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=-0.9 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED 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 1FDBAC04EB8 for ; Wed, 12 Dec 2018 08:11:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E51042084E for ; Wed, 12 Dec 2018 08:11:50 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E51042084E Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=bootlin.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726750AbeLLILt convert rfc822-to-8bit (ORCPT ); Wed, 12 Dec 2018 03:11:49 -0500 Received: from mail.bootlin.com ([62.4.15.54]:52828 "EHLO mail.bootlin.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726437AbeLLILt (ORCPT ); Wed, 12 Dec 2018 03:11:49 -0500 Received: by mail.bootlin.com (Postfix, from userid 110) id D215B20CEB; Wed, 12 Dec 2018 09:11:46 +0100 (CET) Received: from xps13 (aaubervilliers-681-1-89-7.w90-88.abo.wanadoo.fr [90.88.30.7]) by mail.bootlin.com (Postfix) with ESMTPSA id 7A8882073D; Wed, 12 Dec 2018 09:11:36 +0100 (CET) Date: Wed, 12 Dec 2018 09:11:35 +0100 From: Miquel Raynal To: Naga Sureshkumar Relli Cc: Boris Brezillon , "robh@kernel.org" , "richard@nod.at" , "linux-kernel@vger.kernel.org" , "marek.vasut@gmail.com" , "linux-mtd@lists.infradead.org" , "nagasuresh12@gmail.com" , Michal Simek , "computersforpeace@gmail.com" , "dwmw2@infradead.org" Subject: Re: [LINUX PATCH v12 3/3] mtd: rawnand: arasan: Add support for Arasan NAND Flash Controller Message-ID: <20181212091135.1d0cc9a6@xps13> In-Reply-To: References: <1541739641-17789-1-git-send-email-naga.sureshkumar.relli@xilinx.com> <1541739641-17789-4-git-send-email-naga.sureshkumar.relli@xilinx.com> <20181118204324.373ca9cc@bbrezillon> <20181119090246.49060019@bbrezillon> <20181120120244.7d2442b5@bbrezillon> <20181120133624.3fa4742d@xps13> Organization: Bootlin X-Mailer: Claws Mail 3.17.1 (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: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Naga, Naga Sureshkumar Relli wrote on Wed, 12 Dec 2018 05:27:03 +0000: > Hi Boris & Miquel, > > An update to my comments on thread https://lkml.org/lkml/2018/11/15/656. > In this I said, will take a default error count value as 16 and during page read, will check the error count > Register value with this and if it is equal to or greater than the default count(16) then I am checking for > Erased pages. > But bit[7:0] in ECC_Error_Count_Register(0x38) will update for each error occurred. > Link: https://www.xilinx.com/html_docs/registers/ug1087/ug1087-zynq-ultrascale-registers.html and > check for NAND module, ECC_Error_Count_Register. > > I mean previously I dependent on Total error count value (bit[16:8]), but we can simply check for bit[7:0] > To see the error occurred or not. > I tried with this approach and I don't see any issues with that. > I ran ubifs with this and I am able to see the bit[7:0] count is updated for erased page read and then will > Use nand_chech_erased_ecc_chunk() to see the bitflips. > > If it is ok, I will update the driver and will send new patch, but do you have any other comments on v12? Is 'nandbiterrs -i' running correctly now? Thanks, Miquèl