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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 | ||
8 | #include "i915_drv.h" | |
9 | #include "i915_switcheroo.h" | |
10 | ||
11 | static void i915_switcheroo_set_state(struct pci_dev *pdev, | |
12 | enum vga_switcheroo_state state) | |
13 | { | |
14 | struct drm_i915_private *i915 = pdev_to_i915(pdev); | |
15 | pm_message_t pmm = { .event = PM_EVENT_SUSPEND }; | |
16 | ||
17 | if (!i915) { | |
18 | dev_err(&pdev->dev, "DRM not initialized, aborting switch.\n"); | |
19 | return; | |
20 | } | |
21 | ||
22 | if (state == VGA_SWITCHEROO_ON) { | |
23 | pr_info("switched on\n"); | |
24 | i915->drm.switch_power_state = DRM_SWITCH_POWER_CHANGING; | |
25 | /* i915 resume handler doesn't set to D0 */ | |
26 | pci_set_power_state(pdev, PCI_D0); | |
27 | i915_resume_switcheroo(i915); | |
28 | i915->drm.switch_power_state = DRM_SWITCH_POWER_ON; | |
29 | } else { | |
30 | pr_info("switched off\n"); | |
31 | i915->drm.switch_power_state = DRM_SWITCH_POWER_CHANGING; | |
32 | i915_suspend_switcheroo(i915, pmm); | |
33 | i915->drm.switch_power_state = DRM_SWITCH_POWER_OFF; | |
34 | } | |
35 | } | |
36 | ||
37 | static bool i915_switcheroo_can_switch(struct pci_dev *pdev) | |
38 | { | |
39 | struct drm_i915_private *i915 = pdev_to_i915(pdev); | |
40 | ||
41 | /* | |
42 | * FIXME: open_count is protected by drm_global_mutex but that would lead to | |
43 | * locking inversion with the driver load path. And the access here is | |
44 | * completely racy anyway. So don't bother with locking for now. | |
45 | */ | |
7e13ad89 | 46 | return i915 && atomic_read(&i915->drm.open_count) == 0; |
63bf8301 JN |
47 | } |
48 | ||
49 | static const struct vga_switcheroo_client_ops i915_switcheroo_ops = { | |
50 | .set_gpu_state = i915_switcheroo_set_state, | |
51 | .reprobe = NULL, | |
52 | .can_switch = i915_switcheroo_can_switch, | |
53 | }; | |
54 | ||
55 | int i915_switcheroo_register(struct drm_i915_private *i915) | |
56 | { | |
57 | struct pci_dev *pdev = i915->drm.pdev; | |
58 | ||
59 | return vga_switcheroo_register_client(pdev, &i915_switcheroo_ops, false); | |
60 | } | |
61 | ||
62 | void i915_switcheroo_unregister(struct drm_i915_private *i915) | |
63 | { | |
64 | struct pci_dev *pdev = i915->drm.pdev; | |
65 | ||
66 | vga_switcheroo_unregister_client(pdev); | |
67 | } |