From: Miquel Raynal <miquel.raynal@bootlin.com>
To: <patrice.chotard@foss.st.com>
Cc: Mark Brown <broonie@kernel.org>,
Vignesh Raghavendra <vigneshr@ti.com>,
Boris Brezillon <boris.brezillon@collabora.com>,
<linux-mtd@lists.infradead.org>,
Alexandre Torgue <alexandre.torgue@foss.st.com>,
<linux-spi@vger.kernel.org>,
<linux-stm32@st-md-mailman.stormreply.com>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, <christophe.kerello@foss.st.com>,
Pratyush Yadav <p.yadav@ti.com>
Subject: Re: [PATCH v3 3/3] mtd: spinand: add SPI-NAND MTD resume handler
Date: Thu, 27 May 2021 18:23:17 +0200 [thread overview]
Message-ID: <20210527182317.38d5edc6@xps13> (raw)
In-Reply-To: <20210527161252.16620-4-patrice.chotard@foss.st.com>
Hi Patrice,
+ Pratyush
<patrice.chotard@foss.st.com> wrote on Thu, 27 May 2021 18:12:52 +0200:
> From: Patrice Chotard <patrice.chotard@foss.st.com>
>
> 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>
> ---
> Changes in v3:
> - Add spinand_read_cfg() call to repopulate cache
>
> Changes in v2:
> - Add helper spinand_block_unlock().
> - Add spinand_ecc_enable() call.
> - Remove some dev_err().
> - Fix commit's title and message.
>
> drivers/mtd/nand/spi/core.c | 33 +++++++++++++++++++++++++++++++++
> 1 file changed, 33 insertions(+)
>
> diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c
> index 1f699ad84f1b..e3fcbcf381c3 100644
> --- a/drivers/mtd/nand/spi/core.c
> +++ b/drivers/mtd/nand/spi/core.c
> @@ -1099,6 +1099,38 @@ static int spinand_block_unlock(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_read_cfg(spinand);
> + if (ret)
> + return;
> +
> + ret = spinand_init_quad_enable(spinand);
> + if (ret)
> + return;
> +
> + ret = spinand_upd_cfg(spinand, CFG_OTP_ENABLE, 0);
> + if (ret)
> + return;
> +
> + ret = spinand_manufacturer_init(spinand);
> + if (ret)
> + return;
> +
> + ret = spinand_block_unlock(spinand);
> + if (ret)
> + return;
> +
> + spinand_ecc_enable(spinand, false);
> +}
Sorry for not being clear, but I think what Pratyush meant was that
you could create a helper doing all the common initializations between
spinand_init() and spinand_resume() and call it from these places to
avoid code duplication. His comment somehow outclassed mine as I only
focused on the unlock part (which I think is clearer anyway, please keep
it like that).
> +
> static int spinand_init(struct spinand_device *spinand)
> {
> struct device *dev = &spinand->spimem->spi->dev;
> @@ -1186,6 +1218,7 @@ 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);
Thanks,
Miquèl
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next prev parent reply other threads:[~2021-05-27 18:01 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-27 16:12 [PATCH v3 0/3] mtd: spinand: add SPI-NAND MTD resume handler patrice.chotard
2021-05-27 16:12 ` [PATCH v3 1/3] mtd: spinand: Add spinand_block_unlock() helper patrice.chotard
2021-05-27 16:12 ` [PATCH v3 2/3] mtd: spinand: add spinand_read_cfg() helper patrice.chotard
2021-05-27 16:12 ` [PATCH v3 3/3] mtd: spinand: add SPI-NAND MTD resume handler patrice.chotard
2021-05-27 16:23 ` Miquel Raynal [this message]
2021-05-28 8:22 ` Patrice CHOTARD
2021-05-28 12:05 ` Pratyush Yadav
2021-05-28 12:51 ` Patrice CHOTARD
2021-05-28 13:17 ` Pratyush Yadav
2021-05-28 14:31 ` Patrice CHOTARD
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