Add the callbacks to enable message-signaled interrupts for OHCI
controllers. At the moment, this must be explicitly enabled with
a module parameter.
Signed-off-by: Clemens Ladisch <clemens@xxxxxxxxxx>
---
drivers/usb/host/ohci-pci.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
--- a/drivers/usb/host/ohci-pci.c
+++ b/drivers/usb/host/ohci-pci.c
@@ -22,6 +22,11 @@
#include <linux/io.h>
+static int enable_msi;
+module_param(enable_msi, int, 0444);
+MODULE_PARM_DESC(enable_msi,
+ "enable message-signaled interrupts, 0=no, 1=yes");
+
/* constants used to work around PM-related transfer
* glitches in some AMD 700 series southbridges
*/
@@ -358,6 +363,22 @@ static const struct pci_device_id ohci_p
{},
};
+static int ohci_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 ohci_pci_cleanup_irq(struct usb_hcd *hcd)
+{
+ struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
+
+ pci_disable_msi(pdev);
+}
+
static int ohci_pci_reset (struct usb_hcd *hcd)
{
struct ohci_hcd *ohci = hcd_to_ohci (hcd);
@@ -468,6 +489,9 @@ static const struct hc_driver ohci_pci_h
.irq = ohci_irq,
.flags = HCD_MEMORY | HCD_USB11,
+ .pci_prepare_irq = ohci_pci_prepare_irq,
+ .pci_cleanup_irq = ohci_pci_cleanup_irq,
+
/*
* basic lifecycle operations
*/
--
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