1 /**************************************************************************
2 * Copyright (c) 2009-2011, Intel Corporation.
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice (including the next
13 * paragraph) shall be included in all copies or substantial portions of the
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
25 * Benjamin Defnet <benjamin.r.defnet@intel.com>
26 * Rajesh Poornachandran <rajesh.poornachandran@intel.com>
28 * Alan Cox <alan@linux.intel.com>
35 #include "psb_intel_reg.h"
37 #include <linux/mutex.h>
38 #include <linux/pm_runtime.h>
40 static struct mutex power_mutex; /* Serialize power ops */
41 static DEFINE_SPINLOCK(power_ctrl_lock); /* Serialize power claim */
44 * gma_power_init - initialise power manager
47 * Set up for power management tracking of our hardware.
49 void gma_power_init(struct drm_device *dev)
51 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
53 /* FIXME: Move APM/OSPM base into relevant device code */
54 dev_priv->apm_base = dev_priv->apm_reg & 0xffff;
55 dev_priv->ospm_base &= 0xffff;
57 dev_priv->display_power = true; /* We start active */
58 dev_priv->display_count = 0; /* Currently no users */
59 dev_priv->suspended = false; /* And not suspended */
60 mutex_init(&power_mutex);
62 if (dev_priv->ops->init_pm)
63 dev_priv->ops->init_pm(dev);
67 * gma_power_uninit - end power manager
68 * @dev: device to end for
70 * Undo the effects of gma_power_init
72 void gma_power_uninit(struct drm_device *dev)
74 pm_runtime_disable(dev->dev);
75 pm_runtime_set_suspended(dev->dev);
79 * gma_suspend_display - suspend the display logic
80 * @dev: our DRM device
82 * Suspend the display logic of the graphics interface
84 static void gma_suspend_display(struct drm_device *dev)
86 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
88 if (dev_priv->suspended)
90 dev_priv->ops->save_regs(dev);
91 dev_priv->ops->power_down(dev);
92 dev_priv->display_power = false;
96 * gma_resume_display - resume display side logic
99 * Resume the display hardware restoring state and enabling
102 static void gma_resume_display(struct pci_dev *pdev)
104 struct drm_device *dev = pci_get_drvdata(pdev);
105 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
107 /* turn on the display power island */
108 dev_priv->ops->power_up(dev);
109 dev_priv->suspended = false;
110 dev_priv->display_power = true;
112 PSB_WVDC32(dev_priv->pge_ctl | _PSB_PGETBL_ENABLED, PSB_PGETBL_CTL);
113 pci_write_config_word(pdev, PSB_GMCH_CTRL,
114 dev_priv->gmch_ctrl | _PSB_GMCH_ENABLED);
116 /* Rebuild our GTT mappings */
118 psb_gem_mm_resume(dev);
119 dev_priv->ops->restore_regs(dev);
123 * gma_suspend_pci - suspend PCI side
126 * Perform the suspend processing on our PCI device state
128 static void gma_suspend_pci(struct pci_dev *pdev)
130 struct drm_device *dev = pci_get_drvdata(pdev);
131 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
134 if (dev_priv->suspended)
137 pci_save_state(pdev);
138 pci_read_config_dword(pdev, 0x5C, &bsm);
139 dev_priv->regs.saveBSM = bsm;
140 pci_read_config_dword(pdev, 0xFC, &vbt);
141 dev_priv->regs.saveVBT = vbt;
143 pci_disable_device(pdev);
144 pci_set_power_state(pdev, PCI_D3hot);
146 dev_priv->suspended = true;
150 * gma_resume_pci - resume helper
151 * @pdev: our PCI device
153 * Perform the resume processing on our PCI device state - rewrite
154 * register state and re-enable the PCI device
156 static bool gma_resume_pci(struct pci_dev *pdev)
158 struct drm_device *dev = pci_get_drvdata(pdev);
159 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
162 if (!dev_priv->suspended)
165 pci_set_power_state(pdev, PCI_D0);
166 pci_restore_state(pdev);
167 pci_write_config_dword(pdev, 0x5c, dev_priv->regs.saveBSM);
168 pci_write_config_dword(pdev, 0xFC, dev_priv->regs.saveVBT);
169 ret = pci_enable_device(pdev);
172 dev_err(&pdev->dev, "pci_enable failed: %d\n", ret);
174 dev_priv->suspended = false;
175 return !dev_priv->suspended;
179 * gma_power_suspend - bus callback for suspend
182 * Called back by the PCI layer during a suspend of the system. We
183 * perform the necessary shut down steps and save enough state that
184 * we can undo this when resume is called.
