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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 Firt of them will have issues with continuous reading if restriction on the transfer length is implemented in the adjust_op_size() handler. 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..02e322490110 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( + 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(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; info.op_tmpl.data.ecc =3D true; - desc =3D devm_spi_mem_dirmap_create(&spinand->spimem->spi->dev, - spinand->spimem, &info); + desc =3D spinand_create_rdesc(spinand, &info); if (IS_ERR(desc)) return PTR_ERR(desc); =20 --=20 2.51.0