From patchwork Tue Jun 23 18:30:26 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pratyush Yadav X-Patchwork-Id: 1315455 X-Patchwork-Delegate: tudor.ambarus@gmail.com Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=lists.infradead.org (client-ip=2001:8b0:10b:1231::1; helo=merlin.infradead.org; envelope-from=linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=quarantine dis=none) header.from=ti.com Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=merlin.20170209 header.b=rjJXIL3r; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=ti.com header.i=@ti.com header.a=rsa-sha256 header.s=ti-com-17Q1 header.b=nKA+TYK4; dkim-atps=neutral Received: from merlin.infradead.org (merlin.infradead.org [IPv6:2001:8b0:10b:1231::1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 49rxYG34MCz9sQx for ; Wed, 24 Jun 2020 05:44:02 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.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=yAppk7LmUx4TsFTqLkT6rmlVRO+MPI6An/B87Kjn+pE=; b=rjJXIL3rwaI4Lg/RG1z4Y1jwC EPa17b0ioOeo+mFkYUp11J9jqJmRXS5kizqYpnwCDeQkieYXuuvZZy0eBKUpAitMqabhyKET9c1l0 4dmsvnHaemAv7AM5Gxdno9ecpKjXK+a4yDJfKA7kq/4f7InrbBr4v6G9l9DS2UeKuIo04fzT2MtC4 uldH3NOQq2N8JZ59wrMl8u3qEBimr/OTScl8AzaDe4DQDZVwPR7ItHXgjvNOaP1VdjyPVAiP2H6gi Fj+J5XeuScqva/9MCFfDYG66QfAtVyfrCKlTspo7bj3vgkD2970ajH3D1JM1GrrTV1cz/qrlu8D5A CZmQmdBpQ==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jnnoq-000649-Na; Tue, 23 Jun 2020 18:38:52 +0000 Received: from fllv0015.ext.ti.com ([198.47.19.141]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jnni0-0001M8-0d; Tue, 23 Jun 2020 18:31:49 +0000 Received: from lelv0265.itg.ti.com ([10.180.67.224]) by fllv0015.ext.ti.com (8.15.2/8.15.2) with ESMTP id 05NIVgfs015503; Tue, 23 Jun 2020 13:31:42 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1592937102; bh=+9NIrA4n9jHaA7m5shuw6eaiav9h5E9T8IhlYODPiN0=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=nKA+TYK41YcspvuVCTDFc02e+otO+XksqUfFCrEafnMU2k7RsWO6KcRsoGYOY2jOd YdzT2fZxverlHzWgJuvugXdNO/GHgcP/pWkMAFnYknI25VkKPq8e5pzhKs+SN1EgYE 75SkYACyU2timMHAcKWyVUfh7+JgLDC3Pq8ZmL48= Received: from DFLE115.ent.ti.com (dfle115.ent.ti.com [10.64.6.36]) by lelv0265.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 05NIVgkL050364 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Tue, 23 Jun 2020 13:31:42 -0500 Received: from DFLE101.ent.ti.com (10.64.6.22) by DFLE115.ent.ti.com (10.64.6.36) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1979.3; Tue, 23 Jun 2020 13:31:42 -0500 Received: from fllv0039.itg.ti.com (10.64.41.19) by DFLE101.ent.ti.com (10.64.6.22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1979.3 via Frontend Transport; Tue, 23 Jun 2020 13:31:42 -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 05NIUVJR000942; Tue, 23 Jun 2020 13:31:37 -0500 From: Pratyush Yadav To: Tudor Ambarus , Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Mark Brown , Nicolas Ferre , Alexandre Belloni , Ludovic Desroches , Matthias Brugger , Michal Simek , , , , , Subject: [PATCH v10 13/17] mtd: spi-nor: core: perform a Soft Reset on shutdown Date: Wed, 24 Jun 2020 00:00:26 +0530 Message-ID: <20200623183030.26591-14-p.yadav@ti.com> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200623183030.26591-1-p.yadav@ti.com> References: <20200623183030.26591-1-p.yadav@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 X-Spam-Note: CRM114 invocation failed X-Spam-Score: -2.5 (--) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-2.5 points) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at https://www.dnswl.org/, medium trust [198.47.19.141 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.0 DKIMWL_WL_HIGH DKIMwl.org - Whitelisted High sender 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: Boris Brezillon , Sekhar Nori , Pratyush Yadav Sender: "linux-mtd" Errors-To: linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org Perform a Soft Reset on shutdown on flashes that support it so that the flash can be reset to its initial state and any configurations made by spi-nor (given that they're only done in volatile registers) will be reset. This will hand back the flash in pristine state for any further operations on it. Signed-off-by: Pratyush Yadav --- drivers/mtd/spi-nor/core.c | 42 +++++++++++++++++++++++++++++++++++++ include/linux/mtd/spi-nor.h | 2 ++ 2 files changed, 44 insertions(+) diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c index 4a1f6b343534..27ad9bab06dc 100644 --- a/drivers/mtd/spi-nor/core.c +++ b/drivers/mtd/spi-nor/core.c @@ -40,6 +40,9 @@ #define SPI_NOR_MAX_ADDR_WIDTH 4 +#define SPI_NOR_SRST_SLEEP_MIN 200 +#define SPI_NOR_SRST_SLEEP_MAX 400 + /** * spi_nor_get_cmd_ext() - Get the command opcode extension based on the * extension type. @@ -3201,6 +3204,41 @@ static int spi_nor_init(struct spi_nor *nor) return 0; } +static void spi_nor_soft_reset(struct spi_nor *nor) +{ + struct spi_mem_op op; + int ret; + + op = (struct spi_mem_op)SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_SRSTEN, 8), + SPI_MEM_OP_NO_DUMMY, + SPI_MEM_OP_NO_ADDR, + SPI_MEM_OP_NO_DATA); + spi_nor_spimem_setup_op(nor, &op, SNOR_PROTO_8_8_8_DTR); + ret = spi_mem_exec_op(nor->spimem, &op); + if (ret) { + dev_warn(nor->dev, "Software reset failed: %d\n", ret); + return; + } + + op = (struct spi_mem_op)SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_SRST, 8), + SPI_MEM_OP_NO_DUMMY, + SPI_MEM_OP_NO_ADDR, + SPI_MEM_OP_NO_DATA); + spi_nor_spimem_setup_op(nor, &op, SNOR_PROTO_8_8_8_DTR); + ret = spi_mem_exec_op(nor->spimem, &op); + if (ret) { + dev_warn(nor->dev, "Software reset failed: %d\n", ret); + return; + } + + /* + * Software Reset is not instant, and the delay varies from flash to + * flash. Looking at a few flashes, most range somewhere below 100 + * microseconds. So, sleep for a range of 200-400 us. + */ + usleep_range(SPI_NOR_SRST_SLEEP_MIN, SPI_NOR_SRST_SLEEP_MAX); +} + /* mtd resume handler */ static void spi_nor_resume(struct mtd_info *mtd) { @@ -3220,6 +3258,10 @@ void spi_nor_restore(struct spi_nor *nor) if (nor->addr_width == 4 && !(nor->flags & SNOR_F_4B_OPCODES) && nor->flags & SNOR_F_BROKEN_RESET) nor->params->set_4byte_addr_mode(nor, false); + + if (nor->info->flags & SPI_NOR_OCTAL_DTR_READ && + nor->flags & SNOR_F_SOFT_RESET) + spi_nor_soft_reset(nor); } EXPORT_SYMBOL_GPL(spi_nor_restore); diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h index cd549042c53d..299685d15dc2 100644 --- a/include/linux/mtd/spi-nor.h +++ b/include/linux/mtd/spi-nor.h @@ -51,6 +51,8 @@ #define SPINOR_OP_CLFSR 0x50 /* Clear flag status register */ #define SPINOR_OP_RDEAR 0xc8 /* Read Extended Address Register */ #define SPINOR_OP_WREAR 0xc5 /* Write Extended Address Register */ +#define SPINOR_OP_SRSTEN 0x66 /* Software Reset Enable */ +#define SPINOR_OP_SRST 0x99 /* Software Reset */ /* 4-byte address opcodes - used on Spansion and some Macronix flashes. */ #define SPINOR_OP_READ_4B 0x13 /* Read data bytes (low frequency) */