From: Apurva Nandan <a-nandan@ti.com>
To: Miquel Raynal <miquel.raynal@bootlin.com>,
Richard Weinberger <richard@nod.at>,
Vignesh Raghavendra <vigneshr@ti.com>,
Mark Brown <broonie@kernel.org>, Apurva Nandan <a-nandan@ti.com>,
Patrice Chotard <patrice.chotard@foss.st.com>,
Christophe Kerello <christophe.kerello@foss.st.com>,
Boris Brezillon <boris.brezillon@collabora.com>,
<linux-mtd@lists.infradead.org>, <linux-kernel@vger.kernel.org>,
<linux-spi@vger.kernel.org>
Cc: <p.yadav@ti.com>
Subject: [PATCH v2 11/14] mtd: spinand: Perform Power-on-Reset on the flash in mtd_suspend()
Date: Tue, 12 Oct 2021 02:16:16 +0530 [thread overview]
Message-ID: <20211011204619.81893-12-a-nandan@ti.com> (raw)
In-Reply-To: <20211011204619.81893-1-a-nandan@ti.com>
A soft reset using FFh command doesn't erase the flash's configuration
and doesn't reset the SPI IO mode also. This can result in the flash
being in a different SPI IO mode, e.g. Octal DTR, when resuming from
sleep. This could put the flash in an unrecognized SPI IO mode, making
it unusable.
Perform a Power-on-Reset (PoR), if available in the flash, when
performing mtd_suspend(). This would set the flash to clean
state for reinitialization during resume and would also ensure that it
is in standard SPI IO mode (1S-1S-1S) before the resume begins.
Signed-off-by: Apurva Nandan <a-nandan@ti.com>
---
drivers/mtd/nand/spi/core.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c
index 9b570570ee81..60408531979a 100644
--- a/drivers/mtd/nand/spi/core.c
+++ b/drivers/mtd/nand/spi/core.c
@@ -1316,6 +1316,11 @@ static void spinand_mtd_resume(struct mtd_info *mtd)
int ret;
spinand->reg_proto = SPINAND_SINGLE_STR;
+ /*
+ * PoR Reset (if available by the manufacturer) is performed at the suspend
+ * time. Hence, those flashes remain in power-on-state at this point, in a
+ * standard SPI IO mode. So, now the core unanimously performs a soft reset.
+ */
ret = spinand_reset_op(spinand);
if (ret)
return;
@@ -1327,6 +1332,21 @@ static void spinand_mtd_resume(struct mtd_info *mtd)
spinand_ecc_enable(spinand, false);
}
+static int spinand_mtd_suspend(struct mtd_info *mtd)
+{
+ struct spinand_device *spinand = mtd_to_spinand(mtd);
+ int ret;
+
+ if (!(spinand->flags & SPINAND_HAS_POR_CMD_BIT))
+ return 0;
+
+ ret = spinand_power_on_rst_op(spinand);
+ if (ret)
+ dev_err(&spinand->spimem->spi->dev, "suspend() failed\n");
+
+ return ret;
+}
+
static int spinand_init(struct spinand_device *spinand)
{
struct device *dev = &spinand->spimem->spi->dev;
@@ -1399,6 +1419,7 @@ static int spinand_init(struct spinand_device *spinand)
mtd->_erase = spinand_mtd_erase;
mtd->_max_bad_blocks = nanddev_mtd_max_bad_blocks;
mtd->_resume = spinand_mtd_resume;
+ mtd->_suspend = spinand_mtd_suspend;
if (nand->ecc.engine) {
ret = mtd_ooblayout_count_freebytes(mtd);
--
2.25.1
next prev parent reply other threads:[~2021-10-11 21:40 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-11 20:46 [PATCH v2 00/14] mtd: spinand: Add Octal DTR SPI (8D-8D-8D) mode support Apurva Nandan
2021-10-11 20:46 ` [PATCH v2 01/14] spi: spi-mem: Add DTR templates for cmd, address, dummy and data phase Apurva Nandan
2021-10-11 20:46 ` [PATCH v2 02/14] mtd: spinand: Add enum spinand_proto to indicate current SPI IO mode Apurva Nandan
2021-10-12 6:39 ` Boris Brezillon
2021-10-11 20:46 ` [PATCH v2 03/14] mtd: spinand: Patch spi_mem_op for the SPI IO protocol using reg_proto Apurva Nandan
2021-10-12 6:40 ` Boris Brezillon
2021-10-11 20:46 ` [PATCH v2 04/14] mtd: spinand: Fix odd byte addr and data phase in read and write reg op for Octal DTR mode Apurva Nandan
2021-10-11 20:46 ` [PATCH v2 05/14] mtd: spinand: Add adjust_op() in manufacturer_ops to modify the ops for manufacturer specific changes Apurva Nandan
2021-10-12 6:54 ` Boris Brezillon
2021-10-11 20:46 ` [PATCH v2 06/14] mtd: spinand: Add macros for Octal DTR page read and write operations Apurva Nandan
2021-10-11 20:46 ` [PATCH v2 07/14] mtd: spinand: Allow enabling Octal DTR mode in the core Apurva Nandan
2021-10-12 7:14 ` Boris Brezillon
2021-10-11 20:46 ` [PATCH v2 08/14] mtd: spinand: winbond: Add support for write volatile configuration register op Apurva Nandan
2021-10-11 20:46 ` [PATCH v2 09/14] mtd: spinand: winbond: Add octal_dtr_enable() for manufacturer_ops Apurva Nandan
2021-10-11 20:46 ` [PATCH v2 10/14] mtd: spinand: Add support for Power-on-Reset (PoR) instruction Apurva Nandan
2021-10-11 20:46 ` Apurva Nandan [this message]
2021-10-12 7:25 ` [PATCH v2 11/14] mtd: spinand: Perform Power-on-Reset on the flash in mtd_suspend() Boris Brezillon
2021-10-11 20:46 ` [PATCH v2 12/14] mtd: spinand: Add adjust_op() in Winbond manufacturer_ops Apurva Nandan
2021-10-11 20:46 ` [PATCH v2 13/14] mtd: spinand: winbond: Rename cache op_variants struct variable Apurva Nandan
2021-10-11 20:46 ` [PATCH v2 14/14] mtd: spinand: winbond: Add support for Winbond W35N01JW SPI NAND flash Apurva Nandan
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