[Intel-gfx] [PATCH v4 1/3] drm/i915: Disable/Enable PM Intrrupts based on the current freq.

[deepak.s at intel.com]

From: Deepak S <deepak.s at 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.

v2: Use bool variables (Daniel)

v3: Fix Interrupt masking bit (Deepak)

v4: Use existing symbolic constants in i915_reg.h (Daniel)

Signed-off-by: Deepak S <deepak.s at 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 f888fea..e89b9f4 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -943,6 +943,9 @@ struct intel_gen6_power_mgmt {
 	u8 rp0_delay;
 	u8 hw_max;
 
+	bool rp_up_masked;
+	bool 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 160d65d..d0d87ed 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -993,7 +993,20 @@ 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) |  GEN6_PM_RP_UP_THRESHOLD);
+			dev_priv->rps.rp_up_masked = true;
+			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) & ~GEN6_PM_RP_DOWN_THRESHOLD);
+			dev_priv->rps.rp_down_masked = false;
+		}
 
 		/*
 		 * For better performance, jump directly
@@ -1012,7 +1025,21 @@ 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.min_delay) {
+			I915_WRITE(GEN6_PMINTRMSK,
+					I915_READ(GEN6_PMINTRMSK) | GEN6_PM_RP_DOWN_THRESHOLD);
+			dev_priv->rps.rp_down_masked = true;
+			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) & ~GEN6_PM_RP_UP_THRESHOLD);
+			dev_priv->rps.rp_up_masked = false;
+		}
+
 	} 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 b9b4fe4..d00a2cf 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3613,6 +3613,9 @@ 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 = false;
+	dev_priv->rps.rp_down_masked = false;
+
 	valleyview_set_rps(dev_priv->dev, dev_priv->rps.rpe_delay);
 
 	gen6_enable_rps_interrupts(dev);
-- 
1.8.4.2