Alan Cox | bbbb262 | 2011-11-03 18:21:31 +0000 | [diff] [blame] | 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 | |
Kirill A. Shutemov | c715bc1 | 2012-03-08 16:01:51 +0000 | [diff] [blame] | 61 | if (dev_priv->ops->init_pm) |
| 62 | dev_priv->ops->init_pm(dev); |
Alan Cox | bbbb262 | 2011-11-03 18:21:31 +0000 | [diff] [blame] | 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 | |
Alan Cox | bbbb262 | 2011-11-03 18:21:31 +0000 | [diff] [blame] | 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); |
Patrik Jakobsson | 8ba8209 | 2013-04-06 00:15:21 +0200 | [diff] [blame] | 113 | |
| 114 | psb_gtt_restore(dev); /* Rebuild our GTT mappings */ |
Alan Cox | bbbb262 | 2011-11-03 18:21:31 +0000 | [diff] [blame] | 115 | dev_priv->ops->restore_regs(dev); |
| 116 | } |
| 117 | |
| 118 | /** |
| 119 | * gma_suspend_pci - suspend PCI side |
| 120 | * @pdev: PCI device |
| 121 | * |
| 122 | * Perform the suspend processing on our PCI device state |
| 123 | */ |
| 124 | static void gma_suspend_pci(struct pci_dev *pdev) |
| 125 | { |
| 126 | struct drm_device *dev = pci_get_drvdata(pdev); |
| 127 | struct drm_psb_private *dev_priv = dev->dev_private; |
| 128 | int bsm, vbt; |
| 129 | |
| 130 | if (dev_priv->suspended) |
| 131 | return; |
| 132 | |
| 133 | pci_save_state(pdev); |
| 134 | pci_read_config_dword(pdev, 0x5C, &bsm); |
Alan Cox | 648a8e3 | 2012-03-08 16:00:31 +0000 | [diff] [blame] | 135 | dev_priv->regs.saveBSM = bsm; |
Alan Cox | bbbb262 | 2011-11-03 18:21:31 +0000 | [diff] [blame] | 136 | pci_read_config_dword(pdev, 0xFC, &vbt); |
Alan Cox | 648a8e3 | 2012-03-08 16:00:31 +0000 | [diff] [blame] | 137 | dev_priv->regs.saveVBT = vbt; |
Alan Cox | bbbb262 | 2011-11-03 18:21:31 +0000 | [diff] [blame] | 138 | pci_read_config_dword(pdev, PSB_PCIx_MSI_ADDR_LOC, &dev_priv->msi_addr); |
| 139 | pci_read_config_dword(pdev, PSB_PCIx_MSI_DATA_LOC, &dev_priv->msi_data); |
| 140 | |
| 141 | pci_disable_device(pdev); |
| 142 | pci_set_power_state(pdev, PCI_D3hot); |
| 143 | |
| 144 | dev_priv->suspended = true; |
| 145 | } |
| 146 | |
| 147 | /** |
| 148 | * gma_resume_pci - resume helper |
| 149 | * @dev: our PCI device |
| 150 | * |
| 151 | * Perform the resume processing on our PCI device state - rewrite |
| 152 | * register state and re-enable the PCI device |
| 153 | */ |
| 154 | static bool gma_resume_pci(struct pci_dev *pdev) |
| 155 | { |
| 156 | struct drm_device *dev = pci_get_drvdata(pdev); |
| 157 | struct drm_psb_private *dev_priv = dev->dev_private; |
| 158 | int ret; |
| 159 | |
| 160 | if (!dev_priv->suspended) |
| 161 | return true; |
| 162 | |
| 163 | pci_set_power_state(pdev, PCI_D0); |
| 164 | pci_restore_state(pdev); |
Alan Cox | 648a8e3 | 2012-03-08 16:00:31 +0000 | [diff] [blame] | 165 | pci_write_config_dword(pdev, 0x5c, dev_priv->regs.saveBSM); |
| 166 | pci_write_config_dword(pdev, 0xFC, dev_priv->regs.saveVBT); |
