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charset="utf-8" Continuous mode is only supported for data reads, thus writing requires only single flash page mapping. Signed-off-by: Mikhail Kshevetskiy --- drivers/mtd/nand/spi/core.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c index b0898990b2a5..09dd6e40e308 100644 --- a/drivers/mtd/nand/spi/core.c +++ b/drivers/mtd/nand/spi/core.c @@ -1097,18 +1097,13 @@ static int spinand_create_dirmap(struct spinand_dev= ice *spinand, unsigned int plane) { struct nand_device *nand =3D spinand_to_nand(spinand); - struct spi_mem_dirmap_info info =3D { - .length =3D nanddev_page_size(nand) + - nanddev_per_page_oobsize(nand), - }; + struct spi_mem_dirmap_info info =3D { 0 }; struct spi_mem_dirmap_desc *desc; =20 - if (spinand->cont_read_possible) - info.length =3D nanddev_eraseblock_size(nand); - /* The plane number is passed in MSB just above the column address */ info.offset =3D plane << fls(nand->memorg.pagesize); =20 + info.length =3D nanddev_page_size(nand) + nanddev_per_page_oobsize(nand); info.op_tmpl =3D *spinand->op_templates.update_cache; desc =3D devm_spi_mem_dirmap_create(&spinand->spimem->spi->dev, spinand->spimem, &info); @@ -1117,6 +1112,8 @@ static int spinand_create_dirmap(struct spinand_devic= e *spinand, =20 spinand->dirmaps[plane].wdesc =3D desc; =20 + if (spinand->cont_read_possible) + info.length =3D nanddev_eraseblock_size(nand); info.op_tmpl =3D *spinand->op_templates.read_cache; desc =3D devm_spi_mem_dirmap_create(&spinand->spimem->spi->dev, spinand->spimem, &info); @@ -1132,6 +1129,7 @@ static int spinand_create_dirmap(struct spinand_devic= e *spinand, return 0; } =20 + info.length =3D nanddev_page_size(nand) + nanddev_per_page_oobsize(nand); info.op_tmpl =3D *spinand->op_templates.update_cache; info.op_tmpl.data.ecc =3D true; desc =3D devm_spi_mem_dirmap_create(&spinand->spimem->spi->dev, @@ -1141,6 +1139,8 @@ static int spinand_create_dirmap(struct spinand_devic= e *spinand, =20 spinand->dirmaps[plane].wdesc_ecc =3D desc; =20 + if (spinand->cont_read_possible) + info.length =3D nanddev_eraseblock_size(nand); 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charset="utf-8" Continuous reading may result in multiple flash pages reading in one operation. Typically only one flash page has read/written (a little bit more than 2-4 Kb), but continuous reading requires the spi controller to read up to 512 Kb in one operation without toggling CS in beetween. Roughly speaking spi controllers can be divided on 2 categories: * spi controllers without dirmap acceleration support * spi controllers with dirmap acceleration support Usually, first of them have no issues with large reading support. Second group often supports acceleration of single page only reading. Thus enabling of continuous reading can break flash reading. This patch tries to create dirmap for continuous reading first and fallback to regular reading if spi controller refuses to create it. Signed-off-by: Mikhail Kshevetskiy --- drivers/mtd/nand/spi/core.c | 43 ++++++++++++++++++++++++++++++------- 1 file changed, 35 insertions(+), 8 deletions(-) diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c index 09dd6e40e308..0f8636047365 100644 --- a/drivers/mtd/nand/spi/core.c +++ b/drivers/mtd/nand/spi/core.c @@ -1093,6 +1093,39 @@ static int spinand_mtd_block_isreserved(struct mtd_i= nfo *mtd, loff_t offs) return ret; } =20 +static struct spi_mem_dirmap_desc *spinand_create_rdesc_helper( + struct spinand_device *spinand, + struct spi_mem_dirmap_info *info) +{ + struct nand_device *nand =3D spinand_to_nand(spinand); + struct spi_mem_dirmap_desc *desc =3D NULL; + + if (spinand->cont_read_possible) { + /* + * spi controller may return an error if info->length is + * too large + */ + info->length =3D nanddev_eraseblock_size(nand); + desc =3D devm_spi_mem_dirmap_create(&spinand->spimem->spi->dev, + spinand->spimem, info); + } + + if (IS_ERR_OR_NULL(desc)) { + /* + * continuous reading is not supported by flash or + * its spi controller, use regular reading + */ + spinand->cont_read_possible =3D false; + + info->length =3D nanddev_page_size(nand) + + nanddev_per_page_oobsize(nand); + desc =3D devm_spi_mem_dirmap_create(&spinand->spimem->spi->dev, + spinand->spimem, info); + } + + return desc; +} + static int spinand_create_dirmap(struct spinand_device *spinand, unsigned int plane) { @@ -1112,11 +1145,8 @@ static int spinand_create_dirmap(struct spinand_devi= ce *spinand, =20 spinand->dirmaps[plane].wdesc =3D desc; =20 - if (spinand->cont_read_possible) - info.length =3D nanddev_eraseblock_size(nand); info.op_tmpl =3D *spinand->op_templates.read_cache; - desc =3D devm_spi_mem_dirmap_create(&spinand->spimem->spi->dev, - spinand->spimem, &info); + desc =3D spinand_create_rdesc_helper(spinand, &info); if (IS_ERR(desc)) return PTR_ERR(desc); =20 @@ -1139,12 +1169,9 @@ static int spinand_create_dirmap(struct spinand_devi= ce *spinand, =20 spinand->dirmaps[plane].wdesc_ecc =3D desc; =20 - if (spinand->cont_read_possible) - info.length =3D nanddev_eraseblock_size(nand); info.op_tmpl =3D *spinand->op_templates.read_cache; 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charset="utf-8" Continuous reading may result in multiple flash pages reading in one operation. Unfortunately, not all spinand controllers support such large reading. They will read less data. Unfortunately, the operation can't be continued. In this case: * disable continuous reading on this (not good enough) spi controller * repeat reading in regular mode. Signed-off-by: Mikhail Kshevetskiy --- drivers/mtd/nand/spi/core.c | 39 ++++++++++++++++++++++++++++--------- 1 file changed, 30 insertions(+), 9 deletions(-) diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c index 0f8636047365..5528e1f72dbc 100644 --- a/drivers/mtd/nand/spi/core.c +++ b/drivers/mtd/nand/spi/core.c @@ -378,7 +378,8 @@ static int spinand_load_page_op(struct spinand_device *= spinand, } =20 static int spinand_read_from_cache_op(struct spinand_device *spinand, - const struct nand_page_io_req *req) + const struct nand_page_io_req *req, + bool *controller_is_buggy) { struct nand_device *nand =3D spinand_to_nand(spinand); struct mtd_info *mtd =3D spinand_to_mtd(spinand); @@ -430,8 +431,11 @@ static int spinand_read_from_cache_op(struct spinand_d= evice *spinand, * Dirmap accesses are allowed to toggle the CS. * Toggling the CS during a continuous read is forbidden. */ - if (nbytes && req->continuous) + if (nbytes && req->continuous) { + if (controller_is_buggy) + *controller_is_buggy =3D true; return -EIO; + } } =20 if (req->datalen) @@ -646,7 +650,7 @@ int spinand_read_page(struct spinand_device *spinand, =20 spinand_ondie_ecc_save_status(nand, status); =20 - ret =3D spinand_read_from_cache_op(spinand, req); + ret =3D spinand_read_from_cache_op(spinand, req, NULL); if (ret) return ret; =20 @@ -770,7 +774,8 @@ static int spinand_mtd_regular_page_read(struct mtd_inf= o *mtd, loff_t from, =20 static int spinand_mtd_continuous_page_read(struct mtd_info *mtd, loff_t f= rom, struct mtd_oob_ops *ops, - unsigned int *max_bitflips) + unsigned int *max_bitflips, + bool *controller_is_buggy) { struct spinand_device *spinand =3D mtd_to_spinand(mtd); struct nand_device *nand =3D mtd_to_nanddev(mtd); @@ -808,7 +813,7 @@ static int