The device global init_power_on flag is somewhat arbitrary and makes
debugging power refcounting problems difficult. Instead arrange things
so that all display power domain get has a corresponding put call. After
this change we have the following sequences:
driver loading:
intel_power_domains_init_hw();
<other init steps>
intel_power_domains_enable();
driver unloading:
intel_power_domains_disable();
<other uninit steps>
intel_power_domains_fini_hw();
system suspend:
intel_power_domains_disable();
<other suspend steps>
intel_power_domains_suspend();
system resume:
intel_power_domains_resume();
<other resume steps>
intel_power_domains_enable();
at other times while the driver is loaded:
intel_display_power_get();
...
intel_display_power_put();
Suggested-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.c | 65 +++++++---------
drivers/gpu/drm/i915/i915_drv.h | 2 +-
drivers/gpu/drm/i915/intel_display.c | 5 +-
drivers/gpu/drm/i915/intel_drv.h | 15 +++-
drivers/gpu/drm/i915/intel_runtime_pm.c | 133 +++++++++++++++++++++++---------
5 files changed, 142 insertions(+), 78 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 021304e252eb..35a012ffc03b 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1282,6 +1282,7 @@ static void i915_driver_register(struct drm_i915_private *dev_priv)
if (INTEL_INFO(dev_priv)->num_pipes)
drm_kms_helper_poll_init(dev);
+ intel_power_domains_enable(dev_priv);
intel_runtime_pm_enable(dev_priv);
}
@@ -1292,6 +1293,7 @@ static void i915_driver_register(struct drm_i915_private *dev_priv)
static void i915_driver_unregister(struct drm_i915_private *dev_priv)
{
intel_runtime_pm_disable(dev_priv);
+ intel_power_domains_disable(dev_priv);
intel_fbdev_unregister(dev_priv);
intel_audio_deinit(dev_priv);
@@ -1374,7 +1376,7 @@ int i915_driver_load(struct pci_dev *pdev, const struct pci_device_id *ent)
if (ret < 0)
goto out_pci_disable;
- intel_runtime_pm_get(dev_priv);
+ disable_rpm_wakeref_asserts(dev_priv);
ret = i915_driver_init_mmio(dev_priv);
if (ret < 0)
@@ -1404,7 +1406,7 @@ int i915_driver_load(struct pci_dev *pdev, const struct pci_device_id *ent)
intel_init_ipc(dev_priv);
- intel_runtime_pm_put(dev_priv);
+ enable_rpm_wakeref_asserts(dev_priv);
i915_welcome_messages(dev_priv);
@@ -1415,7 +1417,7 @@ int i915_driver_load(struct pci_dev *pdev, const struct pci_device_id *ent)
out_cleanup_mmio:
i915_driver_cleanup_mmio(dev_priv);
out_runtime_pm_put:
- intel_runtime_pm_put(dev_priv);
+ enable_rpm_wakeref_asserts(dev_priv);
i915_driver_cleanup_early(dev_priv);
out_pci_disable:
pci_disable_device(pdev);
@@ -1433,7 +1435,7 @@ void i915_driver_unload(struct drm_device *dev)
struct drm_i915_private *dev_priv = to_i915(dev);
struct pci_dev *pdev = dev_priv->drm.pdev;
- intel_display_power_get(dev_priv, POWER_DOMAIN_INIT);
+ disable_rpm_wakeref_asserts(dev_priv);
i915_driver_unregister(dev_priv);
@@ -1465,7 +1467,8 @@ void i915_driver_unload(struct drm_device *dev)
i915_driver_cleanup_hw(dev_priv);
i915_driver_cleanup_mmio(dev_priv);
- intel_display_power_put(dev_priv, POWER_DOMAIN_INIT);
+ enable_rpm_wakeref_asserts(dev_priv);
+
WARN_ON(atomic_read(&dev_priv->runtime_pm.wakeref_count));
}
@@ -1575,7 +1578,7 @@ static int i915_drm_suspend(struct drm_device *dev)
/* We do a lot of poking in a lot of registers, make sure they work
* properly. */
- intel_display_set_init_power(dev_priv, true);
+ intel_power_domains_disable(dev_priv);
drm_kms_helper_poll_disable(dev);
@@ -1612,6 +1615,18 @@ static int i915_drm_suspend(struct drm_device *dev)
return 0;
}
+static enum i915_drm_suspend_mode
+get_suspend_mode(struct drm_i915_private *dev_priv, bool hibernate)
+{
+ if (hibernate)
+ return I915_DRM_SUSPEND_HIBERNATE;
+
+ if (suspend_to_idle(dev_priv))
+ return I915_DRM_SUSPEND_IDLE;
+
+ return I915_DRM_SUSPEND_MEM;
+}
+
static int i915_drm_suspend_late(struct drm_device *dev, bool hibernation)
{
struct drm_i915_private *dev_priv = to_i915(dev);
@@ -1622,21 +1637,10 @@ static int i915_drm_suspend_late(struct drm_device *dev, bool hibernation)
i915_gem_suspend_late(dev_priv);
- intel_display_set_init_power(dev_priv, false);
intel_uncore_suspend(dev_priv);
- /*
- * In case of firmware assisted context save/restore don't manually
- * deinit the power domains. This also means the CSR/DMC firmware will
- * stay active, it will power down any HW resources as required and
- * also enable deeper system power states that would be blocked if the
- * firmware was inactive.
