From: <Tudor.Ambarus@microchip.com>
To: <p.yadav@ti.com>, <miquel.raynal@bootlin.com>, <richard@nod.at>,
<vigneshr@ti.com>, <linux-mtd@lists.infradead.org>,
<linux-kernel@vger.kernel.org>
Cc: boris.brezillon@collabora.com, nsekhar@ti.com
Subject: Re: [PATCH v14 12/15] mtd: spi-nor: core: perform a Soft Reset on shutdown
Date: Thu, 1 Oct 2020 08:23:48 +0000 [thread overview]
Message-ID: <c1f8eadb-640c-1299-c075-946a3aeb98a5@microchip.com> (raw)
In-Reply-To: <20200930185732.6201-13-p.yadav@ti.com>
On 9/30/20 9:57 PM, Pratyush Yadav wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>
> Perform a Soft Reset on shutdown on flashes that support it so that the
> flash can be reset to its initial state and any configurations made by
> spi-nor (given that they're only done in volatile registers) will be
> reset. This will hand back the flash in pristine state for any further
> operations on it.
>
> Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com>
> ---
> drivers/mtd/spi-nor/core.c | 45 +++++++++++++++++++++++++++++++++++++
> include/linux/mtd/spi-nor.h | 2 ++
> 2 files changed, 47 insertions(+)
>
> diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
> index b42d59ab2724..9de811b33125 100644
> --- a/drivers/mtd/spi-nor/core.c
> +++ b/drivers/mtd/spi-nor/core.c
> @@ -40,6 +40,9 @@
>
> #define SPI_NOR_MAX_ADDR_WIDTH 4
>
> +#define SPI_NOR_SRST_SLEEP_MIN 200
> +#define SPI_NOR_SRST_SLEEP_MAX 400
> +
> /**
> * spi_nor_get_cmd_ext() - Get the command opcode extension based on the
> * extension type.
> @@ -3175,6 +3178,45 @@ static int spi_nor_init(struct spi_nor *nor)
> return 0;
> }
>
> +static void spi_nor_soft_reset(struct spi_nor *nor)
> +{
> + struct spi_mem_op op;
> + int ret;
> +
> + op = (struct spi_mem_op)SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_SRSTEN, 0),
> + SPI_MEM_OP_NO_DUMMY,
> + SPI_MEM_OP_NO_ADDR,
> + SPI_MEM_OP_NO_DATA);
> +
> + spi_nor_spimem_setup_op(nor, &op, nor->reg_proto);
> +
> + ret = spi_mem_exec_op(nor->spimem, &op);
> + if (ret) {
> + dev_warn(nor->dev, "Software reset failed: %d\n", ret);
> + return;
> + }
> +
> + op = (struct spi_mem_op)SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_SRST, 0),
> + SPI_MEM_OP_NO_DUMMY,
> + SPI_MEM_OP_NO_ADDR,
> + SPI_MEM_OP_NO_DATA);
> +
> + spi_nor_spimem_setup_op(nor, &op, nor->reg_proto);
> +
> + ret = spi_mem_exec_op(nor->spimem, &op);
> + if (ret) {
> + dev_warn(nor->dev, "Software reset failed: %d\n", ret);
> + return;
> + }
> +
> + /*
> + * Software Reset is not instant, and the delay varies from flash to
> + * flash. Looking at a few flashes, most range somewhere below 100
> + * microseconds. So, sleep for a range of 200-400 us.
