diff mbox series

[v2,13/18] xhci: refactor static MSI function

Message ID 20231204104534.1335903-14-mathias.nyman@linux.intel.com
State New
Headers show
Series xhci features for usb-next | expand

Commit Message

Mathias Nyman Dec. 4, 2023, 10:45 a.m. UTC 
From: Niklas Neronin <niklas.neronin@linux.intel.com>

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@linux.intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
---
 drivers/usb/host/xhci-pci.c | 49 ++++++++++++-------------------------
 1 file changed, 15 insertions(+), 34 deletions(-)
diff mbox series

Patch

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");