linux-kernel - [PATCH 2/2] mmc/sdhci-acpi: enable sdhci-acpi device to suspend/resume asynchronously

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Message-ID: <56815841.80901@linux.intel.com>
Date:	Mon, 28 Dec 2015 23:41:53 +0800
From:	"Fu, Zhonghui" <zhonghui.fu@...ux.intel.com>
To:	Ulf Hansson <ulf.hansson@...aro.org>
Cc:	Adrian Hunter <adrian.hunter@...el.com>, michele.curti@...il.com,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/2] 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 dependency between devices. This patch
enables sdhci-acpi devices 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 1089ms, and the
system resume time is reduced from 940ms to 908ms.

Signed-off-by: Zhonghui Fu <zhonghui.fu@...ux.intel.com>
---
 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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