linux-kernel - [PATCH i-g-t v7 1/1] usb: xhci: plat: Enable async suspend/resume

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Date:   Wed, 25 Jan 2017 12:51:28 -0500
From:   Robert Foss <robert.foss@...labora.com>
To:     mathias.nyman@...el.com, gregkh@...uxfoundation.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Julius Werner <jwerner@...omium.org>,
        Andrew Bresticker <abrestic@...omium.org>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Brian Norris <briannorris@...omium.org>,
        Baolin Wang <baolin.wang@...aro.org>
Cc:     Robert Foss <robert.foss@...labora.com>
Subject: [PATCH i-g-t v7 1/1] usb: xhci: plat: Enable async suspend/resume

From: Andrew Bresticker <abrestic@...omium.org>

USB host controllers can take a significant amount of time to suspend
and resume, adding several hundred miliseconds to the kernel resume
time. Since the XHCI controller has no outside dependencies (other than
clocks, which are suspended late/resumed early), allow it to suspend and
resume asynchronously.

Signed-off-by: Andrew Bresticker <abrestic@...omium.org>
Tested-by: Andrew Bresticker <abrestic@...omium.org>
Tested-by: Robert Foss <robert.foss@...labora.com>
Signed-off-by: Robert Foss <robert.foss@...labora.com>
---
 drivers/usb/host/xhci-plat.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index 3cf8e120c620..4d6741a0d8f8 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -257,6 +257,7 @@ static int xhci_plat_probe(struct platform_device *pdev)
 
 	pm_runtime_set_active(&pdev->dev);
 	pm_runtime_enable(&pdev->dev);
+	device_enable_async_suspend(&pdev->dev);
 
 	return 0;
 
-- 
2.11.0.453.g787f75f05