staging: drm/omap: add drm_plane support

Because framebuffer layer and overlay scanout video pipes are basically
thing in OMAP display subsystem (the only difference being that the first
video pipe does not support scaling or YUV formats), much of the CRTC
code is pulled into the plane implementation, and a private plane object
is used by the CRTC object.  This avoids code duplication between the
plane and CRTC.

Signed-off-by: Rob Clark <rob@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/omapdrm/Makefile

@@ -7,6 +7,7 @@ ccflags-y := -Iinclude/drm -Werror
 omapdrm-y := omap_drv.o \
 	omap_debugfs.o \
 	omap_crtc.o \
+	omap_plane.o \
 	omap_encoder.o \
 	omap_connector.o \
 	omap_fb.o \

drivers/staging/omapdrm/omap_crtc.c

@@ -27,196 +27,95 @@
 
 struct omap_crtc {
 	struct drm_crtc base;
-	struct omap_overlay *ovl;
-	struct omap_overlay_info info;
+	struct drm_plane *plane;
+	const char *name;
 	int id;
 
-	/* if there is a pending flip, this will be non-null: */
+	/* if there is a pending flip, these will be non-null: */
 	struct drm_pending_vblank_event *event;
+	struct drm_framebuffer *old_fb;
 };
 
-/* push changes down to dss2 */
-static int commit(struct drm_crtc *crtc)
-{
-	struct drm_device *dev = crtc->dev;
-	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
-	struct omap_overlay *ovl = omap_crtc->ovl;
-	struct omap_overlay_info *info = &omap_crtc->info;
-	int ret;
-
-	DBG("%s", omap_crtc->ovl->name);
-	DBG("%dx%d -> %dx%d (%d)", info->width, info->height, info->out_width,
-			info->out_height, info->screen_width);
-	DBG("%d,%d %08x", info->pos_x, info->pos_y, info->paddr);
-
-	/* NOTE: do we want to do this at all here, or just wait
-	 * for dpms(ON) since other CRTC's may not have their mode
-	 * set yet, so fb dimensions may still change..
-	 */
-	ret = ovl->set_overlay_info(ovl, info);
-	if (ret) {
-		dev_err(dev->dev, "could not set overlay info\n");
-		return ret;
-	}
-
-	/* our encoder doesn't necessarily get a commit() after this, in
-	 * particular in the dpms() and mode_set_base() cases, so force the
-	 * manager to update:
-	 *
-	 * could this be in the encoder somehow?
-	 */
-	if (ovl->manager) {
-		ret = ovl->manager->apply(ovl->manager);
-		if (ret) {
-			dev_err(dev->dev, "could not apply settings\n");
-			return ret;
-		}
-	}
-
-	if (info->enabled) {
-		omap_framebuffer_flush(crtc->fb, crtc->x, crtc->y,
-				crtc->fb->width, crtc->fb->height);
-	}
-
-	return 0;
-}
-
-/* update parameters that are dependent on the framebuffer dimensions and
- * position within the fb that this crtc scans out from. This is called
- * when framebuffer dimensions or x,y base may have changed, either due
- * to our mode, or a change in another crtc that is scanning out of the
- * same fb.
- */
-static void update_scanout(struct drm_crtc *crtc)
-{
-	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
-	dma_addr_t paddr;
-	unsigned int screen_width;
-
-	omap_framebuffer_get_buffer(crtc->fb, crtc->x, crtc->y,
-			NULL, &paddr, &screen_width);
-
-	DBG("%s: %d,%d: %08x (%d)", omap_crtc->ovl->name,
-			crtc->x, crtc->y, (u32)paddr, screen_width);
-
-	omap_crtc->info.paddr = paddr;
-	omap_crtc->info.screen_width = screen_width;
-}
-
 static void omap_crtc_gamma_set(struct drm_crtc *crtc,
 		u16 *red, u16 *green, u16 *blue, uint32_t start, uint32_t size)
 {
-	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
-	DBG("%s", omap_crtc->ovl->name);
+	/* not supported.. at least not yet */
 }
 
 static void omap_crtc_destroy(struct drm_crtc *crtc)
 {
 	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
-	DBG("%s", omap_crtc->ovl->name);
+	omap_crtc->plane->funcs->destroy(omap_crtc->plane);
 	drm_crtc_cleanup(crtc);
 	kfree(omap_crtc);
 }
 
 static void omap_crtc_dpms(struct drm_crtc *crtc, int mode)
 {
+	struct omap_drm_private *priv = crtc->dev->dev_private;
 	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
+	int i;
 
