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[2620:137:e000::1:20]) by mx.google.com with ESMTP id b6-20020a170902d50600b001b82da85c5asi15772592plg.336.2023.07.04.18.15.51; Tue, 04 Jul 2023 18:16:26 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@broadcom.com header.s=google header.b=NvrSbUoo; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=broadcom.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231285AbjGEAuf (ORCPT + 99 others); Tue, 4 Jul 2023 20:50:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39340 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229512AbjGEAud (ORCPT ); Tue, 4 Jul 2023 20:50:33 -0400 Received: from mail-yb1-xb2a.google.com (mail-yb1-xb2a.google.com [IPv6:2607:f8b0:4864:20::b2a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9822910D5 for ; Tue, 4 Jul 2023 17:50:32 -0700 (PDT) Received: by mail-yb1-xb2a.google.com with SMTP id 3f1490d57ef6-c4e4c258ba9so3859620276.1 for ; Tue, 04 Jul 2023 17:50:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; t=1688518232; x=1691110232; h=in-reply-to:mime-version:user-agent:date:message-id:from:references :cc:to:subject:from:to:cc:subject:date:message-id:reply-to; bh=+v9IDPZWjJ4VWAyg2+HlN6MMs3iQJ76LtXDfbdbC71E=; b=NvrSbUooMBSpU0XfJ9pxDJm6K1EBEMCcvAcHN4onIria85k7lwhSmBompycBo4NZ+A hJtf0DQZ2OgyUhSKD3XtYl6f/3PUtcumCkV1Zt4PqlzRtCbKC5zVfkUJjZO6CcrT1usT LTVxkAELqHAWy1jBhvvb52JFpbiW1/48gpDvk= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1688518232; x=1691110232; h=in-reply-to:mime-version:user-agent:date:message-id:from:references :cc:to:subject:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=+v9IDPZWjJ4VWAyg2+HlN6MMs3iQJ76LtXDfbdbC71E=; b=LPInCy0DIDJ+7Hk6Mho7iGyz3/ccTfR1qWLWD45nFImtlGEZc3Q+vk/caxaVlEoi5b jt4Ay1Md9es2d2Jcv0iWG3m0jfGy1fhw7G9s2FiW9NOUEvd3LpfmfnqHKt7uvr6qYJbS 8TFg3Fzs6Uxt9rkuxDUdXWTSkN91uCa0SjhaCYkksVMjmqJJGCpFyAkMDf+N9jDQ1nD7 nroRPkmGwGCT9GvU6sy8rLOjJ7foIOW5PYnJrdXRouL4YkaUHRDALYO0C8hx4U4w3EJG NFDlBe3l8jAXsIx88wlI4cPo/UiMsv18i+DDfxZ8cvQeFPZTf/ax71esV+bIZ+FzKv1u YsSw== X-Gm-Message-State: ABy/qLYWoDmFu91jIglHFRn3nayAtQNUs7sLJ7/3NBe3e31ba3gNHcNn RRnav55yHs2qy1es5X6IINRr4w== X-Received: by 2002:a05:6902:28c:b0:c37:f855:cff4 with SMTP id v12-20020a056902028c00b00c37f855cff4mr12465761ybh.63.1688518231690; Tue, 04 Jul 2023 17:50:31 -0700 (PDT) Received: from bcacpedev-irv-3.lvn.broadcom.net ([192.19.161.250]) by smtp.gmail.com with ESMTPSA id et11-20020a056214176b00b0063596878aaasm12235385qvb.18.2023.07.04.17.50.28 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 04 Jul 2023 17:50:30 -0700 (PDT) Subject: Re: [PATCH v3 5/5] mtd: rawnand: brcmnand: Fix mtd oobsize To: Miquel Raynal Cc: Broadcom Kernel List , Linux MTD List , f.fainelli@gmail.com, rafal@milecki.pl, kursad.oney@broadcom.com, joel.peshkin@broadcom.com, computersforpeace@gmail.com, anand.gore@broadcom.com, dregan@mail.com, kamal.dasu@broadcom.com, tomer.yacoby@broadcom.com, dan.beygelman@broadcom.com, Frieder Schrempf , linux-kernel@vger.kernel.org, Vignesh Raghavendra , Richard Weinberger , Boris Brezillon , Kamal Dasu References: <20230627193738.19596-1-william.zhang@broadcom.com> <20230627193738.19596-6-william.zhang@broadcom.com> <20230704173047.395e445e@xps-13> From: William Zhang Message-ID: Date: Tue, 4 Jul 2023 17:50:28 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0 MIME-Version: 1.0 In-Reply-To: <20230704173047.395e445e@xps-13> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="0000000000006b22c905ffb2c913" X-Spam-Status: