mirror of https://gitee.com/openkylin/linux.git
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: 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:
parent
e25d0bf917
commit
b97b662174
|
@ -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 = {
|
||||
|
|
Loading…
Reference in New Issue