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mtd: spinand: add SPI-NAND MTD resume handler

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After power up, all SPI NAND's blocks are locked. Only read operations
are allowed, write and erase operations are forbidden.
The SPI NAND framework unlocks all the blocks during its initialization.

During a standby low power, the memory is powered down, losing its
configuration.
During the resume, the QSPI driver state is restored but the SPI NAND
framework does not reconfigured the memory.

This patch adds SPI-NAND MTD PM handlers for resume ops.
SPI NAND resume op re-initializes SPI NAND flash to its probed state.

Signed-off-by: Christophe Kerello <christophe.kerello@foss.st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20210602094913.26472-4-patrice.chotard@foss.st.com
This commit is contained in:
Patrice Chotard 2021-06-02 11:49:13 +02:00 committed by Miquel Raynal
parent 41e005c23e
commit f145b9dcf9
1 changed files with 17 additions and 0 deletions
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17
drivers/mtd/nand/spi/core.c
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@ -1129,6 +1129,22 @@ static int spinand_init_flash(struct spinand_device *spinand)
return ret;
}
static void spinand_mtd_resume(struct mtd_info *mtd)
{
struct spinand_device *spinand = mtd_to_spinand(mtd);
int ret;
ret = spinand_reset_op(spinand);
if (ret)
return;
ret = spinand_init_flash(spinand);
if (ret)
return;
spinand_ecc_enable(spinand, false);
}
static int spinand_init(struct spinand_device *spinand)
{
struct device *dev = &spinand->spimem->spi->dev;
@ -1199,6 +1215,7 @@ static int spinand_init(struct spinand_device *spinand)
mtd->_block_isreserved = spinand_mtd_block_isreserved;
mtd->_erase = spinand_mtd_erase;
mtd->_max_bad_blocks = nanddev_mtd_max_bad_blocks;
mtd->_resume = spinand_mtd_resume;
if (nand->ecc.engine) {
ret = mtd_ooblayout_count_freebytes(mtd);