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drm/i915: Remove unrequired POSTING_READ from gen6_set_rps()

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The uncached mmio is sufficient to queue the mmio writes without raising
forcewake. The forced flush along with acquiring forcewake from the
posting read is not required for adjusting the RPS frequency.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/20170220094713.22874-3-chris@chris-wilson.co.uk
Reviewed-by: Radoslaw Szwichtenberg <radoslaw.szwichtenberg@intel.com>
This commit is contained in:
Chris Wilson 2017-02-20 09:47:09 +00:00
parent 76e4e4b532
commit e18b9431e4
1 changed files with 0 additions and 2 deletions
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2
drivers/gpu/drm/i915/intel_pm.c
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@ -4939,8 +4939,6 @@ static int gen6_set_rps(struct drm_i915_private *dev_priv, u8 val)
I915_WRITE(GEN6_RP_INTERRUPT_LIMITS, intel_rps_limits(dev_priv, val));
I915_WRITE(GEN6_PMINTRMSK, gen6_rps_pm_mask(dev_priv, val));
POSTING_READ(GEN6_RPNSWREQ);
dev_priv->rps.cur_freq = val;
trace_intel_gpu_freq_change(intel_gpu_freq(dev_priv, val));