linux-kernel - [PATCH] i2c_hid: enable i2c-hid devices to suspend/resume asynchronously

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Message-ID: <573D2900.6090903@linux.intel.com>
Date:	Thu, 19 May 2016 10:46:24 +0800
From:	"Fu, Zhonghui" <zhonghui.fu@...ux.intel.com>
To:	Jiri Kosina <jikos@...nel.org>
Cc:	benjamin.tissoires@...hat.com, dtor@...omium.org,
	bleung@...omium.org,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	aduggan@...aptics.com, k.kozlowski@...sung.com,
	dianders@...omium.org, gabriele.mzt@...il.com,
	linux-input@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] i2c_hid: enable i2c-hid devices to suspend/resume
 asynchronously

i2c-hid devices' suspend/resume are usually time-consuming process.
For example, the touch controller(i2c-ATML1000:00) on ASUS T100 tablet
takes about 160ms for suspending and 120ms for resuming. This patch
enables i2c-hid devices to suspend/resume asynchronously. This will
take advantage of multicore and speed up system suspend/resume process.

Signed-off-by: Zhonghui Fu <zhonghui.fu@...ux.intel.com>
---
 drivers/hid/i2c-hid/i2c-hid.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c
index 2e021ba..cc41e1e 100644
--- a/drivers/hid/i2c-hid/i2c-hid.c
+++ b/drivers/hid/i2c-hid/i2c-hid.c
@@ -1020,6 +1020,7 @@ static int i2c_hid_probe(struct i2c_client *client,
 	pm_runtime_get_noresume(&client->dev);
 	pm_runtime_set_active(&client->dev);
 	pm_runtime_enable(&client->dev);
+	device_enable_async_suspend(&client->dev);
 
 	ret = i2c_hid_fetch_hid_descriptor(ihid);
 	if (ret < 0)
-- 1.7.1