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authorMika Westerberg <mika.westerberg@linux.intel.com>2014-05-15 18:37:23 +0400
committerWolfram Sang <wsa@the-dreams.de>2014-06-02 21:18:39 +0400
commit1fc2fe204cb9d8010e70716aa48b5c3db6379da3 (patch)
tree49ec06b9ace6dac7a955230865c2fb9dba0a7e3a /drivers/i2c
parentf537295a58ddc4460b9857c6e4a6959685447f3b (diff)
downloadlinux-1fc2fe204cb9d8010e70716aa48b5c3db6379da3.tar.xz
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: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/i2c-designware-platdrv.c12
1 files changed, 5 insertions, 7 deletions
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index f72102f389c5..402ec3970fed 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -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,
},
};