drivers/gpu/drm/radeon/radeon_pm.c - maze/linux - Git at Google

 /*
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
  * to deal in the Software without restriction, including without limitation
  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  * and/or sell copies of the Software, and to permit persons to whom the
  * Software is furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  * OTHER DEALINGS IN THE SOFTWARE.
  *
  * Authors: Rafał Miłecki <zajec5@gmail.com>
  *          Alex Deucher <alexdeucher@gmail.com>
  */
 #include "drmP.h"
 #include "radeon.h"
 #include "avivod.h"

 #define RADEON_IDLE_LOOP_MS 100
 #define RADEON_RECLOCK_DELAY_MS 200
 #define RADEON_WAIT_VBLANK_TIMEOUT 200
 #define RADEON_WAIT_IDLE_TIMEOUT 200

 static void radeon_pm_idle_work_handler(struct work_struct *work);
 static int radeon_debugfs_pm_init(struct radeon_device *rdev);

 static void radeon_unmap_vram_bos(struct radeon_device *rdev)
 {
 	struct radeon_bo *bo, *n;

 	if (list_empty(&rdev->gem.objects))
 		return;

 	list_for_each_entry_safe(bo, n, &rdev->gem.objects, list) {
 		if (bo->tbo.mem.mem_type == TTM_PL_VRAM)
 			ttm_bo_unmap_virtual(&bo->tbo);
 	}

 	if (rdev->gart.table.vram.robj)
 		ttm_bo_unmap_virtual(&rdev->gart.table.vram.robj->tbo);

 	if (rdev->stollen_vga_memory)
 		ttm_bo_unmap_virtual(&rdev->stollen_vga_memory->tbo);

 	if (rdev->r600_blit.shader_obj)
 		ttm_bo_unmap_virtual(&rdev->r600_blit.shader_obj->tbo);
 }

 static void radeon_pm_set_clocks(struct radeon_device *rdev, int static_switch)
 {
 	int i;

 	if (rdev->pm.state != PM_STATE_DISABLED)
 		radeon_get_power_state(rdev, rdev->pm.planned_action);

 	mutex_lock(&rdev->ddev->struct_mutex);
 	mutex_lock(&rdev->vram_mutex);
 	mutex_lock(&rdev->cp.mutex);

 	/* gui idle int has issues on older chips it seems */
 	if (rdev->family >= CHIP_R600) {
 		/* wait for GPU idle */
 		rdev->pm.gui_idle = false;
 		rdev->irq.gui_idle = true;
 		radeon_irq_set(rdev);
 		wait_event_interruptible_timeout(
 			rdev->irq.idle_queue, rdev->pm.gui_idle,
 			msecs_to_jiffies(RADEON_WAIT_IDLE_TIMEOUT));
 		rdev->irq.gui_idle = false;
 		radeon_irq_set(rdev);
 	} else {
 		struct radeon_fence *fence;
 		radeon_ring_alloc(rdev, 64);
 		radeon_fence_create(rdev, &fence);
 		radeon_fence_emit(rdev, fence);
 		radeon_ring_commit(rdev);
 		radeon_fence_wait(fence, false);
 		radeon_fence_unref(&fence);
 	}
 	radeon_unmap_vram_bos(rdev);

 	if (!static_switch) {
 		for (i = 0; i < rdev->num_crtc; i++) {
 			if (rdev->pm.active_crtcs & (1 << i)) {
 				rdev->pm.req_vblank |= (1 << i);
 				drm_vblank_get(rdev->ddev, i);
 			}
 		}
 	}

 	radeon_set_power_state(rdev, static_switch);

 	if (!static_switch) {
 		for (i = 0; i < rdev->num_crtc; i++) {
 			if (rdev->pm.req_vblank & (1 << i)) {
 				rdev->pm.req_vblank &= ~(1 << i);
 				drm_vblank_put(rdev->ddev, i);
 			}
 		}
 	}

 	/* update display watermarks based on new power state */
 	radeon_update_bandwidth_info(rdev);
 	if (rdev->pm.active_crtc_count)
 		radeon_bandwidth_update(rdev);

 	rdev->pm.planned_action = PM_ACTION_NONE;

 	mutex_unlock(&rdev->cp.mutex);
 	mutex_unlock(&rdev->vram_mutex);
 	mutex_unlock(&rdev->ddev->struct_mutex);
 }

 static ssize_t radeon_get_power_state_static(struct device *dev,
 					     struct device_attribute *attr,
 					     char *buf)
 {
 	struct drm_device *ddev = pci_get_drvdata(to_pci_dev(dev));
 	struct radeon_device *rdev = ddev->dev_private;

 	return snprintf(buf, PAGE_SIZE, "%d.%d\n", rdev->pm.current_power_state_index,
 			rdev->pm.current_clock_mode_index);
 }

 static ssize_t radeon_set_power_state_static(struct device *dev,
 					     struct device_attribute *attr,
 					     const char *buf,
 					     size_t count)
 {
 	struct drm_device *ddev = pci_get_drvdata(to_pci_dev(dev));
 	struct radeon_device *rdev = ddev->dev_private;
 	int ps, cm;

 	if (sscanf(buf, "%u.%u", &ps, &cm) != 2) {
 		DRM_ERROR("Invalid power state!\n");
 		return count;
 	}

 	mutex_lock(&rdev->pm.mutex);
 	if ((ps >= 0) && (ps < rdev->pm.num_power_states) &&
 	    (cm >= 0) && (cm < rdev->pm.power_state[ps].num_clock_modes)) {
 		if ((rdev->pm.active_crtc_count > 0) &&
 		    (rdev->pm.power_state[ps].clock_info[cm].flags & RADEON_PM_MODE_NO_DISPLAY)) {
 			DRM_ERROR("Invalid power state for display: %d.%d\n", ps, cm);
 		} else if ((rdev->pm.active_crtc_count > 1) &&
 			   (rdev->pm.power_state[ps].flags & RADEON_PM_STATE_SINGLE_DISPLAY_ONLY)) {
 			DRM_ERROR("Invalid power state for multi-head: %d.%d\n", ps, cm);
 		} else {
 			/* disable dynpm */
 			rdev->pm.state = PM_STATE_DISABLED;
 			rdev->pm.planned_action = PM_ACTION_NONE;
 			rdev->pm.requested_power_state_index = ps;
 			rdev->pm.requested_clock_mode_index = cm;
 			radeon_pm_set_clocks(rdev, true);
 		}
 	} else
 		DRM_ERROR("Invalid power state: %d.%d\n\n", ps, cm);
 	mutex_unlock(&rdev->pm.mutex);

