Messages in this thread |  | | From | <> | Subject | Re: [PATCH v14 08/15] mtd: spi-nor: core: enable octal DTR mode when possible | Date | Thu, 1 Oct 2020 08:09:14 +0000 |
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On 9/30/20 9:57 PM, Pratyush Yadav wrote: > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe > > 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 73a26e7e32c2..6b54a923002a 100644 > --- a/drivers/mtd/spi-nor/core.c > +++ b/drivers/mtd/spi-nor/core.c > @@ -3068,6 +3068,35 @@ 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);
Ideally patch 9/15 and 10/15 should have been before 8/15. We should deny the access to octal dtr enable for NV flashes since moment 0.
> + 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' > @@ -3107,6 +3136,12 @@ 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 9a33c8d07335..5cfe2db9ee13 100644 > --- a/drivers/mtd/spi-nor/core.h > +++ b/drivers/mtd/spi-nor/core.h > @@ -203,6 +203,7 @@ 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_addr_mode: puts the SPI NOR in 4 byte addressing mode. > * @convert_addr: converts an absolute address into something the flash > @@ -226,6 +227,7 @@ struct spi_nor_flash_parameter { > > struct spi_nor_erase_map erase_map; > > + 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); > -- > 2.28.0 >
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