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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: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathias Nyman 2015-07-21 17:20:25 +03:00 committed by Greg Kroah-Hartman
parent ed877b130d
commit c3c5819a35
1 changed files with 17 additions and 0 deletions
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17
drivers/usb/host/xhci-pci.c
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@ -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);