Merge tag 'drm-misc-fixes-2020-08-26' of git://anongit.freedesktop.org/drm/drm-misc into drm-fixes

Fixes for v5.9-rc2:
- Take modeset bkl for legacy drivers.
- Allow null crtc in dp_mst.
- Omap locking state fix.
Signed-off-by: Dave Airlie <airlied@redhat.com>

From: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/7af1e52a-27de-8edc-d0b2-e23b01e8bc96@linux.intel.com

drivers/gpu/drm/drm_atomic_helper.c

@@ -34,6 +34,7 @@
 #include <drm/drm_bridge.h>
 #include <drm/drm_damage_helper.h>
 #include <drm/drm_device.h>
+#include <drm/drm_drv.h>
 #include <drm/drm_plane_helper.h>
 #include <drm/drm_print.h>
 #include <drm/drm_self_refresh_helper.h>
@@ -3106,7 +3107,7 @@ void drm_atomic_helper_shutdown(struct drm_device *dev)
 	if (ret)
 		DRM_ERROR("Disabling all crtc's during unload failed with %i\n", ret);
 
-	DRM_MODESET_LOCK_ALL_END(ctx, ret);
+	DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
 }
 EXPORT_SYMBOL(drm_atomic_helper_shutdown);
 
@@ -3246,7 +3247,7 @@ struct drm_atomic_state *drm_atomic_helper_suspend(struct drm_device *dev)
 	}
 
 unlock:
-	DRM_MODESET_LOCK_ALL_END(ctx, err);
+	DRM_MODESET_LOCK_ALL_END(dev, ctx, err);
 	if (err)
 		return ERR_PTR(err);
 
@@ -3327,7 +3328,7 @@ int drm_atomic_helper_resume(struct drm_device *dev,
 
 	err = drm_atomic_helper_commit_duplicated_state(state, &ctx);
 
-	DRM_MODESET_LOCK_ALL_END(ctx, err);
+	DRM_MODESET_LOCK_ALL_END(dev, ctx, err);
 	drm_atomic_state_put(state);
 
 	return err;

drivers/gpu/drm/drm_color_mgmt.c

@@ -294,7 +294,7 @@ int drm_mode_gamma_set_ioctl(struct drm_device *dev,
 				     crtc->gamma_size, &ctx);
 
 out:
-	DRM_MODESET_LOCK_ALL_END(ctx, ret);
+	DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
 	return ret;
 
 }

drivers/gpu/drm/drm_crtc.c

@@ -588,7 +588,6 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data,
 	if (crtc_req->mode_valid && !drm_lease_held(file_priv, plane->base.id))
 		return -EACCES;
 
-	mutex_lock(&crtc->dev->mode_config.mutex);
 	DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx,
 				   DRM_MODESET_ACQUIRE_INTERRUPTIBLE, ret);
 
@@ -756,8 +755,7 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data,
 	fb = NULL;
 	mode = NULL;
 
-	DRM_MODESET_LOCK_ALL_END(ctx, ret);
-	mutex_unlock(&crtc->dev->mode_config.mutex);
+	DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
 
 	return ret;
 }

drivers/gpu/drm/drm_dp_mst_topology.c

@@ -5040,8 +5040,8 @@ int drm_dp_mst_add_affected_dsc_crtcs(struct drm_atomic_state *state, struct drm
 
 		crtc = conn_state->crtc;
 
-		if (WARN_ON(!crtc))
-			return -EINVAL;
+		if (!crtc)
+			continue;
 
 		if (!drm_dp_mst_dsc_aux_for_port(pos->port))
 			continue;

drivers/gpu/drm/drm_mode_object.c

@@ -428,7 +428,7 @@ int drm_mode_obj_get_properties_ioctl(struct drm_device *dev, void *data,
 out_unref:
 	drm_mode_object_put(obj);
 out:
-	DRM_MODESET_LOCK_ALL_END(ctx, ret);
+	DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
 	return ret;
 }
 
@@ -470,7 +470,7 @@ static int set_property_legacy(struct drm_mode_object *obj,
 		break;
 	}
 	drm_property_change_valid_put(prop, ref);
-	DRM_MODESET_LOCK_ALL_END(ctx, ret);
+	DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
 
 	return ret;
 }

drivers/gpu/drm/drm_plane.c

@@ -792,7 +792,7 @@ static int setplane_internal(struct drm_plane *plane,
 					  crtc_x, crtc_y, crtc_w, crtc_h,
 					  src_x, src_y, src_w, src_h, &ctx);
 
-	DRM_MODESET_LOCK_ALL_END(ctx, ret);
+	DRM_MODESET_LOCK_ALL_END(plane->dev, ctx, ret);
 
 	return ret;
 }

drivers/gpu/drm/omapdrm/omap_crtc.c

@@ -451,11 +451,12 @@ static void omap_crtc_atomic_enable(struct drm_crtc *crtc,
 	if (omap_state->manually_updated)
 		return;
 
-	spin_lock_irq(&crtc->dev->event_lock);
 	drm_crtc_vblank_on(crtc);
+
 	ret = drm_crtc_vblank_get(crtc);
 	WARN_ON(ret != 0);
 
+	spin_lock_irq(&crtc->dev->event_lock);
 	omap_crtc_arm_event(crtc);
 	spin_unlock_irq(&crtc->dev->event_lock);
 }

include/drm/drm_modeset_lock.h

@@ -164,6 +164,8 @@ int drm_modeset_lock_all_ctx(struct drm_device *dev,
  * is 0, so no error checking is necessary
  */
 #define DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, flags, ret)		\
+	if (!drm_drv_uses_atomic_modeset(dev))				\
+		mutex_lock(&dev->mode_config.mutex);			\
 	drm_modeset_acquire_init(&ctx, flags);				\
 modeset_lock_retry:							\
 	ret = drm_modeset_lock_all_ctx(dev, &ctx);			\
@@ -172,6 +174,7 @@ modeset_lock_retry:							\
 
 /**
  * DRM_MODESET_LOCK_ALL_END - Helper to release and cleanup modeset locks
+ * @dev: drm device
  * @ctx: local modeset acquire context, will be dereferenced
  * @ret: local ret/err/etc variable to track error status
  *
@@ -188,7 +191,7 @@ modeset_lock_retry:							\
  * to that failure. In both of these cases the code between BEGIN/END will not
  * be run, so the failure will reflect the inability to grab the locks.
  */
-#define DRM_MODESET_LOCK_ALL_END(ctx, ret)				\
+#define DRM_MODESET_LOCK_ALL_END(dev, ctx, ret)				\
 modeset_lock_fail:							\
 	if (ret == -EDEADLK) {						\
 		ret = drm_modeset_backoff(&ctx);			\
@@ -196,6 +199,8 @@ modeset_lock_fail:							\
 			goto modeset_lock_retry;			\
 	}								\
 	drm_modeset_drop_locks(&ctx);					\
-	drm_modeset_acquire_fini(&ctx);
+	drm_modeset_acquire_fini(&ctx);					\
+	if (!drm_drv_uses_atomic_modeset(dev))				\
+		mutex_unlock(&dev->mode_config.mutex);
 
 #endif /* DRM_MODESET_LOCK_H_ */