[PATCH] drm/i915: Remove unrequired POSTING_READ from gen6_set_rps()

[PATCH] drm/i915: Remove unrequired POSTING_READ from gen6_set_rps()

[Chris Wilson]

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>
---
 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 bde7ef3c643e..4e9488bd9c3c 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4944,8 +4944,6 @@ 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));
 
-- 
2.11.0

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✗ Fi.CI.BAT: warning for drm/i915: Remove unrequired POSTING_READ from gen6_set_rps()

[Patchwork]

== Series Details ==

Series: drm/i915: Remove unrequired POSTING_READ from gen6_set_rps()
URL   : https://patchwork.freedesktop.org/series/19822/
State : warning

== Summary ==

Series 19822v1 drm/i915: Remove unrequired POSTING_READ from gen6_set_rps()
https://patchwork.freedesktop.org/api/1.0/series/19822/revisions/1/mbox/

Test kms_force_connector_basic:
        Subgroup prune-stale-modes:
                pass       -> SKIP       (fi-snb-2600)

fi-bdw-5557u     total:252  pass:241  dwarn:0   dfail:0   fail:0   skip:11 
fi-bsw-n3050     total:252  pass:213  dwarn:0   dfail:0   fail:0   skip:39 
fi-bxt-j4205     total:252  pass:233  dwarn:0   dfail:0   fail:0   skip:19 
fi-bxt-t5700     total:83   pass:70   dwarn:0   dfail:0   fail:0   skip:12 
fi-byt-j1900     total:252  pass:225  dwarn:0   dfail:0   fail:0   skip:27 
fi-byt-n2820     total:252  pass:221  dwarn:0   dfail:0   fail:0   skip:31 
fi-hsw-4770      total:252  pass:236  dwarn:0   dfail:0   fail:0   skip:16 
fi-hsw-4770r     total:252  pass:236  dwarn:0   dfail:0   fail:0   skip:16 
fi-ilk-650       total:252  pass:202  dwarn:0   dfail:0   fail:0   skip:50 
fi-ivb-3520m     total:252  pass:234  dwarn:0   dfail:0   fail:0   skip:18 
fi-ivb-3770      total:252  pass:234  dwarn:0   dfail:0   fail:0   skip:18 
fi-kbl-7500u     total:252  pass:234  dwarn:0   dfail:0   fail:0   skip:18 
fi-skl-6260u     total:252  pass:242  dwarn:0   dfail:0   fail:0   skip:10 
fi-skl-6700hq    total:252  pass:235  dwarn:0   dfail:0   fail:0   skip:17 
fi-skl-6700k     total:252  pass:230  dwarn:4   dfail:0   fail:0   skip:18 
fi-skl-6770hq    total:252  pass:242  dwarn:0   dfail:0   fail:0   skip:10 
fi-snb-2520m     total:252  pass:224  dwarn:0   dfail:0   fail:0   skip:28 
fi-snb-2600      total:252  pass:222  dwarn:0   dfail:0   fail:0   skip:30 

c2033e7aa383d062000e024c5fac5f46560327cd drm-tip: 2017y-02m-16d-20h-42m-04s UTC integration manifest
198a9ee drm/i915: Remove unrequired POSTING_READ from gen6_set_rps()

== Logs ==

For more details see: https://intel-gfx-ci.01.org/CI/Patchwork_3871/
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Re: [PATCH] drm/i915: Remove unrequired POSTING_READ from gen6_set_rps()

[Szwichtenberg, Radoslaw]

On Fri, 2017-02-17 at 08:31 +0000, Chris Wilson wrote:
> 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>
Reviewed-by: Radoslaw Szwichtenberg <radoslaw.szwichtenberg@intel.com>
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