 	return count;
 }

 static ssize_t radeon_get_dynpm(struct device *dev,
 				struct device_attribute *attr,
 				char *buf)
 {
 	struct drm_device *ddev = pci_get_drvdata(to_pci_dev(dev));
 	struct radeon_device *rdev = ddev->dev_private;

 	return snprintf(buf, PAGE_SIZE, "%s\n",
 			(rdev->pm.state == PM_STATE_DISABLED) ? "disabled" : "enabled");
 }

 static ssize_t radeon_set_dynpm(struct device *dev,
 				struct device_attribute *attr,
 				const char *buf,
 				size_t count)
 {
 	struct drm_device *ddev = pci_get_drvdata(to_pci_dev(dev));
 	struct radeon_device *rdev = ddev->dev_private;
 	int tmp = simple_strtoul(buf, NULL, 10);

 	if (tmp == 0) {
 		/* update power mode info */
 		radeon_pm_compute_clocks(rdev);
 		/* disable dynpm */
 		mutex_lock(&rdev->pm.mutex);
 		rdev->pm.state = PM_STATE_DISABLED;
 		rdev->pm.planned_action = PM_ACTION_NONE;
 		mutex_unlock(&rdev->pm.mutex);
 		DRM_INFO("radeon: dynamic power management disabled\n");
 	} else if (tmp == 1) {
 		if (rdev->pm.num_power_states > 1) {
 			/* enable dynpm */
 			mutex_lock(&rdev->pm.mutex);
 			rdev->pm.state = PM_STATE_PAUSED;
 			rdev->pm.planned_action = PM_ACTION_DEFAULT;
 			radeon_get_power_state(rdev, rdev->pm.planned_action);
 			mutex_unlock(&rdev->pm.mutex);
 			/* update power mode info */
 			radeon_pm_compute_clocks(rdev);
 			DRM_INFO("radeon: dynamic power management enabled\n");
 		} else
 			DRM_ERROR("dynpm not valid on this system\n");
 	} else
 		DRM_ERROR("Invalid setting: %d\n", tmp);

 	return count;
 }

 static DEVICE_ATTR(power_state, S_IRUGO | S_IWUSR, radeon_get_power_state_static, radeon_set_power_state_static);
 static DEVICE_ATTR(dynpm, S_IRUGO | S_IWUSR, radeon_get_dynpm, radeon_set_dynpm);


 static const char *pm_state_names[4] = {
 	"PM_STATE_DISABLED",
 	"PM_STATE_MINIMUM",
 	"PM_STATE_PAUSED",
 	"PM_STATE_ACTIVE"
 };

 static const char *pm_state_types[5] = {
 	"",
 	"Powersave",
 	"Battery",
 	"Balanced",
 	"Performance",
 };

 static void radeon_print_power_mode_info(struct radeon_device *rdev)
 {
 	int i, j;
 	bool is_default;

 	DRM_INFO("%d Power State(s)\n", rdev->pm.num_power_states);
 	for (i = 0; i < rdev->pm.num_power_states; i++) {
 		if (rdev->pm.default_power_state_index == i)
 			is_default = true;
 		else
 			is_default = false;
 		DRM_INFO("State %d %s %s\n", i,
 			 pm_state_types[rdev->pm.power_state[i].type],
 			 is_default ? "(default)" : "");
 		if ((rdev->flags & RADEON_IS_PCIE) && !(rdev->flags & RADEON_IS_IGP))
 			DRM_INFO("\t%d PCIE Lanes\n", rdev->pm.power_state[i].pcie_lanes);
 		if (rdev->pm.power_state[i].flags & RADEON_PM_STATE_SINGLE_DISPLAY_ONLY)
 			DRM_INFO("\tSingle display only\n");
 		DRM_INFO("\t%d Clock Mode(s)\n", rdev->pm.power_state[i].num_clock_modes);
 		for (j = 0; j < rdev->pm.power_state[i].num_clock_modes; j++) {
 			if (rdev->flags & RADEON_IS_IGP)
 				DRM_INFO("\t\t%d engine: %d\n",
 					 j,
 					 rdev->pm.power_state[i].clock_info[j].sclk * 10);
 			else
 				DRM_INFO("\t\t%d engine/memory: %d/%d\n",
 					 j,
 					 rdev->pm.power_state[i].clock_info[j].sclk * 10,
 					 rdev->pm.power_state[i].clock_info[j].mclk * 10);
 			if (rdev->pm.power_state[i].clock_info[j].flags & RADEON_PM_MODE_NO_DISPLAY)
 				DRM_INFO("\t\tNo display only\n");
 		}
 	}
 }

 void radeon_sync_with_vblank(struct radeon_device *rdev)
 {
 	if (rdev->pm.active_crtcs) {
 		rdev->pm.vblank_sync = false;
 		wait_event_timeout(
 			rdev->irq.vblank_queue, rdev->pm.vblank_sync,
 			msecs_to_jiffies(RADEON_WAIT_VBLANK_TIMEOUT));
 	}
 }

 int radeon_pm_init(struct radeon_device *rdev)
 {
 	rdev->pm.state = PM_STATE_DISABLED;
 	rdev->pm.planned_action = PM_ACTION_NONE;
 	rdev->pm.can_upclock = true;
 	rdev->pm.can_downclock = true;

 	if (rdev->bios) {
 		if (rdev->is_atom_bios)
 			radeon_atombios_get_power_modes(rdev);
 		else
 			radeon_combios_get_power_modes(rdev);
 		radeon_print_power_mode_info(rdev);
 	}

 	if (radeon_debugfs_pm_init(rdev)) {
 		DRM_ERROR("Failed to register debugfs file for PM!\n");
 	}

 	/* where's the best place to put this? */
 	device_create_file(rdev->dev, &dev_attr_power_state);
 	device_create_file(rdev->dev, &dev_attr_dynpm);

 	INIT_DELAYED_WORK(&rdev->pm.idle_work, radeon_pm_idle_work_handler);

 	if ((radeon_dynpm != -1 && radeon_dynpm) && (rdev->pm.num_power_states > 1)) {
 		rdev->pm.state = PM_STATE_PAUSED;
 		DRM_INFO("radeon: dynamic power management enabled\n");
 	}