Alan Cox | bbbb262 | 2011-11-03 18:21:31 +0000 | [diff] [blame] | 167 | /* restoring MSI address and data in PCIx space */ |
| 168 | pci_write_config_dword(pdev, PSB_PCIx_MSI_ADDR_LOC, dev_priv->msi_addr); |
| 169 | pci_write_config_dword(pdev, PSB_PCIx_MSI_DATA_LOC, dev_priv->msi_data); |
| 170 | ret = pci_enable_device(pdev); |
| 171 | |
| 172 | if (ret != 0) |
| 173 | dev_err(&pdev->dev, "pci_enable failed: %d\n", ret); |
| 174 | else |
| 175 | dev_priv->suspended = false; |
| 176 | return !dev_priv->suspended; |
| 177 | } |
| 178 | |
| 179 | /** |
| 180 | * gma_power_suspend - bus callback for suspend |
| 181 | * @pdev: our PCI device |
| 182 | * @state: suspend type |
| 183 | * |
| 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. |
| 187 | */ |
| 188 | int gma_power_suspend(struct device *_dev) |
| 189 | { |
Geliang Tang | d21b02a | 2015-12-27 18:45:58 +0800 | [diff] [blame] | 190 | struct pci_dev *pdev = to_pci_dev(_dev); |
Alan Cox | bbbb262 | 2011-11-03 18:21:31 +0000 | [diff] [blame] | 191 | struct drm_device *dev = pci_get_drvdata(pdev); |
| 192 | struct drm_psb_private *dev_priv = dev->dev_private; |
| 193 | |
| 194 | mutex_lock(&power_mutex); |
| 195 | if (!dev_priv->suspended) { |
| 196 | if (dev_priv->display_count) { |
| 197 | mutex_unlock(&power_mutex); |
Alan Cox | 09016a1 | 2012-03-14 12:00:29 +0000 | [diff] [blame] | 198 | dev_err(dev->dev, "GPU hardware busy, cannot suspend\n"); |
Alan Cox | bbbb262 | 2011-11-03 18:21:31 +0000 | [diff] [blame] | 199 | return -EBUSY; |
| 200 | } |
| 201 | psb_irq_uninstall(dev); |
| 202 | gma_suspend_display(dev); |
| 203 | gma_suspend_pci(pdev); |
| 204 | } |
| 205 | mutex_unlock(&power_mutex); |
| 206 | return 0; |
| 207 | } |
| 208 | |
| 209 | /** |
| 210 | * gma_power_resume - resume power |
| 211 | * @pdev: PCI device |
| 212 | * |
| 213 | * Resume the PCI side of the graphics and then the displays |
| 214 | */ |
| 215 | int gma_power_resume(struct device *_dev) |
| 216 | { |
Geliang Tang | d21b02a | 2015-12-27 18:45:58 +0800 | [diff] [blame] | 217 | struct pci_dev *pdev = to_pci_dev(_dev); |
Alan Cox | bbbb262 | 2011-11-03 18:21:31 +0000 | [diff] [blame] | 218 | struct drm_device *dev = pci_get_drvdata(pdev); |
| 219 | |
| 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); |
| 226 | return 0; |
| 227 | } |
| 228 | |
| 229 | /** |
| 230 | * gma_power_is_on - returne true if power is on |
| 231 | * @dev: our DRM device |
| 232 | * |
| 233 | * Returns true if the display island power is on at this moment |
| 234 | */ |
| 235 | bool gma_power_is_on(struct drm_device *dev) |
| 236 | { |
| 237 | struct drm_psb_private *dev_priv = dev->dev_private; |
| 238 | return dev_priv->display_power; |
| 239 | } |
| 240 | |
| 241 | /** |
| 242 | * gma_power_begin - begin requiring power |
| 243 | * @dev: our DRM device |
| 244 | * @force_on: true to force power on |
| 245 | * |
| 246 | * Begin an action that requires the display power island is enabled. |
