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spi/s3c64xx: Implement runtime PM support

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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: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Heiko Stuebner <heiko@sntech.de>
This commit is contained in:
Mark Brown 2011-12-04 00:58:06 +00:00
parent e25d0bf917
commit b97b662174
1 changed files with 39 additions and 0 deletions
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39
drivers/spi/spi-s3c64xx.c
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@ -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 = {