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The second PCIe link is only used to improve performance on older generation
PCIe devices (e.g. MT7621) where the bus speed of one link is not enough to
saturate both wifi bands under really good conditions.
Unfortunately it seems that resetting the hardware after a firmware error
causes the second band to stop working if the second link is in use.
Disable the link until the issue is properly fixed.
For testing, the link can still be enabled via module parameter.
Fixes: 9093cfff72e3 ("mt76: mt7915: add support for using a secondary PCIe link for gen1")
Signed-off-by: Felix Fietkau <[email protected]>