From: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
This patch has been added to the 3.18 stable tree. If you have any
objections, please let us know.
===============
[ Upstream commit c3c5819a350952439c3198aa46581f9e4c46557f ]
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@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
---
drivers/usb/host/xhci-pci.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 7e5c90e..18aeda8 100644
--- 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"
@@ -184,6 +185,19 @@ 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);
--
2.5.0
--
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