1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright © 2019 Intel Corporation 4 */ 5 6 #include <linux/vga_switcheroo.h> 7 8 #include <drm/drm_print.h> 9 10 #include "display/intel_display_device.h" 11 12 #include "i915_driver.h" 13 #include "i915_drv.h" 14 #include "i915_switcheroo.h" 15 16 static void i915_switcheroo_set_state(struct pci_dev *pdev, 17 enum vga_switcheroo_state state) 18 { 19 struct drm_i915_private *i915 = pdev_to_i915(pdev); 20 struct intel_display *display = i915 ? i915->display : NULL; 21 pm_message_t pmm = { .event = PM_EVENT_SUSPEND }; 22 23 if (!i915) { 24 dev_err(&pdev->dev, "DRM not initialized, aborting switch.\n"); 25 return; 26 } 27 if (!intel_display_device_present(display)) { 28 dev_err(&pdev->dev, "Device state not initialized, aborting switch.\n"); 29 return; 30 } 31 32 if (state == VGA_SWITCHEROO_ON) { 33 drm_info(&i915->drm, "switched on\n"); 34 i915->drm.switch_power_state = DRM_SWITCH_POWER_CHANGING; 35 /* i915 resume handler doesn't set to D0 */ 36 pci_set_power_state(pdev, PCI_D0); 37 i915_driver_resume_switcheroo(i915); 38 i915->drm.switch_power_state = DRM_SWITCH_POWER_ON; 39 } else { 40 drm_info(&i915->drm, "switched off\n"); 41 i915->drm.switch_power_state = DRM_SWITCH_POWER_CHANGING; 42 i915_driver_suspend_switcheroo(i915, pmm); 43 i915->drm.switch_power_state = DRM_SWITCH_POWER_OFF; 44 } 45 } 46 47 static bool i915_switcheroo_can_switch(struct pci_dev *pdev) 48 { 49 struct drm_i915_private *i915 = pdev_to_i915(pdev); 50 struct intel_display *display = i915 ? i915->display : NULL; 51 52 /* 53 * FIXME: open_count is protected by drm_global_mutex but that would lead to 54 * locking inversion with the driver load path. And the access here is 55 * completely racy anyway. So don't bother with locking for now. 56 */ 57 return i915 && intel_display_device_present(display) && 58 atomic_read(&i915->drm.open_count) == 0; 59 } 60 61 static const struct vga_switcheroo_client_ops i915_switcheroo_ops = { 62 .set_gpu_state = i915_switcheroo_set_state, 63 .reprobe = NULL, 64 .can_switch = i915_switcheroo_can_switch, 65 }; 66 67 int i915_switcheroo_register(struct drm_i915_private *i915) 68 { 69 struct pci_dev *pdev = to_pci_dev(i915->drm.dev); 70 71 return vga_switcheroo_register_client(pdev, &i915_switcheroo_ops, false); 72 } 73 74 void i915_switcheroo_unregister(struct drm_i915_private *i915) 75 { 76 struct pci_dev *pdev = to_pci_dev(i915->drm.dev); 77 78 vga_switcheroo_unregister_client(pdev); 79 } 80