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Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1k9q5v-0000jF-LV; Sun, 23 Aug 2020 13:31:35 +0000 Received: from bhuna.collabora.co.uk ([46.235.227.227]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1k9q5s-0000ih-Bm for linux-mtd@lists.infradead.org; Sun, 23 Aug 2020 13:31:33 +0000 Received: from localhost (unknown [IPv6:2a01:e0a:2c:6930:5cf4:84a1:2763:fe0d]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: bbrezillon) by bhuna.collabora.co.uk (Postfix) with ESMTPSA id E3DAD298604; Sun, 23 Aug 2020 14:31:30 +0100 (BST) Date: Sun, 23 Aug 2020 15:31:27 +0200 From: Boris Brezillon To: Thirumalesha Narasimhappa Subject: Re: [PATCH v2] mtd: spinand: micron: add support for MT29F2G01AAAED Message-ID: <20200823153127.7498f0c0@collabora.com> In-Reply-To: <20200823111410.13049-1-nthirumalesha7@gmail.com> References: <20200823111410.13049-1-nthirumalesha7@gmail.com> Organization: Collabora X-Mailer: Claws Mail 3.17.6 (GTK+ 2.24.32; x86_64-redhat-linux-gnu) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200823_093132_489831_6C7535F9 X-CRM114-Status: GOOD ( 25.45 ) 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: Vignesh Raghavendra , Richard Weinberger , linux-kernel@vger.kernel.org, linux-mtd@lists.infradead.org, Miquel Raynal , Chuanhong Guo , Shivamurthy Shastri 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 Sun, 23 Aug 2020 19:14:10 +0800 Thirumalesha Narasimhappa wrote: > The MT29F2G01AAAED is a single die, 2Gb Micron SPI NAND Flash with 4-bit > ECC > > Signed-off-by: Thirumalesha Narasimhappa > --- > v2: removed SPINAND_SELECT_TARGET as per the comments & fixed typo errors > > drivers/mtd/nand/spi/micron.c | 78 +++++++++++++++++++++++++++++++++++ > 1 file changed, 78 insertions(+) > > diff --git a/drivers/mtd/nand/spi/micron.c b/drivers/mtd/nand/spi/micron.c > index 5d370cfcdaaa..c21ca395d657 100644 > --- a/drivers/mtd/nand/spi/micron.c > +++ b/drivers/mtd/nand/spi/micron.c > @@ -18,6 +18,9 @@ > #define MICRON_STATUS_ECC_4TO6_BITFLIPS (3 << 4) > #define MICRON_STATUS_ECC_7TO8_BITFLIPS (5 << 4) > > +/* For Micron MT29F2G01AAAED Device */ > +#define MICRON_STATUS_ECC_1TO4_BITFLIPS (1 << 4) > + You shouldn't need that new definition (see below). > #define MICRON_CFG_CR BIT(0) > > /* > @@ -44,6 +47,19 @@ static SPINAND_OP_VARIANTS(update_cache_variants, > SPINAND_PROG_LOAD_X4(false, 0, NULL, 0), > SPINAND_PROG_LOAD(false, 0, NULL, 0)); > > +/* Micron MT29F2G01AAAED Device */ > +static SPINAND_OP_VARIANTS(read_cache_variants_mt29f2g01aaaed, > + SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0), > + SPINAND_PAGE_READ_FROM_CACHE_X2_OP(0, 1, NULL, 0), > + SPINAND_PAGE_READ_FROM_CACHE_OP(true, 0, 1, NULL, 0), > + SPINAND_PAGE_READ_FROM_CACHE_OP(false, 0, 1, NULL, 0)); > + > +static SPINAND_OP_VARIANTS(write_cache_variants_mt29f2g01aaaed, > + SPINAND_PROG_LOAD(true, 0, NULL, 0)); > + > +static SPINAND_OP_VARIANTS(update_cache_variants_mt29f2g01aaaed, > + SPINAND_PROG_LOAD(false, 0, NULL, 0)); > + Okay, I'd suggest picking more generic names. How about renaming the existing variants into quadio_read_cache_variants, x4_write_cache_variants and x4_update_cache_variants and naming the new ones x4_read_cache_variants, x1_write_cache_variants and x1_update_cache_variants. > static int micron_8_ooblayout_ecc(struct mtd_info *mtd, int section, > struct mtd_oob_region *region) > { > @@ -69,11 +85,41 @@ static int micron_8_ooblayout_free(struct mtd_info *mtd, int section, > return 0; > } > > +static int mt29f2g01aaaed_ooblayout_ecc(struct mtd_info *mtd, int section, > + struct mtd_oob_region *region) > +{ > + if (section >= 4) > + return -ERANGE; Hm, I'd try to deduce the max section based on the pagesize/ecc-step-size so we can re-use the same ooblayout def for different pagesize/ecc-step-size combinations. > + > + region->offset = (section * 16) + 8; > + region->length = 8; > + > + return 0; > +} > + > +static int mt29f2g01aaaed_ooblayout_free(struct mtd_info *mtd, int section, > + struct mtd_oob_region *region) > +{ > + if (section >= 4) > + return -ERANGE; > + > + /* Reserve 2 bytes for the BBM. */ > + region->offset = (section * 16) + 2; You should probably only reserve those 2 bytes in section 0 (where the BBM is). > + region->length = 6; > + > + return 0; > +} > + > static const struct mtd_ooblayout_ops micron_8_ooblayout = { > .ecc = micron_8_ooblayout_ecc, > .free = micron_8_ooblayout_free, > }; > > +static const struct mtd_ooblayout_ops mt29f2g01aaaed_ooblayout = { Maybe name that one micron_interleaved_ooblayout, and rename micron_8_ooblayout into micron_grouped_ooblayout. > + .ecc = mt29f2g01aaaed_ooblayout_ecc, > + .free = mt29f2g01aaaed_ooblayout_free, > +}; > + > static int micron_select_target(struct spinand_device *spinand, > unsigned int target) > { > @@ -114,6 +160,27 @@ static int micron_8_ecc_get_status(struct spinand_device *spinand, > return -EINVAL; > } > > +static int mt29f2g01aaaed_ecc_get_status(struct spinand_device *spinand, > + u8 status) > +{ > + switch (status & MICRON_STATUS_ECC_MASK) { > + case STATUS_ECC_NO_BITFLIPS: > + return 0; > + > + case STATUS_ECC_UNCOR_ERROR: > + return -EBADMSG; > + > + /* 1 to 4-bit error detected and corrected */ > + case MICRON_STATUS_ECC_1TO4_BITFLIPS: > + return 4; > + > + default: > + break; > + } > + > + return -EINVAL; > +} Looks like you're duplicating spinand_check_ecc_status(). Just leave the get_status hook to NULL, that should do trick. ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/