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drm/i915: get a permanent RPM reference on platforms w/o RPM support 

Currently we disable RPM functionality on platforms that doesn't support
this by not putting/getting the RPM reference we receive from the RPM
core during driver loading/unloading respectively. This is somewhat
obscure, so make it more explicit by keeping a reference dedicated for
this particular purpose whenever the driver is loaded. This makes it
possible to remove the HAS_RUNTIME_PM() special casing from every other
places in the next patch.

v2:
- fix intel_runtime_pm_get vs. intel_runtime_pm_put in
  intel_power_domains_fini()
v3:
- take only a low level RPM reference so the ref tracking asserts
  continue to work (Ville)
- update the commit message
- move the patch earlier for bisectability

Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1450352696-16135-1-git-send-email-imre.deak@intel.com
This commit is contained in:
Imre Deak 2015-12-17 13:44:56 +02:00
parent b268c699ac
commit 25b181b46e
1 changed files with 16 additions and 1 deletions
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17
drivers/gpu/drm/i915/intel_runtime_pm.c
View File

@ -1975,6 +1975,8 @@ int intel_power_domains_init(struct drm_i915_private *dev_priv)
*/
void intel_power_domains_fini(struct drm_i915_private *dev_priv)
{
struct device *device = &dev_priv->dev->pdev->dev;
/*
* The i915.ko module is still not prepared to be loaded when
* the power well is not enabled, so just enable it in case
@ -1989,6 +1991,13 @@ void intel_power_domains_fini(struct drm_i915_private *dev_priv)
/* Remove the refcount we took to keep power well support disabled. */
if (!i915.disable_power_well)
intel_display_power_put(dev_priv, POWER_DOMAIN_INIT);
/*
* Remove the refcount we took in intel_runtime_pm_enable() in case
* the platform doesn't support runtime PM.
*/
if (!HAS_RUNTIME_PM(dev_priv))
pm_runtime_put(device);
}
static void intel_power_domains_sync_hw(struct drm_i915_private *dev_priv)
@ -2303,8 +2312,14 @@ void intel_runtime_pm_enable(struct drm_i915_private *dev_priv)
struct drm_device *dev = dev_priv->dev;
struct device *device = &dev->pdev->dev;
/*
* Take a permanent reference to disable the RPM functionality and drop
* it only when unloading the driver. Use the low level get/put helpers,
* so the driver's own RPM reference tracking asserts also work on
* platforms without RPM support.
*/
if (!HAS_RUNTIME_PM(dev))
return;
pm_runtime_get_sync(device);
pm_runtime_set_autosuspend_delay(device, 10000); /* 10s */
pm_runtime_mark_last_busy(device);