- */
- if (IS_GEN9_LP(dev_priv) || hibernation || !suspend_to_idle(dev_priv) ||
- dev_priv->csr.dmc_payload == NULL) {
- intel_power_domains_suspend(dev_priv);
- dev_priv->power_domains_suspended = true;
- }
+ intel_power_domains_suspend(dev_priv,
+ get_suspend_mode(dev_priv, hibernation));
ret = 0;
if (IS_GEN9_LP(dev_priv))
@@ -1648,10 +1652,7 @@ static int i915_drm_suspend_late(struct drm_device *dev, bool hibernation)
if (ret) {
DRM_ERROR("Suspend complete failed: %d\n", ret);
- if (dev_priv->power_domains_suspended) {
- intel_power_domains_init_hw(dev_priv, true);
- dev_priv->power_domains_suspended = false;
- }
+ intel_power_domains_resume(dev_priv);
goto out;
}
@@ -1768,6 +1769,8 @@ static int i915_drm_resume(struct drm_device *dev)
intel_opregion_notify_adapter(dev_priv, PCI_D0);
+ intel_power_domains_enable(dev_priv);
+
enable_rpm_wakeref_asserts(dev_priv);
return 0;
@@ -1802,7 +1805,7 @@ static int i915_drm_resume_early(struct drm_device *dev)
ret = pci_set_power_state(pdev, PCI_D0);
if (ret) {
DRM_ERROR("failed to set PCI D0 power state (%d)\n", ret);
- goto out;
+ return ret;
}
/*
@@ -1818,10 +1821,8 @@ static int i915_drm_resume_early(struct drm_device *dev)
* depend on the device enable refcount we can't anyway depend on them
* disabling/enabling the device.
*/
- if (pci_enable_device(pdev)) {
- ret = -EIO;
- goto out;
- }
+ if (pci_enable_device(pdev))
+ return -EIO;
pci_set_master(pdev);
@@ -1844,18 +1845,12 @@ static int i915_drm_resume_early(struct drm_device *dev)
intel_uncore_sanitize(dev_priv);
- if (dev_priv->power_domains_suspended)
- intel_power_domains_init_hw(dev_priv, true);
- else
- intel_display_set_init_power(dev_priv, true);
+ intel_power_domains_resume(dev_priv);
intel_engines_sanitize(dev_priv);
enable_rpm_wakeref_asserts(dev_priv);
-out:
- dev_priv->power_domains_suspended = false;
-
return ret;
}
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 5fa13887b911..74482753a04e 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -935,8 +935,8 @@ struct i915_power_domains {
* Power wells needed for initialization at driver init and suspend
* time are on. They are kept on until after the first modeset.
