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Commit 1fc2fe20 authored by Mika Westerberg's avatar Mika Westerberg Committed by Wolfram Sang
Browse files

i2c: designware: Add runtime PM hooks 



It is possible that after entering runtime PM suspend the controller
context is lost due the fact that its power is removed. This happens for
example on Asus T100, an Intel Baytrail based tablet/laptop.

In order to get the controller back to functional state, we need to
implement runtime PM hooks which will re-initialize the hardware during
runtime PM resume. We can re-use the existing system suspend hooks as the
steps to resume/suspend the controller are the same.

Signed-off-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent f537295a

drivers/i2c/busses/i2c-designware-platdrv.c

+5 −7
Original line number Diff line number Diff line
@@ -247,7 +247,7 @@ static const struct of_device_id dw_i2c_of_match[] = { 
MODULE_DEVICE_TABLE(of, dw_i2c_of_match);

#endif



#ifdef CONFIG_PM_SLEEP

#ifdef CONFIG_PM

static int dw_i2c_suspend(struct device *dev)

{

	struct platform_device *pdev = to_platform_device(dev);
@@ -269,13 +269,11 @@ static int dw_i2c_resume(struct device *dev) 


	return 0;

}



static SIMPLE_DEV_PM_OPS(dw_i2c_dev_pm_ops, dw_i2c_suspend, dw_i2c_resume);

#define DW_I2C_DEV_PM_OPS	(&dw_i2c_dev_pm_ops)

#else

#define DW_I2C_DEV_PM_OPS	NULL

#endif



static UNIVERSAL_DEV_PM_OPS(dw_i2c_dev_pm_ops, dw_i2c_suspend,

			    dw_i2c_resume, NULL);



/* work with hotplug and coldplug */

MODULE_ALIAS("platform:i2c_designware");
@@ -287,7 +285,7 @@ static struct platform_driver dw_i2c_driver = { 
		.owner	= THIS_MODULE,

		.of_match_table = of_match_ptr(dw_i2c_of_match),

		.acpi_match_table = ACPI_PTR(dw_i2c_acpi_match),

		.pm	= DW_I2C_DEV_PM_OPS,

		.pm	= &dw_i2c_dev_pm_ops,

	},

};