-	DBG("%s: %d", omap_crtc->ovl->name, mode);
+	WARN_ON(omap_plane_dpms(omap_crtc->plane, mode));
 
-	if (mode == DRM_MODE_DPMS_ON) {
-		update_scanout(crtc);
-		omap_crtc->info.enabled = true;
-	} else {
-		omap_crtc->info.enabled = false;
+	for (i = 0; i < priv->num_planes; i++) {
+		struct drm_plane *plane = priv->planes[i];
+		if (plane->crtc == crtc)
+			WARN_ON(omap_plane_dpms(plane, mode));
 	}
-
-	WARN_ON(commit(crtc));
 }
 
 static bool omap_crtc_mode_fixup(struct drm_crtc *crtc,
-				  struct drm_display_mode *mode,
-				  struct drm_display_mode *adjusted_mode)
+		struct drm_display_mode *mode,
+		struct drm_display_mode *adjusted_mode)
 {
-	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
-	DBG("%s", omap_crtc->ovl->name);
 	return true;
 }
 
 static int omap_crtc_mode_set(struct drm_crtc *crtc,
-			       struct drm_display_mode *mode,
-			       struct drm_display_mode *adjusted_mode,
-			       int x, int y,
-			       struct drm_framebuffer *old_fb)
+		struct drm_display_mode *mode,
+		struct drm_display_mode *adjusted_mode,
+		int x, int y,
+		struct drm_framebuffer *old_fb)
 {
 	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
+	struct drm_plane *plane = omap_crtc->plane;
 
-	DBG("%s: %d,%d: %dx%d", omap_crtc->ovl->name, x, y,
-			mode->hdisplay, mode->vdisplay);
-
-	/* just use adjusted mode */
-	mode = adjusted_mode;
-
-	omap_crtc->info.width = mode->hdisplay;
-	omap_crtc->info.height = mode->vdisplay;
-	omap_crtc->info.out_width = mode->hdisplay;
-	omap_crtc->info.out_height = mode->vdisplay;
-	omap_crtc->info.color_mode = OMAP_DSS_COLOR_RGB24U;
-	omap_crtc->info.rotation_type = OMAP_DSS_ROT_DMA;
-	omap_crtc->info.rotation = OMAP_DSS_ROT_0;
-	omap_crtc->info.global_alpha = 0xff;
-	omap_crtc->info.mirror = 0;
-	omap_crtc->info.mirror = 0;
-	omap_crtc->info.pos_x = 0;
-	omap_crtc->info.pos_y = 0;
-#if 0 /* re-enable when these are available in DSS2 driver */
-	omap_crtc->info.zorder = 3;        /* GUI in the front, video behind */
-	omap_crtc->info.min_x_decim = 1;
-	omap_crtc->info.max_x_decim = 1;
-	omap_crtc->info.min_y_decim = 1;
-	omap_crtc->info.max_y_decim = 1;
-#endif
-
-	update_scanout(crtc);
-
-	return 0;
+	return plane->funcs->update_plane(plane, crtc, crtc->fb,
+			0, 0, mode->hdisplay, mode->vdisplay,
+			x << 16, y << 16,
+			mode->hdisplay << 16, mode->vdisplay << 16);
 }
 
 static void omap_crtc_prepare(struct drm_crtc *crtc)
 {
 	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
-	struct omap_overlay *ovl = omap_crtc->ovl;
-
-	DBG("%s", omap_crtc->ovl->name);
-
-	ovl->get_overlay_info(ovl, &omap_crtc->info);
-
+	DBG("%s", omap_crtc->name);
 	omap_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
 }
 
