Messages in this thread | | | Subject | Re: [PATCH] ALSA: hda-intel - Disable MSI support by default | From | Roland Dreier <> | Date | Tue, 14 Nov 2006 20:30:36 -0800 |
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> That reminds me of a potential driver bug -- MSI-aware drivers need to > call pci_intx(pdev,0) to turn off the legacy PCI interrupt, before > enabling MSI interrupts.
Huh? The device can't generate any legacy interrupts once MSI is enabled. As the PCI spec says:
"While enabled for MSI or MSI-X operation, a function is prohibited from using its INTx# pin (if implemented) to request service (MSI, MSI-X, and INTx# are mutually exclusive)."
Although the MSI core does do pci_intx() for PCIe devices only, for some reason I can't grok.
> The only thing that has changed recently is that people are trying to > get it working on AMD/NV as well. (Brice Goglin's stuff starting at > 6397c75cbc4d7dbc3d07278b57c82a47dafb21b5 in 'git log')
Actually NVidia/AMD was working on some systems long before that -- I had it working at least 2 years ago.
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