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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #9 from maximlevitsky at gmail.com 2011-07-29 07:07:35 PDT ---
So thats it, I reduced and more or less understood the involved register
writes, the end result is about 0.150W higher wattage that blob and this trace:


# enable everything in PMC.ENABLE - VPE bit decreases power usage dramaticly
[0] 1226.455757 MMIO32 W 0x000200 0xffffffff PMC.ENABLE <= everything

# some power magic
[0] 1226.458120 MMIO32 W 0x001098 0x21ca003c PBUS+0x98 <= 0x21ca003c
[0] 1226.458192 MMIO32 W 0x001604 0x00020804 PBUS+0x604 <= 0x20804
[0] 1226.458299 MMIO32 W 0x001588 0x00000001 PBUS+0x588 <= 0x1

#disable VC2 xtensa clock
[0] 1226.471062 MMIO32 W 0x00c040 0x2ee01233 0xc040 <= 0x2ee01233

# disable secondary DAC 
[0] 1226.425262 MMIO32 W 0x61a010 0x80000002 PDISPLAY.DAC_REGS[0].CLK_CTRL1 <=
{ CONNECTED = 0 | 0x80000002 }
[0] 1226.425394 MMIO32 W 0x61a004 0xd0150000 PDISPLAY.DAC_REGS[0].DPMS_CTRL <=
{ PENDING | 0x50150000 }
[0] 1226.425610 MMIO32 W 0x61a810 0x00000003 PDISPLAY.DAC_REGS[0x1].CLK_CTRL1
<= { CONNECTED = 0 | 0x3 }
[0] 1226.425717 MMIO32 W 0x61a804 0xd0150000 PDISPLAY.DAC_REGS[0x1].DPMS_CTRL
<= { PENDING | 0x50150000 }

#PFB magic - some dram optimization ???
[0] 1226.423318 MMIO32 W 0x100000 0x0000c042 PFB+0 <= 0xc042
[0] 1226.423388 MMIO32 W 0x100004 0x0000c042 PFB+0x4 <= 0xc042
[0] 1226.423457 MMIO32 W 0x100008 0x0000c042 PFB+0x8 <= 0xc042
[0] 1226.423527 MMIO32 W 0x100b78 0x0000c042 PFB+0xb78 <= 0xc042
[0] 1226.423596 MMIO32 W 0x100c0c 0x0000c042 PFB+0xc0c <= 0xc042
[0] 1226.423735 MMIO32 W 0x100d04 0x0000c042 PFB+0xd04 <= 0xc042
[0] 1226.423804 MMIO32 W 0x100e0c 0x0000c042 PFB+0xe0c <= 0xc042

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