From: Pratyush Yadav <p.yadav@ti.com>
To: <Tudor.Ambarus@microchip.com>
Cc: vigneshr@ti.com, richard@nod.at, nsekhar@ti.com,
linux-kernel@vger.kernel.org, boris.brezillon@collabora.com,
linux-mtd@lists.infradead.org, miquel.raynal@bootlin.com
Subject: Re: [PATCH v13 09/15] mtd: spi-nor: core: enable octal DTR mode when possible
Date: Tue, 29 Sep 2020 18:21:33 +0530 [thread overview]
Message-ID: <20200929125131.fmztz4rr2iuj6uof@ti.com> (raw)
In-Reply-To: <feb046fd-a9ea-9ea3-55f7-bf823ed1e61f@microchip.com>
On 29/09/20 11:26AM, Tudor.Ambarus@microchip.com wrote:
> Hi,
>
> On 9/16/20 3:44 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 87c568debf14..6ee93544d72f 100644
> > --- a/drivers/mtd/spi-nor/core.c
> > +++ b/drivers/mtd/spi-nor/core.c
> > @@ -3069,6 +3069,35 @@ 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/disable Quad I/O if needed.
> > * @nor: pointer to a 'struct spi_nor'
> > @@ -3109,6 +3138,12 @@ 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, true);
>
> Is it possible to enable octal dtr and quad at the same time?
> Maybe an 'if/else if' here depending on the values of nor->read_proto and
> nor->write_proto
No it is not. If you look inside spi_nor_octal_dtr_enable() and
spi_nor_quad_enable(), they both are a no-op if the protocol does not
match. spi_nor_quad_enable() was already doing it this way so I made
spi_nor_octal_dtr_enable() follow suit. So this is effectively an
if-else on the value of nor->read_proto. I don't think an explicit one
is needed.
--
Regards,
Pratyush Yadav
Texas Instruments India
______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/
next prev parent reply other threads:[~2020-09-29 12:52 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-16 12:44 [PATCH v13 00/15] mtd: spi-nor: add xSPI Octal DTR support Pratyush Yadav
2020-09-16 12:44 ` [PATCH v13 01/15] mtd: spi-nor: core: use EOPNOTSUPP instead of ENOTSUPP Pratyush Yadav
2020-09-29 11:30 ` Tudor.Ambarus
2020-09-16 12:44 ` [PATCH v13 02/15] mtd: spi-nor: core: add spi_nor_{read, write}_reg() helpers Pratyush Yadav
2020-09-29 11:38 ` [PATCH v13 02/15] mtd: spi-nor: core: add spi_nor_{read,write}_reg() helpers Tudor.Ambarus
2020-09-29 12:54 ` Pratyush Yadav
2020-09-16 12:44 ` [PATCH v13 03/15] mtd: spi-nor: core: add spi_nor_controller_ops_erase helper Pratyush Yadav
2020-09-16 12:44 ` [PATCH v13 04/15] mtd: spi-nor: add support for DTR protocol Pratyush Yadav
2020-09-16 12:44 ` [PATCH v13 05/15] mtd: spi-nor: sfdp: get command opcode extension type from BFPT Pratyush Yadav
2020-09-30 6:17 ` Tudor.Ambarus
2020-09-16 12:44 ` [PATCH v13 06/15] mtd: spi-nor: sfdp: parse xSPI Profile 1.0 table Pratyush Yadav
2020-09-30 6:44 ` Tudor.Ambarus
2020-09-30 6:53 ` Pratyush Yadav
2020-09-16 12:44 ` [PATCH v13 07/15] mtd: spi-nor: core: use dummy cycle and address width info from SFDP Pratyush Yadav
2020-09-30 6:46 ` Tudor.Ambarus
2020-09-16 12:44 ` [PATCH v13 08/15] mtd: spi-nor: core: do 2 byte reads for SR and FSR in DTR mode Pratyush Yadav
2020-09-30 6:50 ` Tudor.Ambarus
2020-09-30 6:55 ` Pratyush Yadav
2020-09-16 12:44 ` [PATCH v13 09/15] mtd: spi-nor: core: enable octal DTR mode when possible Pratyush Yadav
2020-09-29 11:26 ` Tudor.Ambarus
2020-09-29 12:51 ` Pratyush Yadav [this message]
2020-09-29 13:05 ` Tudor.Ambarus
2020-09-30 7:11 ` Tudor.Ambarus
2020-09-16 12:44 ` [PATCH v13 10/15] mtd: spi-nor: sfdp: detect Soft Reset sequence support from BFPT Pratyush Yadav
2020-09-30 7:23 ` Tudor.Ambarus
2020-09-30 7:31 ` Pratyush Yadav
2020-09-16 12:44 ` [PATCH v13 11/15] mtd: spi-nor: core: perform a Soft Reset on shutdown Pratyush Yadav
2020-09-29 13:08 ` Pratyush Yadav
2020-09-30 7:32 ` Tudor.Ambarus
2020-09-30 7:43 ` Pratyush Yadav
2020-09-16 12:44 ` [PATCH v13 12/15] mtd: spi-nor: core: disable Octal DTR mode on suspend Pratyush Yadav
2020-09-30 7:40 ` Tudor.Ambarus
2020-09-30 7:44 ` Pratyush Yadav
2020-09-16 12:44 ` [PATCH v13 13/15] mtd: spi-nor: core: expose spi_nor_default_setup() in core.h Pratyush Yadav
2020-09-30 7:51 ` Tudor.Ambarus
2020-09-30 8:03 ` Pratyush Yadav
2020-09-16 12:44 ` [PATCH v13 14/15] mtd: spi-nor: spansion: add support for Cypress Semper flash Pratyush Yadav
2020-09-30 8:36 ` Tudor.Ambarus
2020-09-30 12:32 ` Pratyush Yadav
2020-09-16 12:44 ` [PATCH v13 15/15] mtd: spi-nor: micron-st: allow using MT35XU512ABA in Octal DTR mode Pratyush Yadav
2020-09-30 9:12 ` Tudor.Ambarus
2020-09-29 9:59 ` [RFC PATCH 0/3] mtd: spi-nor: Tackle stateful modes Tudor Ambarus
2020-09-29 9:59 ` [RFC PATCH 1/3] mtd: spi-nor: Introduce SNOR_F_IO_MODE_EN_VOLATILE Tudor Ambarus
2020-09-29 16:45 ` Vignesh Raghavendra
2020-09-29 9:59 ` [RFC PATCH 2/3] mtd: spi-nor: Introduce MTD_SPI_NOR_ALLOW_STATEFUL_MODES Tudor Ambarus
2020-09-29 16:45 ` Vignesh Raghavendra
2020-09-29 9:59 ` [RFC PATCH 3/3] mtd: spi-nor: Parse SFDP SCCR Map Tudor Ambarus
2020-09-30 9:57 ` [PATCH v13 00/15] mtd: spi-nor: add xSPI Octal DTR support Tudor.Ambarus
2020-09-30 12:01 ` Pratyush Yadav
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200929125131.fmztz4rr2iuj6uof@ti.com \
--to=p.yadav@ti.com \
--cc=Tudor.Ambarus@microchip.com \
--cc=boris.brezillon@collabora.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mtd@lists.infradead.org \
--cc=miquel.raynal@bootlin.com \
--cc=nsekhar@ti.com \
--cc=richard@nod.at \
--cc=vigneshr@ti.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).