diff mbox series

[3/8] usb: xhci: request MSI/-X according to requested amount

Message ID 20241017130508.1293021-4-niklas.neronin@linux.intel.com
State New
Headers show
Series usb: xhci: various xhci cleanups and improvements | expand

Commit Message

Niklas Neronin Oct. 17, 2024, 1:05 p.m. UTC
Variable 'max_interrupts' contains the maximum supported interrupters
or the maximum interrupters the user has requested. Thus, it should be
used instead of HCS_MAX_INTRS().

User set 'max_interrupts' value is validated in xhci_gen_setup(),
otherwise 'max_interrupts' value is 'HCS_MAX_INTRS(xhci->hcs_params1)'.

Signed-off-by: Niklas Neronin <niklas.neronin@linux.intel.com>
---
 drivers/usb/host/xhci-pci.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)
diff mbox series

Patch

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 295d3297ca3d..96bfd0897835 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -148,14 +148,11 @@  static int xhci_try_enable_msi(struct usb_hcd *hcd)
 	hcd->irq = 0;
 
 	/*
-	 * calculate number of MSI-X vectors supported.
-	 * - HCS_MAX_INTRS: the max number of interrupts the host can handle,
-	 *   with max number of interrupters based on the xhci HCSPARAMS1.
-	 * - num_online_cpus: maximum MSI-X vectors per CPUs core.
-	 *   Add additional 1 vector to ensure always available interrupt.
+	 * Calculate number of MSI/MSI-X vectors supported.
+	 * - max_interrupters: the max number of interrupts requested, capped to xhci HCSPARAMS1.
+	 * - num_online_cpus: one vector per CPUs core, with at least one overall.
 	 */
-	xhci->nvecs = min(num_online_cpus() + 1,
-			  HCS_MAX_INTRS(xhci->hcs_params1));
+	xhci->nvecs = min(num_online_cpus() + 1, xhci->max_interrupters);
 
 	/* TODO: Check with MSI Soc for sysdev */
 	xhci->nvecs = pci_alloc_irq_vectors(pdev, 1, xhci->nvecs,