 static void omap_crtc_commit(struct drm_crtc *crtc)
 {
 	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
-	DBG("%s", omap_crtc->ovl->name);
+	DBG("%s", omap_crtc->name);
 	omap_crtc_dpms(crtc, DRM_MODE_DPMS_ON);
 }
 
 static int omap_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
-		    struct drm_framebuffer *old_fb)
+		struct drm_framebuffer *old_fb)
 {
 	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
+	struct drm_plane *plane = omap_crtc->plane;
+	struct drm_display_mode *mode = &crtc->mode;
 
-	DBG("%s %d,%d: fb=%p", omap_crtc->ovl->name, x, y, old_fb);
-
-	update_scanout(crtc);
-
-	return commit(crtc);
+	return plane->funcs->update_plane(plane, crtc, crtc->fb,
+			0, 0, mode->hdisplay, mode->vdisplay,
+			x << 16, y << 16,
+			mode->hdisplay << 16, mode->vdisplay << 16);
 }
 
 static void omap_crtc_load_lut(struct drm_crtc *crtc)
 {
-	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
-	DBG("%s", omap_crtc->ovl->name);
 }
 
 static void page_flip_cb(void *arg)
@@ -225,15 +124,16 @@ static void page_flip_cb(void *arg)
 	struct drm_device *dev = crtc->dev;
 	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 	struct drm_pending_vblank_event *event = omap_crtc->event;
+	struct drm_framebuffer *old_fb = omap_crtc->old_fb;
 	struct timeval now;
 	unsigned long flags;
 
 	WARN_ON(!event);
 
 	omap_crtc->event = NULL;
+	omap_crtc->old_fb = NULL;
 
-	update_scanout(crtc);
-	WARN_ON(commit(crtc));
+	omap_crtc_mode_set_base(crtc, crtc->x, crtc->y, old_fb);
 
 	/* wakeup userspace */
 	/* TODO: this should happen *after* flip in vsync IRQ handler */
@@ -264,8 +164,9 @@ static int omap_crtc_page_flip_locked(struct drm_crtc *crtc,
 		return -EINVAL;
 	}
 
-	crtc->fb = fb;
+	omap_crtc->old_fb = crtc->fb;
 	omap_crtc->event = event;
+	crtc->fb = fb;
 
 	omap_gem_op_async(omap_framebuffer_bo(fb), OMAP_GEM_READ,
 			page_flip_cb, crtc);
@@ -290,12 +191,6 @@ static const struct drm_crtc_helper_funcs omap_crtc_helper_funcs = {
 	.load_lut = omap_crtc_load_lut,
 };
 
-struct omap_overlay *omap_crtc_get_overlay(struct drm_crtc *crtc)
-{
-	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
-	return omap_crtc->ovl;
-}
-
 /* initialize crtc */
 struct drm_crtc *omap_crtc_init(struct drm_device *dev,
 		struct omap_overlay *ovl, int id)
@@ -310,9 +205,13 @@ struct drm_crtc *omap_crtc_init(struct drm_device *dev,
 		goto fail;
 	}
 
-	omap_crtc->ovl = ovl;
-	omap_crtc->id = id;
 	crtc = &omap_crtc->base;
+
+	omap_crtc->plane = omap_plane_init(dev, ovl, (1 << id), true);
+	omap_crtc->plane->crtc = crtc;
+	omap_crtc->name = ovl->name;
+	omap_crtc->id = id;
+
 	drm_crtc_init(dev, crtc, &omap_crtc_funcs);
 	drm_crtc_helper_add(crtc, &omap_crtc_helper_funcs);
 

drivers/staging/omapdrm/omap_drv.c

@@ -204,12 +204,6 @@ static int create_crtc(struct drm_device *dev, struct omap_overlay *ovl,
 	struct omap_overlay_manager *mgr = NULL;
 	struct drm_crtc *crtc;
 
