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63bf8301 JN |
1 | // SPDX-License-Identifier: MIT |
2 | /* | |
3 | * Copyright © 2019 Intel Corporation | |
4 | */ | |
5 | ||
6 | #include <linux/vga_switcheroo.h> | |
7 | ||
58471f63 | 8 | #include "i915_driver.h" |
63bf8301 JN |
9 | #include "i915_drv.h" |
10 | #include "i915_switcheroo.h" | |
11 | ||
12 | static void i915_switcheroo_set_state(struct pci_dev *pdev, | |
13 | enum vga_switcheroo_state state) | |
14 | { | |
15 | struct drm_i915_private *i915 = pdev_to_i915(pdev); | |
16 | pm_message_t pmm = { .event = PM_EVENT_SUSPEND }; | |
17 | ||
18 | if (!i915) { | |
19 | dev_err(&pdev->dev, "DRM not initialized, aborting switch.\n"); | |
20 | return; | |
21 | } | |
22 | ||
23 | if (state == VGA_SWITCHEROO_ON) { | |
f54efb6a | 24 | drm_info(&i915->drm, "switched on\n"); |
63bf8301 JN |
25 | i915->drm.switch_power_state = DRM_SWITCH_POWER_CHANGING; |
26 | /* i915 resume handler doesn't set to D0 */ | |
27 | pci_set_power_state(pdev, PCI_D0); | |
b8d65b8a | 28 | i915_driver_resume_switcheroo(i915); |
63bf8301 JN |
29 | i915->drm.switch_power_state = DRM_SWITCH_POWER_ON; |
30 | } else { | |
f54efb6a | 31 | drm_info(&i915->drm, "switched off\n"); |
63bf8301 | 32 | i915->drm.switch_power_state = DRM_SWITCH_POWER_CHANGING; |
b8d65b8a | 33 | i915_driver_suspend_switcheroo(i915, pmm); |
63bf8301 JN |
34 | i915->drm.switch_power_state = DRM_SWITCH_POWER_OFF; |
35 | } | |
36 | } | |
37 | ||
38 | static bool i915_switcheroo_can_switch(struct pci_dev *pdev) | |
39 | { | |
40 | struct drm_i915_private *i915 = pdev_to_i915(pdev); | |
41 | ||
42 | /* | |
43 | * FIXME: open_count is protected by drm_global_mutex but that would lead to | |
44 | * locking inversion with the driver load path. And the access here is | |
45 | * completely racy anyway. So don't bother with locking for now. | |
46 | */ | |
7e13ad89 | 47 | return i915 && atomic_read(&i915->drm.open_count) == 0; |
63bf8301 JN |
48 | } |
49 | ||
50 | static const struct vga_switcheroo_client_ops i915_switcheroo_ops = { | |
51 | .set_gpu_state = i915_switcheroo_set_state, | |
52 | .reprobe = NULL, | |
53 | .can_switch = i915_switcheroo_can_switch, | |
54 | }; | |
55 | ||
56 | int i915_switcheroo_register(struct drm_i915_private *i915) | |
57 | { | |
8ff5446a | 58 | struct pci_dev *pdev = to_pci_dev(i915->drm.dev); |
63bf8301 JN |
59 | |
60 | return vga_switcheroo_register_client(pdev, &i915_switcheroo_ops, false); | |
61 | } | |
62 | ||
63 | void i915_switcheroo_unregister(struct drm_i915_private *i915) | |
64 | { | |
8ff5446a | 65 | struct pci_dev *pdev = to_pci_dev(i915->drm.dev); |
63bf8301 JN |
66 | |
67 | vga_switcheroo_unregister_client(pdev); | |
68 | } |