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