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Commit c3c5819a authored by Mathias Nyman's avatar Mathias Nyman Committed by Greg Kroah-Hartman
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xhci: call BIOS workaround to enable runtime suspend on Intel Braswell 



Intel xhci hw that require XHCI_PME_STUCK quirk have as default disabled
xhci from going to D3 state in runtime suspend. Driver needs to verify
it can deal with the hw by calling an ACPI _DSM method to get D3 enabled.

Signed-off-by: default avatarMathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent ed877b13

drivers/usb/host/xhci-pci.c

+17 −0
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ 
#include <linux/pci.h>

#include <linux/slab.h>

#include <linux/module.h>

#include <linux/acpi.h>



#include "xhci.h"

#include "xhci-trace.h"
@@ -190,6 +191,19 @@ static void xhci_pme_quirk(struct xhci_hcd *xhci) 
	readl(reg);

}



#ifdef CONFIG_ACPI

static void xhci_pme_acpi_rtd3_enable(struct pci_dev *dev)

{

	static const u8 intel_dsm_uuid[] = {

		0xb7, 0x0c, 0x34, 0xac,	0x01, 0xe9, 0xbf, 0x45,

		0xb7, 0xe6, 0x2b, 0x34, 0xec, 0x93, 0x1e, 0x23,

	};

	acpi_evaluate_dsm(ACPI_HANDLE(&dev->dev), intel_dsm_uuid, 3, 1, NULL);

}

#else

	static void xhci_pme_acpi_rtd3_enable(struct pci_dev *dev) { }

#endif /* CONFIG_ACPI */



/* called during probe() after chip reset completes */

static int xhci_pci_setup(struct usb_hcd *hcd)

{
@@ -263,6 +277,9 @@ static int xhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id) 
			HCC_MAX_PSA(xhci->hcc_params) >= 4)

		xhci->shared_hcd->can_do_streams = 1;



	if (xhci->quirks & XHCI_PME_STUCK_QUIRK)

		xhci_pme_acpi_rtd3_enable(dev);



	/* USB-2 and USB-3 roothubs initialized, allow runtime pm suspend */

	pm_runtime_put_noidle(&dev->dev);