System and method for providing universal serial bus link power management policies in a processor environment

1. An apparatus, comprising:

logic, at least a portion of which is in hardware, the logic configured to:

determine that a first device maintains a link to a platform in a selective suspend state;

assign a first latency value to the first device;

identify at least one user detectable artifact when a second device exits the selective suspend state; and

assign, to the second device, a second latency value that is different from the first value.

2. The apparatus of claim 1 , wherein the first latency value is approximately four hundred (400) microseconds (us).

3. The apparatus of claim 1 , wherein the second latency value is between approximately three (3) to five (5) milliseconds (ms).

4. The apparatus of claim 1 , wherein the first device is a digital camera, a secure digital card reader, or a television tuner.

5. The apparatus of claim 1 , wherein the second device is a human interface device.

6. The apparatus of claim 1 , wherein the apparatus is further configured to:

determine that when a third device exits the selective suspend state, the exit causes a buffer overrun or a buffer underrun.

7. The apparatus of claim 1 , wherein the first latency value is a Best Effort Service Latency (BESL) value indicative of an attempt to service the first device within a designated time interval.

8. The apparatus of claim 1 , wherein the first device includes a buffer and the latency value is dependent on a size of the buffer.

9. A system, comprising:

a device controller; and

a platform power management controller, wherein the system is configured for:

determining that a first device maintains a link in a selective suspend state;

assigning a first latency value to the first device;

identifying at least one user detectable artifact when a second device exits the selective suspend state; and

assigning, to the second device, a second latency value that is different from the first latency value.

10. The system of claim 9 , wherein the first latency value is approximately four hundred (400) microseconds (us).

11. The system of claim 9 , wherein the second latency value is between approximately three (3) to five (5) milliseconds (ms).

12. The system of claim 9 , wherein the first device is a digital camera, a secure digital card reader, or a television tuner.

13. The system of claim 9 , wherein the second device is a human interface device.

14. The system of claim 9 , wherein the system is further configured for:

determining that when a third device exits the selective suspend state, the exit causes a buffer overrun or a buffer underrun.

15. The system of claim 9 , wherein the first latency value is a Best Effort Service Latency (BESL) value indicative of an attempt to service the first device within a designated time interval.

16. The system of claim 9 , wherein the first device includes a buffer and the latency value is dependent on a size of the buffer.

17. A non-transitory computer readable medium comprising instructions that, when executed, cause an apparatus to:

determine that a first device maintains a link to a platform in a selective suspend state;

assign a first latency value to the first device;

identify at least one user detectable artifact when a second device exits the selective suspend state; and

assign, to the second device, a second latency value that is different from the first value.

18. The computer readable medium of claim 17 , wherein the first latency value is approximately four hundred (400) microseconds (us).

19. The computer readable medium of claim 17 , wherein the second latency value is between approximately three (3) to about five (5) milliseconds (ms).

20. The computer readable medium of claim 17 , wherein the first device is a digital camera, a secure digital card reader, or a television tuner.

21. The computer readable medium of claim 17 , wherein the second device is a human interface device.

22. The computer readable medium of claim 17 , wherein the apparatus is further configured to:

determine that when a third device exits the selective suspend state, the exit causes a buffer overrun or a buffer underrun.

23. The computer readable medium of claim 17 , wherein the first latency value is a Best Effort Service Latency (BESL) value indicative of an attempt to service the first device within a designated time interval.

24. The computer readable medium of claim 17 , wherein the first device includes a buffer and the latency value is dependent on a size of the buffer.

25. An apparatus, comprising:

a circuit configured for:

determining that a first device maintains a link to a platform in a selective suspend state;

assigning a first latency value to the first device;

identifying at least one user detectable artifact when a second device exits the selective suspend state; and

assigning, to the second device, a second latency value that is different from the first latency value.

26. The apparatus of claim 25 , wherein the circuit is further configured:

for determining that when a third device exits the selective suspend state, the exit causes a buffer overrun or a buffer underrun.

27. The apparatus of claim 25 , wherein the second latency value is between approximately three (3) to five (5) milliseconds (ms).

28. The apparatus of claim 25 , wherein the first device is a digital camera, a secure digital card reader, or a television tuner.

29. The apparatus of claim 25 , wherein the second device is a human interface device.

30. The apparatus of claim 25 , wherein the first latency value is a Best Effort Service Latency (BESL) value indicative of an attempt to service the first device within a designated time interval, and wherein the first device includes a buffer and the latency value is dependent on a size of the buffer.