spinand_mtd_continuous_page_read(struct mtd_= info *mtd, loff_t from, if (ret < 0) goto end_cont_read; =20 - ret =3D spinand_read_from_cache_op(spinand, &iter.req); + ret =3D spinand_read_from_cache_op(spinand, &iter.req, controller_is_bug= gy); if (ret) goto end_cont_read; =20 @@ -892,6 +897,7 @@ static int spinand_mtd_read(struct mtd_info *mtd, loff_= t from, { struct spinand_device *spinand =3D mtd_to_spinand(mtd); struct mtd_ecc_stats old_stats; + bool controller_is_buggy =3D false; unsigned int max_bitflips =3D 0; int ret; =20 @@ -899,10 +905,25 @@ static int spinand_mtd_read(struct mtd_info *mtd, lof= f_t from, =20 old_stats =3D mtd->ecc_stats; =20 - if (spinand_use_cont_read(mtd, from, ops)) - ret =3D spinand_mtd_continuous_page_read(mtd, from, ops, &max_bitflips); - else - ret =3D spinand_mtd_regular_page_read(mtd, from, ops, &max_bitflips); + if (spinand_use_cont_read(mtd, from, ops)) { + ret =3D spinand_mtd_continuous_page_read(mtd, from, ops, + &max_bitflips, + &controller_is_buggy); + if (controller_is_buggy) { + /* + * Some spi controllers may not support reading up to + * erase block size. They will read less data than + * expected. 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Thu, 14 Aug 2025 06:54:39 +0000 Received: from GV2PR08MB8121.eurprd08.prod.outlook.com ([fe80::4cd3:da80:2532:daa0]) by GV2PR08MB8121.eurprd08.prod.outlook.com ([fe80::4cd3:da80:2532:daa0%4]) with mapi id 15.20.8989.018; Thu, 14 Aug 2025 06:54:38 +0000 From: Mikhail Kshevetskiy To: Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Lorenzo Bianconi , Ray Liu , Mark Brown , Tudor Ambarus , Martin Kurbanov , Takahiro Kuwano , Cheng Ming Lin , linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-spi@vger.kernel.org Cc: Mikhail Kshevetskiy Subject: [PATCH RESEND v2 4/4] spi: spi-airoha-snfi: return an error for continuous mode dirmap creation cases Date: Thu, 14 Aug 2025 09:54:23 +0300 Message-ID: <20250814065423.3980305-5-mikhail.kshevetskiy@iopsys.eu> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250814065423.3980305-1-mikhail.kshevetskiy@iopsys.eu> References: <20250814065423.3980305-1-mikhail.kshevetskiy@iopsys.eu> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: HE1PR05CA0149.eurprd05.prod.outlook.com (2603:10a6:7:28::36) To GV2PR08MB8121.eurprd08.prod.outlook.com (2603:10a6:150:7d::22) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: GV2PR08MB8121:EE_|PAVPR08MB9013:EE_ X-MS-Office365-Filtering-Correlation-Id: b57b136b-7566-4c48-835c-08dddaff7008 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|52116014|376014|7416014|921020|38350700014; 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charset="utf-8" This driver can accelerate single page operations only, thus continuous reading mode should not be used. Continuous reading will use sizes up to the size of one erase block. This size is much larger than the size of single flash page. Use this difference to identify continuous reading and return an error. Signed-off-by: Mikhail Kshevetskiy Reviewed-by: Frieder Schrempf --- drivers/spi/spi-airoha-snfi.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/spi/spi-airoha-snfi.c b/drivers/spi/spi-airoha-snfi.c index dbe640986825..043a03cd90a1 100644 --- a/drivers/spi/spi-airoha-snfi.c +++ b/drivers/spi/spi-airoha-snfi.c @@ -618,6 +618,10 @@ static int airoha_snand_dirmap_create(struct spi_mem_d= irmap_desc *desc) if (desc->info.offset + desc->info.length > U32_MAX) return -EINVAL; =20 + /* continuous reading is not supported */ + if (desc->info.length > SPI_NAND_CACHE_SIZE) + return -E2BIG; + if (!airoha_snand_supports_op(desc->mem, &desc->info.op_tmpl)) return -EOPNOTSUPP; =20 --=20 2.50.1