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drm/i915: Initialize DRRS delayed work

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Add DRRS work function to trigger a switch to low refresh rate,
when no activity is detected on screen till 1 sec duration.

v2: [By Ram]: drrs.dp also protected with drrs.mutex and worker function
is renamed to intel_edp_drrs_downclock_work [Chris]

Signed-off-by: Vandana Kannan <vandana.kannan@intel.com>
Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Vandana Kannan 2015-01-22 15:14:45 +05:30 committed by Daniel Vetter
parent b2c5c181ed
commit 4e9ac947c7
1 changed files with 31 additions and 9 deletions
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40
drivers/gpu/drm/i915/intel_dp.c
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@ -4817,20 +4817,40 @@ static void intel_dp_set_drrs_state(struct drm_device *dev, int refresh_rate)
I915_WRITE(reg, val);
}
/*
* 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.
*/
dev_priv->drrs.refresh_rate_type = index;
DRM_DEBUG_KMS("eDP Refresh Rate set to : %dHz\n", refresh_rate);
}
static void intel_edp_drrs_downclock_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;
mutex_lock(&dev_priv->drrs.mutex);
dev_priv->drrs.refresh_rate_type = index;
intel_dp = dev_priv->drrs.dp;
if (!intel_dp)
goto unlock;
/*
* The delayed work can race with an invalidate hence we need to
* recheck.
*/
if (dev_priv->drrs.busy_frontbuffer_bits)
goto unlock;
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);
unlock:
mutex_unlock(&dev_priv->drrs.mutex);
DRM_DEBUG_KMS("eDP Refresh Rate set to : %dHz\n", refresh_rate);
}
static struct drm_display_mode *
@ -4860,6 +4880,8 @@ intel_dp_drrs_init(struct intel_connector *intel_connector,
return NULL;
}
INIT_DELAYED_WORK(&dev_priv->drrs.work, intel_edp_drrs_downclock_work);
mutex_init(&dev_priv->drrs.mutex);
dev_priv->drrs.type = dev_priv->vbt.drrs_type;