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->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->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(dev: pdev, PSB_GMCH_CTRL, |
120 | val: 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(dev: pdev); |
141 | pci_read_config_dword(dev: pdev, where: 0x5C, val: &bsm); |
142 | dev_priv->regs.saveBSM = bsm; |
143 | pci_read_config_dword(dev: pdev, where: 0xFC, val: &vbt); |
144 | dev_priv->regs.saveVBT = vbt; |
145 | |
146 | pci_disable_device(dev: pdev); |
147 | pci_set_power_state(dev: 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(dev: pdev, PCI_D0); |
163 | pci_restore_state(dev: pdev); |
164 | pci_write_config_dword(dev: pdev, where: 0x5c, val: dev_priv->regs.saveBSM); |
165 | pci_write_config_dword(dev: pdev, where: 0xFC, val: dev_priv->regs.saveVBT); |
166 | |
167 | return pci_enable_device(dev: 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->dev) == 0; |
218 | else |
219 | return pm_runtime_get_if_in_use(dev: 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->dev); |
232 | } |
233 | |