1 // SPDX-License-Identifier: MIT
2 /*
3 * Copyright © 2019 Intel Corporation
4 */
5
6 #include <linux/vga_switcheroo.h>
7
8 #include "i915_driver.h"
9 #include "i915_drv.h"
10 #include "i915_switcheroo.h"
11
12 #ifdef notyet
13
i915_switcheroo_set_state(struct pci_dev * pdev,enum vga_switcheroo_state state)14 static void i915_switcheroo_set_state(struct pci_dev *pdev,
15 enum vga_switcheroo_state state)
16 {
17 struct drm_i915_private *i915 = pdev_to_i915(pdev);
18 pm_message_t pmm = { .event = PM_EVENT_SUSPEND };
19
20 if (!i915) {
21 dev_err(&pdev->dev, "DRM not initialized, aborting switch.\n");
22 return;
23 }
24 if (!HAS_DISPLAY(i915)) {
25 dev_err(&pdev->dev, "Device state not initialized, aborting switch.\n");
26 return;
27 }
28
29 if (state == VGA_SWITCHEROO_ON) {
30 drm_info(&i915->drm, "switched on\n");
31 i915->drm.switch_power_state = DRM_SWITCH_POWER_CHANGING;
32 /* i915 resume handler doesn't set to D0 */
33 pci_set_power_state(pdev, PCI_D0);
34 i915_driver_resume_switcheroo(i915);
35 i915->drm.switch_power_state = DRM_SWITCH_POWER_ON;
36 } else {
37 drm_info(&i915->drm, "switched off\n");
38 i915->drm.switch_power_state = DRM_SWITCH_POWER_CHANGING;
39 i915_driver_suspend_switcheroo(i915, pmm);
40 i915->drm.switch_power_state = DRM_SWITCH_POWER_OFF;
41 }
42 }
43
i915_switcheroo_can_switch(struct pci_dev * pdev)44 static bool i915_switcheroo_can_switch(struct pci_dev *pdev)
45 {
46 struct drm_i915_private *i915 = pdev_to_i915(pdev);
47
48 /*
49 * FIXME: open_count is protected by drm_global_mutex but that would lead to
50 * locking inversion with the driver load path. And the access here is
51 * completely racy anyway. So don't bother with locking for now.
52 */
53 return i915 && HAS_DISPLAY(i915) && atomic_read(&i915->drm.open_count) == 0;
54 }
55
56 static const struct vga_switcheroo_client_ops i915_switcheroo_ops = {
57 .set_gpu_state = i915_switcheroo_set_state,
58 .reprobe = NULL,
59 .can_switch = i915_switcheroo_can_switch,
60 };
61
62 #endif /* notyet */
63
i915_switcheroo_register(struct drm_i915_private * i915)64 int i915_switcheroo_register(struct drm_i915_private *i915)
65 {
66 #ifdef notyet
67 struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
68
69 return vga_switcheroo_register_client(pdev, &i915_switcheroo_ops, false);
70 #else
71 return 0;
72 #endif
73 }
74
i915_switcheroo_unregister(struct drm_i915_private * i915)75 void i915_switcheroo_unregister(struct drm_i915_private *i915)
76 {
77 #ifdef notyet
78 struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
79
80 vga_switcheroo_unregister_client(pdev);
81 #endif
82 }
83