linux-kernel - [PATCH 7/7] i2c-designware: switch to use runtime PM autosuspend

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Date:	Thu, 21 Mar 2013 14:10:00 +0200
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-i2c@...r.kernel.org, Wolfram Sang <wsa@...-dreams.de>,
	ben-linux@...ff.org, Jean Delvare <khali@...ux-fr.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Christian Ruppert <christian.ruppert@...lis.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: [PATCH 7/7] i2c-designware: switch to use runtime PM autosuspend

Using autosuspend helps to reduce the resume latency in situations where
another I2C message is going to be started soon. For example with HID over
I2C touch panels we get several messages in a short period of time while
the touch panel is in use.

Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
---
 drivers/i2c/busses/i2c-designware-core.c    |    3 ++-
 drivers/i2c/busses/i2c-designware-pcidrv.c  |    3 ++-
 drivers/i2c/busses/i2c-designware-platdrv.c |    3 ++-
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/i2c/busses/i2c-designware-core.c b/drivers/i2c/busses/i2c-designware-core.c
index 0849648..71d33e6 100644
--- a/drivers/i2c/busses/i2c-designware-core.c
+++ b/drivers/i2c/busses/i2c-designware-core.c
@@ -595,7 +595,8 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
 	ret = -EIO;
 
 done:
-	pm_runtime_put(dev->dev);
+	pm_runtime_mark_last_busy(dev->dev);
+	pm_runtime_put_autosuspend(dev->dev);
 	mutex_unlock(&dev->lock);
 
 	return ret;
diff --git a/drivers/i2c/busses/i2c-designware-pcidrv.c b/drivers/i2c/busses/i2c-designware-pcidrv.c
index aacb64e..c8797e2 100644
--- a/drivers/i2c/busses/i2c-designware-pcidrv.c
+++ b/drivers/i2c/busses/i2c-designware-pcidrv.c
@@ -291,7 +291,8 @@ static int i2c_dw_pci_probe(struct pci_dev *pdev,
 	/* Increase reference counter */
 	get_device(&pdev->dev);
 
-	pm_runtime_put_noidle(&pdev->dev);
+	pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
+	pm_runtime_use_autosuspend(&pdev->dev);
 	pm_runtime_allow(&pdev->dev);
 
 	return 0;
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index a22a852..46a25ca 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -175,9 +175,10 @@ static int dw_i2c_probe(struct platform_device *pdev)
 	/* Increase reference counter */
 	get_device(&pdev->dev);
 
+	pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
+	pm_runtime_use_autosuspend(&pdev->dev);
 	pm_runtime_set_active(&pdev->dev);
 	pm_runtime_enable(&pdev->dev);
-	pm_runtime_put(&pdev->dev);
 
 	return 0;
 }
-- 
1.7.10.4

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