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>
34 #include "psb_intel_reg.h"
36 #include <linux/mutex.h>
37 #include <linux/pm_runtime.h>
39 static struct mutex power_mutex; /* Serialize power ops */
40 static DEFINE_SPINLOCK(power_ctrl_lock); /* Serialize power claim */
43 * gma_power_init - initialise power manager
46 * Set up for power management tracking of our hardware.
48 void gma_power_init(struct drm_device *dev)
50 struct drm_psb_private *dev_priv = dev->dev_private;
52 /* FIXME: Move APM/OSPM base into relevant device code */
53 dev_priv->apm_base = dev_priv->apm_reg & 0xffff;
54 dev_priv->ospm_base &= 0xffff;
56 dev_priv->display_power = true; /* We start active */
57 dev_priv->display_count = 0; /* Currently no users */
58 dev_priv->suspended = false; /* And not suspended */
59 mutex_init(&power_mutex);
61 if (dev_priv->ops->init_pm)
62 dev_priv->ops->init_pm(dev);
66 * gma_power_uninit - end power manager
67 * @dev: device to end for
69 * Undo the effects of gma_power_init
71 void gma_power_uninit(struct drm_device *dev)
73 pm_runtime_disable(dev->dev);
74 pm_runtime_set_suspended(dev->dev);
78 * gma_suspend_display - suspend the display logic
79 * @dev: our DRM device
81 * Suspend the display logic of the graphics interface
83 static void gma_suspend_display(struct drm_device *dev)
85 struct drm_psb_private *dev_priv = dev->dev_private;
87 if (dev_priv->suspended)
89 dev_priv->ops->save_regs(dev);
90 dev_priv->ops->power_down(dev);
91 dev_priv->display_power = false;
95 * gma_resume_display - resume display side logic
98 * Resume the display hardware restoring state and enabling
101 static void gma_resume_display(struct pci_dev *pdev)
103 struct drm_device *dev = pci_get_drvdata(pdev);
104 struct drm_psb_private *dev_priv = dev->dev_private;
106 /* turn on the display power island */
107 dev_priv->ops->power_up(dev);
108 dev_priv->suspended = false;
109 dev_priv->display_power = true;
111 PSB_WVDC32(dev_priv->pge_ctl | _PSB_PGETBL_ENABLED, PSB_PGETBL_CTL);
112 pci_write_config_word(pdev, PSB_GMCH_CTRL,
113 dev_priv->gmch_ctrl | _PSB_GMCH_ENABLED);
115 psb_gtt_restore(dev); /* Rebuild our GTT mappings */
116 dev_priv->ops->restore_regs(dev);
120 * gma_suspend_pci - suspend PCI side
123 * Perform the suspend processing on our PCI device state
125 static void gma_suspend_pci(struct pci_dev *pdev)
127 struct drm_device *dev = pci_get_drvdata(pdev);
128 struct drm_psb_private *dev_priv = dev->dev_private;
131 if (dev_priv->suspended)
134 pci_save_state(pdev);
135 pci_read_config_dword(pdev, 0x5C, &bsm);
136 dev_priv->regs.saveBSM = bsm;
137 pci_read_config_dword(pdev, 0xFC, &vbt);
138 dev_priv->regs.saveVBT = vbt;
139 pci_read_config_dword(pdev, PSB_PCIx_MSI_ADDR_LOC, &dev_priv->msi_addr);
140 pci_read_config_dword(pdev, PSB_PCIx_MSI_DATA_LOC, &dev_priv->msi_data);
142 pci_disable_device(pdev);
143 pci_set_power_state(pdev, PCI_D3hot);
145 dev_priv->suspended = true;
149 * gma_resume_pci - resume helper
150 * @pdev: our PCI device
152 * Perform the resume processing on our PCI device state - rewrite
153 * register state and re-enable the PCI device
155 static bool gma_resume_pci(struct pci_dev *pdev)
157 struct drm_device *dev = pci_get_drvdata(pdev);
158 struct drm_psb_private *dev_priv = dev->dev_private;
161 if (!dev_priv->suspended)
164 pci_set_power_state(pdev, PCI_D0);
165 pci_restore_state(pdev);
166 pci_write_config_dword(pdev, 0x5c, dev_priv->regs.saveBSM);
167 pci_write_config_dword(pdev, 0xFC, dev_priv->regs.saveVBT);
168 /* restoring MSI address and data in PCIx space */
169 pci_write_config_dword(pdev, PSB_PCIx_MSI_ADDR_LOC, dev_priv->msi_addr);
170 pci_write_config_dword(pdev, PSB_PCIx_MSI_DATA_LOC, dev_priv->msi_data);
171 ret = pci_enable_device(pdev);
174 dev_err(&pdev->dev, "pci_enable failed: %d\n", ret);
176 dev_priv->suspended = false;
177 return !dev_priv->suspended;
181 * gma_power_suspend - bus callback for suspend
184 * Called back by the PCI layer during a suspend of the system. We
185 * perform the necessary shut down steps and save enough state that
186 * we can undo this when resume is called.
