Add the callbacks to enable message-signaled interrupts for EHCI
controllers. At the moment, this must be explicitly enabled with
a module parameter.
Signed-off-by: Clemens Ladisch <clemens@xxxxxxxxxx>
---
drivers/usb/host/ehci-pci.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
--- a/drivers/usb/host/ehci-pci.c
+++ b/drivers/usb/host/ehci-pci.c
@@ -22,8 +22,29 @@
#error "This file is PCI bus glue. CONFIG_PCI must be defined."
#endif
+static int enable_msi;
+module_param(enable_msi, int, 0444);
+MODULE_PARM_DESC(enable_msi,
+ "enable message-signaled interrupts, 0=no, 1=yes");
+
/*-------------------------------------------------------------------------*/
+static int ehci_pci_prepare_irq(struct usb_hcd *hcd)
+{
+ struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
+
+ if (enable_msi)
+ pci_enable_msi(pdev);
+ return 0;
+}
+
+static void ehci_pci_cleanup_irq(struct usb_hcd *hcd)
+{
+ struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
+
+ pci_disable_msi(pdev);
+}
+
/* called after powerup, by probe or system-pm "wakeup" */
static int ehci_pci_reinit(struct ehci_hcd *ehci, struct pci_dev *pdev)
{
@@ -394,6 +415,9 @@ static const struct hc_driver ehci_pci_h
.irq = ehci_irq,
.flags = HCD_MEMORY | HCD_USB2,
+ .pci_prepare_irq = ehci_pci_prepare_irq,
+ .pci_cleanup_irq = ehci_pci_cleanup_irq,
+
/*
* basic lifecycle operations
*/
--
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