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