From patchwork Fri Feb 24 20:16:39 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kamal Dasu X-Patchwork-Id: 732291 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org 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 3vVMsQ2JvTz9s7K for ; Sat, 25 Feb 2017 07:19:54 +1100 (AEDT) Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="TFjDUMQn"; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="rLDdPdLs"; dkim-atps=neutral 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:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id: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=VlFOLE3QhVRqwMfoe0GCfOl2mFs+i8itTlPE+cL8BOM=; b=TFjDUMQnyARr4yFIxxlosL/10t jeRyWW/42v8oF/M+Jo87jyswAZhFcFaRaLHv+Wiv9bEdVFJVBZZOE5+48BDK1NXsIXOSeYac/DU9L Lh1QDabuTJYC1oPwcZV+Z7WUztrkMXVtUsSO26WA3Ako6qi0hTZw04FtNPsjUaFrCvHyzWZSdAFH6 tQZX4b+kK4NVV7kt0Gs892z7Tb8ZpfrYklRm8rIZYlASDZmGwXLjU/o+CC7Cl+RDqH78yy92WZhS2 Mf/Dri+Gh4KredM2JiLcX1enGavPnoFLlGTgRIVQtVnj7ZwXsE0uGaCRHg7yMVO3MW00pp4WBviW+ 6KpfjgJQ==; 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 1chMLD-0003Jo-4x; Fri, 24 Feb 2017 20:19:47 +0000 Received: from mail-qk0-x243.google.com ([2607:f8b0:400d:c09::243]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1chMJ6-0001q2-2g for linux-mtd@lists.infradead.org; Fri, 24 Feb 2017 20:17:39 +0000 Received: by mail-qk0-x243.google.com with SMTP id n127so4260115qkf.2 for ; Fri, 24 Feb 2017 12:17:18 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=djfu+x+snFojmGQ0OAon4wHt6+6Oh18S13VmrU+Lhcs=; b=rLDdPdLs4SXOFxtza2Pci4mWhWovjJcm1sDzUPqamJRfeBNvIBDXpjnpUmimFGiwZT sAA96TGzMsURbJxkc+/pcpTAXfpOTcOIbOY9q71MltWtLxCFTtguiks8EgrbMRz7PkWV K+J0nO7BF6quqWRM5Wu/w47l3YKb5/p0NboL2F+kT5P9NcmDW4xdgBjRAHRsN25/v5ot bvOolVOebOKN5frvhO6E1eTovznbdRNMBTThO1VJPY4z3auIOCJOy/jEg3M1RNaVJMC5 9ESnZldwBbEm5VDuSdcknXZLIieI1kDZH9PjzLC683Kd2/8V+t1DaTn2C/7iI0qe93nb 1ONw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=djfu+x+snFojmGQ0OAon4wHt6+6Oh18S13VmrU+Lhcs=; b=B8AuIDtT3nkHXKG0dHVs36f0428rBv1dL+G8jFZqJxLzsBY23DcYT4RFd/BmyAKqOP WywlSlBfmZZFvkAH/iIuvxENSqvpUm838kXqHURZiWSEGxBEdHrK07R1cmSn3e7Xqm3I IVaOO82eNszjkMiLL+/FmzfEDKtpVA62oYymhtRzcnq7EL7XvRwDt1MS5my8ADtmmfLN 3s19iQbwoxtCJwbftgaoLcE2kGM3RrNtr0Eft4rddXSbTWuFunNengf54QB3cJ2eHEH3 iavcmZV5m19UMbfNSsSoZT8kJZE99/jUeZahIjEvO3xp1PIqVmXTGtf31mCT9QPazXPz 6Oiw== X-Gm-Message-State: AMke39l/yojyVScXvdtcuVVDRYnJ/UN1iQnAYzAXhsmY2/LTStbVk7DNkD98FR9WJzVI/g== X-Received: by 10.55.156.129 with SMTP id f123mr5067819qke.8.1487967437919; Fri, 24 Feb 2017 12:17:17 -0800 (PST) Received: from mail.broadcom.com ([192.19.218.250]) by smtp.gmail.com with ESMTPSA id o190sm5418808qkc.65.2017.02.24.12.17.16 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 24 Feb 2017 12:17:17 -0800 (PST) From: Kamal Dasu To: linux-spi@vger.kernel.org, cyrille.pitchen@atmel.com, marex@denx.de, broonie@kernel.org Subject: [PATCH v6 3/3] mtd: spi-nor: Add spi-nor mtd suspend and resume handlers Date: Fri, 24 Feb 2017 15:16:39 -0500 Message-Id: <1487967399-28967-4-git-send-email-kdasu.kdev@gmail.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1487967399-28967-1-git-send-email-kdasu.kdev@gmail.com> References: <1487967399-28967-1-git-send-email-kdasu.kdev@gmail.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170224_121736_239675_5F06B640 X-CRM114-Status: GOOD ( 10.23 ) X-Spam-Score: -2.7 (--) X-Spam-Report: SpamAssassin version 3.4.1 on bombadil.infradead.org summary: Content analysis details: (-2.7 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [2607:f8b0:400d:c09:0:0:0:243 listed in] [list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (kdasu.kdev[at]gmail.com) -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid 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: bcm-kernel-feedback-list@broadcom.com, f.fainelli@gmail.com, linux-mtd@lists.infradead.org, Kamal Dasu MIME-Version: 1.0 Sender: "linux-mtd" Errors-To: linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org Implemented and populated spi-nor mtd PM handlers for suspend and resume ops. spi-nor suspend op set's the flash state to FL_PM_SUSPENDED state and resume op re-initializes spi-nor flash and set's flash state to FL_READY. The handlers ensures synchronization between the spi-nor and the mtd layer by calling spi_nor_get/release_device() and setting respective flash states. Signed-off-by: Kamal Dasu --- drivers/mtd/spi-nor/spi-nor.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c index 5363807..8e38895 100644 --- a/drivers/mtd/spi-nor/spi-nor.c +++ b/drivers/mtd/spi-nor/spi-nor.c @@ -1629,6 +1629,28 @@ int spi_nor_init(struct spi_nor *nor) } EXPORT_SYMBOL_GPL(spi_nor_init); +/* mtd suspend handler */ +static int spi_nor_suspend(struct mtd_info *mtd) +{ + return spi_nor_get_device(mtd, FL_PM_SUSPENDED); +} + +/* mtd resume handler */ +static void spi_nor_resume(struct mtd_info *mtd) +{ + struct spi_nor *nor = mtd_to_spi_nor(mtd); + struct device *dev = nor->dev; + + if (nor->state == FL_PM_SUSPENDED) { + /* re-initialize the nor chip */ + spi_nor_init(nor); + /* mtd can resume transfers */ + spi_nor_release_device(mtd); + } else { + dev_err(dev, "resume() called, chip not in suspended state\n"); + } +} + int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode) { const struct flash_info *info = NULL; @@ -1695,6 +1717,8 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode) mtd->size = info->sector_size * info->n_sectors; mtd->_erase = spi_nor_erase; mtd->_read = spi_nor_read; + mtd->_suspend = spi_nor_suspend; + mtd->_resume = spi_nor_resume; /* NOR protection support for STmicro/Micron chips and similar */ if (JEDEC_MFR(info) == SNOR_MFR_MICRON ||