand_chip *chip, int addr, u8 *subfeature_param); int nand_read_page_raw_notsupp(struct nand_chip *chip, u8 *buf, diff --git a/drivers/mtd/nand/raw/nand_timings.c b/drivers/mtd/nand/raw/nand_timings.c index 08dc381349fa..b089f2dc5f23 100644 --- a/drivers/mtd/nand/raw/nand_timings.c +++ b/drivers/mtd/nand/raw/nand_timings.c @@ -273,6 +273,53 @@ static const struct nand_data_interface onfi_sdr_timings[] = { }, }; +/** + * onfi_find_closest_sdr_mode - Derive the closest ONFI SDR timing mode given a + * set of timings + * @spec_timings: the timings to challenge + */ +unsigned int +onfi_find_closest_sdr_mode(const struct nand_sdr_timings *spec_timings) +{ + const struct nand_sdr_timings *onfi_timings; + int mode; + + for (mode = ARRAY_SIZE(onfi_sdr_timings) - 1; mode > 0; mode--) { + onfi_timings = &onfi_sdr_timings[mode].timings.sdr; + + if (spec_timings->tCCS_min <= onfi_timings->tCCS_min && + spec_timings->tADL_min <= onfi_timings->tADL_min && + spec_timings->tALH_min <= onfi_timings->tALH_min && + spec_timings->tALS_min <= onfi_timings->tALS_min && + spec_timings->tAR_min <= onfi_timings->tAR_min && + spec_timings->tCEH_min <= onfi_timings->tCEH_min && + spec_timings->tCH_min <= onfi_timings->tCH_min && + spec_timings->tCLH_min <= onfi_timings->tCLH_min && + spec_timings->tCLR_min <= onfi_timings->tCLR_min && + spec_timings->tCLS_min <= onfi_timings->tCLS_min && + spec_timings->tCOH_min <= onfi_timings->tCOH_min && + spec_timings->tCS_min <= onfi_timings->tCS_min && + spec_timings->tDH_min <= onfi_timings->tDH_min && + spec_timings->tDS_min <= onfi_timings->tDS_min && + spec_timings->tIR_min <= onfi_timings->tIR_min && + spec_timings->tRC_min <= onfi_timings->tRC_min && + spec_timings->tREH_min <= onfi_timings->tREH_min && + spec_timings->tRHOH_min <= onfi_timings->tRHOH_min && + spec_timings->tRHW_min <= onfi_timings->tRHW_min && + spec_timings->tRLOH_min <= onfi_timings->tRLOH_min && + spec_timings->tRP_min <= onfi_timings->tRP_min && + spec_timings->tRR_min <= onfi_timings->tRR_min && + spec_timings->tWC_min <= onfi_timings->tWC_min && + spec_timings->tWH_min <= onfi_timings->tWH_min && + spec_timings->tWHR_min <= onfi_timings->tWHR_min && + spec_timings->tWP_min <= onfi_timings->tWP_min && + spec_timings->tWW_min <= onfi_timings->tWW_min) + return mode; + } + + return 0; +} + /** * onfi_fill_data_interface - Initialize a data interface from a given ONFI mode * @chip: The NAND chip -- 2.20.1 ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/