Re: i2c: i801: Force no IRQ for Dell Latitude E7450

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Just became aware of this patch because Wolfram listed open i801 patches.

http://patchwork.ozlabs.org/project/linux-i2c/patch/20230514103634.235917-2-mail@xxxxxxxxxxxxx/

I understand that BIOS is broken and assigns an interrupt to the SMBUS PCI
host controller that is actually used by another device.

Dealing with internal low-level flag irq_managed in a device driver seems
to be fundamentally wrong. Also we may be in trouble if pirq_disable_irq()
should ever be called for the SMBUS host controller driver with
irq_managed being set and irq set to the one of the other device.

Not sure whether setting pci_dev->irq to 255 before calling pci_enable_device()
would help. As this isn't an i2c/smbus issue but a PCI/BIOS issue, maybe
the PCI folks have an idea what the least ugly quirk could be.

And to ask the obvious question: How about a BIOS update from DELL fixing
the broken interrupt assignment?



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