188 int gma_power_suspend(struct device *_dev)
190 struct pci_dev *pdev = to_pci_dev(_dev);
191 struct drm_device *dev = pci_get_drvdata(pdev);
192 struct drm_psb_private *dev_priv = dev->dev_private;
194 mutex_lock(&power_mutex);
195 if (!dev_priv->suspended) {
196 if (dev_priv->display_count) {
197 mutex_unlock(&power_mutex);
198 dev_err(dev->dev, "GPU hardware busy, cannot suspend\n");
201 psb_irq_uninstall(dev);
202 gma_suspend_display(dev);
203 gma_suspend_pci(pdev);
205 mutex_unlock(&power_mutex);
210 * gma_power_resume - resume power
213 * Resume the PCI side of the graphics and then the displays
215 int gma_power_resume(struct device *_dev)
217 struct pci_dev *pdev = to_pci_dev(_dev);
218 struct drm_device *dev = pci_get_drvdata(pdev);
220 mutex_lock(&power_mutex);
221 gma_resume_pci(pdev);
222 gma_resume_display(pdev);
223 psb_irq_preinstall(dev);
224 psb_irq_postinstall(dev);
225 mutex_unlock(&power_mutex);
230 * gma_power_is_on - returne true if power is on
231 * @dev: our DRM device
233 * Returns true if the display island power is on at this moment
235 bool gma_power_is_on(struct drm_device *dev)
237 struct drm_psb_private *dev_priv = dev->dev_private;
238 return dev_priv->display_power;
242 * gma_power_begin - begin requiring power
243 * @dev: our DRM device
244 * @force_on: true to force power on
246 * Begin an action that requires the display power island is enabled.
247 * We refcount the islands.
249 bool gma_power_begin(struct drm_device *dev, bool force_on)
251 struct drm_psb_private *dev_priv = dev->dev_private;
252 struct pci_dev *pdev = to_pci_dev(dev->dev);
256 spin_lock_irqsave(&power_ctrl_lock, flags);
257 /* Power already on ? */
258 if (dev_priv->display_power) {
259 dev_priv->display_count++;
260 pm_runtime_get(dev->dev);
261 spin_unlock_irqrestore(&power_ctrl_lock, flags);
264 if (force_on == false)
267 /* Ok power up needed */
268 ret = gma_resume_pci(pdev);
270 psb_irq_preinstall(dev);
271 psb_irq_postinstall(dev);
272 pm_runtime_get(dev->dev);
273 dev_priv->display_count++;
274 spin_unlock_irqrestore(&power_ctrl_lock, flags);
278 spin_unlock_irqrestore(&power_ctrl_lock, flags);
283 * gma_power_end - end use of power
284 * @dev: Our DRM device
286 * Indicate that one of our gma_power_begin() requested periods when
287 * the diplay island power is needed has completed.
289 void gma_power_end(struct drm_device *dev)
291 struct drm_psb_private *dev_priv = dev->dev_private;
293 spin_lock_irqsave(&power_ctrl_lock, flags);
294 dev_priv->display_count--;
295 WARN_ON(dev_priv->display_count < 0);
296 spin_unlock_irqrestore(&power_ctrl_lock, flags);
297 pm_runtime_put(dev->dev);
300 int psb_runtime_suspend(struct device *dev)
302 return gma_power_suspend(dev);
305 int psb_runtime_resume(struct device *dev)
307 return gma_power_resume(dev);
310 int psb_runtime_idle(struct device *dev)
312 struct drm_device *drmdev = pci_get_drvdata(to_pci_dev(dev));
313 struct drm_psb_private *dev_priv = drmdev->dev_private;
314 if (dev_priv->display_count)
320 int gma_power_thaw(struct device *_dev)
322 return gma_power_resume(_dev);
325 int gma_power_freeze(struct device *_dev)
327 return gma_power_suspend(_dev);
330 int gma_power_restore(struct device *_dev)
332 return gma_power_resume(_dev);