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Merge tag 'devicetree-fixes-for-4.19-3' of git://git.kernel.org/pub/scm/linux/kernel...
[rpmsg/rpmsg.git] / drivers / gpu / drm / nouveau / nouveau_vga.c
1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/vgaarb.h>
3 #include <linux/vga_switcheroo.h>
5 #include <drm/drmP.h>
6 #include <drm/drm_crtc_helper.h>
7 #include <drm/drm_fb_helper.h>
9 #include "nouveau_drv.h"
10 #include "nouveau_acpi.h"
11 #include "nouveau_fbcon.h"
12 #include "nouveau_vga.h"
14 static unsigned int
15 nouveau_vga_set_decode(void *priv, bool state)
16 {
17         struct nouveau_drm *drm = nouveau_drm(priv);
18         struct nvif_object *device = &drm->client.device.object;
20         if (drm->client.device.info.family == NV_DEVICE_INFO_V0_CURIE &&
21             drm->client.device.info.chipset >= 0x4c)
22                 nvif_wr32(device, 0x088060, state);
23         else
24         if (drm->client.device.info.chipset >= 0x40)
25                 nvif_wr32(device, 0x088054, state);
26         else
27                 nvif_wr32(device, 0x001854, state);
29         if (state)
30                 return VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM |
31                        VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
32         else
33                 return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
34 }
36 static void
37 nouveau_switcheroo_set_state(struct pci_dev *pdev,
38                              enum vga_switcheroo_state state)
39 {
40         struct drm_device *dev = pci_get_drvdata(pdev);
42         if ((nouveau_is_optimus() || nouveau_is_v1_dsm()) && state == VGA_SWITCHEROO_OFF)
43                 return;
45         if (state == VGA_SWITCHEROO_ON) {
46                 pr_err("VGA switcheroo: switched nouveau on\n");
47                 dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
48                 nouveau_pmops_resume(&pdev->dev);
49                 dev->switch_power_state = DRM_SWITCH_POWER_ON;
50         } else {
51                 pr_err("VGA switcheroo: switched nouveau off\n");
52                 dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
53                 nouveau_switcheroo_optimus_dsm();
54                 nouveau_pmops_suspend(&pdev->dev);
55                 dev->switch_power_state = DRM_SWITCH_POWER_OFF;
56         }
57 }
59 static void
60 nouveau_switcheroo_reprobe(struct pci_dev *pdev)
61 {
62         struct drm_device *dev = pci_get_drvdata(pdev);
63         drm_fb_helper_output_poll_changed(dev);
64 }
66 static bool
67 nouveau_switcheroo_can_switch(struct pci_dev *pdev)
68 {
69         struct drm_device *dev = pci_get_drvdata(pdev);
71         /*
72          * FIXME: open_count is protected by drm_global_mutex but that would lead to
73          * locking inversion with the driver load path. And the access here is
74          * completely racy anyway. So don't bother with locking for now.
75          */
76         return dev->open_count == 0;
77 }
79 static const struct vga_switcheroo_client_ops
80 nouveau_switcheroo_ops = {
81         .set_gpu_state = nouveau_switcheroo_set_state,
82         .reprobe = nouveau_switcheroo_reprobe,
83         .can_switch = nouveau_switcheroo_can_switch,
84 };
86 void
87 nouveau_vga_init(struct nouveau_drm *drm)
88 {
89         struct drm_device *dev = drm->dev;
90         bool runtime = nouveau_pmops_runtime();
92         /* only relevant for PCI devices */
93         if (!dev->pdev)
94                 return;
96         vga_client_register(dev->pdev, dev, NULL, nouveau_vga_set_decode);
98         /* don't register Thunderbolt eGPU with vga_switcheroo */
99         if (pci_is_thunderbolt_attached(dev->pdev))
100                 return;
102         vga_switcheroo_register_client(dev->pdev, &nouveau_switcheroo_ops, runtime);
104         if (runtime && nouveau_is_v1_dsm() && !nouveau_is_optimus())
105                 vga_switcheroo_init_domain_pm_ops(drm->dev->dev, &drm->vga_pm_domain);
108 void
109 nouveau_vga_fini(struct nouveau_drm *drm)
111         struct drm_device *dev = drm->dev;
112         bool runtime = nouveau_pmops_runtime();
114         /* only relevant for PCI devices */
115         if (!dev->pdev)
116                 return;
118         vga_client_register(dev->pdev, NULL, NULL, NULL);
120         if (pci_is_thunderbolt_attached(dev->pdev))
121                 return;
123         vga_switcheroo_unregister_client(dev->pdev);
124         if (runtime && nouveau_is_v1_dsm() && !nouveau_is_optimus())
125                 vga_switcheroo_fini_domain_pm_ops(drm->dev->dev);
129 void
130 nouveau_vga_lastclose(struct drm_device *dev)
132         vga_switcheroo_process_delayed_switch();