-	if (ovl->manager) {
-		DBG("disconnecting %s from %s", ovl->name,
-					ovl->manager->name);
-		ovl->unset_manager(ovl);
-	}
-
 	/* find next best connector, ones with detected connection first
 	 */
 	while (*j < priv->num_connectors && !mgr) {
@@ -245,11 +239,6 @@ static int create_crtc(struct drm_device *dev, struct omap_overlay *ovl,
 		(*j)++;
 	}
 
-	if (mgr) {
-		DBG("connecting %s to %s", ovl->name, mgr->name);
-		ovl->set_manager(ovl, mgr);
-	}
-
 	crtc = omap_crtc_init(dev, ovl, priv->num_crtcs);
 
 	if (!crtc) {
@@ -265,6 +254,26 @@ static int create_crtc(struct drm_device *dev, struct omap_overlay *ovl,
 	return 0;
 }
 
+static int create_plane(struct drm_device *dev, struct omap_overlay *ovl,
+		unsigned int possible_crtcs)
+{
+	struct omap_drm_private *priv = dev->dev_private;
+	struct drm_plane *plane =
+			omap_plane_init(dev, ovl, possible_crtcs, false);
+
+	if (!plane) {
+		dev_err(dev->dev, "could not create plane: %s\n",
+				ovl->name);
+		return -ENOMEM;
+	}
+
+	BUG_ON(priv->num_planes >= ARRAY_SIZE(priv->planes));
+
+	priv->planes[priv->num_planes++] = plane;
+
+	return 0;
+}
+
 static int match_dev_name(struct omap_dss_device *dssdev, void *data)
 {
 	return !strcmp(dssdev->name, data);
@@ -332,6 +341,12 @@ static int omap_modeset_init(struct drm_device *dev)
 				omap_dss_get_overlay(kms_pdata->ovl_ids[i]);
 			create_crtc(dev, ovl, &j, connected_connectors);
 		}
+
+		for (i = 0; i < kms_pdata->pln_cnt; i++) {
+			struct omap_overlay *ovl =
+				omap_dss_get_overlay(kms_pdata->pln_ids[i]);
+			create_plane(dev, ovl, (1 << priv->num_crtcs) - 1);
+		}
 	} else {
 		/* otherwise just grab up to CONFIG_DRM_OMAP_NUM_CRTCS and try
 		 * to make educated guesses about everything else
@@ -353,6 +368,12 @@ static int omap_modeset_init(struct drm_device *dev)
 			create_crtc(dev, omap_dss_get_overlay(i),
 					&j, connected_connectors);
 		}
+
+		/* use any remaining overlays as drm planes */
+		for (; i < omap_dss_get_num_overlays(); i++) {
+			struct omap_overlay *ovl = omap_dss_get_overlay(i);
+			create_plane(dev, ovl, (1 << priv->num_crtcs) - 1);
+		}
 	}
 
 	/* for now keep the mapping of CRTCs and encoders static.. */
@@ -361,15 +382,7 @@ static int omap_modeset_init(struct drm_device *dev)
 		struct omap_overlay_manager *mgr =
 				omap_encoder_get_manager(encoder);
 
-		encoder->possible_crtcs = 0;
-
-		for (j = 0; j < priv->num_crtcs; j++) {
-			struct omap_overlay *ovl =
-					omap_crtc_get_overlay(priv->crtcs[j]);
-			if (ovl->manager == mgr) {
-				encoder->possible_crtcs |= (1 << j);
-			}
-		}
+		encoder->possible_crtcs = (1 << priv->num_crtcs) - 1;
 
