projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 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) { | |
| f54efb6a | 23 | drm_info(&i915->drm, "switched on\n"); |
| 63bf8301 JN |
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 { | |
| f54efb6a | 30 | drm_info(&i915->drm, "switched off\n"); |
| 63bf8301 JN |
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 | } |