 	DRM_INFO("radeon: power management initialized\n");

 	return 0;
 }

 void radeon_pm_fini(struct radeon_device *rdev)
 {
 	if (rdev->pm.state != PM_STATE_DISABLED) {
 		/* cancel work */
 		cancel_delayed_work_sync(&rdev->pm.idle_work);
 		/* reset default clocks */
 		rdev->pm.state = PM_STATE_DISABLED;
 		rdev->pm.planned_action = PM_ACTION_DEFAULT;
 		radeon_pm_set_clocks(rdev, true);
 	} else if ((rdev->pm.current_power_state_index !=
 		    rdev->pm.default_power_state_index) ||
 		   (rdev->pm.current_clock_mode_index != 0)) {
 		rdev->pm.requested_power_state_index = rdev->pm.default_power_state_index;
 		rdev->pm.requested_clock_mode_index = 0;
 		mutex_lock(&rdev->pm.mutex);
 		radeon_pm_set_clocks(rdev, true);
 		mutex_unlock(&rdev->pm.mutex);
 	}

 	device_remove_file(rdev->dev, &dev_attr_power_state);
 	device_remove_file(rdev->dev, &dev_attr_dynpm);

 	if (rdev->pm.i2c_bus)
 		radeon_i2c_destroy(rdev->pm.i2c_bus);
 }

 void radeon_pm_compute_clocks(struct radeon_device *rdev)
 {
 	struct drm_device *ddev = rdev->ddev;
 	struct drm_crtc *crtc;
 	struct radeon_crtc *radeon_crtc;

 	mutex_lock(&rdev->pm.mutex);

 	rdev->pm.active_crtcs = 0;
 	rdev->pm.active_crtc_count = 0;
 	list_for_each_entry(crtc,
 		&ddev->mode_config.crtc_list, head) {
 		radeon_crtc = to_radeon_crtc(crtc);
 		if (radeon_crtc->enabled) {
 			rdev->pm.active_crtcs |= (1 << radeon_crtc->crtc_id);
 			rdev->pm.active_crtc_count++;
 		}
 	}

 	if (rdev->pm.state == PM_STATE_DISABLED) {
 		mutex_unlock(&rdev->pm.mutex);
 		return;
 	}

 	/* Note, radeon_pm_set_clocks is called with static_switch set
 	 * to true since we always want to statically set the clocks,
 	 * not wait for vbl.
 	 */
 	if (rdev->pm.active_crtc_count > 1) {
 		if (rdev->pm.state == PM_STATE_ACTIVE) {
 			cancel_delayed_work(&rdev->pm.idle_work);

 			rdev->pm.state = PM_STATE_PAUSED;
 			rdev->pm.planned_action = PM_ACTION_DEFAULT;
 			radeon_pm_set_clocks(rdev, true);

 			DRM_DEBUG("radeon: dynamic power management deactivated\n");
 		}
 	} else if (rdev->pm.active_crtc_count == 1) {
 		/* TODO: Increase clocks if needed for current mode */

 		if (rdev->pm.state == PM_STATE_MINIMUM) {
 			rdev->pm.state = PM_STATE_ACTIVE;
 			rdev->pm.planned_action = PM_ACTION_UPCLOCK;
 			radeon_pm_set_clocks(rdev, true);

 			queue_delayed_work(rdev->wq, &rdev->pm.idle_work,
 				msecs_to_jiffies(RADEON_IDLE_LOOP_MS));
 		} else if (rdev->pm.state == PM_STATE_PAUSED) {
 			rdev->pm.state = PM_STATE_ACTIVE;
 			queue_delayed_work(rdev->wq, &rdev->pm.idle_work,
 				msecs_to_jiffies(RADEON_IDLE_LOOP_MS));
 			DRM_DEBUG("radeon: dynamic power management activated\n");
 		}
 	} else { /* count == 0 */
 		if (rdev->pm.state != PM_STATE_MINIMUM) {
 			cancel_delayed_work(&rdev->pm.idle_work);

 			rdev->pm.state = PM_STATE_MINIMUM;
 			rdev->pm.planned_action = PM_ACTION_MINIMUM;
 			radeon_pm_set_clocks(rdev, true);
 		}
 	}

 	mutex_unlock(&rdev->pm.mutex);
 }

 bool radeon_pm_in_vbl(struct radeon_device *rdev)
 {
 	u32 stat_crtc = 0, vbl = 0, position = 0;
 	bool in_vbl = true;

