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
14static 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
44static 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
56static 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
64int 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
75void 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