[PATCH 09/23] drm/i915/slpc: If using SLPC, do not set frequency

Sagar Arun Kamble sagar.a.kamble at intel.com
Mon Aug 22 04:46:15 UTC 2016

From: Tom O'Rourke <Tom.O'Rourke at intel.com>

When frequency requests are made by SLPC, host driver
should not attempt to make frequency requests due to
potential conflicts.

Host-based turbo operations are already avoided when
SLPC is used.  This change covers other frequency
requests such as from sysfs or debugfs interfaces.

A later patch in this series updates sysfs/debugfs
interfaces for setting max/min frequencies with SLPC.

v1: Use intel_slpc_active instead of HAS_SLPC (Paulo)

Signed-off-by: Tom O'Rourke <Tom.O'Rourke at intel.com>
Signed-off-by: Sagar Arun Kamble <sagar.a.kamble at intel.com>
 drivers/gpu/drm/i915/intel_pm.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 21dafe0..14c29b1 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4965,6 +4965,9 @@ void gen6_rps_boost(struct drm_i915_private *dev_priv,
 void intel_set_rps(struct drm_i915_private *dev_priv, u8 val)
+	if (intel_slpc_active(dev_priv))
+		return;
 	if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
 		valleyview_set_rps(dev_priv, val);

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