 	if (ASIC_IS_DCE4(rdev)) {
 		if (rdev->pm.active_crtcs & (1 << 0)) {
 			vbl = RREG32(EVERGREEN_CRTC_V_BLANK_START_END +
 				     EVERGREEN_CRTC0_REGISTER_OFFSET) & 0xfff;
 			position = RREG32(EVERGREEN_CRTC_STATUS_POSITION +
 					  EVERGREEN_CRTC0_REGISTER_OFFSET) & 0xfff;
 		}
 		if (rdev->pm.active_crtcs & (1 << 1)) {
 			vbl = RREG32(EVERGREEN_CRTC_V_BLANK_START_END +
 				     EVERGREEN_CRTC1_REGISTER_OFFSET) & 0xfff;
 			position = RREG32(EVERGREEN_CRTC_STATUS_POSITION +
 					  EVERGREEN_CRTC1_REGISTER_OFFSET) & 0xfff;
 		}
 		if (rdev->pm.active_crtcs & (1 << 2)) {
 			vbl = RREG32(EVERGREEN_CRTC_V_BLANK_START_END +
 				     EVERGREEN_CRTC2_REGISTER_OFFSET) & 0xfff;
 			position = RREG32(EVERGREEN_CRTC_STATUS_POSITION +
 					  EVERGREEN_CRTC2_REGISTER_OFFSET) & 0xfff;
 		}
 		if (rdev->pm.active_crtcs & (1 << 3)) {
 			vbl = RREG32(EVERGREEN_CRTC_V_BLANK_START_END +
 				     EVERGREEN_CRTC3_REGISTER_OFFSET) & 0xfff;
 			position = RREG32(EVERGREEN_CRTC_STATUS_POSITION +
 					  EVERGREEN_CRTC3_REGISTER_OFFSET) & 0xfff;
 		}
 		if (rdev->pm.active_crtcs & (1 << 4)) {
 			vbl = RREG32(EVERGREEN_CRTC_V_BLANK_START_END +
 				     EVERGREEN_CRTC4_REGISTER_OFFSET) & 0xfff;
 			position = RREG32(EVERGREEN_CRTC_STATUS_POSITION +
 					  EVERGREEN_CRTC4_REGISTER_OFFSET) & 0xfff;
 		}
 		if (rdev->pm.active_crtcs & (1 << 5)) {
 			vbl = RREG32(EVERGREEN_CRTC_V_BLANK_START_END +
 				     EVERGREEN_CRTC5_REGISTER_OFFSET) & 0xfff;
 			position = RREG32(EVERGREEN_CRTC_STATUS_POSITION +
 					  EVERGREEN_CRTC5_REGISTER_OFFSET) & 0xfff;
 		}
 	} else if (ASIC_IS_AVIVO(rdev)) {
 		if (rdev->pm.active_crtcs & (1 << 0)) {
 			vbl = RREG32(AVIVO_D1CRTC_V_BLANK_START_END) & 0xfff;
 			position = RREG32(AVIVO_D1CRTC_STATUS_POSITION) & 0xfff;
 		}
 		if (rdev->pm.active_crtcs & (1 << 1)) {
 			vbl = RREG32(AVIVO_D2CRTC_V_BLANK_START_END) & 0xfff;
 			position = RREG32(AVIVO_D2CRTC_STATUS_POSITION) & 0xfff;
 		}
 		if (position < vbl && position > 1)
 			in_vbl = false;
 	} else {
 		if (rdev->pm.active_crtcs & (1 << 0)) {
 			stat_crtc = RREG32(RADEON_CRTC_STATUS);
 			if (!(stat_crtc & 1))
 				in_vbl = false;
 		}
 		if (rdev->pm.active_crtcs & (1 << 1)) {
 			stat_crtc = RREG32(RADEON_CRTC2_STATUS);
 			if (!(stat_crtc & 1))
 				in_vbl = false;
 		}
 	}

 	if (position < vbl && position > 1)
 		in_vbl = false;

 	return in_vbl;
 }

 bool radeon_pm_debug_check_in_vbl(struct radeon_device *rdev, bool finish)
 {
 	u32 stat_crtc = 0;
 	bool in_vbl = radeon_pm_in_vbl(rdev);

 	if (in_vbl == false)
 		DRM_INFO("not in vbl for pm change %08x at %s\n", stat_crtc,
 			 finish ? "exit" : "entry");
 	return in_vbl;
 }

 static void radeon_pm_idle_work_handler(struct work_struct *work)
 {
 	struct radeon_device *rdev;
 	int resched;
 	rdev = container_of(work, struct radeon_device,
 				pm.idle_work.work);

 	resched = ttm_bo_lock_delayed_workqueue(&rdev->mman.bdev);
 	mutex_lock(&rdev->pm.mutex);
 	if (rdev->pm.state == PM_STATE_ACTIVE) {
 		unsigned long irq_flags;
 		int not_processed = 0;

 		read_lock_irqsave(&rdev->fence_drv.lock, irq_flags);
 		if (!list_empty(&rdev->fence_drv.emited)) {
 			struct list_head *ptr;
 			list_for_each(ptr, &rdev->fence_drv.emited) {
 				/* count up to 3, that's enought info */
 				if (++not_processed >= 3)
 					break;
 			}
 		}
 		read_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);

 		if (not_processed >= 3) { /* should upclock */
 			if (rdev->pm.planned_action == PM_ACTION_DOWNCLOCK) {
 				rdev->pm.planned_action = PM_ACTION_NONE;
 			} else if (rdev->pm.planned_action == PM_ACTION_NONE &&
 				   rdev->pm.can_upclock) {
 				rdev->pm.planned_action =
 					PM_ACTION_UPCLOCK;
 				rdev->pm.action_timeout = jiffies +
 				msecs_to_jiffies(RADEON_RECLOCK_DELAY_MS);
 			}
 		} else if (not_processed == 0) { /* should downclock */
 			if (rdev->pm.planned_action == PM_ACTION_UPCLOCK) {
 				rdev->pm.planned_action = PM_ACTION_NONE;
 			} else if (rdev->pm.planned_action == PM_ACTION_NONE &&
 				   rdev->pm.can_downclock) {
 				rdev->pm.planned_action =
 					PM_ACTION_DOWNCLOCK;
 				rdev->pm.action_timeout = jiffies +
 				msecs_to_jiffies(RADEON_RECLOCK_DELAY_MS);
 			}
 		}

 		/* Note, radeon_pm_set_clocks is called with static_switch set
 		 * to false since we want to wait for vbl to avoid flicker.
 		 */
 		if (rdev->pm.planned_action != PM_ACTION_NONE &&
 		    jiffies > rdev->pm.action_timeout) {
 			radeon_pm_set_clocks(rdev, false);
 		}
 	}
 	mutex_unlock(&rdev->pm.mutex);
 	ttm_bo_unlock_delayed_workqueue(&rdev->mman.bdev, resched);

 	queue_delayed_work(rdev->wq, &rdev->pm.idle_work,
 					msecs_to_jiffies(RADEON_IDLE_LOOP_MS));
 }

 /*
  * Debugfs info
  */
 #if defined(CONFIG_DEBUG_FS)

 static int radeon_debugfs_pm_info(struct seq_file *m, void *data)
 {
 	struct drm_info_node *node = (struct drm_info_node *) m->private;
 	struct drm_device *dev = node->minor->dev;
 	struct radeon_device *rdev = dev->dev_private;

 	seq_printf(m, "state: %s\n", pm_state_names[rdev->pm.state]);
 	seq_printf(m, "default engine clock: %u0 kHz\n", rdev->clock.default_sclk);
 	seq_printf(m, "current engine clock: %u0 kHz\n", radeon_get_engine_clock(rdev));
 	seq_printf(m, "default memory clock: %u0 kHz\n", rdev->clock.default_mclk);
 	if (rdev->asic->get_memory_clock)
 		seq_printf(m, "current memory clock: %u0 kHz\n", radeon_get_memory_clock(rdev));
 	if (rdev->asic->get_pcie_lanes)
 		seq_printf(m, "PCIE lanes: %d\n", radeon_get_pcie_lanes(rdev));

