[Intel-gfx] [PATCH] drm/i915: initialize ring frequency scaling table on SNB

[Chris Wilson]

On Thu, 23 Jun 2011 10:11:26 -0700, Jesse Barnes <jbarnes at virtuousgeek.org> wrote:
> I tested again and things were working as expected.  This patch adds a
> debugfs file for dumping the ring freq table, can you guys test it out
> (try disabling the call to update the table, dump it, make sure it's 0,
> then re-enable and make sure it's programmed correctly).

According to the debugfs, your defaults should be effective:

sandybridge:~$ cat /sys/kernel/debug/dri/1/i915_ring_freq_table 
GPU freq	Effective CPU freq
850		0 -> 1600
900		0 -> 1700
950		0 -> 1800
1000		0 -> 1800
1050		0 -> 1900
1100		0 -> 2000

I'll give the tyres another kick and see if I can spot any differences.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre