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| author | Shubhrajyoti D <shubhrajyoti@ti.com> | 2012-03-26 17:04:22 +0530 |
|---|---|---|
| committer | Grant Likely <grant.likely@secretlab.ca> | 2012-04-10 14:10:51 -0600 |
| commit | 27b5284cfbe187732ebb184b03ea693f44837f9d (patch) | |
| tree | c68a049a77aaef421e3732e42b0bd5c359867918 /drivers/spi/spi-omap2-mcspi.c | |
| parent | 1bd897f84964c2ce3a28d11f7eb7c4e0a8d3ca3c (diff) | |
| download | lwn-27b5284cfbe187732ebb184b03ea693f44837f9d.tar.gz lwn-27b5284cfbe187732ebb184b03ea693f44837f9d.zip | |
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 <govindraj.raja@ti.com>
Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com>
Diffstat (limited to 'drivers/spi/spi-omap2-mcspi.c')
| -rw-r--r-- | 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 1907ed2e2958..0b0da2f7ce23 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) |