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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>
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1 changed files with 39 additions and 0 deletions
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@ -25,6 +25,7 @@
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#include <linux/clk.h>
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#include <linux/dma-mapping.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/spi/spi.h>
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#include <mach/dma.h>
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@ -782,6 +783,8 @@ static void s3c64xx_spi_work(struct work_struct *work)
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while (!acquire_dma(sdd))
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msleep(10);
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pm_runtime_get_sync(&sdd->pdev->dev);
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spin_lock_irqsave(&sdd->lock, flags);
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while (!list_empty(&sdd->queue)
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@ -810,6 +813,8 @@ static void s3c64xx_spi_work(struct work_struct *work)
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/* Free DMA channels */
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sdd->ops->release(sdd->rx_dma.ch, &s3c64xx_spi_dma_client);
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sdd->ops->release(sdd->tx_dma.ch, &s3c64xx_spi_dma_client);
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pm_runtime_put(&sdd->pdev->dev);
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}
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static int s3c64xx_spi_transfer(struct spi_device *spi,
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@ -892,6 +897,8 @@ static int s3c64xx_spi_setup(struct spi_device *spi)
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goto setup_exit;
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}
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pm_runtime_get_sync(&sdd->pdev->dev);
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/* Check if we can provide the requested rate */
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if (!sci->clk_from_cmu) {
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u32 psr, speed;
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@ -924,6 +931,8 @@ static int s3c64xx_spi_setup(struct spi_device *spi)
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err = -EINVAL;
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}
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pm_runtime_put(&sdd->pdev->dev);
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setup_exit:
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/* setup() returns with device de-selected */
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@ -1164,6 +1173,8 @@ static int __init s3c64xx_spi_probe(struct platform_device *pdev)
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mem_res->end, mem_res->start,
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sdd->rx_dma.dmach, sdd->tx_dma.dmach);
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pm_runtime_enable(&pdev->dev);
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return 0;
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err9:
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@ -1197,6 +1208,8 @@ static int s3c64xx_spi_remove(struct platform_device *pdev)
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struct resource *mem_res;
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unsigned long flags;
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pm_runtime_disable(&pdev->dev);
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spin_lock_irqsave(&sdd->lock, flags);
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sdd->state |= SUSPND;
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spin_unlock_irqrestore(&sdd->lock, flags);
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@ -1277,8 +1290,34 @@ static int s3c64xx_spi_resume(struct device *dev)
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}
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#endif /* CONFIG_PM */
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#ifdef CONFIG_PM_RUNTIME
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static int s3c64xx_spi_runtime_suspend(struct device *dev)
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{
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struct spi_master *master = spi_master_get(dev_get_drvdata(dev));
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struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
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clk_disable(sdd->clk);
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clk_disable(sdd->src_clk);
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return 0;
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}
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static int s3c64xx_spi_runtime_resume(struct device *dev)
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{
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struct spi_master *master = spi_master_get(dev_get_drvdata(dev));
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struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
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clk_enable(sdd->src_clk);
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clk_enable(sdd->clk);
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return 0;
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}
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#endif /* CONFIG_PM_RUNTIME */
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static const struct dev_pm_ops s3c64xx_spi_pm = {
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SET_SYSTEM_SLEEP_PM_OPS(s3c64xx_spi_suspend, s3c64xx_spi_resume)
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SET_RUNTIME_PM_OPS(s3c64xx_spi_runtime_suspend,
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s3c64xx_spi_runtime_resume, NULL)
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};
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static struct platform_driver s3c64xx_spi_driver = {
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