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Commit b97b6621 authored by Mark Brown's avatar Mark Brown
Browse files

spi/s3c64xx: Implement runtime PM support 



Enable and disable the clocks to the SPI controller using runtime PM. This
serves the dual purpose of reducing power consumption a little and letting
the core know when the device is idle.

Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Acked-by: default avatarHeiko Stuebner <heiko@sntech.de>
parent e25d0bf9

drivers/spi/spi-s3c64xx.c

+39 −0
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ 
#include <linux/clk.h>

#include <linux/dma-mapping.h>

#include <linux/platform_device.h>

#include <linux/pm_runtime.h>

#include <linux/spi/spi.h>



#include <mach/dma.h>
@@ -782,6 +783,8 @@ static void s3c64xx_spi_work(struct work_struct *work) 
	while (!acquire_dma(sdd))

		msleep(10);



	pm_runtime_get_sync(&sdd->pdev->dev);



	spin_lock_irqsave(&sdd->lock, flags);



	while (!list_empty(&sdd->queue)
@@ -810,6 +813,8 @@ static void s3c64xx_spi_work(struct work_struct *work) 
	/* Free DMA channels */

	sdd->ops->release(sdd->rx_dma.ch, &s3c64xx_spi_dma_client);

	sdd->ops->release(sdd->tx_dma.ch, &s3c64xx_spi_dma_client);



	pm_runtime_put(&sdd->pdev->dev);

}



static int s3c64xx_spi_transfer(struct spi_device *spi,
@@ -892,6 +897,8 @@ static int s3c64xx_spi_setup(struct spi_device *spi) 
		goto setup_exit;

	}



	pm_runtime_get_sync(&sdd->pdev->dev);



	/* Check if we can provide the requested rate */

	if (!sci->clk_from_cmu) {

		u32 psr, speed;
@@ -924,6 +931,8 @@ static int s3c64xx_spi_setup(struct spi_device *spi) 
			err = -EINVAL;

	}



	pm_runtime_put(&sdd->pdev->dev);



setup_exit:



	/* setup() returns with device de-selected */
@@ -1164,6 +1173,8 @@ static int __init s3c64xx_spi_probe(struct platform_device *pdev) 
					mem_res->end, mem_res->start,

					sdd->rx_dma.dmach, sdd->tx_dma.dmach);



	pm_runtime_enable(&pdev->dev);



	return 0;



err9:
@@ -1197,6 +1208,8 @@ static int s3c64xx_spi_remove(struct platform_device *pdev) 
	struct resource	*mem_res;

	unsigned long flags;



	pm_runtime_disable(&pdev->dev);



	spin_lock_irqsave(&sdd->lock, flags);

	sdd->state |= SUSPND;

	spin_unlock_irqrestore(&sdd->lock, flags);
@@ -1277,8 +1290,34 @@ static int s3c64xx_spi_resume(struct device *dev) 
}

#endif /* CONFIG_PM */



#ifdef CONFIG_PM_RUNTIME

static int s3c64xx_spi_runtime_suspend(struct device *dev)

{

	struct spi_master *master = spi_master_get(dev_get_drvdata(dev));

	struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);



	clk_disable(sdd->clk);

	clk_disable(sdd->src_clk);



	return 0;

}



static int s3c64xx_spi_runtime_resume(struct device *dev)

{

	struct spi_master *master = spi_master_get(dev_get_drvdata(dev));

	struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);



	clk_enable(sdd->src_clk);

	clk_enable(sdd->clk);



	return 0;

}

#endif /* CONFIG_PM_RUNTIME */



static const struct dev_pm_ops s3c64xx_spi_pm = {

	SET_SYSTEM_SLEEP_PM_OPS(s3c64xx_spi_suspend, s3c64xx_spi_resume)

	SET_RUNTIME_PM_OPS(s3c64xx_spi_runtime_suspend,

			   s3c64xx_spi_runtime_resume, NULL)

};



static struct platform_driver s3c64xx_spi_driver = {