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=-9.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,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 5A7F0C433E0 for ; Mon, 18 May 2020 14:00:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2B04420709 for ; Mon, 18 May 2020 14:00:11 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="fvwBdK3J" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727999AbgEROAK (ORCPT ); Mon, 18 May 2020 10:00:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53014 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726989AbgEROAH (ORCPT ); Mon, 18 May 2020 10:00:07 -0400 Received: from mail-wm1-x344.google.com (mail-wm1-x344.google.com [IPv6:2a00:1450:4864:20::344]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DBD53C061A0C for ; Mon, 18 May 2020 07:00:05 -0700 (PDT) Received: by mail-wm1-x344.google.com with SMTP id z4so8244142wmi.2 for ; Mon, 18 May 2020 07:00:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=FX8TNCptGGK3iFTps84rr7nd+amFy6w3yf6z9n1Ntbk=; b=fvwBdK3JrAS72Dg6AZKgn0+tDykNrwg7gBBpffsQZ1vQJ0XMc/ibB4ETfko3UFcvST wXEiRcfmAFxQk1Ap53rY1dn8+X5QKy3BM6uQlY303heMxa2vmCiQKYw1oaGrlW9D5DFt Fk/uURXAqymSJp/MsSIAaWuQtrIMI3Na2Z000BEEd5hINmqMOu6abWDn48bd7VOcE5s+ u97yG3gsaeqvHfIK6Bc4JXtWeInBjO9fGvS1oiosg9mcB0Q7/JjkgP8ece6UfwzsShyk HRDrV4NAy3UiHCStXLEzW3uI9OW1Jh19OiO3rYAtTLU/HmAE4eCbWOOJrUl/qxzQLSWf bJdA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=FX8TNCptGGK3iFTps84rr7nd+amFy6w3yf6z9n1Ntbk=; b=Z5kWAG8vDC3HAMd0EBpE0CFcfrWwV/XI64ntDk0/pX1b8p5OSTZCz80E2pWtu26V5t dMhyFFlN/vdIs89//My4M4AuHOivzz/7I9YTKZnt755jHM+IubvY3iHrZq8znhvB0mgE HlSWwfDdIj/3weeBmCMaT9wUx9/+55ChYr3yMUTC87aW6DvN1+CmoHOJ3MQyixewX8wf G2WAcDuH//glFJ9y0SghsiWpFTJ40xkSMNrpw6TmH5JYw3BFKPJDko2ZWzKlBzMZ4Ou2 NggVzngvm4COjfEWHt4y5ad0vWkuumI5Fsh1o4ts10xBIOzohl5z/0e+lXwA84jSVPS+ 3mQg== X-Gm-Message-State: AOAM530maMntjr1kwm3uQqBbOpKr+A98625STVQVxAJXd6gLm4BRbKRq Ze5nJ9vpt9WKX6rDFnFKeog= X-Google-Smtp-Source: ABdhPJwQczAFkXPerpxOthlTabAANkJyTxrBuMCTEbYwFXhB9QX9Ob73IFV5eoS0xDp0Z2eDCKOEqA== X-Received: by 2002:a1c:cc1a:: with SMTP id h26mr18839093wmb.127.1589810404636; Mon, 18 May 2020 07:00:04 -0700 (PDT) Received: from localhost.localdomain ([2a01:598:b884:8d4:84ab:c471:b6eb:fcab]) by smtp.gmail.com with ESMTPSA id 81sm18114519wme.16.2020.05.18.07.00.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 May 2020 07:00:04 -0700 (PDT) From: Bean Huo To: miquel.raynal@bootlin.com, richard@nod.at, vigneshr@ti.com, s.hauer@pengutronix.de, boris.brezillon@collabora.com, derosier@gmail.com Cc: linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org, huobean@gmail.com, Bean Huo Subject: [PATCH v4 4/5] mtd: rawnand: Introduce a new function nand_check_is_erased_page() Date: Mon, 18 May 2020 15:59:42 +0200 Message-Id: <20200518135943.11749-5-huobean@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200518135943.11749-1-huobean@gmail.com> References: <20200518135943.11749-1-huobean@gmail.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Bean Huo Add a new function nand_check_is_erased_page() in nand_base.c, which is used to check whether one programmable page is empty or already programmed. Signed-off-by: Bean Huo --- drivers/mtd/nand/raw/nand_base.c | 41 ++++++++++++++++++++++++++++++++ include/linux/mtd/rawnand.h | 2 ++ 2 files changed, 43 insertions(+) diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c index 09ee490c08a9..2b9862d9979b 100644 --- a/drivers/mtd/nand/raw/nand_base.c +++ b/drivers/mtd/nand/raw/nand_base.c @@ -2646,6 +2646,47 @@ int nand_check_erased_ecc_chunk(void *data, int datalen, } EXPORT_SYMBOL(nand_check_erased_ecc_chunk); +/** + * nand_check_is_erased_page - check if this page is a empty page + * @chip: nand chip info structure + * @page_data: data buffer containing the data in the page being checked + * @oob: indicate if chip->oob_poi points to oob date of the page + * + * Returns true if this is an un-programmed page, false otherwise. + */ +int nand_check_is_erased_page(struct nand_chip *chip, u8 *page_data, bool oob) +{ + struct mtd_info *mtd = nand_to_mtd(chip); + int ret, i; + u8 *databuf, *eccbuf = NULL; + struct mtd_oob_region oobregion; + int datasize, eccbytes = 0; + + databuf = page_data; + datasize = chip->ecc.size; + + if (oob) { + mtd_ooblayout_ecc(mtd, 0, &oobregion); + eccbuf = chip->oob_poi + oobregion.offset; + eccbytes = chip->ecc.bytes; + } + max_bitflips = 0; + + for (i = 0; i < chip->ecc.steps; i++) { + ret = nand_check_erased_ecc_chunk(databuf, datasize, + eccbuf, eccbytes, + NULL, 0, chip->ecc.strength); + if (ret < 0) + return false; + + databuf += chip->ecc.size; + eccbuf += chip->ecc.bytes; + } + + return ret; +} +EXPORT_SYMBOL(nand_check_is_erased_page); + /** * nand_read_page_raw_notsupp - dummy read raw page function * @chip: nand chip info structure diff --git a/include/linux/mtd/rawnand.h b/include/linux/mtd/rawnand.h index 3d75e50e5b75..718ce81eb111 100644 --- a/include/linux/mtd/rawnand.h +++ b/include/linux/mtd/rawnand.h @@ -1337,6 +1337,8 @@ int nand_check_erased_ecc_chunk(void *data, int datalen, void *extraoob, int extraooblen, int threshold); +int nand_check_is_erased_page(struct nand_chip *chip, u8 *page_data, bool oob); + int nand_ecc_choose_conf(struct nand_chip *chip, const struct nand_ecc_caps *caps, int oobavail); -- 2.17.1