MosChip PCIe serial port adapter is disabled and stops working some time after boot
Issue
lspci -vv while working:
02:00.0 Serial controller: MosChip Semiconductor Technology Ltd. 4-Port PCIe Serial Adapter (prog-if 02 [16550])
Subsystem: Device a000:1000
Flags: bus master, fast devsel, latency 0, IRQ 19
I/O ports at e030 [size=8]
Memory at f7c07000 (32-bit, non-prefetchable) [size=4K]
Memory at f7c06000 (32-bit, non-prefetchable) [size=4K]
Capabilities: [50] MSI: Enable- Count=1/8 Maskable- 64bit+
Capabilities: [78] Power Management version 3
Capabilities: [80] Express Legacy Endpoint, MSI 00
Capabilities: [100] Virtual Channel
Capabilities: [800] Advanced Error Reporting
Kernel driver in use: serial
and after it stops working:
02:00.0 Serial controller: MosChip Semiconductor Technology Ltd. 4-Port PCIe Serial Adapter (prog-if 02 [16550])
Subsystem: Device a000:1000
Flags: fast devsel, IRQ 19
I/O ports at e030 [disabled] [size=8]
[virtual] Memory at f7c07000 (32-bit, non-prefetchable) [size=4K]
[virtual] Memory at f7c06000 (32-bit, non-prefetchable) [size=4K]
Capabilities: [50] MSI: Enable- Count=1/8 Maskable- 64bit+
Capabilities: [78] Power Management version 3
Capabilities: [80] Express Legacy Endpoint, MSI 00
Capabilities: [100] Virtual Channel
Capabilities: [800] Advanced Error Reporting
Kernel driver in use: serial
Environment
Red Hat Enterprise Linux 7
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