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>

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 4a4cb1d91ac8465d5ff274f5ded1a62e299cf92f..da10dc728acb7b8c7586e498f2e794380bff29d8 100644 (file)
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -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);