*/
- bool init_power_on;
bool initializing;
+ bool display_core_suspended;
int power_well_count;
struct mutex lock;
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 690e1e816e77..09d62b0c62cb 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -15848,6 +15848,8 @@ intel_modeset_setup_hw_state(struct drm_device *dev,
struct intel_encoder *encoder;
int i;
+ intel_display_power_get(dev_priv, POWER_DOMAIN_INIT);
+
intel_early_display_was(dev_priv);
intel_modeset_readout_hw_state(dev);
@@ -15902,7 +15904,8 @@ intel_modeset_setup_hw_state(struct drm_device *dev,
if (WARN_ON(put_domains))
modeset_put_power_domains(dev_priv, put_domains);
}
- intel_display_set_init_power(dev_priv, false);
+
+ intel_display_power_put(dev_priv, POWER_DOMAIN_INIT);
intel_power_domains_verify_state(dev_priv);
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 3f012716f2dc..d0402051925b 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1954,7 +1954,18 @@ int intel_power_domains_init(struct drm_i915_private *);
void intel_power_domains_cleanup(struct drm_i915_private *dev_priv);
void intel_power_domains_init_hw(struct drm_i915_private *dev_priv, bool resume);
void intel_power_domains_fini_hw(struct drm_i915_private *dev_priv);
-void intel_power_domains_suspend(struct drm_i915_private *dev_priv);
+void intel_power_domains_enable(struct drm_i915_private *dev_priv);
+void intel_power_domains_disable(struct drm_i915_private *dev_priv);
+
+enum i915_drm_suspend_mode {
+ I915_DRM_SUSPEND_IDLE,
+ I915_DRM_SUSPEND_MEM,
+ I915_DRM_SUSPEND_HIBERNATE,
+};
+
+void intel_power_domains_suspend(struct drm_i915_private *dev_priv,
+ enum i915_drm_suspend_mode);
+void intel_power_domains_resume(struct drm_i915_private *dev_priv);
void intel_power_domains_verify_state(struct drm_i915_private *dev_priv);
void bxt_display_core_init(struct drm_i915_private *dev_priv, bool resume);
void bxt_display_core_uninit(struct drm_i915_private *dev_priv);
@@ -2037,8 +2048,6 @@ bool intel_runtime_pm_get_if_in_use(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_display_set_init_power(struct drm_i915_private *dev, bool enable);
-
void chv_phy_powergate_lanes(struct intel_encoder *encoder,
bool override, unsigned int mask);
bool chv_phy_powergate_ch(struct drm_i915_private *dev_priv, enum dpio_phy phy,
diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index c0983f0e46ac..6153d5be5cf6 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -257,30 +257,6 @@ bool intel_display_power_is_enabled(struct drm_i915_private *dev_priv,
return ret;
}
-/**
- * intel_display_set_init_power - set the initial power domain state
- * @dev_priv: i915 device instance
- * @enable: whether to enable or disable the initial power domain state
- *
- * For simplicity our driver load/unload and system suspend/resume code assumes
- * that all power domains are always enabled. This functions controls the state
- * of this little hack. While the initial power domain state is enabled runtime
- * pm is effectively disabled.
- */
-void intel_display_set_init_power(struct drm_i915_private *dev_priv,
- bool enable)
-{
- if (dev_priv->power_domains.init_power_on == enable)
- return;
-
- if (enable)
- intel_display_power_get(dev_priv, POWER_DOMAIN_INIT);
- else
- intel_display_power_put(dev_priv, POWER_DOMAIN_INIT);
-
- dev_priv->power_domains.init_power_on = enable;
-}
-
/*
* Starting with Haswell, we have a "Power Down Well" that can be turned off
* when not needed anymore. We have 4 registers that can request the power well
@@ -3750,6 +3726,10 @@ static void vlv_cmnlane_wa(struct drm_i915_private *dev_priv)
* domains (and not in the INIT domain) are referenced or disabled during the
* modeset state HW readout. After that the reference count of each power well
* must match its HW enabled state, see intel_power_domains_verify_state().
+ *
+ * It will return with power domains disabled (to be enabled later by
+ * intel_power_domains_enable()) and must be paired with
+ * intel_power_domains_fini_hw().
*/
void intel_power_domains_init_hw(struct drm_i915_private *dev_priv, bool resume)
{
@@ -3775,8 +3755,13 @@ void intel_power_domains_init_hw(struct drm_i915_private *dev_priv, bool resume)
mutex_unlock(&power_domains->lock);
}
- /* For now, we need the power well to be always enabled. */
- intel_display_set_init_power(dev_priv, true);
+ /*
+ * Keep all power wells enabled for any dependent HW access during
+ * initialization and to make sure we keep BIOS enabled display HW
+ * resources powered until display HW readout is complete. We drop
+ * this reference in intel_power_domains_enable().
+ */
+ intel_display_power_get(dev_priv, POWER_DOMAIN_INIT);
/* Disable power support if the user asked so. */
if (!i915_modparams.disable_power_well)
intel_display_power_get(dev_priv, POWER_DOMAIN_INIT);
@@ -3790,16 +3775,13 @@ void intel_power_domains_init_hw(struct drm_i915_private *dev_priv, bool resume)
*
* De-initializes the display power domain HW state. It also ensures that the
* device stays powered up so that the driver can be reloaded.
+ *
+ * It must be called with power domains already disabled (after a call to
+ * intel_power_domains_disable()) and must be paired with
+ * intel_power_domains_init_hw().
*/
void intel_power_domains_fini_hw(struct drm_i915_private *dev_priv)
{
- /*
- * The i915.ko module is still not prepared to be loaded when
- * the power well is not enabled, so just enable it in case
- * we're going to unload/reload.