 	return 0;
 }

 static struct drm_info_list radeon_pm_info_list[] = {
 	{"radeon_pm_info", radeon_debugfs_pm_info, 0, NULL},
 };
 #endif

 static int radeon_debugfs_pm_init(struct radeon_device *rdev)
 {
 #if defined(CONFIG_DEBUG_FS)
 	return radeon_debugfs_add_files(rdev, radeon_pm_info_list, ARRAY_SIZE(radeon_pm_info_list));
 #else
 	return 0;
 #endif
 }
	/*
	* Permission is hereby granted, free of charge, to any person obtaining a
	* copy of this software and associated documentation files (the "Software"),
	* to deal in the Software without restriction, including without limitation
	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	* and/or sell copies of the Software, and to permit persons to whom the
	* Software is furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice shall be included in
	* all copies or substantial portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	* OTHER DEALINGS IN THE SOFTWARE.
	*
	* Authors: Rafał Miłecki <zajec5@gmail.com>
	* Alex Deucher <alexdeucher@gmail.com>
	*/
	#include "drmP.h"
	#include "radeon.h"
	#include "avivod.h"

	#define RADEON_IDLE_LOOP_MS 100
	#define RADEON_RECLOCK_DELAY_MS 200
	#define RADEON_WAIT_VBLANK_TIMEOUT 200
	#define RADEON_WAIT_IDLE_TIMEOUT 200

	static void radeon_pm_idle_work_handler(struct work_struct *work);
	static int radeon_debugfs_pm_init(struct radeon_device *rdev);

	static void radeon_unmap_vram_bos(struct radeon_device *rdev)
	{
	struct radeon_bo bo, n;

	if (list_empty(&rdev->gem.objects))
	return;

	list_for_each_entry_safe(bo, n, &rdev->gem.objects, list) {
	if (bo->tbo.mem.mem_type == TTM_PL_VRAM)
	ttm_bo_unmap_virtual(&bo->tbo);
	}

	if (rdev->gart.table.vram.robj)
	ttm_bo_unmap_virtual(&rdev->gart.table.vram.robj->tbo);

	if (rdev->stollen_vga_memory)
	ttm_bo_unmap_virtual(&rdev->stollen_vga_memory->tbo);

	if (rdev->r600_blit.shader_obj)
	ttm_bo_unmap_virtual(&rdev->r600_blit.shader_obj->tbo);
	}

	static void radeon_pm_set_clocks(struct radeon_device *rdev, int static_switch)
	{
	int i;

	if (rdev->pm.state != PM_STATE_DISABLED)
	radeon_get_power_state(rdev, rdev->pm.planned_action);

	mutex_lock(&rdev->ddev->struct_mutex);
	mutex_lock(&rdev->vram_mutex);
	mutex_lock(&rdev->cp.mutex);

	/* gui idle int has issues on older chips it seems */
	if (rdev->family >= CHIP_R600) {
	/* wait for GPU idle */
	rdev->pm.gui_idle = false;
	rdev->irq.gui_idle = true;
	radeon_irq_set(rdev);
	wait_event_interruptible_timeout(
	rdev->irq.idle_queue, rdev->pm.gui_idle,
	msecs_to_jiffies(RADEON_WAIT_IDLE_TIMEOUT));
	rdev->irq.gui_idle = false;
	radeon_irq_set(rdev);
	} else {
	struct radeon_fence *fence;
	radeon_ring_alloc(rdev, 64);
	radeon_fence_create(rdev, &fence);
	radeon_fence_emit(rdev, fence);
	radeon_ring_commit(rdev);
	radeon_fence_wait(fence, false);
	radeon_fence_unref(&fence);
	}
	radeon_unmap_vram_bos(rdev);

	if (!static_switch) {
	for (i = 0; i < rdev->num_crtc; i++) {
	if (rdev->pm.active_crtcs & (1 << i)) {
	rdev->pm.req_vblank \|= (1 << i);
	drm_vblank_get(rdev->ddev, i);
	}
	}
	}

	radeon_set_power_state(rdev, static_switch);

	if (!static_switch) {
	for (i = 0; i < rdev->num_crtc; i++) {
	if (rdev->pm.req_vblank & (1 << i)) {
	rdev->pm.req_vblank &= ~(1 << i);
	drm_vblank_put(rdev->ddev, i);
	}
	}
	}

	/* update display watermarks based on new power state */
	radeon_update_bandwidth_info(rdev);
	if (rdev->pm.active_crtc_count)
	radeon_bandwidth_update(rdev);

	rdev->pm.planned_action = PM_ACTION_NONE;

	mutex_unlock(&rdev->cp.mutex);
	mutex_unlock(&rdev->vram_mutex);
	mutex_unlock(&rdev->ddev->struct_mutex);
	}

	static ssize_t radeon_get_power_state_static(struct device *dev,
	struct device_attribute *attr,
	char *buf)
	{
	struct drm_device *ddev = pci_get_drvdata(to_pci_dev(dev));
	struct radeon_device *rdev = ddev->dev_private;

	return snprintf(buf, PAGE_SIZE, "%d.%d\n", rdev->pm.current_power_state_index,
	rdev->pm.current_clock_mode_index);
	}

	static ssize_t radeon_set_power_state_static(struct device *dev,
	struct device_attribute *attr,
	const char *buf,
	size_t count)
	{
	struct drm_device *ddev = pci_get_drvdata(to_pci_dev(dev));
	struct radeon_device *rdev = ddev->dev_private;
	int ps, cm;

	if (sscanf(buf, "%u.%u", &ps, &cm) != 2) {
	DRM_ERROR("Invalid power state!\n");
	return count;
	}

	mutex_lock(&rdev->pm.mutex);
	if ((ps >= 0) && (ps < rdev->pm.num_power_states) &&
	(cm >= 0) && (cm < rdev->pm.power_state[ps].num_clock_modes)) {
	if ((rdev->pm.active_crtc_count > 0) &&
	(rdev->pm.power_state[ps].clock_info[cm].flags & RADEON_PM_MODE_NO_DISPLAY)) {
	DRM_ERROR("Invalid power state for display: %d.%d\n", ps, cm);
	} else if ((rdev->pm.active_crtc_count > 1) &&
	(rdev->pm.power_state[ps].flags & RADEON_PM_STATE_SINGLE_DISPLAY_ONLY)) {
	DRM_ERROR("Invalid power state for multi-head: %d.%d\n", ps, cm);
	} else {
	/* disable dynpm */
	rdev->pm.state = PM_STATE_DISABLED;
	rdev->pm.planned_action = PM_ACTION_NONE;
	rdev->pm.requested_power_state_index = ps;
	rdev->pm.requested_clock_mode_index = cm;
	radeon_pm_set_clocks(rdev, true);
	}
	} else
	DRM_ERROR("Invalid power state: %d.%d\n\n", ps, cm);
	mutex_unlock(&rdev->pm.mutex);

