1*4882a593Smuzhiyun // SPDX-License-Identifier: MIT
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright © 2019 Intel Corporation
4*4882a593Smuzhiyun */
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun #include <linux/vga_switcheroo.h>
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include "i915_drv.h"
9*4882a593Smuzhiyun #include "i915_switcheroo.h"
10*4882a593Smuzhiyun
i915_switcheroo_set_state(struct pci_dev * pdev,enum vga_switcheroo_state state)11*4882a593Smuzhiyun static void i915_switcheroo_set_state(struct pci_dev *pdev,
12*4882a593Smuzhiyun enum vga_switcheroo_state state)
13*4882a593Smuzhiyun {
14*4882a593Smuzhiyun struct drm_i915_private *i915 = pdev_to_i915(pdev);
15*4882a593Smuzhiyun pm_message_t pmm = { .event = PM_EVENT_SUSPEND };
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun if (!i915) {
18*4882a593Smuzhiyun dev_err(&pdev->dev, "DRM not initialized, aborting switch.\n");
19*4882a593Smuzhiyun return;
20*4882a593Smuzhiyun }
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun if (state == VGA_SWITCHEROO_ON) {
23*4882a593Smuzhiyun drm_info(&i915->drm, "switched on\n");
24*4882a593Smuzhiyun i915->drm.switch_power_state = DRM_SWITCH_POWER_CHANGING;
25*4882a593Smuzhiyun /* i915 resume handler doesn't set to D0 */
26*4882a593Smuzhiyun pci_set_power_state(pdev, PCI_D0);
27*4882a593Smuzhiyun i915_resume_switcheroo(i915);
28*4882a593Smuzhiyun i915->drm.switch_power_state = DRM_SWITCH_POWER_ON;
29*4882a593Smuzhiyun } else {
30*4882a593Smuzhiyun drm_info(&i915->drm, "switched off\n");
31*4882a593Smuzhiyun i915->drm.switch_power_state = DRM_SWITCH_POWER_CHANGING;
32*4882a593Smuzhiyun i915_suspend_switcheroo(i915, pmm);
33*4882a593Smuzhiyun i915->drm.switch_power_state = DRM_SWITCH_POWER_OFF;
34*4882a593Smuzhiyun }
35*4882a593Smuzhiyun }
36*4882a593Smuzhiyun
i915_switcheroo_can_switch(struct pci_dev * pdev)37*4882a593Smuzhiyun static bool i915_switcheroo_can_switch(struct pci_dev *pdev)
38*4882a593Smuzhiyun {
39*4882a593Smuzhiyun struct drm_i915_private *i915 = pdev_to_i915(pdev);
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun /*
42*4882a593Smuzhiyun * FIXME: open_count is protected by drm_global_mutex but that would lead to
43*4882a593Smuzhiyun * locking inversion with the driver load path. And the access here is
44*4882a593Smuzhiyun * completely racy anyway. So don't bother with locking for now.
45*4882a593Smuzhiyun */
46*4882a593Smuzhiyun return i915 && atomic_read(&i915->drm.open_count) == 0;
47*4882a593Smuzhiyun }
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun static const struct vga_switcheroo_client_ops i915_switcheroo_ops = {
50*4882a593Smuzhiyun .set_gpu_state = i915_switcheroo_set_state,
51*4882a593Smuzhiyun .reprobe = NULL,
52*4882a593Smuzhiyun .can_switch = i915_switcheroo_can_switch,
53*4882a593Smuzhiyun };
54*4882a593Smuzhiyun
i915_switcheroo_register(struct drm_i915_private * i915)55*4882a593Smuzhiyun int i915_switcheroo_register(struct drm_i915_private *i915)
56*4882a593Smuzhiyun {
57*4882a593Smuzhiyun struct pci_dev *pdev = i915->drm.pdev;
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun return vga_switcheroo_register_client(pdev, &i915_switcheroo_ops, false);
60*4882a593Smuzhiyun }
61*4882a593Smuzhiyun
i915_switcheroo_unregister(struct drm_i915_private * i915)62*4882a593Smuzhiyun void i915_switcheroo_unregister(struct drm_i915_private *i915)
63*4882a593Smuzhiyun {
64*4882a593Smuzhiyun struct pci_dev *pdev = i915->drm.pdev;
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun vga_switcheroo_unregister_client(pdev);
67*4882a593Smuzhiyun }
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