- */
- intel_display_power_get(dev_priv, POWER_DOMAIN_INIT);
-
/* Keep the power well enabled, but cancel its rpm wakeref. */
intel_runtime_pm_put(dev_priv);
@@ -3809,17 +3791,66 @@ void intel_power_domains_fini_hw(struct drm_i915_private *dev_priv)
}
/**
+ * intel_power_domains_enable - enable toggling of display power wells
+ * @dev_priv: i915 device instance
+ *
+ * Enable the ondemand enabling/disabling of the display power wells. Note that
+ * power wells not belonging to POWER_DOMAIN_INIT are allowed to be toggled
+ * only at specific points of the display modeset sequence, thus they are not
+ * affected by the intel_power_domains_enable()/disable() calls. The purpose
+ * of these function is to keep the rest of power wells enabled until the end
+ * of display HW readout (which will acquire the power references reflecting
+ * the current HW state).
+ */
+void intel_power_domains_enable(struct drm_i915_private *dev_priv)
+{
+ intel_display_power_put(dev_priv, POWER_DOMAIN_INIT);
+}
+
+/**
+ * intel_power_domains_disable - disable toggling of display power wells
+ * @dev_priv: i915 device instance
+ *
+ * Disable the ondemand enabling/disabling of the display power wells. See
+ * intel_power_domains_enable() for which power wells this call controls.
+ */
+void intel_power_domains_disable(struct drm_i915_private *dev_priv)
+{
+ intel_display_power_get(dev_priv, POWER_DOMAIN_INIT);
+}
+
+/**
* intel_power_domains_suspend - suspend power domain state
* @dev_priv: i915 device instance
+ * @suspend_mode: specifies the target suspend state (idle, mem, hibernation)
*
* This function prepares the hardware power domain state before entering
- * system suspend. It must be paired with intel_power_domains_init_hw().
+ * system suspend.
+ *
+ * It must be called with power domains already disabled (after a call to
+ * intel_power_domains_disable()) and paired with intel_power_domains_resume().
*/
-void intel_power_domains_suspend(struct drm_i915_private *dev_priv)
+void intel_power_domains_suspend(struct drm_i915_private *dev_priv,
+ enum i915_drm_suspend_mode suspend_mode)
{
+ struct i915_power_domains *power_domains = &dev_priv->power_domains;
+
+ intel_display_power_put(dev_priv, POWER_DOMAIN_INIT);
+
+ /*
+ * In case of firmware assisted context save/restore don't manually
+ * deinit the power domains. This also means the CSR/DMC firmware will
+ * stay active, it will power down any HW resources as required and
+ * also enable deeper system power states that would be blocked if the
+ * firmware was inactive.
+ */
+ if (!IS_GEN9_LP(dev_priv) && suspend_mode == I915_DRM_SUSPEND_IDLE &&
+ dev_priv->csr.dmc_payload != NULL)
+ return;
+
/*
* Even if power well support was disabled we still want to disable
- * power wells while we are system suspended.
+ * power wells if power domains must be deinitialized for suspend.
*/
if (!i915_modparams.disable_power_well)
intel_display_power_put(dev_priv, POWER_DOMAIN_INIT);
@@ -3832,6 +3863,32 @@ void intel_power_domains_suspend(struct drm_i915_private *dev_priv)
skl_display_core_uninit(dev_priv);
else if (IS_GEN9_LP(dev_priv))
bxt_display_core_uninit(dev_priv);
+
+ power_domains->display_core_suspended = true;
+}
+
+/**
+ * intel_power_domains_resume - resume power domain state
+ * @dev_priv: i915 device instance
+ *
+ * This function resume the hardware power domain state during system resume.
+ *
+ * It will return with power domain support disabled (to be enabled later by
+ * intel_power_domains_enable()) and must be paired with
+ * intel_power_domains_suspend().
+ */
+void intel_power_domains_resume(struct drm_i915_private *dev_priv)
+{
+ struct i915_power_domains *power_domains = &dev_priv->power_domains;
+
+ if (power_domains->display_core_suspended) {
+ intel_power_domains_init_hw(dev_priv, true);
+ power_domains->display_core_suspended = false;
+
+ return;
+ }
+
+ intel_display_power_get(dev_priv, POWER_DOMAIN_INIT);
}
static void intel_power_domains_dump_info(struct drm_i915_private *dev_priv)
@@ -4030,8 +4087,8 @@ void intel_runtime_pm_put(struct drm_i915_private *dev_priv)
* This function enables runtime pm at the end of the driver load sequence.
*
* Note that this function does currently not enable runtime pm for the
- * subordinate display power domains. That is only done on the first modeset
- * using intel_display_set_init_power().
+ * subordinate display power domains. That is done by
+ * intel_power_domains_enable().
*/
void intel_runtime_pm_enable(struct drm_i915_private *dev_priv)
{
--
2.13.2
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