From: Niklas Neronin <niklas.neronin@xxxxxxxxxxxxxxx>
The current way the xhci driver sets up MSI interrupts is overly complex
and messy. The whole MSI setup can be done in one simple function.
Continue refactoring MSI/MSI-X setup by incorporating 'xhci_setup_msi()'
into 'xhci_try_enable_msi()'. Now all interrupt enabling is contained in
one function, which should make it easier to rework.
Signed-off-by: Niklas Neronin <niklas.neronin@xxxxxxxxxxxxxxx>
Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
---
drivers/usb/host/xhci-pci.c | 49 ++++++++++++-------------------------
1 file changed, 15 insertions(+), 34 deletions(-)
diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 370943c04881..dbec0a315566 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -116,35 +116,6 @@ static void xhci_cleanup_msix(struct xhci_hcd *xhci)
hcd->msix_enabled = 0;
}
-/*
- * Set up MSI
- */
-static int xhci_setup_msi(struct xhci_hcd *xhci)
-{
- int ret;
- /*
- * TODO:Check with MSI Soc for sysdev
- */
- struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
-
- ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSI);
- if (ret < 0) {
- xhci_dbg_trace(xhci, trace_xhci_dbg_init,
- "failed to allocate MSI entry");
- return ret;
- }
-
- ret = request_irq(pdev->irq, xhci_msi_irq,
- 0, "xhci_hcd", xhci_to_hcd(xhci));
- if (ret) {
- xhci_dbg_trace(xhci, trace_xhci_dbg_init,
- "disable MSI interrupt");
- pci_free_irq_vectors(pdev);
- }
-
- return ret;
-}
-
static int xhci_try_enable_msi(struct usb_hcd *hcd)
{
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
@@ -194,13 +165,23 @@ static int xhci_try_enable_msi(struct usb_hcd *hcd)
return 0;
setup_msi:
- /* fall back to MSI */
- ret = xhci_setup_msi(xhci);
- if (!ret) {
- hcd->msi_enabled = 1;
- return 0;
+ /* TODO: Check with MSI Soc for sysdev */
+ ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSI);
+ if (ret < 0) {
+ xhci_dbg_trace(xhci, trace_xhci_dbg_init, "failed to allocate MSI entry");
+ goto legacy_irq;
}
+ ret = request_irq(pdev->irq, xhci_msi_irq, 0, "xhci_hcd", xhci_to_hcd(xhci));
+ if (ret) {
+ xhci_dbg_trace(xhci, trace_xhci_dbg_init, "disable MSI interrupt");
+ pci_free_irq_vectors(pdev);
+ goto legacy_irq;
+ }
+
+ hcd->msi_enabled = 1;
+ return 0;
+
legacy_irq:
if (!pdev->irq) {
xhci_err(xhci, "No msi-x/msi found and no IRQ in BIOS\n");
--
2.25.1
