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>
30 #include "psb_powermgmt.h"
33 #include "psb_intel_reg.h"
34 #include <linux/mutex.h>
35 #include <linux/pm_runtime.h>
37 static struct mutex power_mutex;
40 * gma_power_init - initialise power manager
43 * Set up for power management tracking of our hardware.
45 void gma_power_init(struct drm_device *dev)
47 struct drm_psb_private *dev_priv = dev->dev_private;
49 /* FIXME: need to sort out fetching apm_reg for both platforms ?? */
51 dev_priv->apm_base = dev_priv->apm_reg & 0xffff;
52 dev_priv->ospm_base &= 0xffff;
54 dev_priv->display_power = true; /* We start active */
55 dev_priv->display_count = 0; /* Currently no users */
56 dev_priv->suspended = false; /* And not suspended */
57 mutex_init(&power_mutex);
59 dev_priv->ops->init_pm(dev);
63 * gma_power_uninit - end power manager
64 * @dev: device to end for
66 * Undo the effects of gma_power_init
68 void gma_power_uninit(struct drm_device *dev)
70 mutex_destroy(&power_mutex);
71 pm_runtime_disable(&dev->pdev->dev);
72 pm_runtime_set_suspended(&dev->pdev->dev);
79 * gma_suspend_display - suspend the display logic
80 * @dev: our DRM device
82 * Suspend the display logic of the graphics interface
84 * FIXME: This ought to be replaced by a dev_priv-> ops interface
85 * where the various platforms register their save/restore methods
86 * and keep them in their own support files.
88 static void gma_suspend_display(struct drm_device *dev)
90 struct drm_psb_private *dev_priv = dev->dev_private;
92 if (dev_priv->suspended)
94 dev_priv->ops->save_regs(dev);
95 dev_priv->ops->power_down(dev);
96 dev_priv->display_power = false;
100 * gma_resume_display - resume display side logic
102 * Resume the display hardware restoring state and enabling
105 static void gma_resume_display(struct pci_dev *pdev)
107 struct drm_device *dev = pci_get_drvdata(pdev);
108 struct drm_psb_private *dev_priv = dev->dev_private;
110 if (dev_priv->suspended == false)
113 /* turn on the display power island */
114 dev_priv->ops->power_up(dev);
115 dev_priv->suspended = false;
116 dev_priv->display_power = true;
118 PSB_WVDC32(dev_priv->pge_ctl | _PSB_PGETBL_ENABLED, PSB_PGETBL_CTL);
119 pci_write_config_word(pdev, PSB_GMCH_CTRL,
120 dev_priv->gmch_ctrl | _PSB_GMCH_ENABLED);
121 dev_priv->ops->restore_regs(dev);
125 * gma_suspend_pci - suspend PCI side
128 * Perform the suspend processing on our PCI device state
130 static void gma_suspend_pci(struct pci_dev *pdev)
132 struct drm_device *dev = pci_get_drvdata(pdev);
133 struct drm_psb_private *dev_priv = dev->dev_private;
136 if (dev_priv->suspended)
139 pci_save_state(pdev);
140 pci_read_config_dword(pdev, 0x5C, &bsm);
141 dev_priv->saveBSM = bsm;
142 pci_read_config_dword(pdev, 0xFC, &vbt);
143 dev_priv->saveVBT = vbt;
144 pci_read_config_dword(pdev, PSB_PCIx_MSI_ADDR_LOC, &dev_priv->msi_addr);
145 pci_read_config_dword(pdev, PSB_PCIx_MSI_DATA_LOC, &dev_priv->msi_data);
147 pci_disable_device(pdev);
148 pci_set_power_state(pdev, PCI_D3hot);
150 dev_priv->suspended = true;
154 * gma_resume_pci - resume helper
155 * @dev: our PCI device
157 * Perform the resume processing on our PCI device state - rewrite
158 * register state and re-enable the PCI device
160 static bool gma_resume_pci(struct pci_dev *pdev)
162 struct drm_device *dev = pci_get_drvdata(pdev);
163 struct drm_psb_private *dev_priv = dev->dev_private;
166 if (!dev_priv->suspended)
169 pci_set_power_state(pdev, PCI_D0);
170 pci_restore_state(pdev);
171 pci_write_config_dword(pdev, 0x5c, dev_priv->saveBSM);
172 pci_write_config_dword(pdev, 0xFC, dev_priv->saveVBT);
173 /* restoring MSI address and data in PCIx space */
174 pci_write_config_dword(pdev, PSB_PCIx_MSI_ADDR_LOC, dev_priv->msi_addr);
175 pci_write_config_dword(pdev, PSB_PCIx_MSI_DATA_LOC, dev_priv->msi_data);
176 ret = pci_enable_device(pdev);
179 dev_err(&pdev->dev, "pci_enable failed: %d\n", ret);
181 dev_priv->suspended = false;
182 return !dev_priv->suspended;
186 * gma_power_suspend - bus callback for suspend
187 * @pdev: our PCI device
188 * @state: suspend type
190 * Called back by the PCI layer during a suspend of the system. We
191 * perform the necessary shut down steps and save enough state that
192 * we can undo this when resume is called.
