drivers/gpu/drm/exynos/exynos_drm_plane.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2011 Samsung Electronics Co.Ltd
   4  * Authors: Joonyoung Shim <jy0922.shim@samsung.com>
   5  */
   6
   7
   8 #include <drm/drm_atomic.h>
   9 #include <drm/drm_atomic_helper.h>
  10 #include <drm/drm_blend.h>
  11 #include <drm/drm_framebuffer.h>
  12 #include <drm/exynos_drm.h>
  13
  14 #include "exynos_drm_crtc.h"
  15 #include "exynos_drm_drv.h"
  16 #include "exynos_drm_fb.h"
  17 #include "exynos_drm_gem.h"
  18 #include "exynos_drm_plane.h"
  19
  20 /*
  21  * This function is to get X or Y size shown via screen. This needs length and
  22  * start position of CRTC.
  23  *
  24  *      <--- length --->
  25  * CRTC ----------------
  26  *      ^ start        ^ end
  27  *
  28  * There are six cases from a to f.
  29  *
  30  *             <----- SCREEN ----->
  31  *             0                 last
  32  *   ----------|------------------|----------
  33  * CRTCs
  34  * a -------
  35  *        b -------
  36  *        c --------------------------
  37  *                 d --------
  38  *                           e -------
  39  *                                  f -------
  40  */
  41 static int exynos_plane_get_size(int start, unsigned length, unsigned last)
  42 {
  43         int end = start + length;
  44         int size = 0;
  45
  46         if (start <= 0) {
  47                 if (end > 0)
  48                         size = min_t(unsigned, end, last);
  49         } else if (start <= last) {
  50                 size = min_t(unsigned, last - start, length);
  51         }
  52
  53         return size;
  54 }
  55
  56 static void exynos_plane_mode_set(struct exynos_drm_plane_state *exynos_state)
  57 {
  58         struct drm_plane_state *state = &exynos_state->base;
  59         struct drm_crtc *crtc = state->crtc;
  60         struct drm_crtc_state *crtc_state =
  61                         drm_atomic_get_existing_crtc_state(state->state, crtc);
  62         struct drm_display_mode *mode = &crtc_state->adjusted_mode;
  63         int crtc_x, crtc_y;
  64         unsigned int crtc_w, crtc_h;
  65         unsigned int src_x, src_y;
  66         unsigned int src_w, src_h;
  67         unsigned int actual_w;
  68         unsigned int actual_h;
  69
  70         /*
  71          * The original src/dest coordinates are stored in exynos_state->base,
  72          * but we want to keep another copy internal to our driver that we can
  73          * clip/modify ourselves.
  74          */
  75
  76         crtc_x = state->crtc_x;
  77         crtc_y = state->crtc_y;
  78         crtc_w = state->crtc_w;
  79         crtc_h = state->crtc_h;
  80
  81         src_x = state->src_x >> 16;
  82         src_y = state->src_y >> 16;
  83         src_w = state->src_w >> 16;
  84         src_h = state->src_h >> 16;
  85
  86         /* set ratio */
  87         exynos_state->h_ratio = (src_w << 16) / crtc_w;
  88         exynos_state->v_ratio = (src_h << 16) / crtc_h;
  89
  90         /* clip to visible area */
  91         actual_w = exynos_plane_get_size(crtc_x, crtc_w, mode->hdisplay);
  92         actual_h = exynos_plane_get_size(crtc_y, crtc_h, mode->vdisplay);
  93
  94         if (crtc_x < 0) {
  95                 if (actual_w)
  96                         src_x += ((-crtc_x) * exynos_state->h_ratio) >> 16;
  97                 crtc_x = 0;
  98         }
  99
 100         if (crtc_y < 0) {
 101                 if (actual_h)
 102                         src_y += ((-crtc_y) * exynos_state->v_ratio) >> 16;
 103                 crtc_y = 0;
 104         }
 105
 106         /* set drm framebuffer data. */
 107         exynos_state->src.x = src_x;
 108         exynos_state->src.y = src_y;
 109         exynos_state->src.w = (actual_w * exynos_state->h_ratio) >> 16;
 110         exynos_state->src.h = (actual_h * exynos_state->v_ratio) >> 16;
 111
 112         /* set plane range to be displayed. */
 113         exynos_state->crtc.x = crtc_x;
 114         exynos_state->crtc.y = crtc_y;
 115         exynos_state->crtc.w = actual_w;
 116         exynos_state->crtc.h = actual_h;
 117
 118         DRM_DEV_DEBUG_KMS(crtc->dev->dev,
 119                           "plane : offset_x/y(%d,%d), width/height(%d,%d)",
 120                           exynos_state->crtc.x, exynos_state->crtc.y,
 121                           exynos_state->crtc.w, exynos_state->crtc.h);
