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drm/i915: get a runtime PM ref for the deferred GT powersave enabling

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At least on VLV but probably on other platforms too we depend on RC6
being enabled for RPM, so disable RPM until the delayed RC6 enabling
completes.

v2:
- explain the reason for the _noresume version of RPM get (Daniel)
- use the simpler 'if (schedule_work()) rpm_get();' instead of
  'if (!cancel_work_sync()) rpm_get(); schedule_work();'

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Imre Deak 2014-04-14 20:24:29 +03:00 committed by Daniel Vetter
parent dc1d0136a4
commit c6df39b5ea
3 changed files with 38 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/gpu/drm/i915/i915_drv.c
View File

@ -782,7 +782,7 @@ int i915_reset(struct drm_device *dev)
* previous concerns that it doesn't respond well to some forms
* of re-init after reset. */
if (INTEL_INFO(dev)->gen > 5)
intel_enable_gt_powersave(dev);
intel_reset_gt_powersave(dev);
intel_hpd_init(dev);
} else {
@ -951,6 +951,9 @@ static int intel_runtime_suspend(struct device *device)
struct drm_device *dev = pci_get_drvdata(pdev);
struct drm_i915_private *dev_priv = dev->dev_private;
if (WARN_ON_ONCE(!dev_priv->rps.enabled))
return -ENODEV;
WARN_ON(!HAS_RUNTIME_PM(dev));
assert_force_wake_inactive(dev_priv);

2
drivers/gpu/drm/i915/intel_drv.h
View File

@ -925,6 +925,7 @@ void intel_init_gt_powersave(struct drm_device *dev);
void intel_cleanup_gt_powersave(struct drm_device *dev);
void intel_enable_gt_powersave(struct drm_device *dev);
void intel_disable_gt_powersave(struct drm_device *dev);
void intel_reset_gt_powersave(struct drm_device *dev);
void ironlake_teardown_rc6(struct drm_device *dev);
void gen6_update_ring_freq(struct drm_device *dev);
void gen6_rps_idle(struct drm_i915_private *dev_priv);
@ -932,6 +933,7 @@ void gen6_rps_boost(struct drm_i915_private *dev_priv);
void intel_aux_display_runtime_get(struct drm_i915_private *dev_priv);
void intel_aux_display_runtime_put(struct drm_i915_private *dev_priv);
void intel_runtime_pm_get(struct drm_i915_private *dev_priv);
void intel_runtime_pm_get_noresume(struct drm_i915_private *dev_priv);
void intel_runtime_pm_put(struct drm_i915_private *dev_priv);
void intel_init_runtime_pm(struct drm_i915_private *dev_priv);
void intel_fini_runtime_pm(struct drm_i915_private *dev_priv);

34
drivers/gpu/drm/i915/intel_pm.c
View File

@ -4549,6 +4549,8 @@ static void intel_gen6_powersave_work(struct work_struct *work)
}
dev_priv->rps.enabled = true;
mutex_unlock(&dev_priv->rps.hw_lock);
intel_runtime_pm_put(dev_priv);
}
void intel_enable_gt_powersave(struct drm_device *dev)
@ -4566,12 +4568,28 @@ void intel_enable_gt_powersave(struct drm_device *dev)
* PCU communication is slow and this doesn't need to be
* done at any specific time, so do this out of our fast path
* to make resume and init faster.
*
* We depend on the HW RC6 power context save/restore
* mechanism when entering D3 through runtime PM suspend. So
* disable RPM until RPS/RC6 is properly setup. We can only
* get here via the driver load/system resume/runtime resume
* paths, so the _noresume version is enough (and in case of
* runtime resume it's necessary).
*/
schedule_delayed_work(&dev_priv->rps.delayed_resume_work,
round_jiffies_up_relative(HZ));
if (schedule_delayed_work(&dev_priv->rps.delayed_resume_work,
round_jiffies_up_relative(HZ)))
intel_runtime_pm_get_noresume(dev_priv);
}
}
void intel_reset_gt_powersave(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
dev_priv->rps.enabled = false;
intel_enable_gt_powersave(dev);
}
static void ibx_init_clock_gating(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
@ -6025,6 +6043,18 @@ void intel_runtime_pm_get(struct drm_i915_private *dev_priv)
WARN(dev_priv->pm.suspended, "Device still suspended.\n");
}
void intel_runtime_pm_get_noresume(struct drm_i915_private *dev_priv)
{
struct drm_device *dev = dev_priv->dev;
struct device *device = &dev->pdev->dev;
if (!HAS_RUNTIME_PM(dev))
return;
WARN(dev_priv->pm.suspended, "Getting nosync-ref while suspended.\n");
pm_runtime_get_noresume(device);
}
void intel_runtime_pm_put(struct drm_i915_private *dev_priv)
{
struct drm_device *dev = dev_priv->dev;