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| author |   Patrice Chotard <patrice.chotard@foss.st.com> | 2021-05-18 18:27:53 +0200 |
|---|---|---|
| committer |   Mark Brown <broonie@kernel.org> | 2021-06-03 14:04:57 +0100 |
| commit | 8941cd8d295e40f8ea1c0a5045d6d068b8e33eec (patch) | |
| tree | 7079a3f7ca62ac028fa42908f85d8781169ddf0b /include/linux/mtd | |
| parent | spi: spi-mem: add automatic poll status functions (diff) | |
| download | linux-dev-8941cd8d295e40f8ea1c0a5045d6d068b8e33eec.tar.xz linux-dev-8941cd8d295e40f8ea1c0a5045d6d068b8e33eec.zip | |
mtd: spinand: use the spi-mem poll status APIs
Make use of spi-mem poll status APIs to let advanced controllers
optimize wait operations.
This should also fix the high CPU usage for system that don't have
a dedicated STATUS poll block logic.
Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Signed-off-by: Christophe Kerello <christophe.kerello@foss.st.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Acked-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20210518162754.15940-3-patrice.chotard@foss.st.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'include/linux/mtd')
| -rw-r--r-- | include/linux/mtd/spinand.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/include/linux/mtd/spinand.h b/include/linux/mtd/spinand.h index 6bb92f26833e..6988956b8492 100644 --- a/include/linux/mtd/spinand.h +++ b/include/linux/mtd/spinand.h @@ -170,6 +170,28 @@ struct spinand_op; struct spinand_device; #define SPINAND_MAX_ID_LEN 4 +/* + * For erase, write and read operation, we got the following timings : + * tBERS (erase) 1ms to 4ms + * tPROG 300us to 400us + * tREAD 25us to 100us + * In order to minimize latency, the min value is divided by 4 for the + * initial delay, and dividing by 20 for the poll delay. + * For reset, 5us/10us/500us if the device is respectively + * reading/programming/erasing when the RESET occurs. Since we always + * issue a RESET when the device is IDLE, 5us is selected for both initial + * and poll delay. + */ +#define SPINAND_READ_INITIAL_DELAY_US 6 +#define SPINAND_READ_POLL_DELAY_US 5 +#define SPINAND_RESET_INITIAL_DELAY_US 5 +#define SPINAND_RESET_POLL_DELAY_US 5 +#define SPINAND_WRITE_INITIAL_DELAY_US 75 +#define SPINAND_WRITE_POLL_DELAY_US 15 +#define SPINAND_ERASE_INITIAL_DELAY_US 250 +#define SPINAND_ERASE_POLL_DELAY_US 50 + +#define SPINAND_WAITRDY_TIMEOUT_MS 400 /** * struct spinand_id - SPI NAND id structure |