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spi/atmel: add support for runtime PM 

Drivers should put the device into low power states proactively whenever the
device is not in use. Thus implement support for runtime PM and use the
autosuspend feature to make sure that we can still perform well in case we see
lots of SPI traffic within short period of time.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
hifive-unleashed-5.1
Wenyou Yang 2014-10-16 17:23:10 +08:00 committed by Mark Brown
parent 5398ad6897
commit ce0c4caf25
1 changed files with 61 additions and 7 deletions
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68
drivers/spi/spi-atmel.c
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@ -26,6 +26,7 @@
#include <linux/io.h>
#include <linux/gpio.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pm_runtime.h>
/* SPI register offsets */
#define SPI_CR 0x0000
@ -191,6 +192,8 @@
#define SPI_DMA_TIMEOUT (msecs_to_jiffies(1000))
#define AUTOSUSPEND_TIMEOUT 2000
struct atmel_spi_dma {
struct dma_chan *chan_rx;
struct dma_chan *chan_tx;
@ -1313,6 +1316,7 @@ static int atmel_spi_probe(struct platform_device *pdev)
master->setup = atmel_spi_setup;
master->transfer_one_message = atmel_spi_transfer_one_message;
master->cleanup = atmel_spi_cleanup;
master->auto_runtime_pm = true;
platform_set_drvdata(pdev, master);
as = spi_master_get_devdata(master);
@ -1385,6 +1389,11 @@ static int atmel_spi_probe(struct platform_device *pdev)
dev_info(&pdev->dev, "Atmel SPI Controller at 0x%08lx (irq %d)\n",
(unsigned long)regs->start, irq);
pm_runtime_set_autosuspend_delay(&pdev->dev, AUTOSUSPEND_TIMEOUT);
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
ret = devm_spi_register_master(&pdev->dev, master);
if (ret)
goto out_free_dma;
@ -1392,6 +1401,9 @@ static int atmel_spi_probe(struct platform_device *pdev)
return 0;
out_free_dma:
pm_runtime_disable(&pdev->dev);
pm_runtime_set_suspended(&pdev->dev);
if (as->use_dma)
atmel_spi_release_dma(as);
@ -1413,6 +1425,8 @@ static int atmel_spi_remove(struct platform_device *pdev)
struct spi_master *master = platform_get_drvdata(pdev);
struct atmel_spi *as = spi_master_get_devdata(master);
pm_runtime_get_sync(&pdev->dev);
/* reset the hardware and block queue progress */
spin_lock_irq(&as->lock);
if (as->use_dma) {
@ -1430,9 +1444,13 @@ static int atmel_spi_remove(struct platform_device *pdev)
clk_disable_unprepare(as->clk);
pm_runtime_put_noidle(&pdev->dev);
pm_runtime_disable(&pdev->dev);
return 0;
}
#ifdef CONFIG_PM
#ifdef CONFIG_PM_SLEEP
static int atmel_spi_suspend(struct device *dev)
{
@ -1447,9 +1465,10 @@ static int atmel_spi_suspend(struct device *dev)
return ret;
}
clk_disable_unprepare(as->clk);
pinctrl_pm_select_sleep_state(dev);
if (!pm_runtime_suspended(dev)) {
clk_disable_unprepare(as->clk);
pinctrl_pm_select_sleep_state(dev);
}
return 0;
}
@ -1460,9 +1479,12 @@ static int atmel_spi_resume(struct device *dev)
struct atmel_spi *as = spi_master_get_devdata(master);
int ret;
pinctrl_pm_select_default_state(dev);
clk_prepare_enable(as->clk);
if (!pm_runtime_suspended(dev)) {
pinctrl_pm_select_default_state(dev);
ret = clk_prepare_enable(as->clk);
if (ret)
return ret;
}
/* Start the queue running */
ret = spi_master_resume(master);
@ -1471,9 +1493,41 @@ static int atmel_spi_resume(struct device *dev)
return ret;
}
#endif
static SIMPLE_DEV_PM_OPS(atmel_spi_pm_ops, atmel_spi_suspend, atmel_spi_resume);
#ifdef CONFIG_PM_RUNTIME
static int atmel_spi_runtime_suspend(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
struct atmel_spi *as = spi_master_get_devdata(master);
clk_disable_unprepare(as->clk);
pinctrl_pm_select_sleep_state(dev);
return 0;
}
static int atmel_spi_runtime_resume(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
struct atmel_spi *as = spi_master_get_devdata(master);
int ret;
pinctrl_pm_select_default_state(dev);
ret = clk_prepare_enable(as->clk);
if (ret)
return ret;
return 0;
}
#endif
static const struct dev_pm_ops atmel_spi_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(atmel_spi_suspend, atmel_spi_resume)
SET_RUNTIME_PM_OPS(atmel_spi_runtime_suspend,
atmel_spi_runtime_resume, NULL)
};
#define ATMEL_SPI_PM_OPS (&atmel_spi_pm_ops)
#else
#define ATMEL_SPI_PM_OPS NULL