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