[PATCH 0/2] i2c: i801: Force no IRQ for Dell Latitude E7450

Marius Hoch
2023-05-14T10:37:20Z

The Dell Latitude E7450 uses IRQ 18 for the accelerometer,
but also claims that the SMBus uses IRQ 18. This will
result in:

i801_smbus 0000:00:1f.3: PCI INT C: failed to register GSI
i801_smbus 0000:00:1f.3: Failed to enable SMBus PCI device (-16)
i801_smbus: probe of 0000:00:1f.3 failed with error -16

Force the SMBus IRQ to IRQ_NOTCONNECTED in this case, so that
we fall back to polling, which also seems to be what the (very
dated) Windows 7 drivers on the Dell Latitude E7450 do.

This was tested on Dell Latitude E7450.

I chose to explicitly list all affected devices here, but
alternatively it would be possible to do this programmatically:
If the initial pcim_enable_device fails and we're on (any)
Dell Latitude, re-try with IRQ_NOTCONNECTED.

Marius Hoch (2):
i2c: i801: Force no IRQ for Dell Latitude E7450
i2c: i801: Force no IRQ for further Dell Latitudes

drivers/i2c/busses/i2c-i801.c | 34 ++++++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)

base-commit: cc3c44c9fda264c6d401be04e95449a57c1231c6
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2.40.1