1 /************************************************************************** 2 * Copyright (c) 2009-2011, Intel Corporation. 3 * All Rights Reserved. 4 * 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: 11 * 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 14 * Software. 15 * 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 22 * SOFTWARE. 23 * 24 * Authors: 25 * Benjamin Defnet <benjamin.r.defnet@intel.com> 26 * Rajesh Poornachandran <rajesh.poornachandran@intel.com> 27 * Massively reworked 28 * Alan Cox <alan@linux.intel.com> 29 */ 30 31 #include "power.h" 32 #include "psb_drv.h" 33 #include "psb_reg.h" 34 #include "psb_intel_reg.h" 35 #include <linux/mutex.h> 36 #include <linux/pm_runtime.h> 37 38 static struct mutex power_mutex; /* Serialize power ops */ 39 static spinlock_t power_ctrl_lock; /* Serialize power claim */ 40 41 /** 42 * gma_power_init - initialise power manager 43 * @dev: our device 44 * 45 * Set up for power management tracking of our hardware. 46 */ 47 void gma_power_init(struct drm_device *dev) 48 { 49 struct drm_psb_private *dev_priv = dev->dev_private; 50 51 /* FIXME: Move APM/OSPM base into relevant device code */ 52 dev_priv->apm_base = dev_priv->apm_reg & 0xffff; 53 dev_priv->ospm_base &= 0xffff; 54 55 dev_priv->display_power = true; /* We start active */ 56 dev_priv->display_count = 0; /* Currently no users */ 57 dev_priv->suspended = false; /* And not suspended */ 58 spin_lock_init(&power_ctrl_lock); 59 mutex_init(&power_mutex); 60 61 if (dev_priv->ops->init_pm) 62 dev_priv->ops->init_pm(dev); 63 } 64 65 /** 66 * gma_power_uninit - end power manager 67 * @dev: device to end for 68 * 69 * Undo the effects of gma_power_init 70 */ 71 void gma_power_uninit(struct drm_device *dev) 72 { 73 pm_runtime_disable(&dev->pdev->dev); 74 pm_runtime_set_suspended(&dev->pdev->dev); 75 } 76 77 /** 78 * gma_suspend_display - suspend the display logic 79 * @dev: our DRM device 80 * 81 * Suspend the display logic of the graphics interface 82 */ 83 static void gma_suspend_display(struct drm_device *dev) 84 { 85 struct drm_psb_private *dev_priv = dev->dev_private; 86 87 if (dev_priv->suspended) 88 return; 89 dev_priv->ops->save_regs(dev); 90 dev_priv->ops->power_down(dev); 91 dev_priv->display_power = false; 92 } 93 94 /** 95 * gma_resume_display - resume display side logic 96 * 97 * Resume the display hardware restoring state and enabling 98 * as necessary. 99 */ 100 static void gma_resume_display(struct pci_dev *pdev) 101 { 102 struct drm_device *dev = pci_get_drvdata(pdev); 103 struct drm_psb_private *dev_priv = dev->dev_private; 104 105 /* turn on the display power island */ 106 dev_priv->ops->power_up(dev); 107 dev_priv->suspended = false; 108 dev_priv->display_power = true; 109 110 PSB_WVDC32(dev_priv->pge_ctl | _PSB_PGETBL_ENABLED, PSB_PGETBL_CTL); 111 pci_write_config_word(pdev, PSB_GMCH_CTRL, 112 dev_priv->gmch_ctrl | _PSB_GMCH_ENABLED); 113 dev_priv->ops->restore_regs(dev); 114 } 115 116 /** 117 * gma_suspend_pci - suspend PCI side 118 * @pdev: PCI device 119 * 120 * Perform the suspend processing on our PCI device state 121 */ 122 static void gma_suspend_pci(struct pci_dev *pdev) 123 { 124 struct drm_device *dev = pci_get_drvdata(pdev); 125 struct drm_psb_private *dev_priv = dev->dev_private; 126 int bsm, vbt; 127 128 if (dev_priv->suspended) 129 return; 130 131 pci_save_state(pdev); 132 pci_read_config_dword(pdev, 0x5C, &bsm); 133 dev_priv->regs.saveBSM = bsm; 134 pci_read_config_dword(pdev, 0xFC, &vbt); 135 dev_priv->regs.saveVBT = vbt; 136 pci_read_config_dword(pdev, PSB_PCIx_MSI_ADDR_LOC, &dev_priv->msi_addr); 137 pci_read_config_dword(pdev, PSB_PCIx_MSI_DATA_LOC, &dev_priv->msi_data); 138 139 pci_disable_device(pdev); 140 pci_set_power_state(pdev, PCI_D3hot); 141 142 dev_priv->suspended = true; 143 } 144 145 /** 146 * gma_resume_pci - resume helper 147 * @dev: our PCI device 148 * 149 * Perform the resume processing on our PCI device state - rewrite 150 * register state and re-enable the PCI device 151 */ 152 static bool gma_resume_pci(struct pci_dev *pdev) 153 { 154 struct drm_device *dev = pci_get_drvdata(pdev); 155 struct drm_psb_private *dev_priv = dev->dev_private; 156 int ret; 157 158 if (!dev_priv->suspended) 159 return true; 160 161 pci_set_power_state(pdev, PCI_D0); 162 pci_restore_state(pdev); 163 pci_write_config_dword(pdev, 0x5c, dev_priv->regs.saveBSM); 164 pci_write_config_dword(pdev, 0xFC, dev_priv->regs.saveVBT); 165 /* restoring MSI address and data in PCIx space */ 166 pci_write_config_dword(pdev, PSB_PCIx_MSI_ADDR_LOC, dev_priv->msi_addr); 167 pci_write_config_dword(pdev, PSB_PCIx_MSI_DATA_LOC, dev_priv->msi_data); 168 ret = pci_enable_device(pdev); 169 170 if (ret != 0) 171 dev_err(&pdev->dev, "pci_enable failed: %d\n", ret); 172 else 173 dev_priv->suspended = false; 174 return !dev_priv->suspended; 175 } 176 177 /** 178 * gma_power_suspend - bus callback for suspend 179 * @pdev: our PCI device 180 * @state: suspend type 181 * 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. 185 */ 186 int gma_power_suspend(struct device *_dev) 187 { 188 struct pci_dev *pdev = container_of(_dev, struct pci_dev, dev); 189 struct drm_device *dev = pci_get_drvdata(pdev); 190 struct drm_psb_private *dev_priv = dev->dev_private; 191 192 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"); 197 return -EBUSY; 198 } 199 psb_irq_uninstall(dev); 200 gma_suspend_display(dev); 201 gma_suspend_pci(pdev); 202 } 203 mutex_unlock(&power_mutex); 204 return 0; 205 } 206 207 /** 208 * gma_power_resume - resume power 209 * @pdev: PCI device 210 * 211 * Resume the PCI side of the graphics and then the displays 212 */ 213 int gma_power_resume(struct device *_dev) 214 { 215 struct pci_dev *pdev = container_of(_dev, struct pci_dev, dev); 216 struct drm_device *dev = pci_get_drvdata(pdev); 217 218 mutex_lock(&power_mutex); 219 gma_resume_pci(pdev); 220 gma_resume_display(pdev); 221 psb_irq_preinstall(dev); 222 psb_irq_postinstall(dev); 223 mutex_unlock(&power_mutex); 224 return 0; 225 } 226 227 /** 228 * gma_power_is_on - returne true if power is on 229 * @dev: our DRM device 230 * 231 * Returns true if the display island power is on at this moment 232 */ 233 bool gma_power_is_on(struct drm_device *dev) 234 { 235 struct drm_psb_private *dev_priv = dev->dev_private; 236 return dev_priv->display_power; 237 } 238 239 /** 240 * gma_power_begin - begin requiring power 241 * @dev: our DRM device 242 * @force_on: true to force power on 243 * 244 * Begin an action that requires the display power island is enabled. 245 * We refcount the islands. 246 */ 247 bool gma_power_begin(struct drm_device *dev, bool force_on) 248 { 249 struct drm_psb_private *dev_priv = dev->dev_private; 250 int ret; 251 unsigned long flags; 252 253 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->pdev->dev); 258 spin_unlock_irqrestore(&power_ctrl_lock, flags); 259 return true; 260 } 261 if (force_on == false) 262 goto out_false; 263 264 /* Ok power up needed */ 265 ret = gma_resume_pci(dev->pdev); 266 if (ret == 0) { 267 psb_irq_preinstall(dev); 268 psb_irq_postinstall(dev); 269 pm_runtime_get(&dev->pdev->dev); 270 dev_priv->display_count++; 271 spin_unlock_irqrestore(&power_ctrl_lock, flags); 272 return true; 273 } 274 out_false: 275 spin_unlock_irqrestore(&power_ctrl_lock, flags); 276 return false; 277 } 278 279 /** 280 * gma_power_end - end use of power 281 * @dev: Our DRM device 282 * 283 * Indicate that one of our gma_power_begin() requested periods when 284 * the diplay island power is needed has completed. 285 */ 286 void gma_power_end(struct drm_device *dev) 287 { 288 struct drm_psb_private *dev_priv = dev->dev_private; 289 unsigned long flags; 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->pdev->dev); 295 } 296 297 int psb_runtime_suspend(struct device *dev) 298 { 299 return gma_power_suspend(dev); 300 } 301 302 int psb_runtime_resume(struct device *dev) 303 { 304 return gma_power_resume(dev); 305 } 306 307 int psb_runtime_idle(struct device *dev) 308 { 309 struct drm_device *drmdev = pci_get_drvdata(to_pci_dev(dev)); 310 struct drm_psb_private *dev_priv = drmdev->dev_private; 311 if (dev_priv->display_count) 312 return 0; 313 else 314 return 1; 315 } 316