linux-kernel - [PATCH v3] mmc/sdhci-acpi: enable sdhci-acpi device to suspend/resume asynchronously

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Message-ID: <56497644.9080903@linux.intel.com>
Date:	Mon, 16 Nov 2015 14:23:00 +0800
From:	"Fu, Zhonghui" <zhonghui.fu@...ux.intel.com>
To:	Ulf Hansson <ulf.hansson@...aro.org>,
	Adrian Hunter <adrian.hunter@...el.com>, yunpeng.gao@...el.com,
	andriy.shevchenko@...ux.intel.com, peter.griffin@...aro.org
CC:	linux-mmc <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH v3] mmc/sdhci-acpi: enable sdhci-acpi device to suspend/resume
 asynchronously

Now, PM core supports asynchronous suspend/resume mode for devices
during system suspend/resume, and the power state transition of one
device may be completed in separate kernel thread. PM core ensures
all power state transition timing dependency between devices. This
patch enables sdhci-acpi device to suspend/resume asynchronously.
This will take advantage of multicore and improve system
suspend/resume speed. After enabling the sdhci-acpi devices and all
their child devices to suspend/resume asynchronously on ASUS T100TA,
the system suspend-to-idle time is reduced from 1645ms to 1096ms, and
the system resume time is reduced from 940ms to 908ms.

Signed-off-by: Zhonghui Fu <zhonghui.fu@...ux.intel.com>
---
Changes in v3:
- Add test result in commit message

 drivers/mmc/host/sdhci-acpi.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/mmc/host/sdhci-acpi.c b/drivers/mmc/host/sdhci-acpi.c
index f6047fc..3d27f2d 100644
--- a/drivers/mmc/host/sdhci-acpi.c
+++ b/drivers/mmc/host/sdhci-acpi.c
@@ -388,6 +388,8 @@ static int sdhci_acpi_probe(struct platform_device *pdev)
 		pm_runtime_enable(dev);
 	}

+	device_enable_async_suspend(dev);
+
 	return 0;

 err_free:
-- 1.7.1

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