about mpss with pcie_bus_perf

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looks like we have some problem with MPSS.

+-02.2-[10-1f]----00.0-[11-13]--+-02.0-[12]--+-00.0
                           |                      |                   \-00.1
                           |                      \-03.0-[13]----00.0

kernel boot with pce_bus_perf:
00:02.2: cap/ctl: 256/256
10:00.0: cap/ctl: 256/256
11:02.0: cap/ctl: 256/256
12:00.0: cap/ctl: 128/128
12:00.1: cap/ctl: 128/128

11:03.0: cap/ctl: 256/256
13:00.0: cap/ctl: 256/256

Should we set MPSS to 128?

Thanks

Yinghai
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