[Intel-gfx] [PATCH 2/4] drm/i915: Set softmin frequency when going from idle to busy

[Michał Winiarski]

If the GPU load is low enough, it's possible that we'll be stuck at idle
frequency rather than transition into softmin frequency requested by
userspace.
Let's transition into softmin as soon as we're going from idle to busy.

References: https://bugs.freedesktop.org/show_bug.cgi?id=89728
Cc: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Imre Deak <imre.deak at intel.com>
Signed-off-by: Michał Winiarski <michal.winiarski at intel.com>
---
 drivers/gpu/drm/i915/intel_pm.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index adb6463..287a885 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4698,6 +4698,11 @@ void gen6_rps_busy(struct drm_i915_private *dev_priv)
 {
 	mutex_lock(&dev_priv->rps.hw_lock);
 	if (dev_priv->rps.enabled) {
+		if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
+			valleyview_set_rps(dev_priv, dev_priv->rps.min_freq_softlimit);
+		else
+			gen6_set_rps(dev_priv, dev_priv->rps.min_freq_softlimit);
+
 		if (dev_priv->pm_rps_events & (GEN6_PM_RP_DOWN_EI_EXPIRED | GEN6_PM_RP_UP_EI_EXPIRED))
 			gen6_rps_reset_ei(dev_priv);
 		I915_WRITE(GEN6_PMINTRMSK,
-- 
2.8.0