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_device.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 struct intel_display *display = i915 ? i915->display : NULL; 19 pm_message_t pmm = { .event = PM_EVENT_SUSPEND }; 20 21 if (!i915) { 22 dev_err(&pdev->dev, "DRM not initialized, aborting switch.\n"); 23 return; 24 } 25 if (!intel_display_device_present(display)) { 26 dev_err(&pdev->dev, "Device state not initialized, aborting switch.\n"); 27 return; 28 } 29 30 if (state == VGA_SWITCHEROO_ON) { 31 drm_info(&i915->drm, "switched on\n"); 32 i915->drm.switch_power_state = DRM_SWITCH_POWER_CHANGING; 33 /* i915 resume handler doesn't set to D0 */ 34 pci_set_power_state(pdev, PCI_D0); 35 i915_driver_resume_switcheroo(i915); 36 i915->drm.switch_power_state = DRM_SWITCH_POWER_ON; 37 } else { 38 drm_info(&i915->drm, "switched off\n"); 39 i915->drm.switch_power_state = DRM_SWITCH_POWER_CHANGING; 40 i915_driver_suspend_switcheroo(i915, pmm); 41 i915->drm.switch_power_state = DRM_SWITCH_POWER_OFF; 42 } 43 } 44 45 static bool i915_switcheroo_can_switch(struct pci_dev *pdev) 46 { 47 struct drm_i915_private *i915 = pdev_to_i915(pdev); 48 struct intel_display *display = i915 ? i915->display : NULL; 49 50 /* 51 * FIXME: open_count is protected by drm_global_mutex but that would lead to 52 * locking inversion with the driver load path. And the access here is 53 * completely racy anyway. So don't bother with locking for now. 54 */ 55 return i915 && intel_display_device_present(display) && 56 atomic_read(&i915->drm.open_count) == 0; 57 } 58 59 static const struct vga_switcheroo_client_ops i915_switcheroo_ops = { 60 .set_gpu_state = i915_switcheroo_set_state, 61 .reprobe = NULL, 62 .can_switch = i915_switcheroo_can_switch, 63 }; 64 65 int i915_switcheroo_register(struct drm_i915_private *i915) 66 { 67 struct pci_dev *pdev = to_pci_dev(i915->drm.dev); 68 69 return vga_switcheroo_register_client(pdev, &i915_switcheroo_ops, false); 70 } 71 72 void i915_switcheroo_unregister(struct drm_i915_private *i915) 73 { 74 struct pci_dev *pdev = to_pci_dev(i915->drm.dev); 75 76 vga_switcheroo_unregister_client(pdev); 77 } 78