 122 }
 123
 124 static void exynos_drm_plane_reset(struct drm_plane *plane)
 125 {
 126         struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
 127         struct exynos_drm_plane_state *exynos_state;
 128
 129         if (plane->state) {
 130                 exynos_state = to_exynos_plane_state(plane->state);
 131                 __drm_atomic_helper_plane_destroy_state(plane->state);
 132                 kfree(exynos_state);
 133                 plane->state = NULL;
 134         }
 135
 136         exynos_state = kzalloc(sizeof(*exynos_state), GFP_KERNEL);
 137         if (exynos_state) {
 138                 __drm_atomic_helper_plane_reset(plane, &exynos_state->base);
 139                 plane->state->zpos = exynos_plane->config->zpos;
 140         }
 141 }
 142
 143 static struct drm_plane_state *
 144 exynos_drm_plane_duplicate_state(struct drm_plane *plane)
 145 {
 146         struct exynos_drm_plane_state *exynos_state;
 147         struct exynos_drm_plane_state *copy;
 148
 149         exynos_state = to_exynos_plane_state(plane->state);
 150         copy = kzalloc(sizeof(*exynos_state), GFP_KERNEL);
 151         if (!copy)
 152                 return NULL;
 153
 154         __drm_atomic_helper_plane_duplicate_state(plane, &copy->base);
 155         return &copy->base;
 156 }
 157
 158 static void exynos_drm_plane_destroy_state(struct drm_plane *plane,
 159                                            struct drm_plane_state *old_state)
 160 {
 161         struct exynos_drm_plane_state *old_exynos_state =
 162                                         to_exynos_plane_state(old_state);
 163         __drm_atomic_helper_plane_destroy_state(old_state);
 164         kfree(old_exynos_state);
 165 }
 166
 167 static struct drm_plane_funcs exynos_plane_funcs = {
 168         .update_plane   = drm_atomic_helper_update_plane,
 169         .disable_plane  = drm_atomic_helper_disable_plane,
 170         .destroy        = drm_plane_cleanup,
 171         .reset          = exynos_drm_plane_reset,
 172         .atomic_duplicate_state = exynos_drm_plane_duplicate_state,
 173         .atomic_destroy_state = exynos_drm_plane_destroy_state,
 174 };
 175
 176 static int
 177 exynos_drm_plane_check_format(const struct exynos_drm_plane_config *config,
 178                               struct exynos_drm_plane_state *state)
 179 {
 180         struct drm_framebuffer *fb = state->base.fb;
 181         struct drm_device *dev = fb->dev;
 182
 183         switch (fb->modifier) {
 184         case DRM_FORMAT_MOD_SAMSUNG_64_32_TILE:
 185                 if (!(config->capabilities & EXYNOS_DRM_PLANE_CAP_TILE))
 186                         return -ENOTSUPP;
 187                 break;
 188
 189         case DRM_FORMAT_MOD_LINEAR:
 190                 break;
 191
 192         default:
 193                 DRM_DEV_ERROR(dev->dev, "unsupported pixel format modifier");
 194                 return -ENOTSUPP;
 195         }
 196
 197         return 0;
 198 }
 199
 200 static int
 201 exynos_drm_plane_check_size(const struct exynos_drm_plane_config *config,
 202                             struct exynos_drm_plane_state *state)
 203 {
 204         struct drm_crtc *crtc = state->base.crtc;
 205         bool width_ok = false, height_ok = false;
 206
 207         if (config->capabilities & EXYNOS_DRM_PLANE_CAP_SCALE)
 208                 return 0;
 209
 210         if (state->src.w == state->crtc.w)
 211                 width_ok = true;
 212
 213         if (state->src.h == state->crtc.h)
 214                 height_ok = true;
 215
 216         if ((config->capabilities & EXYNOS_DRM_PLANE_CAP_DOUBLE) &&
 217             state->h_ratio == (1 << 15))
 218                 width_ok = true;
 219
 220         if ((config->capabilities & EXYNOS_DRM_PLANE_CAP_DOUBLE) &&
 221             state->v_ratio == (1 << 15))
 222                 height_ok = true;
 223
 224         if (width_ok && height_ok)
 225                 return 0;
 226
 227         DRM_DEV_DEBUG_KMS(crtc->dev->dev, "scaling mode is not supported");
 228         return -ENOTSUPP;
 229 }
 230
 231 static int exynos_plane_atomic_check(struct drm_plane *plane,
 232                                      struct drm_atomic_state *state)
 233 {
 234         struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state,
 235                                                                                  plane);
