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