 		DBG("%s: possible_crtcs=%08x", mgr->name,
 					encoder->possible_crtcs);

drivers/staging/omapdrm/omap_drv.h

@@ -42,6 +42,8 @@
 struct omap_drm_private {
 	unsigned int num_crtcs;
 	struct drm_crtc *crtcs[8];
+	unsigned int num_planes;
+	struct drm_plane *planes[8];
 	unsigned int num_encoders;
 	struct drm_encoder *encoders[8];
 	unsigned int num_connectors;
@@ -62,7 +64,11 @@ void omap_fbdev_free(struct drm_device *dev);
 
 struct drm_crtc *omap_crtc_init(struct drm_device *dev,
 		struct omap_overlay *ovl, int id);
-struct omap_overlay *omap_crtc_get_overlay(struct drm_crtc *crtc);
+
+struct drm_plane *omap_plane_init(struct drm_device *dev,
+		struct omap_overlay *ovl, unsigned int possible_crtcs,
+		bool priv);
+int omap_plane_dpms(struct drm_plane *plane, int mode);
 
 struct drm_encoder *omap_encoder_init(struct drm_device *dev,
 		struct omap_overlay_manager *mgr);

drivers/staging/omapdrm/omap_plane.c

@@ -0,0 +1,308 @@
+/*
+ * drivers/staging/omapdrm/omap_plane.c
+ *
+ * Copyright (C) 2011 Texas Instruments
+ * Author: Rob Clark <rob.clark@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "omap_drv.h"
+
+/* some hackery because omapdss has an 'enum omap_plane' (which would be
+ * better named omap_plane_id).. and compiler seems unhappy about having
+ * both a 'struct omap_plane' and 'enum omap_plane'
+ */
+#define omap_plane _omap_plane
+
+/*
+ * plane funcs
+ */
+
+#define to_omap_plane(x) container_of(x, struct omap_plane, base)
+
+struct omap_plane {
+	struct drm_plane base;
+	struct omap_overlay *ovl;
+	struct omap_overlay_info info;
+
+	/* Source values, converted to integers because we don't support
+	 * fractional positions:
+	 */
+	unsigned int src_x, src_y;
+};
+
+
+/* push changes down to dss2 */
+static int commit(struct drm_plane *plane)
+{
+	struct drm_device *dev = plane->dev;
+	struct omap_plane *omap_plane = to_omap_plane(plane);
+	struct omap_overlay *ovl = omap_plane->ovl;
+	struct omap_overlay_info *info = &omap_plane->info;
+	int ret;
+
+	DBG("%s", ovl->name);
+	DBG("%dx%d -> %dx%d (%d)", info->width, info->height, info->out_width,
+			info->out_height, info->screen_width);
+	DBG("%d,%d %08x", info->pos_x, info->pos_y, info->paddr);
+
+	/* NOTE: do we want to do this at all here, or just wait
+	 * for dpms(ON) since other CRTC's may not have their mode
+	 * set yet, so fb dimensions may still change..
+	 */
+	ret = ovl->set_overlay_info(ovl, info);
+	if (ret) {
+		dev_err(dev->dev, "could not set overlay info\n");
+		return ret;
+	}
+
+	/* our encoder doesn't necessarily get a commit() after this, in
+	 * particular in the dpms() and mode_set_base() cases, so force the
+	 * manager to update:
+	 *
+	 * could this be in the encoder somehow?
+	 */
+	if (ovl->manager) {
+		ret = ovl->manager->apply(ovl->manager);
+		if (ret) {
+			dev_err(dev->dev, "could not apply settings\n");
+			return ret;
+		}
+	}
+
+	if (info->enabled) {
+		omap_framebuffer_flush(plane->fb, info->pos_x, info->pos_y,
+				info->out_width, info->out_height);
+	}
+
+	return 0;
+}
+
+/* when CRTC that we are attached to has potentially changed, this checks
+ * if we are attached to proper manager, and if necessary updates.
+ */
+static void update_manager(struct drm_plane *plane)
