From: masonccyang@mxic.com.tw
To: "Boris Brezillon" <boris.brezillon@collabora.com>
Cc: richard@nod.at, bbrezillon@kernel.org, juliensu@mxic.com.tw,
gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org,
frieder.schrempf@kontron.de, marcel.ziswiler@toradex.com,
linux-mtd@lists.infradead.org,
Miquel Raynal <miquel.raynal@bootlin.com>,
tglx@linutronix.de, computersforpeace@gmail.com,
dwmw2@infradead.org, marek.vasut@gmail.com, vigneshr@ti.com
Subject: Re: [PATCH RFC 3/3] mtd: rawnand: Add support Macronix power down mode
Date: Fri, 25 Oct 2019 11:11:13 +0800 [thread overview]
Message-ID: <OFDC1EA65D.196421DA-ON4825849E.000FBB73-4825849E.001181F2@mxic.com.tw> (raw)
In-Reply-To: <20191008092832.54492696@dhcp-172-31-174-146.wireless.concordia.ca>
Hi Boris,
>
> Subject
>
> Re: [PATCH RFC 3/3] mtd: rawnand: Add support Macronix power down mode
>
> On Tue, 8 Oct 2019 10:06:50 +0800
> masonccyang@mxic.com.tw wrote:
>
> > > > + nand_select_target(chip, 0);
> > >
> > > On several NAND controllers there is no way to act on the CS line
> > > without actually writing bytes to the NAND chip. So basically this
> > > is very likely to not work.
> >
> > any other way to make it work ? GPIO ?
> > or just have some comments description here.
> > i.e,.
> >
> > /* The NAND chip will exit the deep power down mode with #CS toggling,
> > * please refer to datasheet for the timing requirement of tCRDP and
tRDP.
> > */
> >
>
> Good luck with that. As Miquel said, on most NAND controllers
> select_target() is a dummy operation that just assigns nand_chip->target
> to the specified value but doesn't assert the CS line. You could send a
> dummy command here, like a READ_ID, but I guess you need CS to be
> asserted for at least 20ns before asserting any other signals (CLE/ALE)
> which might be an issue.
>
I have validated & checked w/ designer that NANDs device just need CS#
line
toggling and don't care of CLE/WE#/RE#. That is raw NAND controller
sending
a command nand_status_op() or nand_power_down_op() will exit the deep
power down too. The first command(just CS# line toggling) to NAND device
in deep power down mode will not be recognized. We may publish the
application notes or update the datasheet later.
thanks & best regards,
Mason
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prev parent reply other threads:[~2019-10-25 3:12 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-18 7:56 [PATCH RFC 1/3] mtd: rawnand: Add support manufacturer postponed initialization Mason Yang
2019-09-18 7:56 ` [PATCH RFC 2/3] mtd: rawnand: Add support Macronix Block Protection function Mason Yang
2019-10-07 8:45 ` Miquel Raynal
2019-10-07 9:24 ` Miquel Raynal
2019-10-08 2:33 ` masonccyang
2019-10-08 15:02 ` Miquel Raynal
2019-10-15 6:47 ` masonccyang
[not found] ` <OFB4F10613.467EB346-ON48258494.0020403E-48258494.002550A2@LocalDomain>
2019-10-21 7:23 ` masonccyang
2019-10-21 7:44 ` Boris Brezillon
2019-10-21 8:40 ` masonccyang
2019-10-21 8:56 ` Boris Brezillon
2019-10-21 9:07 ` masonccyang
2019-09-18 7:56 ` [PATCH RFC 3/3] mtd: rawnand: Add support Macronix power down mode Mason Yang
2019-10-07 8:45 ` Miquel Raynal
2019-10-08 2:06 ` masonccyang
2019-10-08 7:28 ` Boris Brezillon
2019-10-15 2:33 ` masonccyang
2019-10-15 7:56 ` Miquel Raynal
2019-10-16 6:55 ` masonccyang
2019-10-25 3:11 ` masonccyang [this message]
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