drm/nouveau: resurrect headless mode since rework

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

4 files changed, 51 insertions, 35 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index d2f8ffeed742..0185837d9862 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -360,23 +360,26 @@ nouveau_display_create(struct drm_device *dev)
         drm_kms_helper_poll_init(dev);
         drm_kms_helper_poll_disable(dev);
 
-        if (nv_device(drm->device)->card_type < NV_50)
-                ret = nv04_display_create(dev);
-        else
-        if (nv_device(drm->device)->card_type < NV_D0)
-                ret = nv50_display_create(dev);
-        else
-                ret = nvd0_display_create(dev);
-        if (ret)
-                goto disp_create_err;
-
-        if (dev->mode_config.num_crtc) {
-                ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
+        if (nouveau_modeset == 1) {
+                if (nv_device(drm->device)->card_type < NV_50)
+                        ret = nv04_display_create(dev);
+                else
+                if (nv_device(drm->device)->card_type < NV_D0)
+                        ret = nv50_display_create(dev);
+                else
+                        ret = nvd0_display_create(dev);
                 if (ret)
-                        goto vblank_err;
+                        goto disp_create_err;
+
+                if (dev->mode_config.num_crtc) {
+                        ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
+                        if (ret)
+                                goto vblank_err;
+                }
+
+                nouveau_backlight_init(dev);
         }
 
-        nouveau_backlight_init(dev);
         return 0;
 
 vblank_err:
@@ -395,7 +398,8 @@ nouveau_display_destroy(struct drm_device *dev)
         nouveau_backlight_exit(dev);
         drm_vblank_cleanup(dev);
 
-        disp->dtor(dev);
+        if (disp->dtor)
+                disp->dtor(dev);
 
         drm_kms_helper_poll_fini(dev);
         drm_mode_config_cleanup(dev);
diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c b/drivers/gpu/drm/nouveau/nouveau_drm.c
index ccae8c26ae2b..9cc83f18f9dc 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
@@ -63,8 +63,9 @@ MODULE_PARM_DESC(noaccel, "disable kernel/abi16 acceleration");
 static int nouveau_noaccel = 0;
 module_param_named(noaccel, nouveau_noaccel, int, 0400);
 
-MODULE_PARM_DESC(modeset, "enable driver");
-static int nouveau_modeset = -1;
+MODULE_PARM_DESC(modeset, "enable driver (default: auto, "
+                          "0 = disabled, 1 = enabled, 2 = headless)");
+int nouveau_modeset = -1;
 module_param_named(modeset, nouveau_modeset, int, 0400);
 
 static struct drm_driver driver;
@@ -363,7 +364,8 @@ nouveau_drm_unload(struct drm_device *dev)
 
         nouveau_pm_fini(dev);
 
-        nouveau_display_fini(dev);
+        if (dev->mode_config.num_crtc)
+                nouveau_display_fini(dev);
         nouveau_display_destroy(dev);
 
         nouveau_irq_fini(dev);
@@ -403,13 +405,15 @@ nouveau_drm_suspend(struct pci_dev *pdev, pm_message_t pm_state)
             pm_state.event == PM_EVENT_PRETHAW)
                 return 0;
 
-        NV_INFO(drm, "suspending fbcon...\n");
-        nouveau_fbcon_set_suspend(dev, 1);
+        if (dev->mode_config.num_crtc) {
+                NV_INFO(drm, "suspending fbcon...\n");
+                nouveau_fbcon_set_suspend(dev, 1);
 
-        NV_INFO(drm, "suspending display...\n");
-        ret = nouveau_display_suspend(dev);
-        if (ret)
-                return ret;
+                NV_INFO(drm, "suspending display...\n");
+                ret = nouveau_display_suspend(dev);
+                if (ret)
+                        return ret;
+        }
 
         NV_INFO(drm, "evicting buffers...\n");
         ttm_bo_evict_mm(&drm->ttm.bdev, TTM_PL_VRAM);
@@ -445,8 +449,10 @@ fail_client:
                 nouveau_client_init(&cli->base);
         }
 
-        NV_INFO(drm, "resuming display...\n");
-        nouveau_display_resume(dev);
+        if (dev->mode_config.num_crtc) {
+                NV_INFO(drm, "resuming display...\n");
+                nouveau_display_resume(dev);
+        }
         return ret;
 }
 
@@ -486,8 +492,10 @@ nouveau_drm_resume(struct pci_dev *pdev)
         nouveau_irq_postinstall(dev);
         nouveau_pm_resume(dev);
 
-        NV_INFO(drm, "resuming display...\n");
-        nouveau_display_resume(dev);
+        if (dev->mode_config.num_crtc) {
+                NV_INFO(drm, "resuming display...\n");
+                nouveau_display_resume(dev);
+        }
         return 0;
 }
 
diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.h b/drivers/gpu/drm/nouveau/nouveau_drm.h
index 819471217546..a10169927086 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drm.h
+++ b/drivers/gpu/drm/nouveau/nouveau_drm.h
@@ -141,4 +141,6 @@ int nouveau_drm_resume(struct pci_dev *);
                 nv_info((cli), fmt, ##args);                                   \
 } while (0)
 
+extern int nouveau_modeset;
+
 #endif
diff --git a/drivers/gpu/drm/nouveau/nouveau_irq.c b/drivers/gpu/drm/nouveau/nouveau_irq.c
index 9ca8afdb5549..1d8cb506a28a 100644
--- a/drivers/gpu/drm/nouveau/nouveau_irq.c
+++ b/drivers/gpu/drm/nouveau/nouveau_irq.c
@@ -61,13 +61,15 @@ nouveau_irq_handler(DRM_IRQ_ARGS)
 
         nv_subdev(pmc)->intr(nv_subdev(pmc));
 
-        if (device->card_type >= NV_D0) {
-                if (nv_rd32(device, 0x000100) & 0x04000000)
-                        nvd0_display_intr(dev);
-        } else
-        if (device->card_type >= NV_50) {
-                if (nv_rd32(device, 0x000100) & 0x04000000)
-                        nv50_display_intr(dev);
+        if (dev->mode_config.num_crtc) {
+                if (device->card_type >= NV_D0) {
+                        if (nv_rd32(device, 0x000100) & 0x04000000)
+                                nvd0_display_intr(dev);
+                } else
+                if (device->card_type >= NV_50) {
+                        if (nv_rd32(device, 0x000100) & 0x04000000)
+                                nv50_display_intr(dev);
+                }
         }
 
         return IRQ_HANDLED;