lkml.org 
[lkml]   [2020]   [May]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v3 11/14] mtd: spi-nor: core: enable octal DTR mode when possible
Date
From: Pratyush Yadav <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/core.c | 35 +++++++++++++++++++++++++++++++++++
drivers/mtd/spi-nor/core.h | 2 ++
2 files changed, 37 insertions(+)

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index cbfdf544..a353830 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -3162,6 +3162,35 @@ static int spi_nor_init_params(struct spi_nor *nor)
return 0;
}

+/** spi_nor_octal_dtr_enable() - enable Octal DTR I/O if needed
+ * @nor: pointer to a 'struct spi_nor'
+ * @enable: whether to enable or disable Octal DTR
+ *
+ * Return: 0 on success, -errno otherwise.
+ */
+static int spi_nor_octal_dtr_enable(struct spi_nor *nor, bool enable)
+{
+ int ret;
+
+ if (!nor->params->octal_dtr_enable)
+ return 0;
+
+ if (!(nor->read_proto == SNOR_PROTO_8_8_8_DTR &&
+ nor->write_proto == SNOR_PROTO_8_8_8_DTR))
+ return 0;
+
+ ret = nor->params->octal_dtr_enable(nor, enable);
+ if (ret)
+ return ret;
+
+ if (enable)
+ nor->reg_proto = SNOR_PROTO_8_8_8_DTR;
+ else
+ nor->reg_proto = SNOR_PROTO_1_1_1;
+
+ return 0;
+}
+
/**
* spi_nor_quad_enable() - enable Quad I/O if needed.
* @nor: pointer to a 'struct spi_nor'
@@ -3201,6 +3230,12 @@ static int spi_nor_init(struct spi_nor *nor)
{
int err;

+ err = spi_nor_octal_dtr_enable(nor, true);
+ 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/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h
index 91bc69a..9b0e0ba 100644
--- a/drivers/mtd/spi-nor/core.h
+++ b/drivers/mtd/spi-nor/core.h
@@ -223,6 +223,7 @@ struct cmd_seq_octal_dtr {
* @erase_map: the erase map parsed from the SFDP Sector Map Parameter
* Table.
* @cmd_seq: command sequence to change to octal DTR mode.
+ * @octal_dtr_enable: enables SPI NOR octal DTR mode.
* @quad_enable: enables SPI NOR quad mode.
* @set_4byte_addr_mode: puts the SPI NOR in 4 byte addressing mode.
* @convert_addr: converts an absolute address into something the flash
@@ -252,6 +253,7 @@ struct spi_nor_flash_parameter {

struct cmd_seq_octal_dtr cmd_seq[4];

+ int (*octal_dtr_enable)(struct spi_nor *nor, bool enable);
int (*quad_enable)(struct spi_nor *nor);
int (*set_4byte_addr_mode)(struct spi_nor *nor, bool enable);
u32 (*convert_addr)(struct spi_nor *nor, u32 addr);
--
1.9.1
\
 
 \ /
  Last update: 2020-05-28 10:01    [W:0.084 / U:0.464 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site