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1// SPDX-License-Identifier: MIT2/*3 * Copyright © 2019 Intel Corporation4 */5 6#include <linux/vga_switcheroo.h>7 8#include "i915_driver.h"9#include "i915_drv.h"10#include "i915_switcheroo.h"11 12static 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 if (!HAS_DISPLAY(i915)) {23 dev_err(&pdev->dev, "Device state not initialized, aborting switch.\n");24 return;25 }26 27 if (state == VGA_SWITCHEROO_ON) {28 drm_info(&i915->drm, "switched on\n");29 i915->drm.switch_power_state = DRM_SWITCH_POWER_CHANGING;30 /* i915 resume handler doesn't set to D0 */31 pci_set_power_state(pdev, PCI_D0);32 i915_driver_resume_switcheroo(i915);33 i915->drm.switch_power_state = DRM_SWITCH_POWER_ON;34 } else {35 drm_info(&i915->drm, "switched off\n");36 i915->drm.switch_power_state = DRM_SWITCH_POWER_CHANGING;37 i915_driver_suspend_switcheroo(i915, pmm);38 i915->drm.switch_power_state = DRM_SWITCH_POWER_OFF;39 }40}41 42static bool i915_switcheroo_can_switch(struct pci_dev *pdev)43{44 struct drm_i915_private *i915 = pdev_to_i915(pdev);45 46 /*47 * FIXME: open_count is protected by drm_global_mutex but that would lead to48 * locking inversion with the driver load path. And the access here is49 * completely racy anyway. So don't bother with locking for now.50 */51 return i915 && HAS_DISPLAY(i915) && atomic_read(&i915->drm.open_count) == 0;52}53 54static const struct vga_switcheroo_client_ops i915_switcheroo_ops = {55 .set_gpu_state = i915_switcheroo_set_state,56 .reprobe = NULL,57 .can_switch = i915_switcheroo_can_switch,58};59 60int i915_switcheroo_register(struct drm_i915_private *i915)61{62 struct pci_dev *pdev = to_pci_dev(i915->drm.dev);63 64 return vga_switcheroo_register_client(pdev, &i915_switcheroo_ops, false);65}66 67void i915_switcheroo_unregister(struct drm_i915_private *i915)68{69 struct pci_dev *pdev = to_pci_dev(i915->drm.dev);70 71 vga_switcheroo_unregister_client(pdev);72}73