[Intel-gfx] [RFC 4/6] drm/i915: DRRS calls based on frontbuffer

[Vandana Kannan]

Calls to switch between high and low refresh rates based on calls made to
fb_invalidate and fb_flush.

Signed-off-by: Vandana Kannan <vandana.kannan at intel.com>
---
 drivers/gpu/drm/i915/intel_display.c |  5 ++++
 drivers/gpu/drm/i915/intel_dp.c      | 51 ++++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_drv.h     |  3 +++
 3 files changed, 59 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 6d6214a..3bf1732 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -9146,6 +9146,11 @@ static void intel_mark_fb_busy(struct drm_device *dev,
 		intel_increase_pllclock(dev, pipe);
 		if (ring && intel_fbc_enabled(dev))
 			ring->fbc_dirty = true;
+
+		if (ring)
+			intel_edp_drrs_invalidate(dev, frontbuffer_bits);
+		else
+			intel_edp_drrs_flush(dev, frontbuffer_bits);
 	}
 }
 
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index d50249e..bd0415b 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4949,6 +4949,57 @@ unlock:
 	mutex_unlock(&dev_priv->drrs.mutex);
 }
 
+void intel_edp_drrs_invalidate(struct drm_device *dev,
+			      unsigned frontbuffer_bits)
+{
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct drm_crtc *crtc;
+	enum pipe pipe;
+
+	mutex_lock(&dev_priv->drrs.mutex);
+	if (!dev_priv->drrs.dp) {
+		mutex_unlock(&dev_priv->drrs.mutex);
+		return;
+	}
+
+	crtc = dp_to_dig_port(dev_priv->drrs.dp)->base.base.crtc;
+	pipe = to_intel_crtc(crtc)->pipe;
+
+	if (dev_priv->drrs.refresh_rate_type == DRRS_LOW_RR)
+		intel_dp_set_drrs_state(dev_priv->dev,
+			dev_priv->drrs.dp->attached_connector->panel.
+			fixed_mode->vrefresh);
+
+	frontbuffer_bits &= INTEL_FRONTBUFFER_ALL_MASK(pipe);
+
+	dev_priv->drrs.busy_frontbuffer_bits |= frontbuffer_bits;
+	mutex_unlock(&dev_priv->drrs.mutex);
+}
+
+void intel_edp_drrs_flush(struct drm_device *dev,
+			 unsigned frontbuffer_bits)
+{
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct drm_crtc *crtc;
+	enum pipe pipe;
+
+	mutex_lock(&dev_priv->drrs.mutex);
+	if (!dev_priv->drrs.dp) {
+		mutex_unlock(&dev_priv->drrs.mutex);
+		return;
+	}
+
+	crtc = dp_to_dig_port(dev_priv->drrs.dp)->base.base.crtc;
+	pipe = to_intel_crtc(crtc)->pipe;
+	dev_priv->drrs.busy_frontbuffer_bits &= ~frontbuffer_bits;
+
+	if (dev_priv->drrs.refresh_rate_type != DRRS_LOW_RR &&
+		!dev_priv->psr.busy_frontbuffer_bits)
+			schedule_delayed_work(&dev_priv->drrs.work,
+				      msecs_to_jiffies(100));
+	mutex_unlock(&dev_priv->drrs.mutex);
+}
+
 static struct drm_display_mode *
 intel_dp_drrs_init(struct intel_connector *intel_connector,
 		   struct drm_display_mode *fixed_mode)
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index a728cc8..380bfe4 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -929,6 +929,9 @@ void intel_edp_psr_init(struct drm_device *dev);
 
 void intel_edp_drrs_enable(struct intel_dp *intel_dp);
 void intel_edp_drrs_disable(struct intel_dp *intel_dp);
+void intel_edp_drrs_invalidate(struct drm_device *dev,
+				unsigned frontbuffer_bits);
+void intel_edp_drrs_flush(struct drm_device *dev, unsigned frontbuffer_bits);
 
 int intel_dp_handle_hpd_irq(struct intel_digital_port *digport, bool long_hpd);
 void intel_dp_add_properties(struct intel_dp *intel_dp, struct drm_connector *connector);
-- 
2.0.1