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Commit 026918e7 authored by Huang Shijie's avatar Huang Shijie Committed by Brian Norris
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mtd: nand: gpmi: add gpmi dsm supend/resume support 



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: default avatarHuang Shijie <b32955@freescale.com>
Signed-off-by: default avatarHan Xu <han.xu@freescale.com>
Signed-off-by: default avatarBrian Norris <computersforpeace@gmail.com>
parent 36bcc0c9

drivers/mtd/nand/gpmi-nand/gpmi-nand.c

+46 −1
Original line number Diff line number Diff line 
/*

 * 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
@@ -2033,9 +2033,54 @@ static int gpmi_nand_remove(struct platform_device *pdev) 
	return 0;

}



#ifdef CONFIG_PM_SLEEP

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;

}

#endif /* CONFIG_PM_SLEEP */



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,