linux-kernel - [PATCH] USB: ehci-pci: Check and enable wakeup capability

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Date:	Tue, 13 Sep 2011 16:14:21 -0700
From:	Sameer Nanda <snanda@...omium.org>
To:	stern@...land.harvard.edu, gregkh@...e.de
Cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Sameer Nanda <snanda@...omium.org>
Subject: [PATCH] USB: ehci-pci: Check and enable wakeup capability

If the PORTWAK register is implemented and at least one of the physical
ports is enabled for wakeup, enable wakeup for the ehci-pci device.

Signed-off-by: Sameer Nanda <snanda@...omium.org>
---
 drivers/usb/host/ehci-pci.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
index 1102ce6..ce6f784 100644
--- a/drivers/usb/host/ehci-pci.c
+++ b/drivers/usb/host/ehci-pci.c
@@ -285,6 +285,16 @@ static int ehci_pci_setup(struct usb_hcd *hcd)
 			dev_warn(&pdev->dev, "Enabling legacy PCI PM\n");
 			device_set_wakeup_capable(&pdev->dev, 1);
 		}
+	} else {
+		u16	port_wake;
+
+		pci_read_config_word(pdev, 0x62, &port_wake);
+
+		/* If PORTWAK register is implemented and at least one USB
+		 * port is enabled for wakeup, enable wakeup.
+		 */
+		if (port_wake & 0x0001 && port_wake & 0xfffe)
+			device_set_wakeup_enable(&pdev->dev, 1);
 	}
 
 #ifdef	CONFIG_USB_SUSPEND
-- 
1.7.3.1

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