linux-kernel - [PATCH v2 1/3] i2c: designware: Enable async suspend / resume of designware devices

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Message-Id: <20211025213532.2349161-2-rajatja@google.com>
Date:   Mon, 25 Oct 2021 14:35:29 -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 v2 1/3] i2c: designware: Enable async suspend / resume of
 designware devices

Mark the designware devices for asynchronous suspend. With this, the
resume for designware devices does not get stuck behind other unrelated
devices (e.g. intel_backlight that takes hundreds of ms to resume,
waiting for its parent devices).

Signed-off-by: Rajat Jain <rajatja@...gle.com>
Acked-by: Jarkko Nikula <jarkko.nikula@...ux.intel.com>
Tested-by: Jarkko Nikula <jarkko.nikula@...ux.intel.com>
---
v2: Add Jarkko's ack / tested by

 drivers/i2c/busses/i2c-designware-platdrv.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index 21113665ddea..2bd81abc86f6 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -293,6 +293,8 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
 					DPM_FLAG_MAY_SKIP_RESUME);
 	}
 
+	device_enable_async_suspend(&pdev->dev);
+
 	/* The code below assumes runtime PM to be disabled. */
 	WARN_ON(pm_runtime_enabled(&pdev->dev));
 
-- 
2.33.0.1079.g6e70778dc9-goog