drm/i915: Scale ring, rather than ia, frequency on Haswell

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Haswell introduces a separate frequency domain for the ring (uncore). So
where we used to increase the CPU (IA) clock with GPU busyness, we now
need to scale the ring frequency directly instead. As the ring limits
our memory bandwidth, it is vital for performance that when the GPU is
busy, we increase the frequency of the ring to increase the available
memory bandwidth.

v2: Fix the algorithm to actually use the scaled gpu frequency for the ring.
v3: s/max_ring_freq/min_ring_freq/ as that is what it is

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
[danvet: Add space checkpatch complained about.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

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This commit is contained in:

Chris Wilson 2013-04-12 19:10:13 +01:00 • committed by Daniel Vetter

parent 3a3b4f984b

commit 3ebecd07d3

3 changed files with 38 additions and 16 deletions

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7

drivers/gpu/drm/i915/i915_debugfs.c

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4

drivers/gpu/drm/i915/i915_reg.h

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41

drivers/gpu/drm/i915/intel_pm.c

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