[PATCH 2/7] drm/i915: Initialize DRRS delayed work

Vandana Kannan
2014-12-18T15:15:29Z

Add DRRS work function to trigger a switch to low refresh rate when activity
is detected on screen.

Signed-off-by: Vandana Kannan <vandana.kannan@intel.com>
---
drivers/gpu/drm/i915/intel_dp.c | 36 ++++++++++++++++++++++++++++--------
1 file changed, 28 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 96d8e17..ef8b55d 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4814,20 +4814,38 @@ static void intel_dp_set_drrs_state(struct drm_device *dev, int refresh_rate)
I915_WRITE(reg, val);
}

+ dev_priv->drrs.refresh_rate_type = index;
+
+ DRM_DEBUG_KMS("eDP Refresh Rate set to : %dHz\n", refresh_rate);
+}
+
+static void intel_edp_drrs_work(struct work_struct *work)
+{
+ struct drm_i915_private *dev_priv =
+ container_of(work, typeof(*dev_priv), drrs.work.work);
+ struct intel_dp *intel_dp = dev_priv->drrs.dp;
+
+ mutex_lock(&dev_priv->drrs.mutex);
+
+ if (!intel_dp)
+ goto unlock;
+
/*
- * mutex taken to ensure that there is no race between differnt
- * drrs calls trying to update refresh rate. This scenario may occur
- * in future when idleness detection based DRRS in kernel and
- * possible calls from user space to set differnt RR are made.
+ * The delayed work can race with an invalidate hence we need to
+ * recheck.
*/

- mutex_lock(&dev_priv->drrs.mutex);
+ if (dev_priv->drrs.busy_frontbuffer_bits)
+ goto unlock;

- dev_priv->drrs.refresh_rate_type = index;
+ if (dev_priv->drrs.refresh_rate_type != DRRS_LOW_RR)
+ intel_dp_set_drrs_state(dev_priv->dev,
+ intel_dp->attached_connector->panel.
+ downclock_mode->vrefresh);

- mutex_unlock(&dev_priv->drrs.mutex);
+unlock:

- DRM_DEBUG_KMS("eDP Refresh Rate set to : %dHz\n", refresh_rate);
+ mutex_unlock(&dev_priv->drrs.mutex);
}

static struct drm_display_mode *
@@ -4857,6 +4875,8 @@ intel_dp_drrs_init(struct intel_connector *intel_connector,
return NULL;
}

+ INIT_DELAYED_WORK(&dev_priv->drrs.work, intel_edp_drrs_work);
+
mutex_init(&dev_priv->drrs.mutex);

dev_priv->drrs.type = dev_priv->vbt.drrs_type;