From e18b9431e46ac0deada6694e047cf80c043a26c0 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Mon, 20 Feb 2017 09:47:09 +0000 Subject: [PATCH] drm/i915: Remove unrequired POSTING_READ from gen6_set_rps() 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 Link: http://patchwork.freedesktop.org/patch/msgid/20170220094713.22874-3-chris@chris-wilson.co.uk Reviewed-by: Radoslaw Szwichtenberg --- drivers/gpu/drm/i915/intel_pm.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index af11c4090c07..169c4908ad5b 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -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)); -- 2.20.1