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arc=none smtp.client-ip=217.70.183.195 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="PnBj5ONm" Received: by mail.gandi.net (Postfix) with ESMTPSA id 5069A1F47D; Mon, 18 Aug 2025 08:47:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1755506877; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=05uZQNCBQ/IPvhbxPL5JdbGCZAnK3adcFj09yVob0Hc=; b=PnBj5ONmj2Yn5z4ff+jP177N7rjlq64b37wwk7rHybTUCHIrFN6AqOup9BGYqFItEAqZl/ /pES8TO8DayqbQUCGnIbFDy24UIqsywmZjqBH4kr3oTnZjFQhQizDtsqAMCA40/2npM075 dbucluRnwlpwFrURVMiOnINoxTQdioxUi4f3DPJsGAaKe3K9EgKlov0wBqFpIpohjYqstm 5vzDwB6fMuM0vbgUNq8a2UClNeBgh8YiNDxP0qwTy805EWBVULCTM+1j4yWT7fCS0GHlGE 192aGCg5AtFEvdBaTVCRupO2r5LN5KMe+5v65ogfo4p07FbRm3HPK9cpwnXS+A== From: Miquel Raynal To: Cheng Ming Lin Cc: vigneshr@ti.com, linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org, richard@nod.at, alvinzhou@mxic.com.tw, leoyu@mxic.com.tw, Cheng Ming Lin Subject: Re: [PATCH 2/2] mtd: spi-nand: macronix: Add randomizer support In-Reply-To: (Cheng Ming Lin's message of "Mon, 11 Aug 2025 11:01:25 +0800") References: <20250808095503.906244-1-linchengming884@gmail.com> <20250808095503.906244-3-linchengming884@gmail.com> <87zfca9kur.fsf@bootlin.com> User-Agent: mu4e 1.12.7; emacs 30.1 Date: Mon, 18 Aug 2025 10:47:53 +0200 Message-ID: <87y0rhyq12.fsf@bootlin.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-GND-State: clean X-GND-Score: -100 X-GND-Cause: gggruggvucftvghtrhhoucdtuddrgeeffedrtdefgdduhedvudejucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuifetpfffkfdpucggtfgfnhhsuhgsshgtrhhisggvnecuuegrihhlohhuthemuceftddunecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpefhvfevufgjfhgffffkgggtgfesthhqredttderjeenucfhrhhomhepofhiqhhuvghlucftrgihnhgrlhcuoehmihhquhgvlhdrrhgrhihnrghlsegsohhothhlihhnrdgtohhmqeenucggtffrrghtthgvrhhnpeeutdeuhfffffdugfehleevvdfffeevvedtgfeuteejieeggeeltdehleetgeegvdenucffohhmrghinhepmhigihgtrdgtohhmrdhtfienucfkphepledtrdekledrudeifedruddvjeenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepihhnvghtpeeltddrkeelrdduieefrdduvdejpdhhvghloheplhhotggrlhhhohhsthdpmhgrihhlfhhrohhmpehmihhquhgvlhdrrhgrhihnrghlsegsohhothhlihhnrdgtohhmpdhnsggprhgtphhtthhopeekpdhrtghpthhtoheplhhinhgthhgvnhhgmhhinhhgkeekgeesghhmrghilhdrtghomhdprhgtphhtthhopehvihhgnhgvshhhrhesthhirdgtohhmpdhrtghpthhtoheplhhinhhugidqmhhtugeslhhishhtshdrihhnfhhrrgguvggrugdrohhrghdprhgtphhtthhopehlihhnuhigqdhkvghrnhgvlhesvhhgvghrrdhkvghrnhgvlhdrohhrghdpr hgtphhtthhopehrihgthhgrrhgusehnohgurdgrthdprhgtphhtthhopegrlhhvihhniihhohhusehmgihitgdrtghomhdrthifpdhrtghpthhtoheplhgvohihuhesmhigihgtrdgtohhmrdhtfidprhgtphhtthhopegthhgvnhhgmhhinhhglhhinhesmhigihgtrdgtohhmrdhtfi X-GND-Sasl: miquel.raynal@bootlin.com Hi Chang Ming, On 11/08/2025 at 11:01:25 +08, Cheng Ming Lin w= rote: > Hi Miquel, > > Miquel Raynal =E6=96=BC 2025=E5=B9=B48=E6=9C= =888=E6=97=A5 =E9=80=B1=E4=BA=94 =E4=B8=8B=E5=8D=886:19=E5=AF=AB=E9=81=93= =EF=BC=9A >> >> On 08/08/2025 at 17:55:03 +08, Cheng Ming Lin wrote: >> >> > From: Cheng Ming Lin >> > >> > Enable randomizer function by specific flowchart to set the default va= lue >> > of RANDEN to 1. >> > >> > Randomizer introduces two new DT properties for child nodes to configu= re >> > the randomizer functionality and coverage options. >> > - mxic,enable-randomizer-otp: Specify whether to activate the randomi= zer >> > feature. >> > - mxic,randopt: Define the randomizer area per page. >> >> Can we create a global NAND DT property for that? Enabling a randomizer >> is quite a generic step. >> >> > The penalty of randomizer are subpage accesses prohibited and more time >> > period is needed in program operation and entering deep power-down mod= e. >> > i.e., tPROG 320us to 360us (randomizer enabled). >> >> Do you want to share what is the added value in terms of lifetime to >> enable the randomizer, given the drawbacks which are significant? > > The randomizer mainly targets extremely unbalanced data patterns, > which might potentially lead to data errors. > > Please refer to the attached document: > https://www.mxic.com.tw/Lists/ApplicationNote/Attachments/2151/AN1051V1-T= he%20Introduction%20of%20Randomizer%20Feature%20on%20MX30xFxG28AD_MX35xFxG2= 4AD.pdf Thanks for the link, it may be pointed with a "Link:" tag in your commit to further justify this addition. However it is sparse on details. I would be interested by more details, such as "how many 0s? how many bitflips? how often/likely?" > Figure 1 shows that continuously programming too > many 0s can result in data errors. Thanks, Miqu=C3=A8l