[Bug 75244] [BYT Regression]igt/gem_concurrent_blit/gtt-gpu-read-after-write-forked causes *ERROR* timed out waiting for Punit

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75244

--- Comment #19 from Deepak S <deepak.s at intel.com> ---
Since disabling RC6 is helping us. Shall we try doing a forcewake before
request the freq? If this does not help we might need help from HW team. 


diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 0115689..1fea122 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3254,18 +3254,18 @@ static void vlv_set_rps_idle(struct drm_i915_private
*dev_priv)
        /* Mask turbo interrupt so that they will not come in between */
        I915_WRITE(GEN6_PMINTRMSK, 0xffffffff);

-       vlv_force_gfx_clock(dev_priv, true);
-
        dev_priv->rps.cur_freq = dev_priv->rps.min_freq_softlimit;

+       gen6_gt_force_wake_get(dev_priv, FORCEWAKE_ALL);
+
        vlv_punit_write(dev_priv, PUNIT_REG_GPU_FREQ_REQ,
                                        dev_priv->rps.min_freq_softlimit);

        if (wait_for(((vlv_punit_read(dev_priv, PUNIT_REG_GPU_FREQ_STS))
-                               & GENFREQSTATUS) == 0, 5))
+                               & GENFREQSTATUS) == 0, 10))
                DRM_ERROR("timed out waiting for Punit\n");

-       vlv_force_gfx_clock(dev_priv, false);
+       gen6_gt_force_wake_put(dev_priv, FORCEWAKE_ALL);

        I915_WRITE(GEN6_PMINTRMSK,
                   gen6_rps_pm_mask(dev_priv, dev_priv->rps.cur_freq));

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