 236         struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
 237         struct exynos_drm_plane_state *exynos_state =
 238                                                 to_exynos_plane_state(new_plane_state);
 239         int ret = 0;
 240
 241         if (!new_plane_state->crtc || !new_plane_state->fb)
 242                 return 0;
 243
 244         /* translate state into exynos_state */
 245         exynos_plane_mode_set(exynos_state);
 246
 247         ret = exynos_drm_plane_check_format(exynos_plane->config, exynos_state);
 248         if (ret)
 249                 return ret;
 250
 251         ret = exynos_drm_plane_check_size(exynos_plane->config, exynos_state);
 252         return ret;
 253 }
 254
 255 static void exynos_plane_atomic_update(struct drm_plane *plane,
 256                                        struct drm_atomic_state *state)
 257 {
 258         struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
 259                                                                            plane);
 260         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(new_state->crtc);
 261         struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
 262
 263         if (!new_state->crtc)
 264                 return;
 265
 266         if (exynos_crtc->ops->update_plane)
 267                 exynos_crtc->ops->update_plane(exynos_crtc, exynos_plane);
 268 }
 269
 270 static void exynos_plane_atomic_disable(struct drm_plane *plane,
 271                                         struct drm_atomic_state *state)
 272 {
 273         struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(state, plane);
 274         struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
 275         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(old_state->crtc);
 276
 277         if (!old_state->crtc)
 278                 return;
 279
 280         if (exynos_crtc->ops->disable_plane)
 281                 exynos_crtc->ops->disable_plane(exynos_crtc, exynos_plane);
 282 }
 283
 284 static const struct drm_plane_helper_funcs plane_helper_funcs = {
 285         .atomic_check = exynos_plane_atomic_check,
 286         .atomic_update = exynos_plane_atomic_update,
 287         .atomic_disable = exynos_plane_atomic_disable,
 288 };
 289
 290 static void exynos_plane_attach_zpos_property(struct drm_plane *plane,
 291                                               int zpos, bool immutable)
 292 {
 293         if (immutable)
 294                 drm_plane_create_zpos_immutable_property(plane, zpos);
 295         else
 296                 drm_plane_create_zpos_property(plane, zpos, 0, MAX_PLANE - 1);
 297 }
 298
 299 int exynos_plane_init(struct drm_device *dev,
 300                       struct exynos_drm_plane *exynos_plane, unsigned int index,
 301                       const struct exynos_drm_plane_config *config)
 302 {
 303         int err;
 304         unsigned int supported_modes = BIT(DRM_MODE_BLEND_PIXEL_NONE) |
 305                                        BIT(DRM_MODE_BLEND_PREMULTI) |
 306                                        BIT(DRM_MODE_BLEND_COVERAGE);
 307         struct drm_plane *plane = &exynos_plane->base;
 308
 309         err = drm_universal_plane_init(dev, &exynos_plane->base,
 310                                        1 << dev->mode_config.num_crtc,
 311                                        &exynos_plane_funcs,
 312                                        config->pixel_formats,
 313                                        config->num_pixel_formats,
 314                                        NULL, config->type, NULL);
 315         if (err) {
 316                 DRM_DEV_ERROR(dev->dev, "failed to initialize plane\n");
 317                 return err;
 318         }
 319
 320         drm_plane_helper_add(&exynos_plane->base, &plane_helper_funcs);
 321
 322         exynos_plane->index = index;
 323         exynos_plane->config = config;
 324
 325         exynos_plane_attach_zpos_property(&exynos_plane->base, config->zpos,
 326                            !(config->capabilities & EXYNOS_DRM_PLANE_CAP_ZPOS));
 327
 328         if (config->capabilities & EXYNOS_DRM_PLANE_CAP_PIX_BLEND)
 329                 drm_plane_create_blend_mode_property(plane, supported_modes);
 330
 331         if (config->capabilities & EXYNOS_DRM_PLANE_CAP_WIN_BLEND)
 332                 drm_plane_create_alpha_property(plane);
 333
 334         return 0;
 335 }