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 #include <drm/drm_plane_helper.h>
  10
  11 #include "omap_dmm_tiler.h"
  12 #include "omap_drv.h"
  13
  14 /*
  15  * overlay funcs
  16  */
  17 static const char * const overlay_id_to_name[] = {
  18         [OMAP_DSS_GFX] = "gfx",
  19         [OMAP_DSS_VIDEO1] = "vid1",
  20         [OMAP_DSS_VIDEO2] = "vid2",
  21         [OMAP_DSS_VIDEO3] = "vid3",
  22 };
  23
  24 /*
  25  * Find a free overlay with the required caps and supported fourcc
  26  */
  27 static struct omap_hw_overlay *
  28 omap_plane_find_free_overlay(struct drm_device *dev, struct drm_plane *hwoverlay_to_plane[],
  29                              u32 caps, u32 fourcc)
  30 {
  31         struct omap_drm_private *priv = dev->dev_private;
  32         int i;
  33
  34         DBG("caps: %x fourcc: %x", caps, fourcc);
  35
  36         for (i = 0; i < priv->num_ovls; i++) {
  37                 struct omap_hw_overlay *cur = priv->overlays[i];
  38
  39                 DBG("%d: id: %d cur->caps: %x",
  40                     cur->idx, cur->id, cur->caps);
  41
  42                 /* skip if already in-use */
  43                 if (hwoverlay_to_plane[cur->idx])
  44                         continue;
  45
  46                 /* skip if doesn't support some required caps: */
  47                 if (caps & ~cur->caps)
  48                         continue;
  49
  50                 /* check supported format */
  51                 if (!dispc_ovl_color_mode_supported(priv->dispc,
  52                                                     cur->id, fourcc))
  53                         continue;
  54
  55                 return cur;
  56         }
  57
  58         DBG("no match");
  59         return NULL;
  60 }
  61
  62 /*
  63  * Assign a new overlay to a plane with the required caps and supported fourcc
  64  * If a plane need a new overlay, the previous one should have been released
  65  * with omap_overlay_release()
  66  * This should be called from the plane atomic_check() in order to prepare the
  67  * next global overlay_map to be enabled when atomic transaction is valid.
  68  */
  69 int omap_overlay_assign(struct drm_atomic_state *s, struct drm_plane *plane,
  70                         u32 caps, u32 fourcc, struct omap_hw_overlay **overlay,
  71                         struct omap_hw_overlay **r_overlay)
  72 {
  73         /* Get the global state of the current atomic transaction */
  74         struct omap_global_state *state = omap_get_global_state(s);
  75         struct drm_plane **overlay_map = state->hwoverlay_to_plane;
  76         struct omap_hw_overlay *ovl, *r_ovl;
  77
  78         ovl = omap_plane_find_free_overlay(s->dev, overlay_map, caps, fourcc);
  79         if (!ovl)
  80                 return -ENOMEM;
  81
  82         overlay_map[ovl->idx] = plane;
  83         *overlay = ovl;
  84
  85         if (r_overlay) {
  86                 r_ovl = omap_plane_find_free_overlay(s->dev, overlay_map,
  87                                                      caps, fourcc);
  88                 if (!r_ovl) {
  89                         overlay_map[r_ovl->idx] = NULL;
  90                         *overlay = NULL;
  91                         return -ENOMEM;
  92                 }
  93
  94                 overlay_map[r_ovl->idx] = plane;
  95                 *r_overlay = r_ovl;
  96         }
  97
  98         DBG("%s: assign to plane %s caps %x", ovl->name, plane->name, caps);
  99
 100         if (r_overlay) {
 101                 DBG("%s: assign to right of plane %s caps %x",
 102                     r_ovl->name, plane->name, caps);
 103         }
 104
 105         return 0;
 106 }
 107
 108 /*
 109  * Release an overlay from a plane if the plane gets not visible or the plane
 110  * need a new overlay if overlay caps changes.
 111  * This should be called from the plane atomic_check() in order to prepare the
 112  * next global overlay_map to be enabled when atomic transaction is valid.
