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From: masonccyang@mxic.com.tw
To: "Boris Brezillon" <boris.brezillon@collabora.com>
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,
	Miquel Raynal <miquel.raynal@bootlin.com>,
	lee.jones@linaro.org, richard@nod.at, marek.vasut@gmail.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 16:04:43 +0800
Message-ID: <OF5EAF94EB.AE31CF59-ON4825841E.002A2C38-4825841E.002C60BF@mxic.com.tw> (raw)
In-Reply-To: <20190618092901.3bdd9f61@collabora.com>


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.

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() and
driver will get incorrect ONFI parameter table data from 
nand_read_data_op().

thanks & best regards,
Mason










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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 [this message]
2019-06-19  8:09                         ` Miquel Raynal
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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