aboutsummaryrefslogtreecommitdiff
path: root/drivers/spi/spi-omap2-mcspi.c
diff options
context:
space:
mode:
authorShubhrajyoti D <shubhrajyoti@ti.com>2012-03-26 17:04:22 +0530
committerGrant Likely <grant.likely@secretlab.ca>2012-04-10 14:10:51 -0600
commit27b5284cfbe187732ebb184b03ea693f44837f9d (patch)
treec68a049a77aaef421e3732e42b0bd5c359867918 /drivers/spi/spi-omap2-mcspi.c
parent1bd897f84964c2ce3a28d11f7eb7c4e0a8d3ca3c (diff)
downloadlinux-27b5284cfbe187732ebb184b03ea693f44837f9d.tar.gz
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.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/spi/spi-omap2-mcspi.c b/drivers/spi/spi-omap2-mcspi.c
index 1907ed2e295..0b0da2f7ce2 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)