 113  */
 114 void omap_overlay_release(struct drm_atomic_state *s, struct omap_hw_overlay *overlay)
 115 {
 116         /* Get the global state of the current atomic transaction */
 117         struct omap_global_state *state = omap_get_global_state(s);
 118         struct drm_plane **overlay_map = state->hwoverlay_to_plane;
 119
 120         if (!overlay)
 121                 return;
 122
 123         if (WARN_ON(!overlay_map[overlay->idx]))
 124                 return;
 125
 126         DBG("%s: release from plane %s", overlay->name, overlay_map[overlay->idx]->name);
 127
 128         overlay_map[overlay->idx] = NULL;
 129 }
 130
 131 /*
 132  * Update an overlay state that was attached to a plane before the current atomic state.
 133  * This should be called from the plane atomic_update() or atomic_disable(),
 134  * where an overlay association to a plane could have changed between the old and current
 135  * atomic state.
 136  */
 137 void omap_overlay_update_state(struct omap_drm_private *priv,
 138                                struct omap_hw_overlay *overlay)
 139 {
 140         struct omap_global_state *state = omap_get_existing_global_state(priv);
 141         struct drm_plane **overlay_map = state->hwoverlay_to_plane;
 142
 143         /* Check if this overlay is not used anymore, then disable it */
 144         if (!overlay_map[overlay->idx]) {
 145                 DBG("%s: disabled", overlay->name);
 146
 147                 /* disable the overlay */
 148                 dispc_ovl_enable(priv->dispc, overlay->id, false);
 149         }
 150 }
 151
 152 static void omap_overlay_destroy(struct omap_hw_overlay *overlay)
 153 {
 154         kfree(overlay);
 155 }
 156
 157 static struct omap_hw_overlay *omap_overlay_init(enum omap_plane_id overlay_id,
 158                                                  enum omap_overlay_caps caps)
 159 {
 160         struct omap_hw_overlay *overlay;
 161
 162         overlay = kzalloc(sizeof(*overlay), GFP_KERNEL);
 163         if (!overlay)
 164                 return ERR_PTR(-ENOMEM);
 165
 166         overlay->name = overlay_id_to_name[overlay_id];
 167         overlay->id = overlay_id;
 168         overlay->caps = caps;
 169
 170         return overlay;
 171 }
 172
 173 int omap_hwoverlays_init(struct omap_drm_private *priv)
 174 {
 175         static const enum omap_plane_id hw_plane_ids[] = {
 176                         OMAP_DSS_GFX, OMAP_DSS_VIDEO1,
 177                         OMAP_DSS_VIDEO2, OMAP_DSS_VIDEO3,
 178         };
 179         u32 num_overlays = dispc_get_num_ovls(priv->dispc);
 180         enum omap_overlay_caps caps;
 181         int i, ret;
 182
 183         for (i = 0; i < num_overlays; i++) {
 184                 struct omap_hw_overlay *overlay;
 185
 186                 caps = dispc_ovl_get_caps(priv->dispc, hw_plane_ids[i]);
 187                 overlay = omap_overlay_init(hw_plane_ids[i], caps);
 188                 if (IS_ERR(overlay)) {
 189                         ret = PTR_ERR(overlay);
 190                         dev_err(priv->dev, "failed to construct overlay for %s (%d)\n",
 191                                 overlay_id_to_name[i], ret);
 192                         omap_hwoverlays_destroy(priv);
 193                         return ret;
 194                 }
 195                 overlay->idx = priv->num_ovls;
 196                 priv->overlays[priv->num_ovls++] = overlay;
 197         }
 198
 199         return 0;
 200 }
 201
 202 void omap_hwoverlays_destroy(struct omap_drm_private *priv)
 203 {
 204         int i;
 205
 206         for (i = 0; i < priv->num_ovls; i++) {
 207                 omap_overlay_destroy(priv->overlays[i]);
 208                 priv->overlays[i] = NULL;
 209         }
 210
 211         priv->num_ovls = 0;
 212 }