194 int gma_power_suspend(struct pci_dev *pdev, pm_message_t state)
196 struct drm_device *dev = pci_get_drvdata(pdev);
197 struct drm_psb_private *dev_priv = dev->dev_private;
199 mutex_lock(&power_mutex);
200 if (!dev_priv->suspended) {
201 if (dev_priv->display_count) {
202 mutex_unlock(&power_mutex);
205 psb_irq_uninstall(dev);
206 gma_suspend_display(dev);
207 gma_suspend_pci(pdev);
209 mutex_unlock(&power_mutex);
215 * gma_power_resume - resume power
218 * Resume the PCI side of the graphics and then the displays
220 int gma_power_resume(struct pci_dev *pdev)
222 struct drm_device *dev = pci_get_drvdata(pdev);
224 mutex_lock(&power_mutex);
225 gma_resume_pci(pdev);
226 gma_resume_display(pdev);
227 psb_irq_preinstall(dev);
228 psb_irq_postinstall(dev);
229 mutex_unlock(&power_mutex);
236 * gma_power_is_on - returne true if power is on
237 * @dev: our DRM device
239 * Returns true if the display island power is on at this moment
241 bool gma_power_is_on(struct drm_device *dev)
243 struct drm_psb_private *dev_priv = dev->dev_private;
244 return dev_priv->display_power;
249 * gma_power_begin - begin requiring power
250 * @dev: our DRM device
251 * @force_on: true to force power on
253 * Begin an action that requires the display power island is enabled.
254 * We refcount the islands.
258 bool gma_power_begin(struct drm_device *dev, bool force_on)
260 struct drm_psb_private *dev_priv = dev->dev_private;
263 /* Power already on ? */
264 if (dev_priv->display_power) {
265 dev_priv->display_count++;
266 pm_runtime_get(&dev->pdev->dev);
269 if (force_on == false)
272 /* Ok power up needed */
273 ret = gma_resume_pci(dev->pdev);
275 psb_irq_preinstall(dev);
276 psb_irq_postinstall(dev);
277 pm_runtime_get(&dev->pdev->dev);
278 dev_priv->display_count++;
286 * gma_power_end - end use of power
287 * @dev: Our DRM device
289 * Indicate that one of our gma_power_begin() requested periods when
290 * the diplay island power is needed has completed.
292 void gma_power_end(struct drm_device *dev)
294 struct drm_psb_private *dev_priv = dev->dev_private;
295 dev_priv->display_count--;
296 WARN_ON(dev_priv->display_count < 0);
297 pm_runtime_put(&dev->pdev->dev);
300 int psb_runtime_suspend(struct device *dev)
302 static pm_message_t dummy;
303 return gma_power_suspend(to_pci_dev(dev), dummy);
306 int psb_runtime_resume(struct device *dev)
311 int psb_runtime_idle(struct device *dev)
313 struct drm_device *drmdev = pci_get_drvdata(to_pci_dev(dev));
314 struct drm_psb_private *dev_priv = drmdev->dev_private;
315 if (dev_priv->display_count)