+{
+	struct omap_drm_private *priv = plane->dev->dev_private;
+	struct omap_plane *omap_plane = to_omap_plane(plane);
+	struct omap_overlay *ovl = omap_plane->ovl;
+	struct omap_overlay_manager *mgr = NULL;
+	int i;
+
+	if (plane->crtc) {
+		for (i = 0; i < priv->num_encoders; i++) {
+			struct drm_encoder *encoder = priv->encoders[i];
+			if (encoder->crtc == plane->crtc) {
+				mgr = omap_encoder_get_manager(encoder);
+				break;
+			}
+		}
+	}
+
+	if (ovl->manager != mgr) {
+		bool enabled = omap_plane->info.enabled;
+
+		/* don't switch things around with enabled overlays: */
+		if (enabled)
+			omap_plane_dpms(plane, DRM_MODE_DPMS_OFF);
+
+		if (ovl->manager) {
+			DBG("disconnecting %s from %s", ovl->name,
+					ovl->manager->name);
+			ovl->unset_manager(ovl);
+		}
+
+		if (mgr) {
+			DBG("connecting %s to %s", ovl->name, mgr->name);
+			ovl->set_manager(ovl, mgr);
+		}
+
+		if (enabled && mgr)
+			omap_plane_dpms(plane, DRM_MODE_DPMS_ON);
+	}
+}
+
+/* update parameters that are dependent on the framebuffer dimensions and
+ * position within the fb that this plane scans out from. This is called
+ * when framebuffer or x,y base may have changed.
+ */
+static void update_scanout(struct drm_plane *plane)
+{
+	struct omap_plane *omap_plane = to_omap_plane(plane);
+	unsigned int screen_width; /* really means "pitch" */
+	dma_addr_t paddr;
+
+	omap_framebuffer_get_buffer(plane->fb,
+			omap_plane->src_x, omap_plane->src_y,
+			NULL, &paddr, &screen_width);
+
+	DBG("%s: %d,%d: %08x (%d)", omap_plane->ovl->name,
+			omap_plane->src_x, omap_plane->src_y,
+			(u32)paddr, screen_width);
+
+	omap_plane->info.paddr = paddr;
+	omap_plane->info.screen_width = screen_width;
+}
+
+static int omap_plane_update(struct drm_plane *plane,
+		struct drm_crtc *crtc, struct drm_framebuffer *fb,
+		int crtc_x, int crtc_y,
+		unsigned int crtc_w, unsigned int crtc_h,
+		uint32_t src_x, uint32_t src_y,
+		uint32_t src_w, uint32_t src_h)
+{
+	struct omap_plane *omap_plane = to_omap_plane(plane);
+
+	/* src values are in Q16 fixed point, convert to integer: */
+	src_x = src_x >> 16;
+	src_y = src_y >> 16;
+	src_w = src_w >> 16;
+	src_h = src_h >> 16;
+
+	omap_plane->info.enabled = true;
+	omap_plane->info.pos_x = crtc_x;
+	omap_plane->info.pos_y = crtc_y;
+	omap_plane->info.out_width = crtc_w;
+	omap_plane->info.out_height = crtc_h;
+	omap_plane->info.width = src_w;
+	omap_plane->info.height = src_h;
+	omap_plane->src_x = src_x;
+	omap_plane->src_y = src_y;
+
+	/* note: this is done after this fxn returns.. but if we need
+	 * to do a commit/update_scanout, etc before this returns we
+	 * need the current value.
+	 */
+	plane->fb = fb;
+	plane->crtc = crtc;
+
+	update_scanout(plane);
+	update_manager(plane);
+	commit(plane);
+
+	return 0;
+}
+
+static int omap_plane_disable(struct drm_plane *plane)
+{
+	return omap_plane_dpms(plane, DRM_MODE_DPMS_OFF);
+}
+
+static void omap_plane_destroy(struct drm_plane *plane)
+{
+	struct omap_plane *omap_plane = to_omap_plane(plane);
+	DBG("%s", omap_plane->ovl->name);
+	omap_plane_disable(plane);
+	drm_plane_cleanup(plane);
+	kfree(omap_plane);
+}
+
+int omap_plane_dpms(struct drm_plane *plane, int mode)
+{
+	struct omap_plane *omap_plane = to_omap_plane(plane);
