[PATCH 2/3] i2c: enable async suspend/resume for i2c adapters

Rajat Jain
2021-10-25T21:35:46Z

Enable async suspend/resume of i2c adapters. It enormously helps with
reducing the resume time of systems (as much as 20%-40%) where I2C devices
can take significant time (100s of ms) to resume.

Signed-off-by: Rajat Jain <rajatja@google.com>
Tested-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
---
v2: Add Jarkko's tested by

drivers/i2c/i2c-core-base.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index 54964fbe3f03..8d4f2be54e17 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -1576,6 +1576,7 @@ static int i2c_register_adapter(struct i2c_adapter *adap)
if (res)
goto out_reg;

+ device_enable_async_suspend(&adap->dev);
pm_runtime_no_callbacks(&adap->dev);
pm_suspend_ignore_children(&adap->dev, true);
pm_runtime_enable(&adap->dev);
--
2.33.0.1079.g6e70778dc9-goog