diff options
author | Benoit Parrot <bparrot@ti.com> | 2021-11-17 15:19:26 +0100 |
---|---|---|
committer | Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> | 2021-12-08 10:04:47 +0200 |
commit | 2e54ff0e5430883f2040450e9297ebad9f56f846 (patch) | |
tree | d52a4b8164cad5be78cad055cf5109e8cb337408 /drivers/gpu/drm/omapdrm/omap_overlay.c | |
parent | 6e42201b0ed5d3af66c107144fcd96c17afbc6f1 (diff) |
drm/omap: dynamically assign hw overlays to planes
(re)assign the hw overlays to planes based on required caps, and to
handle situations where we could not modify an in-use plane.
This means all planes advertise the superset of formats and properties.
Userspace must (as always) use atomic TEST_ONLY step for atomic updates,
as not all planes may be available for use on every frame.
The mapping of hwoverlays to plane is stored in omap_global_state, so
that state updates are atomically committed in the same way that
plane/etc state updates are managed. This is needed because the
omap_plane_state keeps a pointer to the hwoverlay, and we don't want
global state to become out of sync with the plane state if an atomic
update fails, we hit deadlock/ backoff scenario, etc. The use of
global_state_lock keeps multiple parallel updates which both re-assign
hwoverlays properly serialized.
Signed-off-by: Benoit Parrot <bparrot@ti.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211117141928.771082-8-narmstrong@baylibre.com
Diffstat (limited to 'drivers/gpu/drm/omapdrm/omap_overlay.c')
-rw-r--r-- | drivers/gpu/drm/omapdrm/omap_overlay.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/drivers/gpu/drm/omapdrm/omap_overlay.c b/drivers/gpu/drm/omapdrm/omap_overlay.c index de67b39529bd..afb2b44fdf86 100644 --- a/drivers/gpu/drm/omapdrm/omap_overlay.c +++ b/drivers/gpu/drm/omapdrm/omap_overlay.c @@ -21,6 +21,115 @@ static const char * const overlay_id_to_name[] = { [OMAP_DSS_VIDEO3] = "vid3", }; +/* + * Find a free overlay with the required caps and supported fourcc + */ +static struct omap_hw_overlay * +omap_plane_find_free_overlay(struct drm_device *dev, struct drm_plane *hwoverlay_to_plane[], + u32 caps, u32 fourcc) +{ + struct omap_drm_private *priv = dev->dev_private; + int i; + + DBG("caps: %x fourcc: %x", caps, fourcc); + + for (i = 0; i < priv->num_ovls; i++) { + struct omap_hw_overlay *cur = priv->overlays[i]; + + DBG("%d: id: %d cur->caps: %x", + cur->idx, cur->id, cur->caps); + + /* skip if already in-use */ + if (hwoverlay_to_plane[cur->idx]) + continue; + + /* skip if doesn't support some required caps: */ + if (caps & ~cur->caps) + continue; + + /* check supported format */ + if (!dispc_ovl_color_mode_supported(priv->dispc, + cur->id, fourcc)) + continue; + + return cur; + } + + DBG("no match"); + return NULL; +} + +/* + * Assign a new overlay to a plane with the required caps and supported fourcc + * If a plane need a new overlay, the previous one should have been released + * with omap_overlay_release() + * This should be called from the plane atomic_check() in order to prepare the + * next global overlay_map to be enabled when atomic transaction is valid. + */ +int omap_overlay_assign(struct drm_atomic_state *s, struct drm_plane *plane, + u32 caps, u32 fourcc, struct omap_hw_overlay **overlay) +{ + /* Get the global state of the current atomic transaction */ + struct omap_global_state *state = omap_get_global_state(s); + struct drm_plane **overlay_map = state->hwoverlay_to_plane; + struct omap_hw_overlay *ovl; + + ovl = omap_plane_find_free_overlay(s->dev, overlay_map, caps, fourcc); + if (!ovl) + return -ENOMEM; + + overlay_map[ovl->idx] = plane; + *overlay = ovl; + + DBG("%s: assign to plane %s caps %x", ovl->name, plane->name, caps); + + return 0; +} + +/* + * Release an overlay from a plane if the plane gets not visible or the plane + * need a new overlay if overlay caps changes. + * This should be called from the plane atomic_check() in order to prepare the + * next global overlay_map to be enabled when atomic transaction is valid. + */ +void omap_overlay_release(struct drm_atomic_state *s, struct omap_hw_overlay *overlay) +{ + /* Get the global state of the current atomic transaction */ + struct omap_global_state *state = omap_get_global_state(s); + struct drm_plane **overlay_map = state->hwoverlay_to_plane; + + if (!overlay) + return; + + if (WARN_ON(!overlay_map[overlay->idx])) + return; + + DBG("%s: release from plane %s", overlay->name, overlay_map[overlay->idx]->name); + + overlay_map[overlay->idx] = NULL; +} + +/* + * Update an overlay state that was attached to a plane before the current atomic state. + * This should be called from the plane atomic_update() or atomic_disable(), + * where an overlay association to a plane could have changed between the old and current + * atomic state. + */ +void omap_overlay_update_state(struct omap_drm_private *priv, + struct omap_hw_overlay *overlay) +{ + struct omap_global_state *state = omap_get_existing_global_state(priv); + struct drm_plane **overlay_map = state->hwoverlay_to_plane; + + /* Check if this overlay is not used anymore, then disable it */ + if (!overlay_map[overlay->idx]) { + DBG("%s: disabled", overlay->name); + + /* disable the overlay */ + dispc_ovl_enable(priv->dispc, overlay->id, false); + } +} + static void omap_overlay_destroy(struct omap_hw_overlay *overlay) { kfree(overlay); |