[Nouveau] [Bug 37922] NV86: too high power usage.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=37922

--- Comment #24 from maximlevitsky at gmail.com 2011-08-27 19:39:31 PDT ---
1099/1588/1590 information as requested:


register 1098:

0x21ca0004 - default
0x21ca0034 - set by blob
0xf9fe007e - writeable bits
0x00000020 - enable automatic clock gating for register 0x1588
0x00000040 - enable automatic clock gating for register 0x1590


register 1588/1590:

* registers consists of 2bit subregisters (or 4bit subregisters maybe???):
0x00 - nothing
0x01 - automatic clock gating, doesn't affect engine usability 
        (tested on PGRAPH only). see register 0x1098

0x02 - nothing/reserved - tested this in all combinations
0x03 - disable clock - stops the engine - slightly larger power saving that
0x01, but difference small


1588 subregisters:
0x00000003 - PGRAPH - (or part of it).
0x00000030 - VPE - no power savings at all.

1590 subregisters:
0x00003000 - some VP2 engine
0x00000300 - some another VP2 engine
0x00000c00 - supposed to be also VP2 related - no reaction

also note that writing 0x8000 to this register while 1098 bit 0x40 set harms
power usage

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