linux-kernel - [PATCH 3.16 024/370] USB: UHCI: report non-PME wakeup signalling for Intel hardware

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Message-ID: <lsq.1489146382.76599174@decadent.org.uk>
Date:   Fri, 10 Mar 2017 11:46:22 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Bjorn Helgaas" <bhelgaas@...gle.com>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        "Alan Stern" <stern@...land.harvard.edu>
Subject: [PATCH 3.16 024/370] USB: UHCI: report non-PME wakeup signalling
 for Intel hardware

3.16.42-rc1 review patch.  If anyone has any objections, please let me know.

------------------

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

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: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/usb/host/uhci-pci.c | 4 ++++
 1 file changed, 4 insertions(+)

--- 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
 	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;