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generic: 6.18: backport MHI IRQ vector allocation fix

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Fixes 5G modem issues in TCL LINKHUB HH500V introduced with 738876e
(torvalds/linux@2ef3886)

Signed-off-by: Milan Krstic <milan.krstic@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/22985
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
This commit is contained in:
Milan Krstic
2026-04-09 10:55:35 +00:00
committed by Hauke Mehrtens
parent 8dd0872659
commit 862a4edfa6
1 changed files with 30 additions and 0 deletions
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target/linux/generic/backport-6.18/706-v7.2-bus-mhi-host-pci_generic-round-up-nr_irqs-to-a-power-of-two.patch
+30
View File
@@ -0,0 +1,30 @@
From 86f6dc05ea051fa03ebc03174bc00f734593465d Mon Sep 17 00:00:00 2001
From: Javier Achirica <jachirica@gmail.com>
Date: Fri, 3 Apr 2026 12:30:03 +0200
Subject: bus: mhi: host: pci_generic: Round up nr_irqs to power of two
When an MHI device uses standard MSI, the PCI core requires the allocated
number of vectors to be a strict power of two. But devices will only ask
for the irqs they need, so they might not be properly aligned.
Make sure a power-of-2 number of vectors is requested.
Signed-off-by: Javier Achirica <jachirica@gmail.com>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
Link: https://patch.msgid.link/CACixm21q7b_diEx5COZxVZm9EhZ0hnakM_WBjEWcCsznfWeniw@mail.gmail.com
---
drivers/bus/mhi/host/pci_generic.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/bus/mhi/host/pci_generic.c
+++ b/drivers/bus/mhi/host/pci_generic.c
@@ -1139,7 +1139,8 @@ static int mhi_pci_get_irqs(struct mhi_c
*/
mhi_cntrl->nr_irqs = 1 + mhi_cntrl_config->num_events;
- nr_vectors = pci_alloc_irq_vectors(pdev, 1, mhi_cntrl->nr_irqs, PCI_IRQ_MSIX | PCI_IRQ_MSI);
+ nr_vectors = pci_alloc_irq_vectors(pdev, 1, roundup_pow_of_two(mhi_cntrl->nr_irqs),
+ PCI_IRQ_MSIX | PCI_IRQ_MSI);
if (nr_vectors < 0) {
dev_err(&pdev->dev, "Error allocating MSI vectors %d\n",
nr_vectors);