No, score=-2.2 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,NICE_REPLY_A, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE, URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --0000000000006b22c905ffb2c913 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Hi Miquel, On 07/04/2023 08:30 AM, Miquel Raynal wrote: > Hi William, > > william.zhang@broadcom.com wrote on Tue, 27 Jun 2023 12:37:38 -0700: > >> brcmnand controller can only access the flash spare area up to certain >> bytes based on the ECC level. It can be less than the actual flash spare >> area size. For example, for many NAND chip supporting ECC BCH-8, it has >> 226 bytes spare area. But controller can only uses 218 bytes. So brcmand >> driver overrides the mtd oobsize with the controller's accessible spare >> area size. When the nand base driver utilizes the nand_device object, it >> resets the oobsize back to the actual flash spare aprea size from >> nand_memory_organization structure and controller may not able to access >> all the oob area as mtd advises. >> >> This change fixes the issue by overriding the oobsize in the >> nand_memory_organization structure to the controller's accessible spare >> area size. > > I am clearly not a big fan of this solution. memorg should be and > remain a read only object. Can you please find another solution? > I was debating on this too but I don't see option because there is no other hooks after nanddev_init to set the mtd->oobsize as far as I can see and I see there were similar fixes for other controller drivers after the nand device object init was committed, for example: Fixes: 629a442cad5f ("mtd: rawnand: Fill memorg during detection") I will think through this again but I am open to any suggestion. >> >> Fixes: a7ab085d7c16 ("mtd: rawnand: Initialize the nand_device object") >> Signed-off-by: William Zhang >> >> --- >> >> Changes in v3: None >> Changes in v2: None >> >> drivers/mtd/nand/raw/brcmnand/brcmnand.c | 7 +++++-- >> 1 file changed, 5 insertions(+), 2 deletions(-) >> >> diff --git a/drivers/mtd/nand/raw/brcmnand/brcmnand.c b/drivers/mtd/nand/raw/brcmnand/brcmnand.c >> index 407bf79cbaf4..39c7f547db1f 100644 >> --- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c >> +++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c >> @@ -2647,6 +2647,8 @@ static int brcmnand_setup_dev(struct brcmnand_host *host) >> struct nand_chip *chip = &host->chip; >> const struct nand_ecc_props *requirements = >> nanddev_get_ecc_requirements(&chip->base); >> + struct nand_memory_organization *memorg = >> + nanddev_get_memorg(&chip->base); >> struct brcmnand_controller *ctrl = host->ctrl; >> struct brcmnand_cfg *cfg = &host->hwcfg; >> char msg[128]; >> @@ -2668,10 +2670,11 @@ static int brcmnand_setup_dev(struct brcmnand_host *host) >> if (cfg->spare_area_size > ctrl->max_oob) >> cfg->spare_area_size = ctrl->max_oob; >> /* >> - * Set oobsize to be consistent with controller's spare_area_size, as >> - * the rest is inaccessible. >> + * Set mtd and memorg oobsize to be consistent with controller's >> + * spare_area_size, as the rest is inaccessible. >> */ >> mtd->oobsize = cfg->spare_area_size * (mtd->writesize >> FC_SHIFT); >> + memorg->oobsize = mtd->oobsize; >> >> cfg->device_size = mtd->size; >> cfg->block_size = mtd->erasesize; > > > Thanks, > Miquèl > 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