From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-bn1bon0148.outbound.protection.outlook.com ([157.56.111.148] helo=na01-bn1-obe.outbound.protection.outlook.com) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZpM7a-0003V9-4O for linux-mtd@lists.infradead.org; Thu, 22 Oct 2015 20:06:00 +0000 From: Han Xu To: CC: , , , , , , , , , , Subject: [PATCH v6 1/7] mtd: nand: gpmi: add gpmi dsm supend/resume support Date: Thu, 22 Oct 2015 14:54:30 -0500 Message-ID: <1445543676-19876-2-git-send-email-b45815@freescale.com> In-Reply-To: <1445543676-19876-1-git-send-email-b45815@freescale.com> References: <1445543676-19876-1-git-send-email-b45815@freescale.com> MIME-Version: 1.0 Content-Type: text/plain List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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 2064ada..61a39cb 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, -- 1.9.1