From: Miquel Raynal <miquel.raynal@bootlin.com>
To: masonccyang@mxic.com.tw
Cc: mark.rutland@arm.com, christophe.kerello@st.com,
marcel.ziswiler@toradex.com, stefan@agner.ch,
liang.yang@amlogic.com, linux-mtd@lists.infradead.org,
lee.jones@linaro.org, richard@nod.at, marek.vasut@gmail.com,
Boris Brezillon <boris.brezillon@collabora.com>,
geert@linux-m68k.org, devicetree@vger.kernel.org,
robh+dt@kernel.org, bbrezillon@kernel.org, juliensu@mxic.com.tw,
linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org,
paul.burton@mips.com, broonie@kernel.org,
computersforpeace@gmail.com, dwmw2@infradead.org,
zhengxunli@mxic.com.tw
Subject: Re: [PATCH v3 2/4] mtd: rawnand: Add Macronix MX25F0A NAND controller
Date: Wed, 19 Jun 2019 10:09:04 +0200 [thread overview]
Message-ID: <20190619100904.6b759377@xps13> (raw)
In-Reply-To: <OF5EAF94EB.AE31CF59-ON4825841E.002A2C38-4825841E.002C60BF@mxic.com.tw>
Hi Mason,
masonccyang@mxic.com.tw wrote on Wed, 19 Jun 2019 16:04:43 +0800:
> Hi Boris,
>
> >
> > Re: [PATCH v3 2/4] mtd: rawnand: Add Macronix MX25F0A NAND controller
> >
> > On Tue, 18 Jun 2019 08:14:36 +0200
> > Boris Brezillon <boris.brezillon@collabora.com> wrote:
> >
> > > > > > > >
> > > > > > > > How to make all #CS keep high for NAND to enter
> > > > > > > > low-power standby mode if driver don't use
> "legacy.select_chip()"
> > > > ?
> > > > > > >
> > > > > > > See commit 02b4a52604a4 ("mtd: rawnand: Make ->select_chip()
> > > > optional
> > > > > > > when ->exec_op() is implemented") which states:
> > > > > > >
> > > > > > > "When [->select_chip() is] not implemented, the core
> is
> > > > assuming
> > > > > > > the CS line is automatically asserted/deasserted by the
> driver
> > > > > > > ->exec_op() implementation."
> > > > > > >
> > > > > > > Of course, the above is right only when the controller driver
>
> > > > supports
> > > > > > > the ->exec_op() interface.
> > > > > >
> > > > > > Currently, it seems that we will get the incorrect data and
> error
> > > > > > operation due to CS in error toggling if CS line is controlled
> in
> > > > > > ->exec_op().
> >
> > Oh, and please provide the modifications you added on top of this patch.
> > Right now we're speculating on what you've done which is definitely not
> > an efficient way to debug this sort of issues.
>
We really need to see the datasheet of the NAND chip which has a
problem and how this LPM mode is advertized to understand what the
chip expects and eventually how to work-around it.
> The patch is to add in beginning of ->exec_op() to control CS# low and
> before return from ->exec_op() to control CS# High.
> i.e,.
> static in mxic_nand_exec_op( )
> {
> cs_to_low();
>
>
>
> cs_to_high();
> return;
> }
>
> But for nand_onfi_detect(),
> it calls nand_read_param_page_op() and then nand_read_data_op().
> mxic_nand_exec_op() be called twice for nand_onfi_detect()
Yes, this is expected and usually chips don't care.
> and
> driver will get incorrect ONFI parameter table data from
> nand_read_data_op().
>
Thanks,
Miquèl
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http://lists.infradead.org/mailman/listinfo/linux-mtd/
next prev parent reply other threads:[~2019-06-19 8:09 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-15 9:23 [PATCH v3 0/4] Add Macronix MX25F0A MFD driver for raw nand and spi Mason Yang
2019-04-15 9:23 ` [PATCH v3 1/4] mfd: Add Macronix MX25F0A MFD controller driver Mason Yang
2019-05-12 13:08 ` Miquel Raynal
2019-05-15 6:46 ` masonccyang
2019-04-15 9:23 ` [PATCH v3 2/4] mtd: rawnand: Add Macronix MX25F0A NAND controller Mason Yang
2019-05-12 13:18 ` Miquel Raynal
2019-05-15 8:48 ` masonccyang
2019-05-15 12:08 ` Miquel Raynal
[not found] ` <OF8A566F14.A2F0F576-ON482583FB.002E7E32-482583FB.003068B1@LocalDomain>
2019-05-15 9:18 ` masonccyang
2019-05-17 9:30 ` masonccyang
2019-05-20 12:23 ` Miquel Raynal
2019-05-23 8:58 ` masonccyang
2019-05-27 12:42 ` Miquel Raynal
2019-05-29 3:12 ` masonccyang
2019-06-17 12:35 ` Miquel Raynal
2019-06-18 1:24 ` masonccyang
2019-06-18 6:14 ` Boris Brezillon
2019-06-18 7:29 ` Boris Brezillon
2019-06-19 8:04 ` masonccyang
2019-06-19 8:09 ` Miquel Raynal [this message]
2019-06-19 8:48 ` masonccyang
2019-06-24 9:05 ` masonccyang
2019-06-19 8:15 ` Boris Brezillon
2019-06-19 8:55 ` masonccyang
2019-06-19 9:06 ` Boris Brezillon
2019-06-24 8:55 ` masonccyang
2019-04-15 9:23 ` [PATCH v3 3/4] spi: Patch Macronix SPI controller driver according to MX25F0A MFD driver Mason Yang
2019-04-19 14:51 ` Mark Brown
[not found] ` <OF7742B4A9.445066F6-ON482583EC.0037E377-482583EC.0039125B@mxic.com.tw>
2019-05-02 2:41 ` Mark Brown
2019-04-15 9:23 ` [PATCH v3 4/4] dt-bindings: mfd: Document Macronix MX25F0A controller bindings Mason Yang
2019-04-26 22:41 ` Rob Herring
2019-05-12 13:23 ` Miquel Raynal
2019-05-15 7:36 ` masonccyang
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