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Commit 27b5284c authored by Shubhrajyoti D's avatar Shubhrajyoti D Committed by Grant Likely
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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: default avatarGovindraj.R <govindraj.raja@ti.com>
Signed-off-by: default avatarShubhrajyoti D <shubhrajyoti@ti.com>
parent 1bd897f8

drivers/spi/spi-omap2-mcspi.c

+5 −1
Original line number Diff line number Diff line
@@ -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)