	return count;
	}

	static ssize_t radeon_get_dynpm(struct device *dev,
	struct device_attribute *attr,
	char *buf)
	{
	struct drm_device *ddev = pci_get_drvdata(to_pci_dev(dev));
	struct radeon_device *rdev = ddev->dev_private;

	return snprintf(buf, PAGE_SIZE, "%s\n",
	(rdev->pm.state == PM_STATE_DISABLED) ? "disabled" : "enabled");
	}

	static ssize_t radeon_set_dynpm(struct device *dev,
	struct device_attribute *attr,
	const char *buf,
	size_t count)
	{
	struct drm_device *ddev = pci_get_drvdata(to_pci_dev(dev));
	struct radeon_device *rdev = ddev->dev_private;
	int tmp = simple_strtoul(buf, NULL, 10);

	if (tmp == 0) {
	/* update power mode info */
	radeon_pm_compute_clocks(rdev);
	/* disable dynpm */
	mutex_lock(&rdev->pm.mutex);
	rdev->pm.state = PM_STATE_DISABLED;
	rdev->pm.planned_action = PM_ACTION_NONE;
	mutex_unlock(&rdev->pm.mutex);
	DRM_INFO("radeon: dynamic power management disabled\n");
	} else if (tmp == 1) {
	if (rdev->pm.num_power_states > 1) {
	/* enable dynpm */
	mutex_lock(&rdev->pm.mutex);
	rdev->pm.state = PM_STATE_PAUSED;
	rdev->pm.planned_action = PM_ACTION_DEFAULT;
	radeon_get_power_state(rdev, rdev->pm.planned_action);
	mutex_unlock(&rdev->pm.mutex);
	/* update power mode info */
	radeon_pm_compute_clocks(rdev);
	DRM_INFO("radeon: dynamic power management enabled\n");
	} else
	DRM_ERROR("dynpm not valid on this system\n");
	} else
	DRM_ERROR("Invalid setting: %d\n", tmp);

	return count;
	}

	static DEVICE_ATTR(power_state, S_IRUGO \| S_IWUSR, radeon_get_power_state_static, radeon_set_power_state_static);
	static DEVICE_ATTR(dynpm, S_IRUGO \| S_IWUSR, radeon_get_dynpm, radeon_set_dynpm);


	static const char *pm_state_names[4] = {
	"PM_STATE_DISABLED",
	"PM_STATE_MINIMUM",
	"PM_STATE_PAUSED",
	"PM_STATE_ACTIVE"
	};

	static const char *pm_state_types[5] = {
	"",
	"Powersave",
	"Battery",
	"Balanced",
	"Performance",
	};

	static void radeon_print_power_mode_info(struct radeon_device *rdev)
	{
	int i, j;
	bool is_default;

	DRM_INFO("%d Power State(s)\n", rdev->pm.num_power_states);
	for (i = 0; i < rdev->pm.num_power_states; i++) {
	if (rdev->pm.default_power_state_index == i)
	is_default = true;
	else
	is_default = false;
	DRM_INFO("State %d %s %s\n", i,
	pm_state_types[rdev->pm.power_state[i].type],
	is_default ? "(default)" : "");
	if ((rdev->flags & RADEON_IS_PCIE) && !(rdev->flags & RADEON_IS_IGP))
	DRM_INFO("\t%d PCIE Lanes\n", rdev->pm.power_state[i].pcie_lanes);
	if (rdev->pm.power_state[i].flags & RADEON_PM_STATE_SINGLE_DISPLAY_ONLY)
	DRM_INFO("\tSingle display only\n");
	DRM_INFO("\t%d Clock Mode(s)\n", rdev->pm.power_state[i].num_clock_modes);
	for (j = 0; j < rdev->pm.power_state[i].num_clock_modes; j++) {
	if (rdev->flags & RADEON_IS_IGP)
	DRM_INFO("\t\t%d engine: %d\n",
	j,
	rdev->pm.power_state[i].clock_info[j].sclk * 10);
	else
	DRM_INFO("\t\t%d engine/memory: %d/%d\n",
	j,
	rdev->pm.power_state[i].clock_info[j].sclk * 10,
	rdev->pm.power_state[i].clock_info[j].mclk * 10);
	if (rdev->pm.power_state[i].clock_info[j].flags & RADEON_PM_MODE_NO_DISPLAY)
	DRM_INFO("\t\tNo display only\n");
	}
	}
	}

	void radeon_sync_with_vblank(struct radeon_device *rdev)
	{
	if (rdev->pm.active_crtcs) {
	rdev->pm.vblank_sync = false;
	wait_event_timeout(
	rdev->irq.vblank_queue, rdev->pm.vblank_sync,
	msecs_to_jiffies(RADEON_WAIT_VBLANK_TIMEOUT));
	}
	}

	int radeon_pm_init(struct radeon_device *rdev)
	{
	rdev->pm.state = PM_STATE_DISABLED;
	rdev->pm.planned_action = PM_ACTION_NONE;
	rdev->pm.can_upclock = true;
	rdev->pm.can_downclock = true;

	if (rdev->bios) {
	if (rdev->is_atom_bios)
	radeon_atombios_get_power_modes(rdev);
	else
	radeon_combios_get_power_modes(rdev);
	radeon_print_power_mode_info(rdev);
	}

	if (radeon_debugfs_pm_init(rdev)) {
	DRM_ERROR("Failed to register debugfs file for PM!\n");
	}

	/* where's the best place to put this? */
	device_create_file(rdev->dev, &dev_attr_power_state);
	device_create_file(rdev->dev, &dev_attr_dynpm);

	INIT_DELAYED_WORK(&rdev->pm.idle_work, radeon_pm_idle_work_handler);

	if ((radeon_dynpm != -1 && radeon_dynpm) && (rdev->pm.num_power_states > 1)) {
	rdev->pm.state = PM_STATE_PAUSED;
	DRM_INFO("radeon: dynamic power management enabled\n");
	}