186 int gma_power_suspend(struct device *_dev)
188 struct pci_dev *pdev = to_pci_dev(_dev);
189 struct drm_device *dev = pci_get_drvdata(pdev);
190 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
192 mutex_lock(&power_mutex);
193 if (!dev_priv->suspended) {
194 if (dev_priv->display_count) {
195 mutex_unlock(&power_mutex);
196 dev_err(dev->dev, "GPU hardware busy, cannot suspend\n");
199 gma_irq_uninstall(dev);
200 gma_suspend_display(dev);
201 gma_suspend_pci(pdev);
203 mutex_unlock(&power_mutex);
208 * gma_power_resume - resume power
211 * Resume the PCI side of the graphics and then the displays
213 int gma_power_resume(struct device *_dev)
215 struct pci_dev *pdev = to_pci_dev(_dev);
216 struct drm_device *dev = pci_get_drvdata(pdev);
218 mutex_lock(&power_mutex);
219 gma_resume_pci(pdev);
220 gma_resume_display(pdev);
221 gma_irq_install(dev);
222 mutex_unlock(&power_mutex);
227 * gma_power_is_on - returne true if power is on
228 * @dev: our DRM device
230 * Returns true if the display island power is on at this moment
232 bool gma_power_is_on(struct drm_device *dev)
234 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
235 return dev_priv->display_power;
239 * gma_power_begin - begin requiring power
240 * @dev: our DRM device
241 * @force_on: true to force power on
243 * Begin an action that requires the display power island is enabled.
244 * We refcount the islands.
246 bool gma_power_begin(struct drm_device *dev, bool force_on)
248 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
249 struct pci_dev *pdev = to_pci_dev(dev->dev);
253 spin_lock_irqsave(&power_ctrl_lock, flags);
254 /* Power already on ? */
255 if (dev_priv->display_power) {
256 dev_priv->display_count++;
257 pm_runtime_get(dev->dev);
258 spin_unlock_irqrestore(&power_ctrl_lock, flags);
261 if (force_on == false)
264 /* Ok power up needed */
265 ret = gma_resume_pci(pdev);
267 gma_irq_preinstall(dev);
268 gma_irq_postinstall(dev);
269 pm_runtime_get(dev->dev);
270 dev_priv->display_count++;
271 spin_unlock_irqrestore(&power_ctrl_lock, flags);
275 spin_unlock_irqrestore(&power_ctrl_lock, flags);
280 * gma_power_end - end use of power
281 * @dev: Our DRM device
283 * Indicate that one of our gma_power_begin() requested periods when
284 * the diplay island power is needed has completed.
286 void gma_power_end(struct drm_device *dev)
288 struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
290 spin_lock_irqsave(&power_ctrl_lock, flags);
291 dev_priv->display_count--;
292 WARN_ON(dev_priv->display_count < 0);
293 spin_unlock_irqrestore(&power_ctrl_lock, flags);
294 pm_runtime_put(dev->dev);
297 int psb_runtime_suspend(struct device *dev)
299 return gma_power_suspend(dev);
302 int psb_runtime_resume(struct device *dev)
304 return gma_power_resume(dev);
307 int psb_runtime_idle(struct device *dev)
309 struct drm_device *drmdev = pci_get_drvdata(to_pci_dev(dev));
310 struct drm_psb_private *dev_priv = to_drm_psb_private(drmdev);
311 if (dev_priv->display_count)
317 int gma_power_thaw(struct device *_dev)
319 return gma_power_resume(_dev);
322 int gma_power_freeze(struct device *_dev)
324 return gma_power_suspend(_dev);
327 int gma_power_restore(struct device *_dev)
329 return gma_power_resume(_dev);