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Tue, 18 Aug 2015 03:33:05 +0000 Received: from chopperman.am.freescale.net (chopperman.am.freescale.net [10.81.16.64]) by tx30smr01.am.freescale.net (8.14.3/8.14.0) with ESMTP id t7I3X4cO025052; Mon, 17 Aug 2015 20:33:04 -0700 From: Han Xu To: CC: , , , , , , , , , , Subject: [PATCH v2 1/6] mtd: nand: gpmi: add gpmi dsm supend/resume support Date: Mon, 17 Aug 2015 22:24:36 -0500 Message-ID: <1439868276-24748-1-git-send-email-b45815@freescale.com> X-Mailer: git-send-email 1.9.1 X-EOPAttributedMessage: 0 X-Microsoft-Exchange-Diagnostics: 1; BN1AFFO11FD028; 1:TSPFb21CjlsxsKB8m84aofW621Hy43VvFKtXDu1Az4uKZB5YOuD0EkTm6AfL7mJ0uJIqh7vGhMVFCvmHnJr205FbolbyXTSyjAX1YcCyqZxFEUa6aRI4BOV4994AnPcqltcAiUZibCA+X+p09w5FOWQfbhzDugyo+0eELsQHnsiR3+idubkCpIIc5VoXOHe+yC5FLrjvIoK/ktffyygjDeEtWwjAOJLggmlNat/fcpfRUWLpU8TFPpgeA54Q4qc3mjZBVOouAYlssam431CfQ0v1KY2Bzr6fio9hM+qjBhvia47HMF7WQOObXdZHvAVyUq4bwdoPgwOQSJbwlUCHQ3hx/MFewru6cCl2LNKs/Z9e5xeBJDPt+hDXVmsRlVYJbafemunsxF7pWLh7ArMWPA== X-Forefront-Antispam-Report: CIP:192.88.168.50; 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BY2PR03MB555; 5:JSnkGbQ/qRzK38POd3FSs8eb50a+pNHSgeDWhY87FUIefhaYee9kt6KGQe7cca9ZtMU9InQwk8Krf1rgBVU+YM+k+nlo2fnATnezNPnMz4o8W3EigoO7rCO44lkW2Eg1lJPemR1irzTZsEqKw+gpYA==; 24:1svYEJucCd0jeZlbnF+iVVXz5N5jxQ3QdJ8R9lBvBlBUa1CUSsGbMQqnflibBbMuovSRuB0xNOAWM5U6D/Yyan4WXvXFTrFAbz7Bz8nCGO0=; 20:rCxMd0705qXU7zcBK62G5NuYJG+isi050Ai9XkppfnEqoG5ntzkqD3zvOMCWss1NNpYYVuGBxLBajgwpvIZ7zA== X-OriginatorOrg: freescale.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Aug 2015 03:33:05.0258 (UTC) X-MS-Exchange-CrossTenant-Id: 710a03f5-10f6-4d38-9ff4-a80b81da590d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=710a03f5-10f6-4d38-9ff4-a80b81da590d; Ip=[192.88.168.50]; Helo=[tx30smr01.am.freescale.net] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY2PR03MB555 Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org X-Spam-Status: No, score=-7.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Huang Shijie i.MX6SX supports deep sleep mode(DSM) that may turn off GPMI/BCH power during suspend, add gpmi nand suspend/resume function to release DMA channel in suspend function and re-init GPMI/BCH controller during resume function. Although it is not necessary to restore GPMI/BCH registers value for i.MX6QDL, the code doesn't distinguish different platforms to keep the code simple. Signed-off-by: Huang Shijie Signed-off-by: Han Xu --- drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 45 +++++++++++++++++++++++++++++++++- 1 file changed, 44 insertions(+), 1 deletion(-) diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c index 1b8f350..dfd0ba1 100644 --- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c +++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c @@ -1,7 +1,7 @@ /* * Freescale GPMI NAND Flash Driver * - * Copyright (C) 2010-2011 Freescale Semiconductor, Inc. + * Copyright (C) 2010-2015 Freescale Semiconductor, Inc. * Copyright (C) 2008 Embedded Alley Solutions, Inc. * * This program is free software; you can redistribute it and/or modify @@ -2036,9 +2036,52 @@ static int gpmi_nand_remove(struct platform_device *pdev) return 0; } +static int gpmi_pm_suspend(struct device *dev) +{ + struct gpmi_nand_data *this = dev_get_drvdata(dev); + + release_dma_channels(this); + return 0; +} + +static int gpmi_pm_resume(struct device *dev) +{ + struct gpmi_nand_data *this = dev_get_drvdata(dev); + int ret; + + ret = acquire_dma_channels(this); + if (ret < 0) + return ret; + + /* re-init the GPMI registers */ + this->flags &= ~GPMI_TIMING_INIT_OK; + ret = gpmi_init(this); + if (ret) { + dev_err(this->dev, "Error setting GPMI : %d\n", ret); + return ret; + } + + /* re-init the BCH registers */ + ret = bch_set_geometry(this); + if (ret) { + dev_err(this->dev, "Error setting BCH : %d\n", ret); + return ret; + } + + /* re-init others */ + gpmi_extra_init(this); + + return 0; +} + +static const struct dev_pm_ops gpmi_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(gpmi_pm_suspend, gpmi_pm_resume) +}; + static struct platform_driver gpmi_nand_driver = { .driver = { .name = "gpmi-nand", + .pm = &gpmi_pm_ops, .of_match_table = gpmi_nand_id_table, }, .probe = gpmi_nand_probe,