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From: Miquel Raynal <miquel.raynal@bootlin.com>
To: Naga Sureshkumar Relli <nagasure@xilinx.com>
Cc: Boris Brezillon <boris.brezillon@bootlin.com>,
	"robh@kernel.org" <robh@kernel.org>,
	"richard@nod.at" <richard@nod.at>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"marek.vasut@gmail.com" <marek.vasut@gmail.com>,
	"linux-mtd@lists.infradead.org" <linux-mtd@lists.infradead.org>,
	"nagasuresh12@gmail.com" <nagasuresh12@gmail.com>,
	Michal Simek <michals@xilinx.com>,
	"computersforpeace@gmail.com" <computersforpeace@gmail.com>,
	"dwmw2@infradead.org" <dwmw2@infradead.org>
Subject: Re: [LINUX PATCH v12 3/3] mtd: rawnand: arasan: Add support for Arasan NAND Flash Controller
Date: Mon, 17 Dec 2018 17:41:14 +0100	[thread overview]
Message-ID: <20181217174114.24196d17@xps13> (raw)
In-Reply-To: <MWHPR02MB26235AE6567A06EF4C6362E6AFBC0@MWHPR02MB2623.namprd02.prod.outlook.com>

Hi Naga,

[...]

> Inserted biterror @ 48/7
> Successfully corrected 25 bit errors per subpage
> Inserted biterror @ 50/7
> ECC failure, invalid data despite read success
> root@xilinx-zc1751-dc2-2018_1:~#
> 
> But even in this case also, driver is saying ECC failure but read success.
> That means controller is able to detect errors on read page up to 24 bit only.
> After that there is no way to say to the upper layers that the page is bad because of the limitation in the controller.

This is more than a "limitation", the design is broken. I am not sure
how to support such controller, and I am not sure if we even want to.

> Could you please suggest any alternative to report the errors in that case?

Shall we support the controller without the hw ECC engine? Boris, any
thoughts?


Thanks,
Miquèl

  reply	other threads:[~2018-12-17 16:41 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-09  5:00 [LINUX PATCH v12 0/3] Add support for Arasan NAND Flash controller Naga Sureshkumar Relli
2018-11-09  5:00 ` [LINUX PATCH v12 1/3] dt-bindings: mtd: arasan: Add device tree binding documentation Naga Sureshkumar Relli
2018-11-09  6:28   ` Boris Brezillon
2018-11-09 12:33     ` Naga Sureshkumar Relli
2018-11-09 12:54       ` Miquel Raynal
2018-11-09 13:19         ` Naga Sureshkumar Relli
2018-11-16 11:50   ` Martin Lund
2018-11-16 12:10     ` Martin Lund
2018-11-16 12:33     ` Michal Simek
2018-11-16 13:50       ` Naga Sureshkumar Relli
2018-11-16 14:22         ` Martin Lund
2018-11-09  5:00 ` [LINUX PATCH v12 2/3] mtd: rawnand: Add an option to get sdr timing mode number Naga Sureshkumar Relli
2018-11-09  5:00 ` [LINUX PATCH v12 3/3] mtd: rawnand: arasan: Add support for Arasan NAND Flash Controller Naga Sureshkumar Relli
2018-11-09  8:07   ` Boris Brezillon
2018-11-09 13:18     ` Naga Sureshkumar Relli
2018-11-09 23:03   ` kbuild test robot
2018-11-12 10:55   ` Martin Lund
2018-11-12 10:58     ` Boris Brezillon
2018-11-12 12:43       ` Naga Sureshkumar Relli
2018-11-15  9:34   ` Naga Sureshkumar Relli
2018-11-18 18:52     ` Miquel Raynal
2018-11-18 19:43     ` Boris Brezillon
2018-11-19  6:20       ` Naga Sureshkumar Relli
2018-11-19  8:02         ` Boris Brezillon
2018-11-20  7:02           ` Naga Sureshkumar Relli
2018-11-20 11:02             ` Boris Brezillon
2018-11-20 12:36               ` Miquel Raynal
2018-11-23 13:53                 ` Naga Sureshkumar Relli
2018-12-12  5:27                   ` Naga Sureshkumar Relli
2018-12-12  8:11                     ` Miquel Raynal
2018-12-12  9:04                       ` Naga Sureshkumar Relli
2018-12-12  9:09                         ` Miquel Raynal
2018-12-12 13:07                           ` Naga Sureshkumar Relli
2018-12-12 13:18                             ` Miquel Raynal
2018-12-17 13:21                               ` Naga Sureshkumar Relli
2018-12-17 16:41                                 ` Miquel Raynal [this message]
2018-12-18  5:33                                   ` Naga Sureshkumar Relli
2018-12-19 14:26                                     ` Miquel Raynal
2018-12-21  7:36                                       ` Naga Sureshkumar Relli
2019-01-28  6:04                                         ` Naga Sureshkumar Relli
2019-01-28  9:27                                           ` Miquel Raynal
2019-01-28  9:35                                             ` Naga Sureshkumar Relli
2019-06-19  4:44                                             ` Naga Sureshkumar Relli
2019-06-27 16:27                                               ` Miquel Raynal
2019-06-28  4:20                                                 ` Naga Sureshkumar Relli
2018-11-15 16:45   ` Dan Carpenter
2018-11-20 16:24   ` Boris Brezillon
2018-12-04  9:18     ` Naga Sureshkumar Relli

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