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this sets an upper limit on Link operational speed by restricting the values
advertised by the Upstream component in its training sequences. When ‘Auto’ is
selected HW initialized data will be used.
Clock Power Management
If supported by hardware and set to ‘Enabled’, the device is permitted to use
CLKREQ# signal for power management of Link clock in accordance to protocol
defined in appropriate form factor specification.
Compliance SOS
If supported by hardware and set to ‘Enabled’, this will force LTSSM to send SKP
Ordered Sets between sequences when sending Compliance Pattern or Modified
Compliance Pattern.
Hardware Autonomous Width
If supported by hardware and set to ‘Disabled’, this will disable the hardware’s
ability to change link width except width size reduction for the purpose of
correcting unstable link operation.
Hardware Autonomous Speed
If supported by hardware and set to ‘Disabled’, this will disable the hardware’s
ability to change link speed except speed rate reduction for the purpose of
correcting unstable link operation.
3.4.9 CSM Configuration