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    Subject[PATCHv3 2/3] spi: omap2-mcspi: add support for pm_runtime autosuspend
    Date
    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 <govindraj.raja@ti.com>
    Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com>
    ---
    drivers/spi/spi-omap2-mcspi.c | 6 +++++-
    1 files changed, 5 insertions(+), 1 deletions(-)

    diff --git a/drivers/spi/spi-omap2-mcspi.c b/drivers/spi/spi-omap2-mcspi.c
    index 1907ed2..0b0da2f 100644
    --- a/drivers/spi/spi-omap2-mcspi.c
    +++ b/drivers/spi/spi-omap2-mcspi.c
    @@ -44,6 +44,7 @@
    #include <plat/mcspi.h>

    #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)
    --
    1.7.1


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