[Intel-gfx] [PATCH 2/3] drm/i915: RC6 Fix Write Min Frequency Table.

[Chris Wilson]

On Tue, Apr 09, 2013 at 06:32:45PM -0300, Rodrigo Vivi wrote:
> According to SNB GT PM Programming Guide page 9,
> Write Min Frequency Table is 09h

I think this is the winner of what workarounds the hang...
(Since patch 3 is a no-op, patch 1 still reverts a change to the media
turbo mode requested by VPG.)

The original code for this patch is correct, I have in the bspec:

0x8 WRITE_MIN_FREQ_TABLE
0x9 READ_MIN_FREQ_TABLE

So the effect of this patch is to undo the ring/uncore scaling with GPU
frequency which will slow everything down and is less likely to provoke
uncore death.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre