From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_2 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 35C36C282DD for ; Thu, 9 Jan 2020 16:51:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0FCDE20721 for ; Thu, 9 Jan 2020 16:51:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731430AbgAIQvN convert rfc822-to-8bit (ORCPT ); Thu, 9 Jan 2020 11:51:13 -0500 Received: from relay10.mail.gandi.net ([217.70.178.230]:54967 "EHLO relay10.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731549AbgAIQvN (ORCPT ); Thu, 9 Jan 2020 11:51:13 -0500 Received: from xps13 (unknown [91.224.148.103]) (Authenticated sender: miquel.raynal@bootlin.com) by relay10.mail.gandi.net (Postfix) with ESMTPSA id D0FFA240004; Thu, 9 Jan 2020 16:51:08 +0000 (UTC) Date: Thu, 9 Jan 2020 17:51:07 +0100 From: Miquel Raynal To: Mason Yang Cc: richard@nod.at, marek.vasut@gmail.com, dwmw2@infradead.org, bbrezillon@kernel.org, computersforpeace@gmail.com, vigneshr@ti.com, robh+dt@kernel.org, mark.rutland@arm.com, devicetree@vger.kernel.org, juliensu@mxic.com.tw, linux-kernel@vger.kernel.org, linux-mtd@lists.infradead.org Subject: Re: [PATCH v4 1/2] mtd: rawnand: Add support for Macronix NAND randomizer Message-ID: <20200109175107.57566c18@xps13> In-Reply-To: <1571902807-10388-2-git-send-email-masonccyang@mxic.com.tw> References: <1571902807-10388-1-git-send-email-masonccyang@mxic.com.tw> <1571902807-10388-2-git-send-email-masonccyang@mxic.com.tw> Organization: Bootlin X-Mailer: Claws Mail 3.17.4 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Hi Mason, Mason Yang wrote on Thu, 24 Oct 2019 15:40:06 +0800: > Macronix NANDs support randomizer operation for user data scrambled, > which can be enabled with a SET_FEATURE. > > User data written to the NAND device without randomizer is still readable > after randomizer function enabled. > The penalty of randomizer are subpage accesses prohibited and more time > period is needed in program operation and entering deep power-down mode. > i.e., tPROG 300us to 340us(randomizer enabled) > > For more high-reliability concern, if subpage write not available with > hardware ECC and then to enable randomizer is recommended by default. > Driver checks byte 167 of Vendor Blocks in ONFI parameter page table > to see if this high-reliability function is supported. By adding a new > specific DT property in children nodes to enable randomizer function. > > Signed-off-by: Mason Yang > --- > drivers/mtd/nand/raw/nand_macronix.c | 69 ++++++++++++++++++++++++++++++++++++ > 1 file changed, 69 insertions(+) > > diff --git a/drivers/mtd/nand/raw/nand_macronix.c b/drivers/mtd/nand/raw/nand_macronix.c > index 58511ae..89101fa 100644 > --- a/drivers/mtd/nand/raw/nand_macronix.c > +++ b/drivers/mtd/nand/raw/nand_macronix.c > @@ -11,6 +11,14 @@ > #define MACRONIX_READ_RETRY_BIT BIT(0) > #define MACRONIX_NUM_READ_RETRY_MODES 6 > > +#define MACRONIX_RANDOMIZER_BIT BIT(1) > +#define ONFI_FEATURE_ADDR_MXIC_RANDOMIZER 0xB0 > +#define ENPGM BIT(0) > +#define RANDEN BIT(1) > +#define RANDOPT BIT(2) I forgot: please be consistent with the naming. Thanks, Miquèl