From: Rick <rtseng@xxxxxxxxxx>
NVIDIA 3.1 xHCI card would lose power when moving power state into D3Cold.
Thus we need to wait CNR bit to clear when xhci resmue as xhci init.
Signed-off-by: Rick <rtseng@xxxxxxxxxx>
---
drivers/usb/host/xhci-pci.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 1e0236e..857ad8a 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -12,6 +12,7 @@
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/acpi.h>
+#include <linux/iopoll.h>
#include "xhci.h"
#include "xhci-trace.h"
@@ -455,6 +456,19 @@ static void xhci_pme_quirk(struct usb_hcd *hcd)
readl(reg);
}
+static int xhci_poll_cnr(struct usb_hcd *hcd)
+{
+ struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+ void __iomem *reg = &xhci->op_regs->status;
+ u32 result;
+ int ret;
+
+ ret = readl_poll_timeout_atomic(reg, result,
+ (result & STS_CNR) == 0,
+ 1, 100 * 1000);
+ return ret;
+}
+
static int xhci_pci_suspend(struct usb_hcd *hcd, bool do_wakeup)
{
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
@@ -508,6 +522,12 @@ static int xhci_pci_resume(struct usb_hcd *hcd, bool hibernated)
if (pdev->vendor == PCI_VENDOR_ID_INTEL)
usb_enable_intel_xhci_ports(pdev);
+ if (pdev->vendor == PCI_VENDOR_ID_NVIDIA) {
+ retval = xhci_poll_cnr(hcd);
+ if (retval != 0)
+ return retval;
+ }
+
if (xhci->quirks & XHCI_SSIC_PORT_UNUSED)
xhci_ssic_port_unused_quirk(hcd, false);
--
2.1.4
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