drivers/gpu/drm/exynos/exynos_drm_plane.c

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