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