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Commit b816ccc5 authored by Krzysztof Kozlowski's avatar Krzysztof Kozlowski Committed by Russell King
Browse files

ARM: 8206/1: dmaengine: pl330: Add PM sleep support 



Add system suspend/resume capabilities to the pl330 driver so the amba
bus clock could be also unprepared to conserve energy.

Signed-off-by: default avatarKrzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent ae43b328

drivers/dma/pl330.c

+41 −0
Original line number Diff line number Diff line
@@ -2627,6 +2627,46 @@ static int pl330_dma_device_slave_caps(struct dma_chan *dchan, 
	return 0;

}



/*

 * Runtime PM callbacks are provided by amba/bus.c driver.

 *

 * It is assumed here that IRQ safe runtime PM is chosen in probe and amba

 * bus driver will only disable/enable the clock in runtime PM callbacks.

 */

static int __maybe_unused pl330_suspend(struct device *dev)

{

	struct amba_device *pcdev = to_amba_device(dev);



	pm_runtime_disable(dev);



	if (!pm_runtime_status_suspended(dev)) {

		/* amba did not disable the clock */

		amba_pclk_disable(pcdev);

	}

	amba_pclk_unprepare(pcdev);



	return 0;

}



static int __maybe_unused pl330_resume(struct device *dev)

{

	struct amba_device *pcdev = to_amba_device(dev);

	int ret;



	ret = amba_pclk_prepare(pcdev);

	if (ret)

		return ret;



	if (!pm_runtime_status_suspended(dev))

		ret = amba_pclk_enable(pcdev);



	pm_runtime_enable(dev);



	return ret;

}



static SIMPLE_DEV_PM_OPS(pl330_pm, pl330_suspend, pl330_resume);



static int

pl330_probe(struct amba_device *adev, const struct amba_id *id)

{
@@ -2852,6 +2892,7 @@ static struct amba_driver pl330_driver = { 
	.drv = {

		.owner = THIS_MODULE,

		.name = "dma-pl330",

		.pm = &pl330_pm,

	},

	.id_table = pl330_ids,

	.probe = pl330_probe,