linux-kernel - [PATCH] usb: xhci-plat: Enable USB 2.0 hardware LPM support for platform xHCs

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Message-Id: <1377040909-18428-1-git-send-email-jwerner@chromium.org>
Date:	Tue, 20 Aug 2013 16:21:49 -0700
From:	Julius Werner <jwerner@...omium.org>
To:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Vincent Palatin <vpalatin@...omium.org>,
	Benson Leung <bleung@...omium.org>,
	Julius Werner <jwerner@...omium.org>
Subject: [PATCH] usb: xhci-plat: Enable USB 2.0 hardware LPM support for platform xHCs

The driver methods required for hardware LPM have only been added to the
PCI version of the XHCI driver, for no apparent reason. They seem to
work just as well with the platform driver, so let's add them to give
more devices the chance for additional power savings. Tested on the DWC3
xHC of an Exynos5420.

Signed-off-by: Julius Werner <jwerner@...omium.org>
---
 drivers/usb/host/xhci-plat.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index 51e22bf..7f46b5d 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -80,6 +80,10 @@ static const struct hc_driver xhci_plat_xhci_driver = {
 	.hub_status_data =	xhci_hub_status_data,
 	.bus_suspend =		xhci_bus_suspend,
 	.bus_resume =		xhci_bus_resume,
+
+	/* LPM support */
+	.update_device =	xhci_update_device,
+	.set_usb2_hw_lpm =	xhci_set_usb2_hardware_lpm,
 };
 
 static int xhci_plat_probe(struct platform_device *pdev)
-- 
1.7.12.4

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