drm/nouveau: resurrect headless mode since rework

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

diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index d2f8ffe..0185837 100644 (file)
--- 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 ccae8c2..9cc83f1 100644 (file)
--- 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 8194712..a101699 100644 (file)
--- 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 9ca8afd..1d8cb50 100644 (file)
--- 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;