I have replied with my Tested-by to the patch at [2], which has landed
in the linux-next as the commit 20f1bfb8dd62 ("PCI: qcom:
Add support for handling MSIs from 8 endpoints"). However lately I
noticed that during the tests I still had 'pcie_pme=nomsi', so the
device was not forced to use higher MSI vectors.
After removing this option I noticed that high MSI vectors are not
delivered on tested platforms. Additional research pointed to
a patch in msm-4.14 ([1]), which describes that each group of MSI
vectors is mapped to the separate interrupt.
Without these changes specifying num_vectors can lead to missing MSI
interrupts and thus to devices malfunction.
[1] https://git.codelinaro.org/clo/la/kernel/msm-4.14/-/commit/671a3d5f129f4bfe477152292ada2194c8440d22
[2] https://lore.kernel.org/linux-arm-msm/20211214101319.25258-1-manivannan.sadhasivam@xxxxxxxxxx/
Fixes: 20f1bfb8dd62 ("PCI: qcom: Add support for handling MSIs from 8 endpoints")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
---
drivers/pci/controller/dwc/pcie-qcom.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 8523b5ef9d16..2ea13750b492 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -1592,7 +1592,6 @@ static int qcom_pcie_probe(struct platform_device *pdev)
pci->dev = dev;
pci->ops = &dw_pcie_ops;
pp = &pci->pp;
- pp->num_vectors = MAX_MSI_IRQS;
pcie->pci = pci;
--
2.35.1
