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

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Message-Id: <20211025213532.2349161-3-rajatja@google.com>
Date:   Mon, 25 Oct 2021 14:35:30 -0700
From:   Rajat Jain <rajatja@...gle.com>
To:     Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Wolfram Sang <wsa@...nel.org>, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        dtor@...gle.com
Cc:     Rajat Jain <rajatja@...gle.com>, rajatxjain@...il.com,
        dbasehore@...omium.org
Subject: [PATCH 2/3] i2c: enable async suspend/resume for i2c adapters

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@...gle.com>
Tested-by: Jarkko Nikula <jarkko.nikula@...ux.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