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How to disable MSI on PCI bus.

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Post time 2019-8-23 06:46:21 From the mobile phone | Show all posts |Read mode
Hi guys,

I am using a 802.11n atheros WiFi card. I need to disable MSI interrupts and enable legacy interrupt on PCI bus in order to use the card properly with ath9k driver. I had tried following methods:
- added quirks in kernel for the pci device.
- manually echoed the 0 in msi_bus file.
- cleared use_msi parameter in ath9k driver.

All of the method disable the msi. I could verify it in kernel message. After I disable MSI a dummy interrupt is assigned to the bus rather than a legacy interrupt. That is the problem.

I was not able to disable pci_msi bit in kernel configuration because it has unmet dependencies on rockchip_pci and gvicv3 interrupt controller.

I am using orangepi-rk3399 board. If anyone knows or faced similar issue please help me.
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