From patchwork Mon May 31 18:17:51 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pratyush Yadav X-Patchwork-Id: 12289835 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=-14.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 1E2E8C47080 for ; Mon, 31 May 2021 18:18:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DB802600EF for ; Mon, 31 May 2021 18:18:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231673AbhEaSUF (ORCPT ); Mon, 31 May 2021 14:20:05 -0400 Received: from fllv0015.ext.ti.com ([198.47.19.141]:59202 "EHLO fllv0015.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231409AbhEaSUE (ORCPT ); Mon, 31 May 2021 14:20:04 -0400 Received: from lelv0266.itg.ti.com ([10.180.67.225]) by fllv0015.ext.ti.com (8.15.2/8.15.2) with ESMTP id 14VII2qb078793; Mon, 31 May 2021 13:18:02 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1622485082; bh=HsbRxHmzurwf7J0PNrAE7LrJRA57/L7yoP2/CM+aImU=; h=From:To:Subject:Date; b=dzscoPH5ucskoi9X8RByttDJfSEw27wj15tKxGlVyBv2jaJnBAPs+647MwhDj0fln bNh03cQ2X3ZTq3qxcdgE3/d0rmCLWcqz3kf0CuVESravHFlsDads3JmVKrwQuOUAOv nFRTvcMbBuaa/8AX2zj1SVOuIA5IgdkDbC0nQRoo= Received: from DLEE100.ent.ti.com (dlee100.ent.ti.com [157.170.170.30]) by lelv0266.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 14VII2qG026763 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Mon, 31 May 2021 13:18:02 -0500 Received: from DLEE101.ent.ti.com (157.170.170.31) by DLEE100.ent.ti.com (157.170.170.30) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.2; Mon, 31 May 2021 13:18:02 -0500 Received: from fllv0039.itg.ti.com (10.64.41.19) by DLEE101.ent.ti.com (157.170.170.31) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.2 via Frontend Transport; Mon, 31 May 2021 13:18:02 -0500 Received: from pratyush-OptiPlex-790.dhcp.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by fllv0039.itg.ti.com (8.15.2/8.15.2) with ESMTP id 14VIHwdF118543; Mon, 31 May 2021 13:17:59 -0500 From: Pratyush Yadav To: Tudor Ambarus , Michael Walle , Pratyush Yadav , Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Mark Brown , , , Subject: [PATCH v2 0/6] Avoid odd length/address read/writes in 8D-8D-8D mode. Date: Mon, 31 May 2021 23:47:51 +0530 Message-ID: <20210531181757.19458-1-p.yadav@ti.com> X-Mailer: git-send-email 2.30.0 MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org Hi, On Octal DTR flashes like Micron Xcella or Cypress S28 family, reads or writes cannot start at an odd address in 8D-8D-8D mode. Neither can they be odd bytes long. Upper layers like filesystems don't know what mode the flash is in, and hence don't know the read/write address or length limitations. They might issue reads or writes that leave the flash in an error state. In fact, using UBIFS on top of the flash was how I first noticed this problem. This series fixes that problem by padding the read/write with extra bytes to make sure the final operation has an even address and length. More info in patches 5 and 6. Patches 1-3 fix some existing odd-byte long reads. Patch 4 adds checks to disallow odd length command/address/dummy/data phases in 8D-8D-8D mode. Note that this does not restrict the _value_ of the address from being odd since this is a restriction on the flash, not the protocol itself. Patch 4 should go through the SPI tree but I have included it in this series because if it goes in before patches 1-3, Micron MT35XU and Cypress S28HS flashes will stop working correctly. Tested on TI J721E for Micron MT35 and on TI J7200 for Cypress S28. Changes in v2: Collect R-bys and cosmetic fixes. No functional changes. See the patches for detailed changelog. Pratyush Yadav (6): mtd: spi-nor: core: use 2 data bytes for template ops mtd: spi-nor: spansion: write 2 bytes when disabling Octal DTR mode mtd: spi-nor: micron-st: write 2 bytes when disabling Octal DTR mode spi: spi-mem: reject partial cycle transfers in 8D-8D-8D mode mtd: spi-nor: core: avoid odd length/address reads on 8D-8D-8D mode mtd: spi-nor: core: avoid odd length/address writes in 8D-8D-8D mode drivers/mtd/spi-nor/core.c | 159 +++++++++++++++++++++++++++++++- drivers/mtd/spi-nor/micron-st.c | 22 ++++- drivers/mtd/spi-nor/spansion.c | 18 +++- drivers/spi/spi-mem.c | 12 ++- 4 files changed, 196 insertions(+), 15 deletions(-)