diff options
| author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2011-12-04 00:58:06 +0000 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-01-21 13:10:08 +0000 |
| commit | b97b662174162b44944abd0fa9faea50006ba711 (patch) | |
| tree | 6097e95949df64f7504bff8f09c100a0cd33d2bd /drivers/spi | |
| parent | e25d0bf917e8f3b6b5bafdc2fe666ca81eb9099d (diff) | |
| download | linux-b97b662174162b44944abd0fa9faea50006ba711.tar.bz2 | |
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>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi-s3c64xx.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c index 56dbdf15cba1..b0b843b321bb 100644 --- a/drivers/spi/spi-s3c64xx.c +++ b/drivers/spi/spi-s3c64xx.c @@ -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 = { |