drivers/gpu/drm/omapdrm/omap_overlay.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2018 Texas Instruments Incorporated -  http://www.ti.com/
   4  * Author: Benoit Parrot <[email protected]>
   5  */
   6
   7 #include <drm/drm_atomic.h>
   8 #include <drm/drm_atomic_helper.h>
   9
  10 #include "omap_dmm_tiler.h"
  11 #include "omap_drv.h"
  12
  13 /*
  14  * overlay funcs
  15  */
  16 static const char * const overlay_id_to_name[] = {
  17         [OMAP_DSS_GFX] = "gfx",
  18         [OMAP_DSS_VIDEO1] = "vid1",
  19         [OMAP_DSS_VIDEO2] = "vid2",
  20         [OMAP_DSS_VIDEO3] = "vid3",
  21 };
  22
  23 /*
  24  * Find a free overlay with the required caps and supported fourcc
  25  */
  26 static struct omap_hw_overlay *
  27 omap_plane_find_free_overlay(struct drm_device *dev, struct drm_plane *hwoverlay_to_plane[],
  28                              u32 caps, u32 fourcc)
  29 {
  30         struct omap_drm_private *priv = dev->dev_private;
  31         int i;
  32
  33         DBG("caps: %x fourcc: %x", caps, fourcc);
  34
  35         for (i = 0; i < priv->num_ovls; i++) {
  36                 struct omap_hw_overlay *cur = priv->overlays[i];
  37
  38                 DBG("%d: id: %d cur->caps: %x",
  39                     cur->idx, cur->id, cur->caps);
  40
  41                 /* skip if already in-use */
  42                 if (hwoverlay_to_plane[cur->idx])
  43                         continue;
  44
  45                 /* skip if doesn't support some required caps: */
  46                 if (caps & ~cur->caps)
  47                         continue;
  48
  49                 /* check supported format */
  50                 if (!dispc_ovl_color_mode_supported(priv->dispc,
  51                                                     cur->id, fourcc))
  52                         continue;
  53
  54                 return cur;
  55         }
  56
  57         DBG("no match");
  58         return NULL;
  59 }
  60
  61 /*
  62  * Assign a new overlay to a plane with the required caps and supported fourcc
  63  * If a plane need a new overlay, the previous one should have been released
  64  * with omap_overlay_release()
  65  * This should be called from the plane atomic_check() in order to prepare the
  66  * next global overlay_map to be enabled when atomic transaction is valid.
  67  */
  68 int omap_overlay_assign(struct drm_atomic_state *s, struct drm_plane *plane,
  69                         u32 caps, u32 fourcc, struct omap_hw_overlay **overlay,
  70                         struct omap_hw_overlay **r_overlay)
  71 {
  72         /* Get the global state of the current atomic transaction */
  73         struct omap_global_state *state = omap_get_global_state(s);
  74         struct drm_plane **overlay_map = state->hwoverlay_to_plane;
  75         struct omap_hw_overlay *ovl, *r_ovl;
  76
  77         ovl = omap_plane_find_free_overlay(s->dev, overlay_map, caps, fourcc);
  78         if (!ovl)
  79                 return -ENOMEM;
  80
  81         overlay_map[ovl->idx] = plane;
  82         *overlay = ovl;
  83
  84         if (r_overlay) {
  85                 r_ovl = omap_plane_find_free_overlay(s->dev, overlay_map,
  86                                                      caps, fourcc);
  87                 if (!r_ovl) {
  88                         overlay_map[ovl->idx] = NULL;
  89                         *overlay = NULL;
  90                         return -ENOMEM;
  91                 }
  92
  93                 overlay_map[r_ovl->idx] = plane;
  94                 *r_overlay = r_ovl;
  95         }
  96
  97         DBG("%s: assign to plane %s caps %x", ovl->name, plane->name, caps);
  98
  99         if (r_overlay) {
 100                 DBG("%s: assign to right of plane %s caps %x",
 101                     r_ovl->name, plane->name, caps);
 102         }
 103
 104         return 0;
 105 }
 106
 107 /*
 108  * Release an overlay from a plane if the plane gets not visible or the plane
 109  * need a new overlay if overlay caps changes.