	DRM_INFO("radeon: power management initialized\n");

	return 0;
	}

	void radeon_pm_fini(struct radeon_device *rdev)
	{
	if (rdev->pm.state != PM_STATE_DISABLED) {
	/* cancel work */
	cancel_delayed_work_sync(&rdev->pm.idle_work);
	/* reset default clocks */
	rdev->pm.state = PM_STATE_DISABLED;
	rdev->pm.planned_action = PM_ACTION_DEFAULT;
	radeon_pm_set_clocks(rdev, true);
	} else if ((rdev->pm.current_power_state_index !=
	rdev->pm.default_power_state_index) \|\|
	(rdev->pm.current_clock_mode_index != 0)) {
	rdev->pm.requested_power_state_index = rdev->pm.default_power_state_index;
	rdev->pm.requested_clock_mode_index = 0;
	mutex_lock(&rdev->pm.mutex);
	radeon_pm_set_clocks(rdev, true);
	mutex_unlock(&rdev->pm.mutex);
	}

	device_remove_file(rdev->dev, &dev_attr_power_state);
	device_remove_file(rdev->dev, &dev_attr_dynpm);

	if (rdev->pm.i2c_bus)
	radeon_i2c_destroy(rdev->pm.i2c_bus);
	}

	void radeon_pm_compute_clocks(struct radeon_device *rdev)
	{
	struct drm_device *ddev = rdev->ddev;
	struct drm_crtc *crtc;
	struct radeon_crtc *radeon_crtc;

	mutex_lock(&rdev->pm.mutex);

	rdev->pm.active_crtcs = 0;
	rdev->pm.active_crtc_count = 0;
	list_for_each_entry(crtc,
	&ddev->mode_config.crtc_list, head) {
	radeon_crtc = to_radeon_crtc(crtc);
	if (radeon_crtc->enabled) {
	rdev->pm.active_crtcs \|= (1 << radeon_crtc->crtc_id);
	rdev->pm.active_crtc_count++;
	}
	}

	if (rdev->pm.state == PM_STATE_DISABLED) {
	mutex_unlock(&rdev->pm.mutex);
	return;
	}

	/* Note, radeon_pm_set_clocks is called with static_switch set
	* to true since we always want to statically set the clocks,
	* not wait for vbl.
	*/
	if (rdev->pm.active_crtc_count > 1) {
	if (rdev->pm.state == PM_STATE_ACTIVE) {
	cancel_delayed_work(&rdev->pm.idle_work);

	rdev->pm.state = PM_STATE_PAUSED;
	rdev->pm.planned_action = PM_ACTION_DEFAULT;
	radeon_pm_set_clocks(rdev, true);

	DRM_DEBUG("radeon: dynamic power management deactivated\n");
	}
	} else if (rdev->pm.active_crtc_count == 1) {
	/* TODO: Increase clocks if needed for current mode */

	if (rdev->pm.state == PM_STATE_MINIMUM) {
	rdev->pm.state = PM_STATE_ACTIVE;
	rdev->pm.planned_action = PM_ACTION_UPCLOCK;
	radeon_pm_set_clocks(rdev, true);

	queue_delayed_work(rdev->wq, &rdev->pm.idle_work,
	msecs_to_jiffies(RADEON_IDLE_LOOP_MS));
	} else if (rdev->pm.state == PM_STATE_PAUSED) {
	rdev->pm.state = PM_STATE_ACTIVE;
	queue_delayed_work(rdev->wq, &rdev->pm.idle_work,
	msecs_to_jiffies(RADEON_IDLE_LOOP_MS));
	DRM_DEBUG("radeon: dynamic power management activated\n");
	}
	} else { /* count == 0 */
	if (rdev->pm.state != PM_STATE_MINIMUM) {
	cancel_delayed_work(&rdev->pm.idle_work);

	rdev->pm.state = PM_STATE_MINIMUM;
	rdev->pm.planned_action = PM_ACTION_MINIMUM;
	radeon_pm_set_clocks(rdev, true);
	}
	}

	mutex_unlock(&rdev->pm.mutex);
	}

	bool radeon_pm_in_vbl(struct radeon_device *rdev)
	{
	u32 stat_crtc = 0, vbl = 0, position = 0;
	bool in_vbl = true;

	if (ASIC_IS_DCE4(rdev)) {
	if (rdev->pm.active_crtcs & (1 << 0)) {
	vbl = RREG32(EVERGREEN_CRTC_V_BLANK_START_END +
	EVERGREEN_CRTC0_REGISTER_OFFSET) & 0xfff;
	position = RREG32(EVERGREEN_CRTC_STATUS_POSITION +
	EVERGREEN_CRTC0_REGISTER_OFFSET) & 0xfff;
	}
	if (rdev->pm.active_crtcs & (1 << 1)) {
	vbl = RREG32(EVERGREEN_CRTC_V_BLANK_START_END +
	EVERGREEN_CRTC1_REGISTER_OFFSET) & 0xfff;
	position = RREG32(EVERGREEN_CRTC_STATUS_POSITION +
	EVERGREEN_CRTC1_REGISTER_OFFSET) & 0xfff;
	}
	if (rdev->pm.active_crtcs & (1 << 2)) {
	vbl = RREG32(EVERGREEN_CRTC_V_BLANK_START_END +
	EVERGREEN_CRTC2_REGISTER_OFFSET) & 0xfff;
	position = RREG32(EVERGREEN_CRTC_STATUS_POSITION +
	EVERGREEN_CRTC2_REGISTER_OFFSET) & 0xfff;
	}
	if (rdev->pm.active_crtcs & (1 << 3)) {
	vbl = RREG32(EVERGREEN_CRTC_V_BLANK_START_END +
	EVERGREEN_CRTC3_REGISTER_OFFSET) & 0xfff;
	position = RREG32(EVERGREEN_CRTC_STATUS_POSITION +
	EVERGREEN_CRTC3_REGISTER_OFFSET) & 0xfff;
	}
	if (rdev->pm.active_crtcs & (1 << 4)) {
	vbl = RREG32(EVERGREEN_CRTC_V_BLANK_START_END +
	EVERGREEN_CRTC4_REGISTER_OFFSET) & 0xfff;
	position = RREG32(EVERGREEN_CRTC_STATUS_POSITION +
	EVERGREEN_CRTC4_REGISTER_OFFSET) & 0xfff;
	}
	if (rdev->pm.active_crtcs & (1 << 5)) {
	vbl = RREG32(EVERGREEN_CRTC_V_BLANK_START_END +
	EVERGREEN_CRTC5_REGISTER_OFFSET) & 0xfff;
	position = RREG32(EVERGREEN_CRTC_STATUS_POSITION +
	EVERGREEN_CRTC5_REGISTER_OFFSET) & 0xfff;
	}
	} else if (ASIC_IS_AVIVO(rdev)) {
	if (rdev->pm.active_crtcs & (1 << 0)) {
	vbl = RREG32(AVIVO_D1CRTC_V_BLANK_START_END) & 0xfff;
	position = RREG32(AVIVO_D1CRTC_STATUS_POSITION) & 0xfff;
	}
	if (rdev->pm.active_crtcs & (1 << 1)) {
	vbl = RREG32(AVIVO_D2CRTC_V_BLANK_START_END) & 0xfff;
	position = RREG32(AVIVO_D2CRTC_STATUS_POSITION) & 0xfff;
	}
	if (position < vbl && position > 1)
	in_vbl = false;
	} else {
	if (rdev->pm.active_crtcs & (1 << 0)) {
	stat_crtc = RREG32(RADEON_CRTC_STATUS);
	if (!(stat_crtc & 1))
	in_vbl = false;
	}
	if (rdev->pm.active_crtcs & (1 << 1)) {
	stat_crtc = RREG32(RADEON_CRTC2_STATUS);
	if (!(stat_crtc & 1))
	in_vbl = false;
	}
	}

