From: Rob Clark robdclark@gmail.com
Add an atomic helper to implement dirtyfb support. This is needed to support DSI command-mode panels with x11 userspace (ie. when we can't rely on pageflips to trigger a flush to the panel).
v2: Modified the helper to use plane fb_damage_clips property and removed plane_state::dirty flag.
v3: - Use uapi drm_mode_rect. - Support annotate flags.
Cc: ville.syrjala@linux.intel.com Cc: Daniel Vetter daniel.vetter@ffwll.ch Cc: Pekka Paalanen ppaalanen@gmail.com Signed-off-by: Rob Clark robdclark@gmail.com Signed-off-by: Deepak Rawat drawat@vmware.com --- drivers/gpu/drm/drm_damage_helper.c | 121 ++++++++++++++++++++++++++++ include/drm/drm_damage_helper.h | 4 + 2 files changed, 125 insertions(+)
diff --git a/drivers/gpu/drm/drm_damage_helper.c b/drivers/gpu/drm/drm_damage_helper.c index bc734ddaf180..ecf26275543f 100644 --- a/drivers/gpu/drm/drm_damage_helper.c +++ b/drivers/gpu/drm/drm_damage_helper.c @@ -26,6 +26,7 @@ * * Authors: * Deepak Rawat drawat@vmware.com + * Rob Clark robdclark@gmail.com * **************************************************************************/
@@ -70,6 +71,21 @@ * rectangles clipped to &drm_plane_state.src. */
+static void convert_clip_rect_to_rect(const struct drm_clip_rect *src, + struct drm_mode_rect *dest, + uint32_t num_clips, uint32_t src_inc) +{ + while (num_clips > 0) { + dest->x1 = src->x1; + dest->y1 = src->y1; + dest->x2 = src->x2; + dest->y2 = src->y2; + src += src_inc; + dest++; + num_clips--; + } +} + /** * drm_plane_enable_fb_damage_clips - Enables plane fb damage clips property. * @plane: Plane on which to enable damage clips property. @@ -123,6 +139,111 @@ void drm_atomic_helper_check_plane_damage(struct drm_atomic_state *state, } EXPORT_SYMBOL(drm_atomic_helper_check_plane_damage);
+/** + * drm_atomic_helper_dirtyfb - Helper for dirtyfb. + * @fb: DRM framebuffer. + * @file_priv: Drm file for the ioctl call. + * @flags: Dirty fb annotate flags. + * @color: Color for annotate fill. + * @clips: Dirty region. + * @num_clips: Count of clip in clips. + * + * A helper to implement &drm_framebuffer_funcs::dirty using damage interface + * during plane update. Similar to ioctl, this helper do a full plane update + * when no clips are provided. + * + * Returns: Zero on success, negative errno on failure. + */ +int drm_atomic_helper_dirtyfb(struct drm_framebuffer *fb, + struct drm_file *file_priv, unsigned flags, + unsigned color, struct drm_clip_rect *clips, + unsigned num_clips) +{ + struct drm_modeset_acquire_ctx ctx; + struct drm_property_blob *damage = NULL; + struct drm_mode_rect *rects = NULL; + struct drm_atomic_state *state; + struct drm_plane *plane; + int ret = 0; + + /* + * When called from ioctl, we are interruptable, but not when called + * internally (ie. defio worker) + */ + drm_modeset_acquire_init(&ctx, + file_priv ? DRM_MODESET_ACQUIRE_INTERRUPTIBLE : 0); + + state = drm_atomic_state_alloc(fb->dev); + if (!state) { + ret = -ENOMEM; + goto out; + } + state->acquire_ctx = &ctx; + + if (clips) { + uint32_t inc = 1; + + if (flags & DRM_MODE_FB_DIRTY_ANNOTATE_COPY) { + inc = 2; + num_clips /= 2; + } + + rects = kcalloc(num_clips, sizeof(*rects), GFP_KERNEL); + if (!rects) { + ret = -ENOMEM; + goto out; + } + + convert_clip_rect_to_rect(clips, rects, num_clips, inc); + damage = drm_property_create_blob(fb->dev, + num_clips * sizeof(*rects), + rects); + if (IS_ERR(damage)) { + ret = PTR_ERR(damage); + damage = NULL; + goto out; + } + } + +retry: + drm_for_each_plane(plane, fb->dev) { + struct drm_plane_state *plane_state; + + if (plane->state->fb != fb) + continue; + + plane_state = drm_atomic_get_plane_state(state, plane); + if (IS_ERR(plane_state)) { + ret = PTR_ERR(plane_state); + goto out; + } + + drm_property_replace_blob(&plane_state->fb_damage_clips, + damage); + } + + ret = drm_atomic_commit(state); + +out: + if (ret == -EDEADLK) { + drm_atomic_state_clear(state); + ret = drm_modeset_backoff(&ctx); + if (!ret) + goto retry; + } + + drm_property_blob_put(damage); + kfree(rects); + drm_atomic_state_put(state); + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); + + return ret; + +} +EXPORT_SYMBOL(drm_atomic_helper_dirtyfb); + /** * drm_atomic_helper_damage_iter_init - Initialize the damage iterator. * @iter: The iterator to initialize. diff --git a/include/drm/drm_damage_helper.h b/include/drm/drm_damage_helper.h index af188799820f..e4fe7036cab2 100644 --- a/include/drm/drm_damage_helper.h +++ b/include/drm/drm_damage_helper.h @@ -67,6 +67,10 @@ struct drm_atomic_helper_damage_iter { void drm_plane_enable_fb_damage_clips(struct drm_plane *plane); void drm_atomic_helper_check_plane_damage(struct drm_atomic_state *state, struct drm_plane_state *plane_state); +int drm_atomic_helper_dirtyfb(struct drm_framebuffer *fb, + struct drm_file *file_priv, unsigned flags, + unsigned color, struct drm_clip_rect *clips, + unsigned num_clips); void drm_atomic_helper_damage_iter_init(struct drm_atomic_helper_damage_iter *iter, const struct drm_plane_state *old_state,