[PATCHv7,22/23] i2c: omap: switch over to autosuspend API

Commit Message

Shubhrajyoti Datta Sept. 11, 2012, 9:42 a.m. UTC

From: Felipe Balbi <[e-mail]>

this helps us reduce unnecessary pm transitions
in case we have another i2c message starting soon.

Signed-off-by: Felipe Balbi <[e-mail]>
Signed-off-by: Shubhrajyoti D <[e-mail]>
---
 drivers/i2c/busses/i2c-omap.c |   12 ++++++++++--
 1 files changed, 10 insertions(+), 2 deletions(-)

Patch

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index 6d38a57..122f517 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -55,6 +55,9 @@ 
 /* timeout waiting for the controller to respond */
 #define OMAP_I2C_TIMEOUT (msecs_to_jiffies(1000))
 
+/* timeout for pm runtime autosuspend */
+#define OMAP_I2C_PM_TIMEOUT		1000	/* ms */
+
 /* For OMAP3 I2C_IV has changed to I2C_WE (wakeup enable) */
 enum {
 	OMAP_I2C_REV_REG = 0,
@@ -645,7 +648,8 @@  omap_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
 
 	omap_i2c_wait_for_bb(dev);
 out:
-	pm_runtime_put(dev->dev);
+	pm_runtime_mark_last_busy(dev->dev);
+	pm_runtime_put_autosuspend(dev->dev);
 	return r;
 }
 
@@ -1113,6 +1117,9 @@  omap_i2c_probe(struct platform_device *pdev)
 		dev->regs = (u8 *)reg_map_ip_v1;
 
 	pm_runtime_enable(dev->dev);
+	pm_runtime_set_autosuspend_delay(dev->dev, OMAP_I2C_PM_TIMEOUT);
+	pm_runtime_use_autosuspend(dev->dev);
+
 	r = pm_runtime_get_sync(dev->dev);
 	if (IS_ERR_VALUE(r))
 		goto err_free_mem;
@@ -1190,7 +1197,8 @@  omap_i2c_probe(struct platform_device *pdev)
 
 	of_i2c_register_devices(adap);
 
-	pm_runtime_put(dev->dev);
+	pm_runtime_mark_last_busy(dev->dev);
+	pm_runtime_put_autosuspend(dev->dev);
 
 	return 0;