+
+	DBG("%s: %d", omap_plane->ovl->name, mode);
+
+	if (mode == DRM_MODE_DPMS_ON) {
+		update_scanout(plane);
+		omap_plane->info.enabled = true;
+	} else {
+		omap_plane->info.enabled = false;
+	}
+
+	return commit(plane);
+}
+
+static const struct drm_plane_funcs omap_plane_funcs = {
+		.update_plane = omap_plane_update,
+		.disable_plane = omap_plane_disable,
+		.destroy = omap_plane_destroy,
+};
+
+static const uint32_t formats[] = {
+		DRM_FORMAT_RGB565,
+		DRM_FORMAT_RGBX4444,
+		DRM_FORMAT_XRGB4444,
+		DRM_FORMAT_RGBA4444,
+		DRM_FORMAT_ABGR4444,
+		DRM_FORMAT_XRGB1555,
+		DRM_FORMAT_ARGB1555,
+		DRM_FORMAT_RGB888,
+		DRM_FORMAT_RGBX8888,
+		DRM_FORMAT_XRGB8888,
+		DRM_FORMAT_RGBA8888,
+		DRM_FORMAT_ARGB8888,
+		DRM_FORMAT_NV12,
+		DRM_FORMAT_YUYV,
+		DRM_FORMAT_UYVY,
+};
+
+/* initialize plane */
+struct drm_plane *omap_plane_init(struct drm_device *dev,
+		struct omap_overlay *ovl, unsigned int possible_crtcs,
+		bool priv)
+{
+	struct drm_plane *plane = NULL;
+	struct omap_plane *omap_plane;
+
+	DBG("%s: possible_crtcs=%08x, priv=%d", ovl->name,
+			possible_crtcs, priv);
+
+	omap_plane = kzalloc(sizeof(*omap_plane), GFP_KERNEL);
+	if (!omap_plane) {
+		dev_err(dev->dev, "could not allocate plane\n");
+		goto fail;
+	}
+
+	omap_plane->ovl = ovl;
+	plane = &omap_plane->base;
+
+	drm_plane_init(dev, plane, possible_crtcs, &omap_plane_funcs,
+			formats, ARRAY_SIZE(formats), priv);
+
+	/* get our starting configuration, set defaults for parameters
+	 * we don't currently use, etc:
+	 */
+	ovl->get_overlay_info(ovl, &omap_plane->info);
+	omap_plane->info.rotation_type = OMAP_DSS_ROT_DMA;
+	omap_plane->info.rotation = OMAP_DSS_ROT_0;
+	omap_plane->info.global_alpha = 0xff;
+	omap_plane->info.mirror = 0;
+	omap_plane->info.mirror = 0;
+
+	/* Set defaults depending on whether we are a CRTC or overlay
+	 * layer.
+	 * TODO add ioctl to give userspace an API to change this.. this
+	 * will come in a subsequent patch.
+	 */
+	if (priv)
+		omap_plane->info.zorder = 0;
+	else
+		omap_plane->info.zorder = 1;
+
+	/* TODO color mode should come from fb.. this will come in a
+	 * subsequent patch
+	 */
+	omap_plane->info.color_mode = OMAP_DSS_COLOR_RGB24U;
+
+	update_manager(plane);
+
+	return plane;
+
+fail:
+	if (plane) {
+		omap_plane_destroy(plane);
+	}
+	return NULL;
+}

drivers/staging/omapdrm/omap_priv.h

@@ -27,14 +27,22 @@
  * pipes/overlays/CRTCs are used.. if this is not provided, then instead the
  * first CONFIG_DRM_OMAP_NUM_CRTCS are used, and they are each connected to
  * one manager, with priority given to managers that are connected to
- * detected devices.  This should be a good default behavior for most cases,
- * but yet there still might be times when you wish to do something different.
+ * detected devices.  Remaining overlays are used as video planes.  This
+ * should be a good default behavior for most cases, but yet there still
+ * might be times when you wish to do something different.
  */
 struct omap_kms_platform_data {
+	/* overlays to use as CRTCs: */
 	int ovl_cnt;
 	const int *ovl_ids;
+
+	/* overlays to use as video planes: */
+	int pln_cnt;
+	const int *pln_ids;
+
 	int mgr_cnt;
 	const int *mgr_ids;
+
 	int dev_cnt;
 	const char **dev_names;
 };