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 "gem.h" 32 #include "power.h" 33 #include "psb_drv.h" 34 #include "psb_reg.h" 35 #include "psb_intel_reg.h" 36 #include "psb_irq.h" 37 #include <linux/mutex.h> 38 #include <linux/pm_runtime.h> 39 40 /** 41 * gma_power_init - initialise power manager 42 * @dev: our device 43 * 44 * Set up for power management tracking of our hardware. 45 */ 46 void gma_power_init(struct drm_device *dev) 47 { 48 struct drm_psb_private *dev_priv = to_drm_psb_private(dev); 49 50 /* FIXME: Move APM/OSPM base into relevant device code */ 51 dev_priv->apm_base = dev_priv->apm_reg & 0xffff; 52 dev_priv->ospm_base &= 0xffff; 53 54 if (dev_priv->ops->init_pm) 55 dev_priv->ops->init_pm(dev); 56 57 /* 58 * Runtime pm support is broken atm. So for now unconditionally 59 * call pm_runtime_get() here and put it again in psb_driver_unload() 60 * 61 * To fix this we need to call pm_runtime_get() once for each active 62 * pipe at boot and then put() / get() for each pipe disable / enable 63 * so that the device gets runtime suspended when no pipes are active. 64 * Once this is in place the pm_runtime_get() below should be replaced 65 * by a pm_runtime_allow() call to undo the pm_runtime_forbid() from 66 * pci_pm_init(). 67 */ 68 pm_runtime_get(dev->dev); 69 70 dev_priv->pm_initialized = true; 71 } 72 73 /** 74 * gma_power_uninit - end power manager 75 * @dev: device to end for 76 * 77 * Undo the effects of gma_power_init 78 */ 79 void gma_power_uninit(struct drm_device *dev) 80 { 81 struct drm_psb_private *dev_priv = to_drm_psb_private(dev); 82 83 if (!dev_priv->pm_initialized) 84 return; 85 86 pm_runtime_put_noidle(dev->dev); 87 } 88 89 /** 90 * gma_suspend_display - suspend the display logic 91 * @dev: our DRM device 92 * 93 * Suspend the display logic of the graphics interface 94 */ 95 static void gma_suspend_display(struct drm_device *dev) 96 { 97 struct drm_psb_private *dev_priv = to_drm_psb_private(dev); 98 99 dev_priv->ops->save_regs(dev); 100 dev_priv->ops->power_down(dev); 101 } 102 103 /** 104 * gma_resume_display - resume display side logic 105 * @pdev: PCI device 106 * 107 * Resume the display hardware restoring state and enabling 108 * as necessary. 109 */ 110 static void gma_resume_display(struct pci_dev *pdev) 111 { 112 struct drm_device *dev = pci_get_drvdata(pdev); 113 struct drm_psb_private *dev_priv = to_drm_psb_private(dev); 114 115 /* turn on the display power island */ 116 dev_priv->ops->power_up(dev); 117 118 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); 121 122 /* Rebuild our GTT mappings */ 123 psb_gtt_resume(dev); 124 psb_gem_mm_resume(dev); 125 dev_priv->ops->restore_regs(dev); 126 } 127 128 /** 129 * gma_suspend_pci - suspend PCI side 130 * @pdev: PCI device 131 * 132 * Perform the suspend processing on our PCI device state 133 */ 134 static void gma_suspend_pci(struct pci_dev *pdev) 135 { 136 struct drm_device *dev = pci_get_drvdata(pdev); 137 struct drm_psb_private *dev_priv = to_drm_psb_private(dev); 138 int bsm, vbt; 139 140 pci_save_state(pdev); 141 pci_read_config_dword(pdev, 0x5C, &bsm); 142 dev_priv->regs.saveBSM = bsm; 143 pci_read_config_dword(pdev, 0xFC, &vbt); 144 dev_priv->regs.saveVBT = vbt; 145 146 pci_disable_device(pdev); 147 pci_set_power_state(pdev, PCI_D3hot); 148 } 149 150 /** 151 * gma_resume_pci - resume helper 152 * @pdev: our PCI device 153 * 154 * Perform the resume processing on our PCI device state - rewrite 155 * register state and re-enable the PCI device 156 */ 157 static int gma_resume_pci(struct pci_dev *pdev) 158 { 159 struct drm_device *dev = pci_get_drvdata(pdev); 160 struct drm_psb_private *dev_priv = to_drm_psb_private(dev); 161 162 pci_set_power_state(pdev, PCI_D0); 163 pci_restore_state(pdev); 164 pci_write_config_dword(pdev, 0x5c, dev_priv->regs.saveBSM); 165 pci_write_config_dword(pdev, 0xFC, dev_priv->regs.saveVBT); 166 167 return pci_enable_device(pdev); 168 } 169 170 /** 171 * gma_power_suspend - bus callback for suspend 172 * @_dev: our device 173 * 174 * Called back by the PCI layer during a suspend of the system. We 175 * perform the necessary shut down steps and save enough state that 176 * we can undo this when resume is called. 177 */ 178 int gma_power_suspend(struct device *_dev) 179 { 180 struct pci_dev *pdev = to_pci_dev(_dev); 181 struct drm_device *dev = pci_get_drvdata(pdev); 182 183 gma_irq_uninstall(dev); 184 gma_suspend_display(dev); 185 gma_suspend_pci(pdev); 186 return 0; 187 } 188 189 /** 190 * gma_power_resume - resume power 191 * @_dev: our device 192 * 193 * Resume the PCI side of the graphics and then the displays 194 */ 195 int gma_power_resume(struct device *_dev) 196 { 197 struct pci_dev *pdev = to_pci_dev(_dev); 198 struct drm_device *dev = pci_get_drvdata(pdev); 199 200 gma_resume_pci(pdev); 201 gma_resume_display(pdev); 202 gma_irq_install(dev); 203 return 0; 204 } 205 206 /** 207 * gma_power_begin - begin requiring power 208 * @dev: our DRM device 209 * @force_on: true to force power on 210 * 211 * Begin an action that requires the display power island is enabled. 212 * We refcount the islands. 213 */ 214 bool gma_power_begin(struct drm_device *dev, bool force_on) 215 { 216 if (force_on) 217 return pm_runtime_resume_and_get(dev->dev) == 0; 218 else 219 return pm_runtime_get_if_in_use(dev->dev) == 1; 220 } 221 222 /** 223 * gma_power_end - end use of power 224 * @dev: Our DRM device 225 * 226 * Indicate that one of our gma_power_begin() requested periods when 227 * the diplay island power is needed has completed. 228 */ 229 void gma_power_end(struct drm_device *dev) 230 { 231 pm_runtime_put(dev->dev); 232 } 233