linux-kernel - [PATCH 3.12 019/235] USB: UHCI: report non-PME wakeup signalling for Intel hardware

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Message-Id: <1d22fa3192dd0fc10f6f193e85993e42b451f663.1485514374.git.jslaby@suse.cz>
Date:   Fri, 27 Jan 2017 11:52:32 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Alan Stern <stern@...land.harvard.edu>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 019/235] USB: UHCI: report non-PME wakeup signalling for Intel hardware

From: Alan Stern <stern@...land.harvard.edu>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit ccdb6be9ec6580ef69f68949ebe26e0fb58a6fb0 upstream.

The UHCI controllers in Intel chipsets rely on a platform-specific non-PME
mechanism for wakeup signalling.  They can generate wakeup signals even
though they don't support PME.

We need to let the USB core know this so that it will enable runtime
suspend for UHCI controllers.

Signed-off-by: Alan Stern <stern@...land.harvard.edu>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/usb/host/uhci-pci.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/host/uhci-pci.c b/drivers/usb/host/uhci-pci.c
index 0f228c46eeda..ad458ef4b7e9 100644
--- a/drivers/usb/host/uhci-pci.c
+++ b/drivers/usb/host/uhci-pci.c
@@ -129,6 +129,10 @@ static int uhci_pci_init(struct usb_hcd *hcd)
 	if (to_pci_dev(uhci_dev(uhci))->vendor == PCI_VENDOR_ID_HP)
 		uhci->wait_for_hp = 1;
 
+	/* Intel controllers use non-PME wakeup signalling */
+	if (to_pci_dev(uhci_dev(uhci))->vendor == PCI_VENDOR_ID_INTEL)
+		device_set_run_wake(uhci_dev(uhci), 1);
+
 	/* Set up pointers to PCI-specific functions */
 	uhci->reset_hc = uhci_pci_reset_hc;
 	uhci->check_and_reset_hc = uhci_pci_check_and_reset_hc;
-- 
2.11.0