[PATCH 3/4] drm/i915: Disable/Enable PM Intrrupts based on the current freq.

[deepak.s@intel.com]

From: Deepak S <deepak.s@intel.com>

When current delay is already at max delay, Let's disable the PM UP
THRESHOLD INTRRUPTS, so that we will not get further interrupts until
current delay is less than max delay, Also request for the PM DOWN
THRESHOLD INTRRUPTS to indicate the decrease in clock freq. and
viceversa for PM DOWN THRESHOLD INTRRUPTS.

Signed-off-by: Deepak S <deepak.s@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h |  3 +++
 drivers/gpu/drm/i915/i915_irq.c | 31 +++++++++++++++++++++++++++++--
 drivers/gpu/drm/i915/intel_pm.c |  3 +++
 3 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index a62ac0c..d52a2db 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -915,6 +915,9 @@ struct intel_gen6_power_mgmt {
 	u8 rp0_delay;
 	u8 hw_max;
 
+	u8 rp_up_masked;
+	u8 rp_down_masked;
+
 	int last_adj;
 	enum { LOW_POWER, BETWEEN, HIGH_POWER } power;
 
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 4bde03a..cd82fdd 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -996,7 +996,20 @@ static void gen6_pm_rps_work(struct work_struct *work)
 			adj *= 2;
 		else
 			adj = 1;
-		new_delay = dev_priv->rps.cur_delay + adj;
+
+		if (dev_priv->rps.cur_delay >= dev_priv->rps.max_delay) {
+			I915_WRITE(GEN6_PMINTRMSK,
+					I915_READ(GEN6_PMINTRMSK) | 1 << 5);
+			dev_priv->rps.rp_up_masked = 1;
+			new_delay = dev_priv->rps.cur_delay;
+		} else
+			new_delay = dev_priv->rps.cur_delay + adj;
+
+		if (dev_priv->rps.rp_down_masked) {
+			I915_WRITE(GEN6_PMINTRMSK,
+					I915_READ(GEN6_PMINTRMSK) | ~(1 << 4));
+			dev_priv->rps.rp_down_masked = 0;
+		}
 
 		/*
 		 * For better performance, jump directly
@@ -1015,7 +1028,21 @@ static void gen6_pm_rps_work(struct work_struct *work)
 			adj *= 2;
 		else
 			adj = -1;
-		new_delay = dev_priv->rps.cur_delay + adj;
+
+		if (dev_priv->rps.cur_delay <= dev_priv->rps.max_delay) {
+			I915_WRITE(GEN6_PMINTRMSK,
+					I915_READ(GEN6_PMINTRMSK) | 1 << 4);
+			dev_priv->rps.rp_down_masked = 1;
+			new_delay = dev_priv->rps.cur_delay;
+		} else
+			new_delay = dev_priv->rps.cur_delay + adj;
+
+		if (dev_priv->rps.rp_up_masked) {
+			I915_WRITE(GEN6_PMINTRMSK,
+					I915_READ(GEN6_PMINTRMSK) | ~(1 << 5));
+			dev_priv->rps.rp_up_masked = 0;
+		}
+
 	} else { /* unknown event */
 		new_delay = dev_priv->rps.cur_delay;
 	}
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 716ca24..6b80ec4 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4186,6 +4186,9 @@ static void valleyview_enable_rps(struct drm_device *dev)
 			 vlv_gpu_freq(dev_priv, dev_priv->rps.rpe_delay),
 			 dev_priv->rps.rpe_delay);
 
+	dev_priv->rps.rp_up_masked = 0;
+	dev_priv->rps.rp_down_masked = 0;
+
 	valleyview_set_rps(dev_priv->dev, dev_priv->rps.rpe_delay);
 
 	gen6_enable_rps_interrupts(dev);
-- 
1.8.4.2