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From: Pratyush Yadav
To: Jagan Teki , Vignesh Raghavendra
CC: Pratyush Yadav , , Sekhar Nori
Subject: [PATCH 14/15] mtd: spi-nor-core: Enable octal DTR mode when possible
Date: Wed, 26 Feb 2020 18:26:04 +0530
Message-ID: <20200226125606.22684-15-p.yadav@ti.com>
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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
---
drivers/mtd/spi/spi-nor-core.c | 31 +++++++++++++++++++++++++++++++
include/linux/mtd/spi-nor.h | 2 ++
2 files changed, 33 insertions(+)
diff --git a/drivers/mtd/spi/spi-nor-core.c b/drivers/mtd/spi/spi-nor-core.c
index 6802fb625b..d9b381fe36 100644
--- a/drivers/mtd/spi/spi-nor-core.c
+++ b/drivers/mtd/spi/spi-nor-core.c
@@ -2597,10 +2597,41 @@ static int spi_nor_setup(struct spi_nor *nor, const struct flash_info *info,
return nor->setup(nor, info, params, hwcaps);
}
+/** 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->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->octal_dtr_enable(nor);
+ if (ret)
+ return ret;
+
+ nor->reg_proto = SNOR_PROTO_8_8_8_DTR;
+
+ return 0;
+}
+
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 DTR mode not supported\n");
+ return err;
+ }
+
/*
* Atmel, SST, Intel/Numonyx, and others serial NOR tend to power up
* with the software protection bits set
diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
index 1c076fc7f2..b397a19ccf 100644
--- a/include/linux/mtd/spi-nor.h
+++ b/include/linux/mtd/spi-nor.h
@@ -441,6 +441,7 @@ struct flash_info;
* @flash_is_locked: [FLASH-SPECIFIC] check if a region of the SPI NOR is
* @quad_enable: [FLASH-SPECIFIC] enables SPI NOR quad mode
* completely locked
+ * @octal_dtr_enable: [FLASH-SPECIFIC] enables SPI NOR octal DTR mode.
* @priv: the private data
*/
struct spi_nor {
@@ -488,6 +489,7 @@ struct spi_nor {
int (*flash_unlock)(struct spi_nor *nor, loff_t ofs, uint64_t len);
int (*flash_is_locked)(struct spi_nor *nor, loff_t ofs, uint64_t len);
int (*quad_enable)(struct spi_nor *nor);
+ int (*octal_dtr_enable)(struct spi_nor *nor);
void *priv;
/* Compatibility for spi_flash, remove once sf layer is merged with mtd */