	if (position < vbl && position > 1)
	in_vbl = false;

	return in_vbl;
	}

	bool radeon_pm_debug_check_in_vbl(struct radeon_device *rdev, bool finish)
	{
	u32 stat_crtc = 0;
	bool in_vbl = radeon_pm_in_vbl(rdev);

	if (in_vbl == false)
	DRM_INFO("not in vbl for pm change %08x at %s\n", stat_crtc,
	finish ? "exit" : "entry");
	return in_vbl;
	}

	static void radeon_pm_idle_work_handler(struct work_struct *work)
	{
	struct radeon_device *rdev;
	int resched;
	rdev = container_of(work, struct radeon_device,
	pm.idle_work.work);

	resched = ttm_bo_lock_delayed_workqueue(&rdev->mman.bdev);
	mutex_lock(&rdev->pm.mutex);
	if (rdev->pm.state == PM_STATE_ACTIVE) {
	unsigned long irq_flags;
	int not_processed = 0;

	read_lock_irqsave(&rdev->fence_drv.lock, irq_flags);
	if (!list_empty(&rdev->fence_drv.emited)) {
	struct list_head *ptr;
	list_for_each(ptr, &rdev->fence_drv.emited) {
	/* count up to 3, that's enought info */
	if (++not_processed >= 3)
	break;
	}
	}
	read_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);

	if (not_processed >= 3) { /* should upclock */
	if (rdev->pm.planned_action == PM_ACTION_DOWNCLOCK) {
	rdev->pm.planned_action = PM_ACTION_NONE;
	} else if (rdev->pm.planned_action == PM_ACTION_NONE &&
	rdev->pm.can_upclock) {
	rdev->pm.planned_action =
	PM_ACTION_UPCLOCK;
	rdev->pm.action_timeout = jiffies +
	msecs_to_jiffies(RADEON_RECLOCK_DELAY_MS);
	}
	} else if (not_processed == 0) { /* should downclock */
	if (rdev->pm.planned_action == PM_ACTION_UPCLOCK) {
	rdev->pm.planned_action = PM_ACTION_NONE;
	} else if (rdev->pm.planned_action == PM_ACTION_NONE &&
	rdev->pm.can_downclock) {
	rdev->pm.planned_action =
	PM_ACTION_DOWNCLOCK;
	rdev->pm.action_timeout = jiffies +
	msecs_to_jiffies(RADEON_RECLOCK_DELAY_MS);
	}
	}

	/* Note, radeon_pm_set_clocks is called with static_switch set
	* to false since we want to wait for vbl to avoid flicker.
	*/
	if (rdev->pm.planned_action != PM_ACTION_NONE &&
	jiffies > rdev->pm.action_timeout) {
	radeon_pm_set_clocks(rdev, false);
	}
	}
	mutex_unlock(&rdev->pm.mutex);
	ttm_bo_unlock_delayed_workqueue(&rdev->mman.bdev, resched);

	queue_delayed_work(rdev->wq, &rdev->pm.idle_work,
	msecs_to_jiffies(RADEON_IDLE_LOOP_MS));
	}

	/*
	* Debugfs info
	*/
	#if defined(CONFIG_DEBUG_FS)

	static int radeon_debugfs_pm_info(struct seq_file m, void data)
	{
	struct drm_info_node node = (struct drm_info_node ) m->private;
	struct drm_device *dev = node->minor->dev;
	struct radeon_device *rdev = dev->dev_private;

	seq_printf(m, "state: %s\n", pm_state_names[rdev->pm.state]);
	seq_printf(m, "default engine clock: %u0 kHz\n", rdev->clock.default_sclk);
	seq_printf(m, "current engine clock: %u0 kHz\n", radeon_get_engine_clock(rdev));
	seq_printf(m, "default memory clock: %u0 kHz\n", rdev->clock.default_mclk);
	if (rdev->asic->get_memory_clock)
	seq_printf(m, "current memory clock: %u0 kHz\n", radeon_get_memory_clock(rdev));
	if (rdev->asic->get_pcie_lanes)
	seq_printf(m, "PCIE lanes: %d\n", radeon_get_pcie_lanes(rdev));

	return 0;
	}

	static struct drm_info_list radeon_pm_info_list[] = {
	{"radeon_pm_info", radeon_debugfs_pm_info, 0, NULL},
	};
	#endif

	static int radeon_debugfs_pm_init(struct radeon_device *rdev)
	{
	#if defined(CONFIG_DEBUG_FS)
	return radeon_debugfs_add_files(rdev, radeon_pm_info_list, ARRAY_SIZE(radeon_pm_info_list));
	#else
	return 0;
	#endif
	}