drm/omap: introduce omap_hw_overlay

Split out the hardware overlay specifics from omap_plane.
To start, the hw overlays are statically assigned to planes.

The goal is to eventually assign hw overlays dynamically to planes
during plane->atomic_check() based on requested caps (scaling, YUV,
etc). And then perform hw overlay re-assignment if required.

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/20211117141928.771082-5-narmstrong@baylibre.com

drivers/gpu/drm/omapdrm/Makefile

@@ -9,6 +9,7 @@ omapdrm-y := omap_drv.o \
 	omap_debugfs.o \
 	omap_crtc.o \
 	omap_plane.o \
+	omap_overlay.o \
 	omap_encoder.o \
 	omap_fb.o \
 	omap_gem.o \

drivers/gpu/drm/omapdrm/omap_drv.c

@@ -583,10 +583,14 @@ static int omapdrm_init(struct omap_drm_private *priv, struct device *dev)
 
 	omap_gem_init(ddev);
 
+	ret = omap_hwoverlays_init(priv);
+	if (ret)
+		goto err_gem_deinit;
+
 	ret = omap_modeset_init(ddev);
 	if (ret) {
 		dev_err(priv->dev, "omap_modeset_init failed: ret=%d\n", ret);
-		goto err_gem_deinit;
+		goto err_free_overlays;
 	}
 
 	/* Initialize vblank handling, start with all CRTCs disabled. */
@@ -618,6 +622,8 @@ static int omapdrm_init(struct omap_drm_private *priv, struct device *dev)
 	omap_fbdev_fini(ddev);
 err_cleanup_modeset:
 	omap_modeset_fini(ddev);
+err_free_overlays:
+	omap_hwoverlays_destroy(priv);
 err_gem_deinit:
 	omap_gem_deinit(ddev);
 	destroy_workqueue(priv->wq);
@@ -642,6 +648,7 @@ static void omapdrm_cleanup(struct omap_drm_private *priv)
 	drm_atomic_helper_shutdown(ddev);
 
 	omap_modeset_fini(ddev);
+	omap_hwoverlays_destroy(priv);
 	omap_gem_deinit(ddev);
 
 	destroy_workqueue(priv->wq);

drivers/gpu/drm/omapdrm/omap_drv.h

@@ -24,6 +24,7 @@
 #include "omap_gem.h"
 #include "omap_irq.h"
 #include "omap_plane.h"
+#include "omap_overlay.h"
 
 #define DBG(fmt, ...) DRM_DEBUG_DRIVER(fmt"\n", ##__VA_ARGS__)
 #define VERB(fmt, ...) if (0) DRM_DEBUG_DRIVER(fmt, ##__VA_ARGS__) /* verbose debug */
@@ -57,6 +58,9 @@ struct omap_drm_private {
 	unsigned int num_planes;
 	struct drm_plane *planes[8];
 
+	unsigned int num_ovls;
+	struct omap_hw_overlay *overlays[8];
+
 	struct drm_fb_helper *fbdev;
 
 	struct workqueue_struct *wq;

drivers/gpu/drm/omapdrm/omap_overlay.c

+// 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 <drm/drm_plane_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",
+};
+
+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;
+}

drivers/gpu/drm/omapdrm/omap_overlay.h

+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2018 Texas Instruments Incorporated -  http://www.ti.com/
+ * Author: Benoit Parrot <bparrot@ti.com>
+ */
+
+#ifndef __OMAPDRM_OVERLAY_H__
+#define __OMAPDRM_OVERLAY_H__
+
+#include <linux/types.h>
+
+enum drm_plane_type;
+
+struct drm_device;
+struct drm_mode_object;
+struct drm_plane;
+
+/* Used to associate a HW overlay/plane to a plane */
+struct omap_hw_overlay {
+	unsigned int idx;
+
+	const char *name;
+	enum omap_plane_id id;
+
+	enum omap_overlay_caps caps;
+};
+
+int omap_hwoverlays_init(struct omap_drm_private *priv);
+void omap_hwoverlays_destroy(struct omap_drm_private *priv);
+#endif /* __OMAPDRM_OVERLAY_H__ */

drivers/gpu/drm/omapdrm/omap_plane.c

@@ -21,7 +21,8 @@
 struct omap_plane {
 	struct drm_plane base;
 	enum omap_plane_id id;
-	const char *name;
+
+	struct omap_hw_overlay *overlay;
 };
 
 static int omap_plane_prepare_fb(struct drm_plane *plane,
@@ -49,10 +50,11 @@ static void omap_plane_atomic_update(struct drm_plane *plane,
 	struct omap_plane *omap_plane = to_omap_plane(plane);
 	struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
 									   plane);
+	enum omap_plane_id ovl_id = omap_plane->overlay->id;
 	struct omap_overlay_info info;
 	int ret;
 
