linux-kernel - [PATCH v2] i2c/designware: enable i2c controller to suspend/resume asynchronously

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Date:	Thu, 24 Sep 2015 15:10:33 +0800
From:	"Fu, Zhonghui" <zhonghui.fu@...ux.intel.com>
To:	wsa@...-dreams.de,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	christian.ruppert@...tech.com, atull@...nsource.altera.com,
	jszhang@...vell.com, raymond.tan@...el.com,
	Romain.Baeriswyl@...lis.com, carlpeng008@...il.com,
	david.e.box@...ux.intel.com, Alexey.Brodkin@...opsys.com
CC:	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] i2c/designware: enable i2c controller to suspend/resume
 asynchronously

Now, PM core supports asynchronous suspend/resume mode for devices
during system suspend/resume, and the power state transition of one
device may be completed in separate kernel thread. PM core ensures
all power state transition timing dependency between devices. This
patch enables i2c controller to suspend/resume asynchronously. This
will take advantage of multicore and improve system suspend/resume
speed.

Signed-off-by: Zhonghui Fu <zhonghui.fu@...ux.intel.com>
---
Changes in v2:
- Amend commit message.

 drivers/i2c/busses/i2c-designware-platdrv.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index 3dd2de3..fec0fce 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -245,6 +245,7 @@ static int dw_i2c_probe(struct platform_device *pdev)
 
 	adap = &dev->adapter;
 	i2c_set_adapdata(adap, dev);
+	device_enable_async_suspend(&pdev->dev);
 	adap->owner = THIS_MODULE;
 	adap->class = I2C_CLASS_DEPRECATED;
 	strlcpy(adap->name, "Synopsys DesignWare I2C adapter",
-- 1.7.1

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