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_unreference(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         .set_property   = drm_atomic_helper_plane_set_property,
 177         .reset          = exynos_drm_plane_reset,
 178         .atomic_duplicate_state = exynos_drm_plane_duplicate_state,
 179         .atomic_destroy_state = exynos_drm_plane_destroy_state,
 180 };
 181
 182 static int
 183 exynos_drm_plane_check_size(const struct exynos_drm_plane_config *config,
 184                             struct exynos_drm_plane_state *state)
 185 {
 186         bool width_ok = false, height_ok = false;
 187
 188         if (config->capabilities & EXYNOS_DRM_PLANE_CAP_SCALE)
 189                 return 0;
 190
 191         if (state->src.w == state->crtc.w)
 192                 width_ok = true;
 193
 194         if (state->src.h == state->crtc.h)
 195                 height_ok = true;
 196
 197         if ((config->capabilities & EXYNOS_DRM_PLANE_CAP_DOUBLE) &&
 198             state->h_ratio == (1 << 15))
 199                 width_ok = true;
 200
 201         if ((config->capabilities & EXYNOS_DRM_PLANE_CAP_DOUBLE) &&
 202             state->v_ratio == (1 << 15))
 203                 height_ok = true;
 204
 205         if (width_ok && height_ok)
 206                 return 0;
 207
 208         DRM_DEBUG_KMS("scaling mode is not supported");
 209         return -ENOTSUPP;
 210 }
 211
 212 static int exynos_plane_atomic_check(struct drm_plane *plane,
 213                                      struct drm_plane_state *state)
 214 {
 215         struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
 216         struct exynos_drm_plane_state *exynos_state =
 217                                                 to_exynos_plane_state(state);
 218         int ret = 0;
 219
 220         if (!state->crtc || !state->fb)
 221                 return 0;
 222
 223         /* translate state into exynos_state */
 224         exynos_plane_mode_set(exynos_state);
 225
 226         ret = exynos_drm_plane_check_size(exynos_plane->config, exynos_state);
 227         return ret;
 228 }
 229
 230 static void exynos_plane_atomic_update(struct drm_plane *plane,
 231                                        struct drm_plane_state *old_state)
 232 {
 233         struct drm_plane_state *state = plane->state;
 234         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(state->crtc);
 235         struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
 236
 237         if (!state->crtc)
 238                 return;
 239
 240         plane->crtc = state->crtc;
 241
 242         if (exynos_crtc->ops->update_plane)
 243                 exynos_crtc->ops->update_plane(exynos_crtc, exynos_plane);
 244 }
 245
 246 static void exynos_plane_atomic_disable(struct drm_plane *plane,
 247                                         struct drm_plane_state *old_state)
 248 {
 249         struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
 250         struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(old_state->crtc);
 251
 252         if (!old_state->crtc)
 253                 return;
 254
 255         if (exynos_crtc->ops->disable_plane)
 256                 exynos_crtc->ops->disable_plane(exynos_crtc, exynos_plane);
 257 }
 258
 259 static const struct drm_plane_helper_funcs plane_helper_funcs = {
 260         .atomic_check = exynos_plane_atomic_check,
 261         .atomic_update = exynos_plane_atomic_update,
 262         .atomic_disable = exynos_plane_atomic_disable,
 263 };
 264
 265 static void exynos_plane_attach_zpos_property(struct drm_plane *plane,
 266                                               bool immutable)
 267 {
 268         /* FIXME */
 269         if (immutable)
 270                 drm_plane_create_zpos_immutable_property(plane, 0);
 271         else
 272                 drm_plane_create_zpos_property(plane, 0, 0, MAX_PLANE - 1);
 273 }
 274
 275 int exynos_plane_init(struct drm_device *dev,
 276                       struct exynos_drm_plane *exynos_plane,
 277                       unsigned int index, unsigned long possible_crtcs,
 278                       const struct exynos_drm_plane_config *config)
 279 {
 280         int err;
 281
 282         err = drm_universal_plane_init(dev, &exynos_plane->base,
 283                                        possible_crtcs,
 284                                        &exynos_plane_funcs,
 285                                        config->pixel_formats,
 286                                        config->num_pixel_formats,
 287                                        config->type, NULL);
 288         if (err) {
 289                 DRM_ERROR("failed to initialize plane\n");
 290                 return err;
 291         }
 292
 293         drm_plane_helper_add(&exynos_plane->base, &plane_helper_funcs);
 294
 295         exynos_plane->index = index;
 296         exynos_plane->config = config;
 297
 298         exynos_plane_attach_zpos_property(&exynos_plane->base,
 299                            !(config->capabilities & EXYNOS_DRM_PLANE_CAP_ZPOS));
 300
 301         return 0;
 302 }