static int intel_runtime_resume(struct device *device)
{
struct pci_dev *pdev = to_pci_dev(device);
struct drm_device *dev = pci_get_drvdata(pdev);
struct drm_i915_private *dev_priv = dev->dev_private;
int ret = 0;
if (WARN_ON_ONCE(!HAS_RUNTIME_PM(dev)))
return -ENODEV;
DRM_DEBUG_KMS("Resuming device\n");
WARN_ON_ONCE(atomic_read(&dev_priv->pm.wakeref_count));
disable_rpm_wakeref_asserts(dev_priv);
intel_opregion_notify_adapter(dev, PCI_D0);
dev_priv->pm.suspended = false;
if (intel_uncore_unclaimed_mmio(dev_priv))
DRM_DEBUG_DRIVER("Unclaimed access during suspend, bios?\n");
intel_guc_resume(dev);
if (IS_GEN6(dev_priv))
intel_init_pch_refclk(dev);
if (IS_BROXTON(dev))
ret = bxt_resume_prepare(dev_priv);
else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
hsw_disable_pc8(dev_priv);
else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
ret = vlv_resume_prepare(dev_priv, true);
/*
* No point of rolling back things in case of an error, as the best
* we can do is to hope that things will still work (and disable RPM).
*/
i915_gem_init_swizzling(dev);
gen6_update_ring_freq(dev);
intel_runtime_pm_enable_interrupts(dev_priv);
/*
* On VLV/CHV display interrupts are part of the display
* power well, so hpd is reinitialized from there. For
* everyone else do it here.
*/
if (!IS_VALLEYVIEW(dev_priv) && !IS_CHERRYVIEW(dev_priv))
intel_hpd_init(dev_priv);
intel_enable_gt_powersave(dev);
enable_rpm_wakeref_asserts(dev_priv);
if (ret)
DRM_ERROR("Runtime resume failed, disabling it (%d)\n", ret);
else
DRM_DEBUG_KMS("Device resumed\n");
return ret;
}
int intel_uc_resume(struct drm_i915_private *i915)
{
struct intel_guc *guc = &i915->guc;
int err;
if (!intel_guc_is_loaded(guc))
return 0;
guc_enable_communication(guc);
err = intel_guc_resume(guc);
if (err) {
DRM_DEBUG_DRIVER("Failed to resume GuC, err=%d", err);
return err;
}
return 0;
}
static int i915_drm_resume(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
disable_rpm_wakeref_asserts(dev_priv);
mutex_lock(&dev->struct_mutex);
i915_gem_restore_gtt_mappings(dev);
mutex_unlock(&dev->struct_mutex);
i915_restore_state(dev);
intel_opregion_setup(dev);
intel_init_pch_refclk(dev);
drm_mode_config_reset(dev);
/*
* Interrupts have to be enabled before any batches are run. If not the
* GPU will hang. i915_gem_init_hw() will initiate batches to
* update/restore the context.
*
* Modeset enabling in intel_modeset_init_hw() also needs working
* interrupts.
*/
intel_runtime_pm_enable_interrupts(dev_priv);
mutex_lock(&dev->struct_mutex);
if (i915_gem_init_hw(dev)) {
DRM_ERROR("failed to re-initialize GPU, declaring wedged!\n");
atomic_or(I915_WEDGED, &dev_priv->gpu_error.reset_counter);
}
mutex_unlock(&dev->struct_mutex);
intel_guc_resume(dev);
intel_modeset_init_hw(dev);
spin_lock_irq(&dev_priv->irq_lock);
if (dev_priv->display.hpd_irq_setup)
dev_priv->display.hpd_irq_setup(dev);
spin_unlock_irq(&dev_priv->irq_lock);
intel_dp_mst_resume(dev);
intel_display_resume(dev);
/*
* ... but also need to make sure that hotplug processing
* doesn't cause havoc. Like in the driver load code we don't
* bother with the tiny race here where we might loose hotplug
* notifications.
* */
intel_hpd_init(dev_priv);
/* Config may have changed between suspend and resume */
drm_helper_hpd_irq_event(dev);
intel_opregion_init(dev);
intel_fbdev_set_suspend(dev, FBINFO_STATE_RUNNING, false);
mutex_lock(&dev_priv->modeset_restore_lock);
dev_priv->modeset_restore = MODESET_DONE;
mutex_unlock(&dev_priv->modeset_restore_lock);
intel_opregion_notify_adapter(dev, PCI_D0);
drm_kms_helper_poll_enable(dev);
enable_rpm_wakeref_asserts(dev_priv);
return 0;
}
