From patchwork Thu Aug 20 09:19:29 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 265289 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=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT 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 904EEC433E5 for ; Thu, 20 Aug 2020 13:39:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6A28E22B3F for ; Thu, 20 Aug 2020 13:39:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597930760; bh=io+BRFKGROeR38sVt8rmEmwA9RE4GWl4AZRy24OAa9A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=KCgOHkgaG1DSnK8b2DRwbYogXmJ66GBUsNOGzbjRClbcUXV/LAZnNU+vDBrDjyAgN kJEdPizBTjAPdDYHgGN9KS3gNwZCg68RyIrVlTpMlUVMZayZven5h0zFXgAYJrFu9u 9gpoUDt4bqKhepHshCpp8/FHXm5bMTtKn7z/FL2c= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729655AbgHTNjT (ORCPT ); Thu, 20 Aug 2020 09:39:19 -0400 Received: from mail.kernel.org ([198.145.29.99]:33352 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728013AbgHTJ3C (ORCPT ); Thu, 20 Aug 2020 05:29:02 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 54AC422D06; Thu, 20 Aug 2020 09:29:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597915741; bh=io+BRFKGROeR38sVt8rmEmwA9RE4GWl4AZRy24OAa9A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VVF8HTJvWZDWyIrb6kwY2XW9wzsj9HC/vPy7L/Fdhmg9/SFTsBEn0xRkwaqcpsAAz ifYS3zh/36/7FJpPSeo7B56uy0R5yaSwrkTdITdVdSKWNB8vbE3SJCe337+C+HEuu0 Ts7TPYAnx9hyzzz75aOIhAS2FO9hyylqaLuHQF98= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Kamal Dasu , Miquel Raynal , Sasha Levin Subject: [PATCH 5.8 118/232] mtd: rawnand: brcmnand: ECC error handling on EDU transfers Date: Thu, 20 Aug 2020 11:19:29 +0200 Message-Id: <20200820091618.529746352@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200820091612.692383444@linuxfoundation.org> References: <20200820091612.692383444@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Kamal Dasu [ Upstream commit 4551e78ad98add1f16b70cf286d5aad3ce7bcd4c ] Implement ECC correctable and uncorrectable error handling for EDU reads. If ECC correctable bitflips are encountered on EDU transfer, read page again using PIO. This is needed due to a NAND controller limitation where corrected data is not transferred to the DMA buffer on ECC error. This applies to ECC correctable errors that are reported by the controller hardware based on set number of bitflips threshold in the controller threshold register, bitflips below the threshold are corrected silently and are not reported by the controller hardware. Fixes: a5d53ad26a8b ("mtd: rawnand: brcmnand: Add support for flash-edu for dma transfers") Signed-off-by: Kamal Dasu Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20200612212902.21347-3-kdasu.kdev@gmail.com Signed-off-by: Sasha Levin --- drivers/mtd/nand/raw/brcmnand/brcmnand.c | 26 ++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/drivers/mtd/nand/raw/brcmnand/brcmnand.c b/drivers/mtd/nand/raw/brcmnand/brcmnand.c index ac934a715a194..a4033d32a7103 100644 --- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c +++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c @@ -1918,6 +1918,22 @@ static int brcmnand_edu_trans(struct brcmnand_host *host, u64 addr, u32 *buf, edu_writel(ctrl, EDU_STOP, 0); /* force stop */ edu_readl(ctrl, EDU_STOP); + if (!ret && edu_cmd == EDU_CMD_READ) { + u64 err_addr = 0; + + /* + * check for ECC errors here, subpage ECC errors are + * retained in ECC error address register + */ + err_addr = brcmnand_get_uncorrecc_addr(ctrl); + if (!err_addr) { + err_addr = brcmnand_get_correcc_addr(ctrl); + if (err_addr) + ret = -EUCLEAN; + } else + ret = -EBADMSG; + } + return ret; } @@ -2124,6 +2140,7 @@ static int brcmnand_read(struct mtd_info *mtd, struct nand_chip *chip, u64 err_addr = 0; int err; bool retry = true; + bool edu_err = false; dev_dbg(ctrl->dev, "read %llx -> %p\n", (unsigned long long)addr, buf); @@ -2141,6 +2158,10 @@ static int brcmnand_read(struct mtd_info *mtd, struct nand_chip *chip, else return -EIO; } + + if (has_edu(ctrl) && err_addr) + edu_err = true; + } else { if (oob) memset(oob, 0x99, mtd->oobsize); @@ -2188,6 +2209,11 @@ static int brcmnand_read(struct mtd_info *mtd, struct nand_chip *chip, if (mtd_is_bitflip(err)) { unsigned int corrected = brcmnand_count_corrected(ctrl); + /* in case of EDU correctable error we read again using PIO */ + if (edu_err) + err = brcmnand_read_by_pio(mtd, chip, addr, trans, buf, + oob, &err_addr); + dev_dbg(ctrl->dev, "corrected error at 0x%llx\n", (unsigned long long)err_addr); mtd->ecc_stats.corrected += corrected;