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=-2.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_2 autolearn=no 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 32DEFC83000 for ; Tue, 28 Apr 2020 06:26:51 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 01743206B8 for ; Tue, 28 Apr 2020 06:26:50 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="oj//Ybze" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 01743206B8 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=collabora.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org 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:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=hHsZYYNMdqgJhtj2vm7q2hKMG5GTEGLb9ZLf1j7IiXk=; b=oj//YbzenPCJzo OxaA96Y19Ek4DSBnMUDclPKmaZHaARzLa+h4ZtwQt1s2Xn7ECJmpcCG4CpUeMLbVw0YeSnq9CBTR5 UXfzw2kYytb3WZODMntZA9fopbEisqzAJwvVaFfqf4XmWXY0N/waIhFO8oiOhvKdkZpoTgjyhS7rN OH406cyV1GGFqk0kqoQq8In3qTmfw1HKg15PuGY+C7Zg3631kBfp1UUmgRgQ2Xv3ZLy/edYxGKccP /9TQBl+R5t4sEU34UjyOZM1Z3fwvIzzlVxUZVN4cM3Q4arpPwQwhq6EMSxln9KMGJOjEFWgxedNiX kH4DEIpqkCEdHJy8Kzsg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jTJhZ-000147-6p; Tue, 28 Apr 2020 06:26:41 +0000 Received: from bhuna.collabora.co.uk ([46.235.227.227]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jTJhW-000132-8V for linux-mtd@lists.infradead.org; Tue, 28 Apr 2020 06:26:39 +0000 Received: from localhost (unknown [IPv6:2a01:e0a:2c:6930:b93f:9fae:b276:a89a]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: bbrezillon) by bhuna.collabora.co.uk (Postfix) with ESMTPSA id 578882A0BA2; Tue, 28 Apr 2020 07:26:35 +0100 (BST) Date: Tue, 28 Apr 2020 08:26:32 +0200 From: Boris Brezillon To: Miquel Raynal Subject: Re: [PATCH 16/17] mtd: rawnand: cafe: Handle non-32bit aligned reads/writes Message-ID: <20200428082632.2fc9d06f@collabora.com> In-Reply-To: <20200427220459.32a26073@xps13> References: <20200427082028.394719-1-boris.brezillon@collabora.com> <20200427082028.394719-17-boris.brezillon@collabora.com> <20200427220459.32a26073@xps13> Organization: Collabora X-Mailer: Claws Mail 3.17.5 (GTK+ 2.24.32; x86_64-redhat-linux-gnu) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200427_232638_430567_6B812D4A X-CRM114-Status: GOOD ( 14.06 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-mtd@lists.infradead.org, Tudor Ambarus , David Woodhouse , Vignesh Raghavendra , Richard Weinberger Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org On Mon, 27 Apr 2020 22:04:59 +0200 Miquel Raynal wrote: > Hi Boris, > > Boris Brezillon wrote on Mon, 27 Apr > 2020 10:20:26 +0200: > > > The spec says the write/read buffers should be filled/read 32bits at a > > time. While most of the time the reads/writes are aligned on 4 bytes, > > we should make the implementation more robust to non-usual NAND > > operations. > > Well, if I didn't get confused by the previous changes, I think these > are used by ->exec_op() and at boot time there are 2B (ID), 3B (I > don't remember) and 5B (full ID) accesses that are performed. These are > not 32-bit aligned. Oh, you're right. Looks like read_byte() does single byte accesses already, meaning that readb is allowed on the MMIO region. I'll just drop this patch then. ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/