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