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@xxxxxxxxxxxxxxx>
Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_runtime_pm.c | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index fc7cf2c..bf2492f 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -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);
--
2.5.0
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