163bf8301SJani Nikula // SPDX-License-Identifier: MIT
263bf8301SJani Nikula /*
363bf8301SJani Nikula * Copyright © 2019 Intel Corporation
463bf8301SJani Nikula */
563bf8301SJani Nikula
663bf8301SJani Nikula #include <linux/vga_switcheroo.h>
763bf8301SJani Nikula
858471f63SJani Nikula #include "i915_driver.h"
963bf8301SJani Nikula #include "i915_drv.h"
1063bf8301SJani Nikula #include "i915_switcheroo.h"
1163bf8301SJani Nikula
i915_switcheroo_set_state(struct pci_dev * pdev,enum vga_switcheroo_state state)1263bf8301SJani Nikula static void i915_switcheroo_set_state(struct pci_dev *pdev,
1363bf8301SJani Nikula enum vga_switcheroo_state state)
1463bf8301SJani Nikula {
1563bf8301SJani Nikula struct drm_i915_private *i915 = pdev_to_i915(pdev);
1663bf8301SJani Nikula pm_message_t pmm = { .event = PM_EVENT_SUSPEND };
1763bf8301SJani Nikula
1863bf8301SJani Nikula if (!i915) {
1963bf8301SJani Nikula dev_err(&pdev->dev, "DRM not initialized, aborting switch.\n");
2063bf8301SJani Nikula return;
2163bf8301SJani Nikula }
22*a273e957SThomas Zimmermann if (!HAS_DISPLAY(i915)) {
23*a273e957SThomas Zimmermann dev_err(&pdev->dev, "Device state not initialized, aborting switch.\n");
24*a273e957SThomas Zimmermann return;
25*a273e957SThomas Zimmermann }
2663bf8301SJani Nikula
2763bf8301SJani Nikula if (state == VGA_SWITCHEROO_ON) {
28f54efb6aSJani Nikula drm_info(&i915->drm, "switched on\n");
2963bf8301SJani Nikula i915->drm.switch_power_state = DRM_SWITCH_POWER_CHANGING;
3063bf8301SJani Nikula /* i915 resume handler doesn't set to D0 */
3163bf8301SJani Nikula pci_set_power_state(pdev, PCI_D0);
32b8d65b8aSJani Nikula i915_driver_resume_switcheroo(i915);
3363bf8301SJani Nikula i915->drm.switch_power_state = DRM_SWITCH_POWER_ON;
3463bf8301SJani Nikula } else {
35f54efb6aSJani Nikula drm_info(&i915->drm, "switched off\n");
3663bf8301SJani Nikula i915->drm.switch_power_state = DRM_SWITCH_POWER_CHANGING;
37b8d65b8aSJani Nikula i915_driver_suspend_switcheroo(i915, pmm);
3863bf8301SJani Nikula i915->drm.switch_power_state = DRM_SWITCH_POWER_OFF;
3963bf8301SJani Nikula }
4063bf8301SJani Nikula }
4163bf8301SJani Nikula
i915_switcheroo_can_switch(struct pci_dev * pdev)4263bf8301SJani Nikula static bool i915_switcheroo_can_switch(struct pci_dev *pdev)
4363bf8301SJani Nikula {
4463bf8301SJani Nikula struct drm_i915_private *i915 = pdev_to_i915(pdev);
4563bf8301SJani Nikula
4663bf8301SJani Nikula /*
4763bf8301SJani Nikula * FIXME: open_count is protected by drm_global_mutex but that would lead to
4863bf8301SJani Nikula * locking inversion with the driver load path. And the access here is
4963bf8301SJani Nikula * completely racy anyway. So don't bother with locking for now.
5063bf8301SJani Nikula */
51*a273e957SThomas Zimmermann return i915 && HAS_DISPLAY(i915) && atomic_read(&i915->drm.open_count) == 0;
5263bf8301SJani Nikula }
5363bf8301SJani Nikula
5463bf8301SJani Nikula static const struct vga_switcheroo_client_ops i915_switcheroo_ops = {
5563bf8301SJani Nikula .set_gpu_state = i915_switcheroo_set_state,
5663bf8301SJani Nikula .reprobe = NULL,
5763bf8301SJani Nikula .can_switch = i915_switcheroo_can_switch,
5863bf8301SJani Nikula };
5963bf8301SJani Nikula
i915_switcheroo_register(struct drm_i915_private * i915)6063bf8301SJani Nikula int i915_switcheroo_register(struct drm_i915_private *i915)
6163bf8301SJani Nikula {
628ff5446aSThomas Zimmermann struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
6363bf8301SJani Nikula
6463bf8301SJani Nikula return vga_switcheroo_register_client(pdev, &i915_switcheroo_ops, false);
6563bf8301SJani Nikula }
6663bf8301SJani Nikula
i915_switcheroo_unregister(struct drm_i915_private * i915)6763bf8301SJani Nikula void i915_switcheroo_unregister(struct drm_i915_private *i915)
6863bf8301SJani Nikula {
698ff5446aSThomas Zimmermann struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
7063bf8301SJani Nikula
7163bf8301SJani Nikula vga_switcheroo_unregister_client(pdev);
7263bf8301SJani Nikula }
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