From: Pratyush Yadav <p.yadav@ti.com>
To: Tudor Ambarus <tudor.ambarus@microchip.com>,
Miquel Raynal <miquel.raynal@bootlin.com>,
Richard Weinberger <richard@nod.at>,
Vignesh Raghavendra <vigneshr@ti.com>,
Mark Brown <broonie@kernel.org>
Cc: Sekhar Nori <nsekhar@ti.com>,
linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org,
Pratyush Yadav <p.yadav@ti.com>,
linux-spi@vger.kernel.org
Subject: [PATCH 8/9] mtd: spi-nor: enable octal DTR mode when possible
Date: Tue, 11 Feb 2020 19:03:47 +0530 [thread overview]
Message-ID: <20200211133348.15558-9-p.yadav@ti.com> (raw)
In-Reply-To: <20200211133348.15558-1-p.yadav@ti.com>
Allow flashes to specify a hook to enable octal DTR mode. Use this hook
whenever possible to get optimal transfer speeds.
Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
---
drivers/mtd/spi-nor/spi-nor.c | 31 +++++++++++++++++++++++++++++++
include/linux/mtd/spi-nor.h | 2 ++
2 files changed, 33 insertions(+)
diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 8c5d7bfa4f16..78e3475fa2a9 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -5184,6 +5184,31 @@ static void spi_nor_init_params(struct spi_nor *nor)
spi_nor_late_init_params(nor);
}
+/** spi_nor_octal_dtr_enable() - enable Octal DTR I/O if needed
+ * @nor: pointer to a 'struct spi_nor'
+ *
+ * Return: 0 on success, -errno otherwise.
+ */
+static int spi_nor_octal_dtr_enable(struct spi_nor *nor)
+{
+ int ret;
+
+ if (!nor->params.octal_dtr_enable)
+ return 0;
+
+ if (!(spi_nor_get_protocol_width(nor->read_proto) == 8 ||
+ spi_nor_get_protocol_width(nor->write_proto) == 8))
+ return 0;
+
+ ret = nor->params.octal_dtr_enable(nor);
+ if (ret)
+ return ret;
+
+ nor->reg_proto = SNOR_PROTO_8_8_8_DTR;
+
+ return 0;
+}
+
/**
* spi_nor_quad_enable() - enable Quad I/O if needed.
* @nor: pointer to a 'struct spi_nor'
@@ -5223,6 +5248,12 @@ static int spi_nor_init(struct spi_nor *nor)
{
int err;
+ err = spi_nor_octal_dtr_enable(nor);
+ if (err) {
+ dev_dbg(nor->dev, "octal mode not supported\n");
+ return err;
+ }
+
err = spi_nor_quad_enable(nor);
if (err) {
dev_dbg(nor->dev, "quad mode not supported\n");
diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
index f54dbd0f86ab..c653f6713cfc 100644
--- a/include/linux/mtd/spi-nor.h
+++ b/include/linux/mtd/spi-nor.h
@@ -526,6 +526,7 @@ struct spi_nor_locking_ops {
* higher index in the array, the higher priority.
* @erase_map: the erase map parsed from the SFDP Sector Map Parameter
* Table.
+ * @octal_dtr_enable: enables SPI NOR octal DTR mode.
* @quad_enable: enables SPI NOR quad mode.
* @set_4byte: puts the SPI NOR in 4 byte addressing mode.
* @convert_addr: converts an absolute address into something the flash
@@ -549,6 +550,7 @@ struct spi_nor_flash_parameter {
struct spi_nor_erase_map erase_map;
+ int (*octal_dtr_enable)(struct spi_nor *nor);
int (*quad_enable)(struct spi_nor *nor);
int (*set_4byte)(struct spi_nor *nor, bool enable);
u32 (*convert_addr)(struct spi_nor *nor, u32 addr);
--
2.25.0
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next prev parent reply other threads:[~2020-02-11 13:36 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-11 13:33 [PATCH 0/9] mtd: spi-nor: add xSPI Octal DTR support Pratyush Yadav
2020-02-11 13:33 ` [PATCH 1/9] spi: spi-mem: allow specifying whether an op is DTR or not Pratyush Yadav
2020-02-11 13:33 ` [PATCH 2/9] spi: spi-mem: allow specifying a command's extension Pratyush Yadav
2020-02-11 13:33 ` [PATCH 3/9] spi: cadence-quadspi: Add support for octal DTR flashes Pratyush Yadav
2020-02-11 13:33 ` [PATCH 4/9] mtd: spi-nor: add support for DTR protocol Pratyush Yadav
2020-02-11 13:33 ` [PATCH 5/9] mtd: spi-nor: get command opcode extension type from BFPT Pratyush Yadav
2020-02-11 13:33 ` [PATCH 6/9] mtd: spi-nor: parse xSPI Profile 1.0 table Pratyush Yadav
2020-02-11 13:33 ` [PATCH 7/9] mtd: spi-nor: use dummy cycle and address width info from SFDP Pratyush Yadav
2020-02-11 13:33 ` Pratyush Yadav [this message]
2020-02-11 13:33 ` [PATCH 9/9] mtd: spi-nor: add support for Cypress Semper flash Pratyush Yadav
2020-02-13 10:36 ` [EXT] " Kuldeep Singh
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