From patchwork Tue Aug 29 10:17:12 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Lothar_Wa=C3=9Fmann?= X-Patchwork-Id: 807026 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=lists.infradead.org (client-ip=65.50.211.133; helo=bombadil.infradead.org; envelope-from=linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org; receiver=) Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="GKE5r1nu"; dkim-atps=neutral Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3xhPlc5Wmcz9sNc for ; Tue, 29 Aug 2017 20:20:12 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=LxtvYLumLM0vtF8gVeluAV4JvCsPcWM/N5Vvsv5GQ2w=; b=GKE5r1nuqCuTac M9pcGUCK9ZnUWNC53ODHjGUgu2MrK8M/6ddwouINpt2bOtP+g3oQszOGyBsi6/37ywRE34iyVvbuX ewSBD5EpeKib2UZyNcReDnGl7v0Jc42gD2V4bfkknd5u9gXPGz1IrMxwa5aFpqPCgAErQSDr6MVHo RVCpv2N+dVXi+396esOybd42HEeJQPw9hj9YtchXx7mvPj0UQosF8T07DWzl5c6GPN89YEpyfMRwG /FkpzA/qxBpH5MrSvaeNU9hkqqYAGjCRmJanYQwEatgEyOjQXIur+XSa5J44LvEBrL/H9PP+o7Bbm 2bCsy+TMmEyzA0QJfkhw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1dmdca-0003Ty-5V; Tue, 29 Aug 2017 10:19:48 +0000 Received: from smtprelay06.ispgateway.de ([80.67.18.29]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1dmday-00027R-2n for linux-mtd@lists.infradead.org; Tue, 29 Aug 2017 10:18:11 +0000 Received: from [89.1.81.74] (helo=ipc1.ka-ro) by smtprelay06.ispgateway.de with esmtpsa (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.89) (envelope-from ) id 1dmdaU-0008HL-LV; Tue, 29 Aug 2017 12:17:38 +0200 Received: from lothar by ipc1.ka-ro with local (Exim 4.84_2 #2 (Debian)) id 1dmdaU-0004ii-97; Tue, 29 Aug 2017 12:17:38 +0200 From: =?utf-8?q?Lothar_Wa=C3=9Fmann?= To: Boris Brezillon , Brian Norris , Cyrille Pitchen , David Woodhouse , Marek Vasut , Richard Weinberger , linux-kernel@vger.kernel.org, linux-mtd@lists.infradead.org Subject: [PATCH 1/2] mtd: nand: make Samsung SLC NAND usable again Date: Tue, 29 Aug 2017 12:17:12 +0200 Message-Id: <1504001833-18097-2-git-send-email-LW@KARO-electronics.de> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1504001833-18097-1-git-send-email-LW@KARO-electronics.de> References: <1504001833-18097-1-git-send-email-LW@KARO-electronics.de> MIME-Version: 1.0 X-Df-Sender: bHdAa2Fyby1lbGVjdHJvbmljcy5kZQ== X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170829_031809_205174_00C541DD X-CRM114-Status: GOOD ( 11.84 ) X-Spam-Score: -2.6 (--) X-Spam-Report: SpamAssassin version 3.4.1 on bombadil.infradead.org summary: Content analysis details: (-2.6 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [80.67.18.29 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record -0.0 SPF_HELO_PASS SPF: HELO matches SPF record -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: =?utf-8?q?Lothar_Wa=C3=9Fmann?= Sender: "linux-mtd" Errors-To: linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org commit c51d0ac59f24 ("mtd: nand: Move Samsung specific init/detection logic in nand_samsung.c") introduced a regression for Samsung SLC NAND chips. Prior to this commit chip->bits_per_cell was initialized by calling nand_get_bits_per_cell() before using nand_is_slc(). With the offending commit this call is skipped, leaving chip->bits_per_cell cleared to zero when the manufacturer specific '.detect' function calls nand_is_slc() which in turn interprets bits_per_cell != 1 as indication for an MLC chip. The effect is that e.g. a K9F1G08U0F NAND chip is falsely detected as MLC NAND with 4KiB page size rather than SLC with 2KiB page size. Add a call to nand_get_bits_per_cell() before calling the .detect hook function in nand_manufacturer_detect(), so that the nand_is_slc() calls in the manufacturer specific code will return correct results. Signed-off-by: Lothar Waßmann --- drivers/mtd/nand/nand_base.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index 9900476..bcc8cef1 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -3820,10 +3820,13 @@ static void nand_manufacturer_detect(struct nand_chip *chip) * nand_decode_ext_id() otherwise. */ if (chip->manufacturer.desc && chip->manufacturer.desc->ops && - chip->manufacturer.desc->ops->detect) + chip->manufacturer.desc->ops->detect) { + /* The 3rd id byte holds MLC / multichip data */ + chip->bits_per_cell = nand_get_bits_per_cell(chip->id.data[2]); chip->manufacturer.desc->ops->detect(chip); - else + } else { nand_decode_ext_id(chip); + } } /*