-	DBG("%s, crtc=%p fb=%p", omap_plane->name, new_state->crtc,
+	DBG("%s, crtc=%p fb=%p", plane->name, new_state->crtc,
 	    new_state->fb);
 
 	memset(&info, 0, sizeof(info));
@@ -77,17 +79,17 @@ static void omap_plane_atomic_update(struct drm_plane *plane,
 			&info.paddr, &info.p_uv_addr);
 
 	/* and finally, update omapdss: */
-	ret = dispc_ovl_setup(priv->dispc, omap_plane->id, &info,
+	ret = dispc_ovl_setup(priv->dispc, ovl_id, &info,
 			      omap_crtc_timings(new_state->crtc), false,
 			      omap_crtc_channel(new_state->crtc));
 	if (ret) {
 		dev_err(plane->dev->dev, "Failed to setup plane %s\n",
-			omap_plane->name);
-		dispc_ovl_enable(priv->dispc, omap_plane->id, false);
+			plane->name);
+		dispc_ovl_enable(priv->dispc, ovl_id, false);
 		return;
 	}
 
-	dispc_ovl_enable(priv->dispc, omap_plane->id, true);
+	dispc_ovl_enable(priv->dispc, ovl_id, true);
 }
 
 static void omap_plane_atomic_disable(struct drm_plane *plane,
@@ -97,11 +99,12 @@ static void omap_plane_atomic_disable(struct drm_plane *plane,
 									   plane);
 	struct omap_drm_private *priv = plane->dev->dev_private;
 	struct omap_plane *omap_plane = to_omap_plane(plane);
+	enum omap_plane_id ovl_id = omap_plane->overlay->id;
 
 	new_state->rotation = DRM_MODE_ROTATE_0;
 	new_state->zpos = plane->type == DRM_PLANE_TYPE_PRIMARY ? 0 : omap_plane->id;
 
-	dispc_ovl_enable(priv->dispc, omap_plane->id, false);
+	dispc_ovl_enable(priv->dispc, ovl_id, false);
 }
 
 #define FRAC_16_16(mult, div)    (((mult) << 16) / (div))
@@ -184,7 +187,7 @@ static void omap_plane_destroy(struct drm_plane *plane)
 {
 	struct omap_plane *omap_plane = to_omap_plane(plane);
 
-	DBG("%s", omap_plane->name);
+	DBG("%s", plane->name);
 
 	drm_plane_cleanup(plane);
 
@@ -290,20 +293,6 @@ static bool omap_plane_supports_yuv(struct drm_plane *plane)
 	return false;
 }
 
-static const char *plane_id_to_name[] = {
-	[OMAP_DSS_GFX] = "gfx",
-	[OMAP_DSS_VIDEO1] = "vid1",
-	[OMAP_DSS_VIDEO2] = "vid2",
-	[OMAP_DSS_VIDEO3] = "vid3",
-};
-
-static const enum omap_plane_id plane_idx_to_id[] = {
-	OMAP_DSS_GFX,
-	OMAP_DSS_VIDEO1,
-	OMAP_DSS_VIDEO2,
-	OMAP_DSS_VIDEO3,
-};
-
 /* initialize plane */
 struct drm_plane *omap_plane_init(struct drm_device *dev,
 		int idx, enum drm_plane_type type,
@@ -313,27 +302,26 @@ struct drm_plane *omap_plane_init(struct drm_device *dev,
 	unsigned int num_planes = dispc_get_num_ovls(priv->dispc);
 	struct drm_plane *plane;
 	struct omap_plane *omap_plane;
-	enum omap_plane_id id;
 	int ret;
 	u32 nformats;
 	const u32 *formats;
 
-	if (WARN_ON(idx >= ARRAY_SIZE(plane_idx_to_id)))
+	if (WARN_ON(idx >= num_planes))
 		return ERR_PTR(-EINVAL);
 
-	id = plane_idx_to_id[idx];
-
-	DBG("%s: type=%d", plane_id_to_name[id], type);
-
 	omap_plane = kzalloc(sizeof(*omap_plane), GFP_KERNEL);
 	if (!omap_plane)
 		return ERR_PTR(-ENOMEM);
 
-	formats = dispc_ovl_get_color_modes(priv->dispc, id);
+	omap_plane->id = idx;
+	omap_plane->overlay = priv->overlays[idx];
+
+	DBG("%d: type=%d", omap_plane->id, type);
+	DBG("	crtc_mask: 0x%04x", possible_crtcs);
+
+	formats = dispc_ovl_get_color_modes(priv->dispc, omap_plane->overlay->id);
 	for (nformats = 0; formats[nformats]; ++nformats)
 		;
-	omap_plane->id = id;
-	omap_plane->name = plane_id_to_name[id];
 
 	plane = &omap_plane->base;
 
@@ -363,8 +351,8 @@ struct drm_plane *omap_plane_init(struct drm_device *dev,
 	return plane;
 
 error:
-	dev_err(dev->dev, "%s(): could not create plane: %s\n",
-		__func__, plane_id_to_name[id]);
+	dev_err(dev->dev, "%s(): could not create plane: %d\n",
+		__func__, omap_plane->id);
 
 	kfree(omap_plane);
 	return NULL;