Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 99861C433EF for ; Tue, 16 Nov 2021 01:52:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8311861AA7 for ; Tue, 16 Nov 2021 01:52:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1353729AbhKPBzW (ORCPT ); Mon, 15 Nov 2021 20:55:22 -0500 Received: from mail.kernel.org ([198.145.29.99]:55786 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240710AbhKOSQ3 (ORCPT ); Mon, 15 Nov 2021 13:16:29 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 4014E61BFE; Mon, 15 Nov 2021 17:50:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1636998603; bh=XLKvNwIltg/eHupHe5wWDz9tnnRepo+d+LVHb8CH5c0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VTVbRXIL/AOSz0VnS77D3C9fv80RW1ljEFWEmYGVNuh9FVh3gfTKit8WyPKUMIWQV wPlJ+pIKhrcdtQvH6HaL9EH9QO1H1FezG4iAxD8VCuSlE33MK7uls3rQdSdkI4QgEK OCH78Zf42x6AWCQTFO3BeM7qWqyuKQ2eo7SlVKgU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Miquel Raynal Subject: [PATCH 5.10 568/575] mtd: rawnand: plat_nand: Keep the driver compatible with on-die ECC engines Date: Mon, 15 Nov 2021 18:04:53 +0100 Message-Id: <20211115165403.340521694@linuxfoundation.org> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211115165343.579890274@linuxfoundation.org> References: <20211115165343.579890274@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Miquel Raynal commit 325fd539fc84f0aaa0ceb9d7d3b8718582473dc5 upstream. Following the introduction of the generic ECC engine infrastructure, it was necessary to reorganize the code and move the ECC configuration in the ->attach_chip() hook. Failing to do that properly lead to a first series of fixes supposed to stabilize the situation. Unfortunately, this only fixed the use of software ECC engines, preventing any other kind of engine to be used, including on-die ones. It is now time to (finally) fix the situation by ensuring that we still provide a default (eg. software ECC) but will still support different ECC engines such as on-die ECC engines if properly described in the device tree. There are no changes needed on the core side in order to do this, but we just need to leverage the logic there which allows: 1- a subsystem default (set to Host engines in the raw NAND world) 2- a driver specific default (here set to software ECC engines) 3- any type of engine requested by the user (ie. described in the DT) As the raw NAND subsystem has not yet been fully converted to the ECC engine infrastructure, in order to provide a default ECC engine for this driver we need to set chip->ecc.engine_type *before* calling nand_scan(). During the initialization step, the core will consider this entry as the default engine for this driver. This value may of course be overloaded by the user if the usual DT properties are provided. Fixes: 612e048e6aab ("mtd: rawnand: plat_nand: Move the ECC initialization to ->attach_chip()") Cc: stable@vger.kernel.org Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20210928222258.199726-8-miquel.raynal@bootlin.com Signed-off-by: Greg Kroah-Hartman --- drivers/mtd/nand/raw/plat_nand.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) --- a/drivers/mtd/nand/raw/plat_nand.c +++ b/drivers/mtd/nand/raw/plat_nand.c @@ -21,9 +21,8 @@ struct plat_nand_data { static int plat_nand_attach_chip(struct nand_chip *chip) { - chip->ecc.engine_type = NAND_ECC_ENGINE_TYPE_SOFT; - - if (chip->ecc.algo == NAND_ECC_ALGO_UNKNOWN) + if (chip->ecc.engine_type == NAND_ECC_ENGINE_TYPE_SOFT && + chip->ecc.algo == NAND_ECC_ALGO_UNKNOWN) chip->ecc.algo = NAND_ECC_ALGO_HAMMING; return 0; @@ -94,6 +93,13 @@ static int plat_nand_probe(struct platfo goto out; } + /* + * This driver assumes that the default ECC engine should be TYPE_SOFT. + * Set ->engine_type before registering the NAND devices in order to + * provide a driver specific default value. + */ + data->chip.ecc.engine_type = NAND_ECC_ENGINE_TYPE_SOFT; + /* Scan to find existence of the device */ err = nand_scan(&data->chip, pdata->chip.nr_chips); if (err)