i2c: omap: switch over to autosuspend API

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

Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>

1 files changed, 10 insertions, 2 deletions

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index 6d38a570dc12..122f517c5bcb 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;