From: Shubhrajyoti D Date: Mon, 26 Mar 2012 11:34:22 +0000 (+0530) Subject: spi: omap2-mcspi: add support for pm_runtime autosuspend X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=27b5284cfbe187732ebb184b03ea693f44837f9d;p=linux-beck.git spi: omap2-mcspi: add support for pm_runtime autosuspend Adds support for configuring the omap2-mcspi driver use autosuspend for runtime power management. This can reduce the latency in starting an spi transfer by not suspending the device immediately following completion of a transfer. If another transfer then takes place before the autosuspend timeout (2 secs), the call to resume the device can return immediately saving some save/ restore cycles. Acked-by: Govindraj.R Signed-off-by: Shubhrajyoti D --- diff --git a/drivers/spi/spi-omap2-mcspi.c b/drivers/spi/spi-omap2-mcspi.c index 1907ed2e2958..0b0da2f7ce23 100644 --- a/drivers/spi/spi-omap2-mcspi.c +++ b/drivers/spi/spi-omap2-mcspi.c @@ -44,6 +44,7 @@ #include #define OMAP2_MCSPI_MAX_FREQ 48000000 +#define SPI_AUTOSUSPEND_TIMEOUT 2000 #define OMAP2_MCSPI_REVISION 0x00 #define OMAP2_MCSPI_SYSSTATUS 0x14 @@ -265,7 +266,8 @@ static void omap2_mcspi_restore_ctx(struct omap2_mcspi *mcspi) } static void omap2_mcspi_disable_clocks(struct omap2_mcspi *mcspi) { - pm_runtime_put_sync(mcspi->dev); + pm_runtime_mark_last_busy(mcspi->dev); + pm_runtime_put_autosuspend(mcspi->dev); } static int omap2_mcspi_enable_clocks(struct omap2_mcspi *mcspi) @@ -1212,6 +1214,8 @@ static int __devinit omap2_mcspi_probe(struct platform_device *pdev) if (status < 0) goto dma_chnl_free; + pm_runtime_use_autosuspend(&pdev->dev); + pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT); pm_runtime_enable(&pdev->dev); if (status || omap2_mcspi_master_setup(mcspi) < 0)