drivers/gpu/drm/gma500/power.c

   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 }