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