| 247 | * We refcount the islands. |
| 248 | */ |
| 249 | bool gma_power_begin(struct drm_device *dev, bool force_on) |
| 250 | { |
| 251 | struct drm_psb_private *dev_priv = dev->dev_private; |
| 252 | int ret; |
| 253 | unsigned long flags; |
| 254 | |
| 255 | spin_lock_irqsave(&power_ctrl_lock, flags); |
| 256 | /* Power already on ? */ |
| 257 | if (dev_priv->display_power) { |
| 258 | dev_priv->display_count++; |
| 259 | pm_runtime_get(&dev->pdev->dev); |
| 260 | spin_unlock_irqrestore(&power_ctrl_lock, flags); |
| 261 | return true; |
| 262 | } |
| 263 | if (force_on == false) |
| 264 | goto out_false; |
| 265 | |
| 266 | /* Ok power up needed */ |
| 267 | ret = gma_resume_pci(dev->pdev); |
| 268 | if (ret == 0) { |
| 269 | psb_irq_preinstall(dev); |
| 270 | psb_irq_postinstall(dev); |
| 271 | pm_runtime_get(&dev->pdev->dev); |
| 272 | dev_priv->display_count++; |
| 273 | spin_unlock_irqrestore(&power_ctrl_lock, flags); |
| 274 | return true; |
| 275 | } |
| 276 | out_false: |
| 277 | spin_unlock_irqrestore(&power_ctrl_lock, flags); |
| 278 | return false; |
| 279 | } |
| 280 | |
| 281 | /** |
| 282 | * gma_power_end - end use of power |
| 283 | * @dev: Our DRM device |
| 284 | * |
| 285 | * Indicate that one of our gma_power_begin() requested periods when |
| 286 | * the diplay island power is needed has completed. |
| 287 | */ |
| 288 | void gma_power_end(struct drm_device *dev) |
| 289 | { |
| 290 | struct drm_psb_private *dev_priv = dev->dev_private; |
| 291 | unsigned long flags; |
| 292 | spin_lock_irqsave(&power_ctrl_lock, flags); |
| 293 | dev_priv->display_count--; |
| 294 | WARN_ON(dev_priv->display_count < 0); |
| 295 | spin_unlock_irqrestore(&power_ctrl_lock, flags); |
| 296 | pm_runtime_put(&dev->pdev->dev); |
| 297 | } |
| 298 | |
| 299 | int psb_runtime_suspend(struct device *dev) |
| 300 | { |
| 301 | return gma_power_suspend(dev); |
| 302 | } |
| 303 | |
| 304 | int psb_runtime_resume(struct device *dev) |
| 305 | { |
Alan Cox | 09016a1 | 2012-03-14 12:00:29 +0000 | [diff] [blame] | 306 | return gma_power_resume(dev); |
Alan Cox | bbbb262 | 2011-11-03 18:21:31 +0000 | [diff] [blame] | 307 | } |
| 308 | |
| 309 | int psb_runtime_idle(struct device *dev) |
| 310 | { |
| 311 | struct drm_device *drmdev = pci_get_drvdata(to_pci_dev(dev)); |
| 312 | struct drm_psb_private *dev_priv = drmdev->dev_private; |
| 313 | if (dev_priv->display_count) |
| 314 | return 0; |
| 315 | else |
| 316 | return 1; |
| 317 | } |
Patrik Jakobsson | 888eef2 | 2013-04-06 00:45:22 +0200 | [diff] [blame] | 318 | |
| 319 | int gma_power_thaw(struct device *_dev) |
| 320 | { |
| 321 | return gma_power_resume(_dev); |
| 322 | } |
| 323 | |
| 324 | int gma_power_freeze(struct device *_dev) |
| 325 | { |
| 326 | return gma_power_suspend(_dev); |
| 327 | } |
| 328 | |
| 329 | int gma_power_restore(struct device *_dev) |
| 330 | { |
| 331 | return gma_power_resume(_dev); |
| 332 | } |