linux/drivers/gpu/drm/exynos/exynos_drm_plane.c
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   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 */
  40static 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
  55static 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
 123static 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
 142static struct drm_plane_state *
 143exynos_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
 157static 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
 166static 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
 175static int
 176exynos_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
 199static int
 200exynos_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
 230static int exynos_plane_atomic_check(struct drm_plane *plane,
 231                                     struct drm_atomic_state *state)
 232{
 233        struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state,
 234                                                                                 plane);
 235        struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
 236        struct exynos_drm_plane_state *exynos_state =
 237                                                to_exynos_plane_state(new_plane_state);
 238        int ret = 0;
 239
 240        if (!new_plane_state->crtc || !new_plane_state->fb)
 241                return 0;
 242
 243        /* translate state into exynos_state */
 244        exynos_plane_mode_set(exynos_state);
 245
 246        ret = exynos_drm_plane_check_format(exynos_plane->config, exynos_state);
 247        if (ret)
 248                return ret;
 249
 250        ret = exynos_drm_plane_check_size(exynos_plane->config, exynos_state);
 251        return ret;
 252}
 253
 254static void exynos_plane_atomic_update(struct drm_plane *plane,
 255                                       struct drm_atomic_state *state)
 256{
 257        struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
 258                                                                           plane);
 259        struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(new_state->crtc);
 260        struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
 261
 262        if (!new_state->crtc)
 263                return;
 264
 265        if (exynos_crtc->ops->update_plane)
 266                exynos_crtc->ops->update_plane(exynos_crtc, exynos_plane);
 267}
 268
 269static void exynos_plane_atomic_disable(struct drm_plane *plane,
 270                                        struct drm_atomic_state *state)
 271{
 272        struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(state, plane);
 273        struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
 274        struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(old_state->crtc);
 275
 276        if (!old_state->crtc)
 277                return;
 278
 279        if (exynos_crtc->ops->disable_plane)
 280                exynos_crtc->ops->disable_plane(exynos_crtc, exynos_plane);
 281}
 282
 283static const struct drm_plane_helper_funcs plane_helper_funcs = {
 284        .atomic_check = exynos_plane_atomic_check,
 285        .atomic_update = exynos_plane_atomic_update,
 286        .atomic_disable = exynos_plane_atomic_disable,
 287};
 288
 289static void exynos_plane_attach_zpos_property(struct drm_plane *plane,
 290                                              int zpos, bool immutable)
 291{
 292        if (immutable)
 293                drm_plane_create_zpos_immutable_property(plane, zpos);
 294        else
 295                drm_plane_create_zpos_property(plane, zpos, 0, MAX_PLANE - 1);
 296}
 297
 298int exynos_plane_init(struct drm_device *dev,
 299                      struct exynos_drm_plane *exynos_plane, unsigned int index,
 300                      const struct exynos_drm_plane_config *config)
 301{
 302        int err;
 303        unsigned int supported_modes = BIT(DRM_MODE_BLEND_PIXEL_NONE) |
 304                                       BIT(DRM_MODE_BLEND_PREMULTI) |
 305                                       BIT(DRM_MODE_BLEND_COVERAGE);
 306        struct drm_plane *plane = &exynos_plane->base;
 307
 308        err = drm_universal_plane_init(dev, &exynos_plane->base,
 309                                       1 << dev->mode_config.num_crtc,
 310                                       &exynos_plane_funcs,
 311                                       config->pixel_formats,
 312                                       config->num_pixel_formats,
 313                                       NULL, config->type, NULL);
 314        if (err) {
 315                DRM_DEV_ERROR(dev->dev, "failed to initialize plane\n");
 316                return err;
 317        }
 318
 319        drm_plane_helper_add(&exynos_plane->base, &plane_helper_funcs);
 320
 321        exynos_plane->index = index;
 322        exynos_plane->config = config;
 323
 324        exynos_plane_attach_zpos_property(&exynos_plane->base, config->zpos,
 325                           !(config->capabilities & EXYNOS_DRM_PLANE_CAP_ZPOS));
 326
 327        if (config->capabilities & EXYNOS_DRM_PLANE_CAP_PIX_BLEND)
 328                drm_plane_create_blend_mode_property(plane, supported_modes);
 329
 330        if (config->capabilities & EXYNOS_DRM_PLANE_CAP_WIN_BLEND)
 331                drm_plane_create_alpha_property(plane);
 332
 333        return 0;
 334}
 335