 110  * This should be called from the plane atomic_check() in order to prepare the
 111  * next global overlay_map to be enabled when atomic transaction is valid.
 112  */
 113 void omap_overlay_release(struct drm_atomic_state *s, struct omap_hw_overlay *overlay)
 114 {
 115         /* Get the global state of the current atomic transaction */
 116         struct omap_global_state *state = omap_get_global_state(s);
 117         struct drm_plane **overlay_map = state->hwoverlay_to_plane;
 118
 119         if (!overlay)
 120                 return;
 121
 122         if (WARN_ON(!overlay_map[overlay->idx]))
 123                 return;
 124
 125         DBG("%s: release from plane %s", overlay->name, overlay_map[overlay->idx]->name);
 126
 127         overlay_map[overlay->idx] = NULL;
 128 }
 129
 130 /*
 131  * Update an overlay state that was attached to a plane before the current atomic state.
 132  * This should be called from the plane atomic_update() or atomic_disable(),
 133  * where an overlay association to a plane could have changed between the old and current
 134  * atomic state.
 135  */
 136 void omap_overlay_update_state(struct omap_drm_private *priv,
 137                                struct omap_hw_overlay *overlay)
 138 {
 139         struct omap_global_state *state = omap_get_existing_global_state(priv);
 140         struct drm_plane **overlay_map = state->hwoverlay_to_plane;
 141
 142         /* Check if this overlay is not used anymore, then disable it */
 143         if (!overlay_map[overlay->idx]) {
 144                 DBG("%s: disabled", overlay->name);
 145
 146                 /* disable the overlay */
 147                 dispc_ovl_enable(priv->dispc, overlay->id, false);
 148         }
 149 }
 150
 151 static void omap_overlay_destroy(struct omap_hw_overlay *overlay)
 152 {
 153         kfree(overlay);
 154 }
 155
 156 static struct omap_hw_overlay *omap_overlay_init(enum omap_plane_id overlay_id,
 157                                                  enum omap_overlay_caps caps)
 158 {
 159         struct omap_hw_overlay *overlay;
 160
 161         overlay = kzalloc(sizeof(*overlay), GFP_KERNEL);
 162         if (!overlay)
 163                 return ERR_PTR(-ENOMEM);
 164
 165         overlay->name = overlay_id_to_name[overlay_id];
 166         overlay->id = overlay_id;
 167         overlay->caps = caps;
 168
 169         return overlay;
 170 }
 171
 172 int omap_hwoverlays_init(struct omap_drm_private *priv)
 173 {
 174         static const enum omap_plane_id hw_plane_ids[] = {
 175                         OMAP_DSS_GFX, OMAP_DSS_VIDEO1,
 176                         OMAP_DSS_VIDEO2, OMAP_DSS_VIDEO3,
 177         };
 178         u32 num_overlays = dispc_get_num_ovls(priv->dispc);
 179         enum omap_overlay_caps caps;
 180         int i, ret;
 181
 182         for (i = 0; i < num_overlays; i++) {
 183                 struct omap_hw_overlay *overlay;
 184
 185                 caps = dispc_ovl_get_caps(priv->dispc, hw_plane_ids[i]);
 186                 overlay = omap_overlay_init(hw_plane_ids[i], caps);
 187                 if (IS_ERR(overlay)) {
 188                         ret = PTR_ERR(overlay);
 189                         dev_err(priv->dev, "failed to construct overlay for %s (%d)\n",
 190                                 overlay_id_to_name[i], ret);
 191                         omap_hwoverlays_destroy(priv);
 192                         return ret;
 193                 }
 194                 overlay->idx = priv->num_ovls;
 195                 priv->overlays[priv->num_ovls++] = overlay;
 196         }
 197
 198         return 0;
 199 }
 200
 201 void omap_hwoverlays_destroy(struct omap_drm_private *priv)
 202 {
 203         int i;
 204
 205         for (i = 0; i < priv->num_ovls; i++) {
 206                 omap_overlay_destroy(priv->overlays[i]);
 207                 priv->overlays[i] = NULL;
 208         }
 209
 210         priv->num_ovls = 0;
 211 }