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path: root/drivers/gpu/drm/omapdrm/omap_overlay.c
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Diffstat (limited to 'drivers/gpu/drm/omapdrm/omap_overlay.c')
-rw-r--r--drivers/gpu/drm/omapdrm/omap_overlay.c211
1 files changed, 211 insertions, 0 deletions
diff --git a/drivers/gpu/drm/omapdrm/omap_overlay.c b/drivers/gpu/drm/omapdrm/omap_overlay.c
new file mode 100644
index 000000000..fb97c7438
--- /dev/null
+++ b/drivers/gpu/drm/omapdrm/omap_overlay.c
@@ -0,0 +1,211 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
+ * Author: Benoit Parrot <bparrot@ti.com>
+ */
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+
+#include "omap_dmm_tiler.h"
+#include "omap_drv.h"
+
+/*
+ * overlay funcs
+ */
+static const char * const overlay_id_to_name[] = {
+ [OMAP_DSS_GFX] = "gfx",
+ [OMAP_DSS_VIDEO1] = "vid1",
+ [OMAP_DSS_VIDEO2] = "vid2",
+ [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,
+ struct omap_hw_overlay **r_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, *r_ovl;
+
+ ovl = omap_plane_find_free_overlay(s->dev, overlay_map, caps, fourcc);
+ if (!ovl)
+ return -ENOMEM;
+
+ overlay_map[ovl->idx] = plane;
+ *overlay = ovl;
+
+ if (r_overlay) {
+ r_ovl = omap_plane_find_free_overlay(s->dev, overlay_map,
+ caps, fourcc);
+ if (!r_ovl) {
+ overlay_map[ovl->idx] = NULL;
+ *overlay = NULL;
+ return -ENOMEM;
+ }
+
+ overlay_map[r_ovl->idx] = plane;
+ *r_overlay = r_ovl;
+ }
+
+ DBG("%s: assign to plane %s caps %x", ovl->name, plane->name, caps);
+
+ if (r_overlay) {
+ DBG("%s: assign to right of plane %s caps %x",
+ r_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);
+}
+
+static struct omap_hw_overlay *omap_overlay_init(enum omap_plane_id overlay_id,
+ enum omap_overlay_caps caps)
+{
+ struct omap_hw_overlay *overlay;
+
+ overlay = kzalloc(sizeof(*overlay), GFP_KERNEL);
+ if (!overlay)
+ return ERR_PTR(-ENOMEM);
+
+ overlay->name = overlay_id_to_name[overlay_id];
+ overlay->id = overlay_id;
+ overlay->caps = caps;
+
+ return overlay;
+}
+
+int omap_hwoverlays_init(struct omap_drm_private *priv)
+{
+ static const enum omap_plane_id hw_plane_ids[] = {
+ OMAP_DSS_GFX, OMAP_DSS_VIDEO1,
+ OMAP_DSS_VIDEO2, OMAP_DSS_VIDEO3,
+ };
+ u32 num_overlays = dispc_get_num_ovls(priv->dispc);
+ enum omap_overlay_caps caps;
+ int i, ret;
+
+ for (i = 0; i < num_overlays; i++) {
+ struct omap_hw_overlay *overlay;
+
+ caps = dispc_ovl_get_caps(priv->dispc, hw_plane_ids[i]);
+ overlay = omap_overlay_init(hw_plane_ids[i], caps);
+ if (IS_ERR(overlay)) {
+ ret = PTR_ERR(overlay);
+ dev_err(priv->dev, "failed to construct overlay for %s (%d)\n",
+ overlay_id_to_name[i], ret);
+ omap_hwoverlays_destroy(priv);
+ return ret;
+ }
+ overlay->idx = priv->num_ovls;
+ priv->overlays[priv->num_ovls++] = overlay;
+ }
+
+ return 0;
+}
+
+void omap_hwoverlays_destroy(struct omap_drm_private *priv)
+{
+ int i;
+
+ for (i = 0; i < priv->num_ovls; i++) {
+ omap_overlay_destroy(priv->overlays[i]);
+ priv->overlays[i] = NULL;
+ }
+
+ priv->num_ovls = 0;
+}