> + */
> + usleep_range(SPI_NOR_SRST_SLEEP_MIN, SPI_NOR_SRST_SLEEP_MAX);
> +}
> +
> /* mtd resume handler */
> static void spi_nor_resume(struct mtd_info *mtd)
> {
> @@ -3194,6 +3236,9 @@ void spi_nor_restore(struct spi_nor *nor)
> if (nor->addr_width == 4 && !(nor->flags & SNOR_F_4B_OPCODES) &&
> nor->flags & SNOR_F_BROKEN_RESET)
> nor->params->set_4byte_addr_mode(nor, false);
> +
> + if (nor->flags & SNOR_F_SOFT_RESET)
> + spi_nor_soft_reset(nor);
> }
> EXPORT_SYMBOL_GPL(spi_nor_restore);
>
> diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
> index cd549042c53d..299685d15dc2 100644
> --- a/include/linux/mtd/spi-nor.h
> +++ b/include/linux/mtd/spi-nor.h
> @@ -51,6 +51,8 @@
> #define SPINOR_OP_CLFSR 0x50 /* Clear flag status register */
> #define SPINOR_OP_RDEAR 0xc8 /* Read Extended Address Register */
> #define SPINOR_OP_WREAR 0xc5 /* Write Extended Address Register */
> +#define SPINOR_OP_SRSTEN 0x66 /* Software Reset Enable */
> +#define SPINOR_OP_SRST 0x99 /* Software Reset */
>
> /* 4-byte address opcodes - used on Spansion and some Macronix flashes. */
> #define SPINOR_OP_READ_4B 0x13 /* Read data bytes (low frequency) */
> --
> 2.28.0
>
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next prev parent reply other threads:[~2020-10-01 8:24 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-30 18:57 [PATCH v14 00/15] mtd: spi-nor: add xSPI Octal DTR support Pratyush Yadav
2020-09-30 18:57 ` [PATCH v14 01/15] mtd: spi-nor: core: use EOPNOTSUPP instead of ENOTSUPP Pratyush Yadav
2020-10-01 7:19 ` Tudor.Ambarus
2020-10-01 7:34 ` Pratyush Yadav
2020-10-01 7:50 ` Miquel Raynal
2020-10-01 8:18 ` Tudor.Ambarus
2020-10-01 10:50 ` Vignesh Raghavendra
2020-09-30 18:57 ` [PATCH v14 02/15] mtd: spi-nor: add spi_nor_controller_ops_{read_reg, write_reg, erase}() Pratyush Yadav
2020-10-01 7:21 ` [PATCH v14 02/15] mtd: spi-nor: add spi_nor_controller_ops_{read_reg,write_reg,erase}() Tudor.Ambarus
2020-09-30 18:57 ` [PATCH v14 03/15] mtd: spi-nor: add support for DTR protocol Pratyush Yadav
2020-10-01 7:46 ` Tudor.Ambarus
2020-10-01 8:37 ` Pratyush Yadav
2020-10-01 8:49 ` Tudor.Ambarus
2020-09-30 18:57 ` [PATCH v14 04/15] mtd: spi-nor: sfdp: get command opcode extension type from BFPT Pratyush Yadav
2020-09-30 18:57 ` [PATCH v14 05/15] mtd: spi-nor: sfdp: parse xSPI Profile 1.0 table Pratyush Yadav
2020-10-01 7:49 ` Tudor.Ambarus
2020-09-30 18:57 ` [PATCH v14 06/15] mtd: spi-nor: core: use dummy cycle and address width info from SFDP Pratyush Yadav
2020-10-01 7:50 ` Tudor.Ambarus
2020-09-30 18:57 ` [PATCH v14 07/15] mtd: spi-nor: core: do 2 byte reads for SR and FSR in DTR mode Pratyush Yadav
2020-10-01 7:52 ` Tudor.Ambarus
2020-09-30 18:57 ` [PATCH v14 08/15] mtd: spi-nor: core: enable octal DTR mode when possible Pratyush Yadav
2020-10-01 8:09 ` Tudor.Ambarus
2020-10-01 8:42 ` Pratyush Yadav
2020-09-30 18:57 ` [PATCH v14 09/15] mtd: spi-nor: Introduce SNOR_F_IO_MODE_EN_VOLATILE Pratyush Yadav
2020-09-30 18:57 ` [PATCH v14 10/15] mtd: spi-nor: Parse SFDP SCCR Map Pratyush Yadav
2020-10-01 8:20 ` Tudor.Ambarus
2020-10-01 11:56 ` Pratyush Yadav
2020-09-30 18:57 ` [PATCH v14 11/15] mtd: spi-nor: sfdp: detect Soft Reset sequence support from BFPT Pratyush Yadav
2020-10-01 8:21 ` Tudor.Ambarus
2020-09-30 18:57 ` [PATCH v14 12/15] mtd: spi-nor: core: perform a Soft Reset on shutdown Pratyush Yadav
2020-10-01 8:23 ` Tudor.Ambarus [this message]
2020-09-30 18:57 ` [PATCH v14 13/15] mtd: spi-nor: core: disable Octal DTR mode on suspend Pratyush Yadav
2020-10-01 8:26 ` Tudor.Ambarus
2020-09-30 18:57 ` [PATCH v14 14/15] mtd: spi-nor: spansion: add support for Cypress Semper flash Pratyush Yadav
2020-10-01 8:35 ` Tudor.Ambarus
2020-10-01 8:40 ` Pratyush Yadav
2020-10-01 8:50 ` Tudor.Ambarus
2020-09-30 18:57 ` [PATCH v14 15/15] mtd: spi-nor: micron-st: allow using MT35XU512ABA in Octal DTR mode Pratyush Yadav
2020-10-01 8:38 ` Tudor.Ambarus
2020-10-01 19:43 ` Pratyush Yadav
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