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[95.91.252.200]) by smtp.gmail.com with ESMTPSA id 128sm491210wme.39.2020.05.14.14.23.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 14 May 2020 14:23:54 -0700 (PDT) From: huobean@gmail.com X-Google-Original-From: beanhuo@micron.com 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, Bean Huo Subject: [PATCH v3 4/5] mtd: rawnand: Introduce a new function nand_check_is_erased_page() Date: Thu, 14 May 2020 23:23:32 +0200 Message-Id: <20200514212333.28692-5-beanhuo@micron.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200514212333.28692-1-beanhuo@micron.com> References: <20200514212333.28692-1-beanhuo@micron.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 | 49 ++++++++++++++++++++++++++++++++ include/linux/mtd/rawnand.h | 2 ++ 2 files changed, 51 insertions(+) diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c index b630f7f6a651..2bc9be745bc1 100644 --- a/drivers/mtd/nand/raw/nand_base.c +++ b/drivers/mtd/nand/raw/nand_base.c @@ -2584,6 +2584,55 @@ 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, max_bitflips; + 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; + + max_bitflips = max(ret, max_bitflips); + + databuf += chip->ecc.size; + eccbuf += chip->ecc.bytes; + } + + /* + * As for the empty/erased page, bitflips number should be zero or at + * least less than the bitflip_threshold. + */ + ret = max_bitflips < mtd->bitflip_threshold; + + 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 a1bb2acfaf6a..bb97b48859f9 100644 --- a/include/linux/mtd/rawnand.h +++ b/include/linux/mtd/rawnand.h @@ -1322,6 +1322,8 @@ 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